112eb90f1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2f7018c21STomi Valkeinen /* 3f7018c21STomi Valkeinen * udlfb.c -- Framebuffer driver for DisplayLink USB controller 4f7018c21STomi Valkeinen * 5f7018c21STomi Valkeinen * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> 6f7018c21STomi Valkeinen * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> 7f7018c21STomi Valkeinen * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> 8f7018c21STomi Valkeinen * 9f7018c21STomi Valkeinen * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, 10f7018c21STomi Valkeinen * usb-skeleton by GregKH. 11f7018c21STomi Valkeinen * 12f7018c21STomi Valkeinen * Device-specific portions based on information from Displaylink, with work 13f7018c21STomi Valkeinen * from Florian Echtler, Henrik Bjerregaard Pedersen, and others. 14f7018c21STomi Valkeinen */ 15f7018c21STomi Valkeinen 16f7018c21STomi Valkeinen #include <linux/module.h> 17f7018c21STomi Valkeinen #include <linux/kernel.h> 18f7018c21STomi Valkeinen #include <linux/init.h> 19f7018c21STomi Valkeinen #include <linux/usb.h> 20f7018c21STomi Valkeinen #include <linux/uaccess.h> 21f7018c21STomi Valkeinen #include <linux/mm.h> 22f7018c21STomi Valkeinen #include <linux/fb.h> 23f7018c21STomi Valkeinen #include <linux/vmalloc.h> 24f7018c21STomi Valkeinen #include <linux/slab.h> 25f7018c21STomi Valkeinen #include <linux/delay.h> 264e705e17SMikulas Patocka #include <asm/unaligned.h> 27f7018c21STomi Valkeinen #include <video/udlfb.h> 28f7018c21STomi Valkeinen #include "edid.h" 29f7018c21STomi Valkeinen 30ed9de4edSAlan Stern #define OUT_EP_NUM 1 /* The endpoint number we will use */ 31ed9de4edSAlan Stern 32fa738a5cSLadislav Michl static const struct fb_fix_screeninfo dlfb_fix = { 33f7018c21STomi Valkeinen .id = "udlfb", 34f7018c21STomi Valkeinen .type = FB_TYPE_PACKED_PIXELS, 35f7018c21STomi Valkeinen .visual = FB_VISUAL_TRUECOLOR, 36f7018c21STomi Valkeinen .xpanstep = 0, 37f7018c21STomi Valkeinen .ypanstep = 0, 38f7018c21STomi Valkeinen .ywrapstep = 0, 39f7018c21STomi Valkeinen .accel = FB_ACCEL_NONE, 40f7018c21STomi Valkeinen }; 41f7018c21STomi Valkeinen 42f7018c21STomi Valkeinen static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | 43f7018c21STomi Valkeinen FBINFO_VIRTFB | 44f7018c21STomi Valkeinen FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | 45f7018c21STomi Valkeinen FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; 46f7018c21STomi Valkeinen 47f7018c21STomi Valkeinen /* 48f7018c21STomi Valkeinen * There are many DisplayLink-based graphics products, all with unique PIDs. 49f7018c21STomi Valkeinen * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 50f7018c21STomi Valkeinen * We also require a match on SubClass (0x00) and Protocol (0x00), 51f7018c21STomi Valkeinen * which is compatible with all known USB 2.0 era graphics chips and firmware, 52f7018c21STomi Valkeinen * but allows DisplayLink to increment those for any future incompatible chips 53f7018c21STomi Valkeinen */ 5469de8496SArvind Yadav static const struct usb_device_id id_table[] = { 55f7018c21STomi Valkeinen {.idVendor = 0x17e9, 56f7018c21STomi Valkeinen .bInterfaceClass = 0xff, 57f7018c21STomi Valkeinen .bInterfaceSubClass = 0x00, 58f7018c21STomi Valkeinen .bInterfaceProtocol = 0x00, 59f7018c21STomi Valkeinen .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 60f7018c21STomi Valkeinen USB_DEVICE_ID_MATCH_INT_CLASS | 61f7018c21STomi Valkeinen USB_DEVICE_ID_MATCH_INT_SUBCLASS | 62f7018c21STomi Valkeinen USB_DEVICE_ID_MATCH_INT_PROTOCOL, 63f7018c21STomi Valkeinen }, 64f7018c21STomi Valkeinen {}, 65f7018c21STomi Valkeinen }; 66f7018c21STomi Valkeinen MODULE_DEVICE_TABLE(usb, id_table); 67f7018c21STomi Valkeinen 68f7018c21STomi Valkeinen /* module options */ 697022537bSJason Yan static bool console = true; /* Allow fbcon to open framebuffer */ 707022537bSJason Yan static bool fb_defio = true; /* Detect mmap writes using page faults */ 717022537bSJason Yan static bool shadow = true; /* Optionally disable shadow framebuffer */ 72f7018c21STomi Valkeinen static int pixel_limit; /* Optionally force a pixel resolution limit */ 73f7018c21STomi Valkeinen 747433914eSMikulas Patocka struct dlfb_deferred_free { 757433914eSMikulas Patocka struct list_head list; 767433914eSMikulas Patocka void *mem; 777433914eSMikulas Patocka }; 787433914eSMikulas Patocka 797433914eSMikulas Patocka static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len); 807433914eSMikulas Patocka 81f7018c21STomi Valkeinen /* dlfb keeps a list of urbs for efficient bulk transfers */ 82f7018c21STomi Valkeinen static void dlfb_urb_completion(struct urb *urb); 837ea46206SLadislav Michl static struct urb *dlfb_get_urb(struct dlfb_data *dlfb); 847ea46206SLadislav Michl static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len); 857ea46206SLadislav Michl static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size); 867ea46206SLadislav Michl static void dlfb_free_urb_list(struct dlfb_data *dlfb); 87f7018c21STomi Valkeinen 88f7018c21STomi Valkeinen /* 89f7018c21STomi Valkeinen * All DisplayLink bulk operations start with 0xAF, followed by specific code 90f7018c21STomi Valkeinen * All operations are written to buffers which then later get sent to device 91f7018c21STomi Valkeinen */ 92f7018c21STomi Valkeinen static char *dlfb_set_register(char *buf, u8 reg, u8 val) 93f7018c21STomi Valkeinen { 94f7018c21STomi Valkeinen *buf++ = 0xAF; 95f7018c21STomi Valkeinen *buf++ = 0x20; 96f7018c21STomi Valkeinen *buf++ = reg; 97f7018c21STomi Valkeinen *buf++ = val; 98f7018c21STomi Valkeinen return buf; 99f7018c21STomi Valkeinen } 100f7018c21STomi Valkeinen 101f7018c21STomi Valkeinen static char *dlfb_vidreg_lock(char *buf) 102f7018c21STomi Valkeinen { 103f7018c21STomi Valkeinen return dlfb_set_register(buf, 0xFF, 0x00); 104f7018c21STomi Valkeinen } 105f7018c21STomi Valkeinen 106f7018c21STomi Valkeinen static char *dlfb_vidreg_unlock(char *buf) 107f7018c21STomi Valkeinen { 108f7018c21STomi Valkeinen return dlfb_set_register(buf, 0xFF, 0xFF); 109f7018c21STomi Valkeinen } 110f7018c21STomi Valkeinen 111f7018c21STomi Valkeinen /* 112f7018c21STomi Valkeinen * Map FB_BLANK_* to DisplayLink register 113f7018c21STomi Valkeinen * DLReg FB_BLANK_* 114f7018c21STomi Valkeinen * ----- ----------------------------- 115f7018c21STomi Valkeinen * 0x00 FB_BLANK_UNBLANK (0) 116f7018c21STomi Valkeinen * 0x01 FB_BLANK (1) 117f7018c21STomi Valkeinen * 0x03 FB_BLANK_VSYNC_SUSPEND (2) 118f7018c21STomi Valkeinen * 0x05 FB_BLANK_HSYNC_SUSPEND (3) 119f7018c21STomi Valkeinen * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back 120f7018c21STomi Valkeinen */ 121f7018c21STomi Valkeinen static char *dlfb_blanking(char *buf, int fb_blank) 122f7018c21STomi Valkeinen { 123f7018c21STomi Valkeinen u8 reg; 124f7018c21STomi Valkeinen 125f7018c21STomi Valkeinen switch (fb_blank) { 126f7018c21STomi Valkeinen case FB_BLANK_POWERDOWN: 127f7018c21STomi Valkeinen reg = 0x07; 128f7018c21STomi Valkeinen break; 129f7018c21STomi Valkeinen case FB_BLANK_HSYNC_SUSPEND: 130f7018c21STomi Valkeinen reg = 0x05; 131f7018c21STomi Valkeinen break; 132f7018c21STomi Valkeinen case FB_BLANK_VSYNC_SUSPEND: 133f7018c21STomi Valkeinen reg = 0x03; 134f7018c21STomi Valkeinen break; 135f7018c21STomi Valkeinen case FB_BLANK_NORMAL: 136f7018c21STomi Valkeinen reg = 0x01; 137f7018c21STomi Valkeinen break; 138f7018c21STomi Valkeinen default: 139f7018c21STomi Valkeinen reg = 0x00; 140f7018c21STomi Valkeinen } 141f7018c21STomi Valkeinen 142f7018c21STomi Valkeinen buf = dlfb_set_register(buf, 0x1F, reg); 143f7018c21STomi Valkeinen 144f7018c21STomi Valkeinen return buf; 145f7018c21STomi Valkeinen } 146f7018c21STomi Valkeinen 147f7018c21STomi Valkeinen static char *dlfb_set_color_depth(char *buf, u8 selection) 148f7018c21STomi Valkeinen { 149f7018c21STomi Valkeinen return dlfb_set_register(buf, 0x00, selection); 150f7018c21STomi Valkeinen } 151f7018c21STomi Valkeinen 152f7018c21STomi Valkeinen static char *dlfb_set_base16bpp(char *wrptr, u32 base) 153f7018c21STomi Valkeinen { 154f7018c21STomi Valkeinen /* the base pointer is 16 bits wide, 0x20 is hi byte. */ 155f7018c21STomi Valkeinen wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); 156f7018c21STomi Valkeinen wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); 157f7018c21STomi Valkeinen return dlfb_set_register(wrptr, 0x22, base); 158f7018c21STomi Valkeinen } 159f7018c21STomi Valkeinen 160f7018c21STomi Valkeinen /* 161f7018c21STomi Valkeinen * DisplayLink HW has separate 16bpp and 8bpp framebuffers. 162f7018c21STomi Valkeinen * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer 163f7018c21STomi Valkeinen */ 164f7018c21STomi Valkeinen static char *dlfb_set_base8bpp(char *wrptr, u32 base) 165f7018c21STomi Valkeinen { 166f7018c21STomi Valkeinen wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); 167f7018c21STomi Valkeinen wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); 168f7018c21STomi Valkeinen return dlfb_set_register(wrptr, 0x28, base); 169f7018c21STomi Valkeinen } 170f7018c21STomi Valkeinen 171f7018c21STomi Valkeinen static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) 172f7018c21STomi Valkeinen { 173f7018c21STomi Valkeinen wrptr = dlfb_set_register(wrptr, reg, value >> 8); 174f7018c21STomi Valkeinen return dlfb_set_register(wrptr, reg+1, value); 175f7018c21STomi Valkeinen } 176f7018c21STomi Valkeinen 177f7018c21STomi Valkeinen /* 178f7018c21STomi Valkeinen * This is kind of weird because the controller takes some 179f7018c21STomi Valkeinen * register values in a different byte order than other registers. 180f7018c21STomi Valkeinen */ 181f7018c21STomi Valkeinen static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) 182f7018c21STomi Valkeinen { 183f7018c21STomi Valkeinen wrptr = dlfb_set_register(wrptr, reg, value); 184f7018c21STomi Valkeinen return dlfb_set_register(wrptr, reg+1, value >> 8); 185f7018c21STomi Valkeinen } 186f7018c21STomi Valkeinen 187f7018c21STomi Valkeinen /* 188f7018c21STomi Valkeinen * LFSR is linear feedback shift register. The reason we have this is 189f7018c21STomi Valkeinen * because the display controller needs to minimize the clock depth of 190f7018c21STomi Valkeinen * various counters used in the display path. So this code reverses the 191f7018c21STomi Valkeinen * provided value into the lfsr16 value by counting backwards to get 192f7018c21STomi Valkeinen * the value that needs to be set in the hardware comparator to get the 193f7018c21STomi Valkeinen * same actual count. This makes sense once you read above a couple of 194f7018c21STomi Valkeinen * times and think about it from a hardware perspective. 195f7018c21STomi Valkeinen */ 196f7018c21STomi Valkeinen static u16 dlfb_lfsr16(u16 actual_count) 197f7018c21STomi Valkeinen { 198f7018c21STomi Valkeinen u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ 199f7018c21STomi Valkeinen 200f7018c21STomi Valkeinen while (actual_count--) { 201f7018c21STomi Valkeinen lv = ((lv << 1) | 202f7018c21STomi Valkeinen (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) 203f7018c21STomi Valkeinen & 0xFFFF; 204f7018c21STomi Valkeinen } 205f7018c21STomi Valkeinen 206f7018c21STomi Valkeinen return (u16) lv; 207f7018c21STomi Valkeinen } 208f7018c21STomi Valkeinen 209f7018c21STomi Valkeinen /* 210f7018c21STomi Valkeinen * This does LFSR conversion on the value that is to be written. 211f7018c21STomi Valkeinen * See LFSR explanation above for more detail. 212f7018c21STomi Valkeinen */ 213f7018c21STomi Valkeinen static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) 214f7018c21STomi Valkeinen { 215f7018c21STomi Valkeinen return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); 216f7018c21STomi Valkeinen } 217f7018c21STomi Valkeinen 218f7018c21STomi Valkeinen /* 219f7018c21STomi Valkeinen * This takes a standard fbdev screeninfo struct and all of its monitor mode 220f7018c21STomi Valkeinen * details and converts them into the DisplayLink equivalent register commands. 221f7018c21STomi Valkeinen */ 222f7018c21STomi Valkeinen static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) 223f7018c21STomi Valkeinen { 224f7018c21STomi Valkeinen u16 xds, yds; 225f7018c21STomi Valkeinen u16 xde, yde; 226f7018c21STomi Valkeinen u16 yec; 227f7018c21STomi Valkeinen 228f7018c21STomi Valkeinen /* x display start */ 229f7018c21STomi Valkeinen xds = var->left_margin + var->hsync_len; 230f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); 231f7018c21STomi Valkeinen /* x display end */ 232f7018c21STomi Valkeinen xde = xds + var->xres; 233f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); 234f7018c21STomi Valkeinen 235f7018c21STomi Valkeinen /* y display start */ 236f7018c21STomi Valkeinen yds = var->upper_margin + var->vsync_len; 237f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); 238f7018c21STomi Valkeinen /* y display end */ 239f7018c21STomi Valkeinen yde = yds + var->yres; 240f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); 241f7018c21STomi Valkeinen 242f7018c21STomi Valkeinen /* x end count is active + blanking - 1 */ 243f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, 244f7018c21STomi Valkeinen xde + var->right_margin - 1); 245f7018c21STomi Valkeinen 246f7018c21STomi Valkeinen /* libdlo hardcodes hsync start to 1 */ 247f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); 248f7018c21STomi Valkeinen 249f7018c21STomi Valkeinen /* hsync end is width of sync pulse + 1 */ 250f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); 251f7018c21STomi Valkeinen 252f7018c21STomi Valkeinen /* hpixels is active pixels */ 253f7018c21STomi Valkeinen wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); 254f7018c21STomi Valkeinen 255f7018c21STomi Valkeinen /* yendcount is vertical active + vertical blanking */ 256f7018c21STomi Valkeinen yec = var->yres + var->upper_margin + var->lower_margin + 257f7018c21STomi Valkeinen var->vsync_len; 258f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); 259f7018c21STomi Valkeinen 260f7018c21STomi Valkeinen /* libdlo hardcodes vsync start to 0 */ 261f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); 262f7018c21STomi Valkeinen 263f7018c21STomi Valkeinen /* vsync end is width of vsync pulse */ 264f7018c21STomi Valkeinen wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); 265f7018c21STomi Valkeinen 266f7018c21STomi Valkeinen /* vpixels is active pixels */ 267f7018c21STomi Valkeinen wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); 268f7018c21STomi Valkeinen 269f7018c21STomi Valkeinen /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ 270f7018c21STomi Valkeinen wrptr = dlfb_set_register_16be(wrptr, 0x1B, 271f7018c21STomi Valkeinen 200*1000*1000/var->pixclock); 272f7018c21STomi Valkeinen 273f7018c21STomi Valkeinen return wrptr; 274f7018c21STomi Valkeinen } 275f7018c21STomi Valkeinen 276f7018c21STomi Valkeinen /* 277f7018c21STomi Valkeinen * This takes a standard fbdev screeninfo struct that was fetched or prepared 278f7018c21STomi Valkeinen * and then generates the appropriate command sequence that then drives the 279f7018c21STomi Valkeinen * display controller. 280f7018c21STomi Valkeinen */ 2817ea46206SLadislav Michl static int dlfb_set_video_mode(struct dlfb_data *dlfb, 282f7018c21STomi Valkeinen struct fb_var_screeninfo *var) 283f7018c21STomi Valkeinen { 284f7018c21STomi Valkeinen char *buf; 285f7018c21STomi Valkeinen char *wrptr; 286f63cb8d7SAlexey Klimov int retval; 287f7018c21STomi Valkeinen int writesize; 288f7018c21STomi Valkeinen struct urb *urb; 289f7018c21STomi Valkeinen 2907ea46206SLadislav Michl if (!atomic_read(&dlfb->usb_active)) 291f7018c21STomi Valkeinen return -EPERM; 292f7018c21STomi Valkeinen 2937ea46206SLadislav Michl urb = dlfb_get_urb(dlfb); 294f7018c21STomi Valkeinen if (!urb) 295f7018c21STomi Valkeinen return -ENOMEM; 296f7018c21STomi Valkeinen 297f7018c21STomi Valkeinen buf = (char *) urb->transfer_buffer; 298f7018c21STomi Valkeinen 299f7018c21STomi Valkeinen /* 300f7018c21STomi Valkeinen * This first section has to do with setting the base address on the 301f7018c21STomi Valkeinen * controller * associated with the display. There are 2 base 302f7018c21STomi Valkeinen * pointers, currently, we only * use the 16 bpp segment. 303f7018c21STomi Valkeinen */ 304f7018c21STomi Valkeinen wrptr = dlfb_vidreg_lock(buf); 305f7018c21STomi Valkeinen wrptr = dlfb_set_color_depth(wrptr, 0x00); 306f7018c21STomi Valkeinen /* set base for 16bpp segment to 0 */ 307f7018c21STomi Valkeinen wrptr = dlfb_set_base16bpp(wrptr, 0); 308f7018c21STomi Valkeinen /* set base for 8bpp segment to end of fb */ 3097ea46206SLadislav Michl wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len); 310f7018c21STomi Valkeinen 311f7018c21STomi Valkeinen wrptr = dlfb_set_vid_cmds(wrptr, var); 312f7018c21STomi Valkeinen wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); 313f7018c21STomi Valkeinen wrptr = dlfb_vidreg_unlock(wrptr); 314f7018c21STomi Valkeinen 315f7018c21STomi Valkeinen writesize = wrptr - buf; 316f7018c21STomi Valkeinen 3177ea46206SLadislav Michl retval = dlfb_submit_urb(dlfb, urb, writesize); 318f7018c21STomi Valkeinen 3197ea46206SLadislav Michl dlfb->blank_mode = FB_BLANK_UNBLANK; 320f7018c21STomi Valkeinen 321f7018c21STomi Valkeinen return retval; 322f7018c21STomi Valkeinen } 323f7018c21STomi Valkeinen 324f7018c21STomi Valkeinen static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) 325f7018c21STomi Valkeinen { 326f7018c21STomi Valkeinen unsigned long start = vma->vm_start; 327f7018c21STomi Valkeinen unsigned long size = vma->vm_end - vma->vm_start; 328f7018c21STomi Valkeinen unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 329f7018c21STomi Valkeinen unsigned long page, pos; 330f7018c21STomi Valkeinen 33159055851SThomas Zimmermann if (info->fbdefio) 33259055851SThomas Zimmermann return fb_deferred_io_mmap(info, vma); 33359055851SThomas Zimmermann 334f7018c21STomi Valkeinen if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 335f7018c21STomi Valkeinen return -EINVAL; 336f7018c21STomi Valkeinen if (size > info->fix.smem_len) 337f7018c21STomi Valkeinen return -EINVAL; 338f7018c21STomi Valkeinen if (offset > info->fix.smem_len - size) 339f7018c21STomi Valkeinen return -EINVAL; 340f7018c21STomi Valkeinen 341f7018c21STomi Valkeinen pos = (unsigned long)info->fix.smem_start + offset; 342f7018c21STomi Valkeinen 3435865889fSLadislav Michl dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n", 344f7018c21STomi Valkeinen pos, size); 345f7018c21STomi Valkeinen 346f7018c21STomi Valkeinen while (size > 0) { 347f7018c21STomi Valkeinen page = vmalloc_to_pfn((void *)pos); 348f7018c21STomi Valkeinen if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) 349f7018c21STomi Valkeinen return -EAGAIN; 350f7018c21STomi Valkeinen 351f7018c21STomi Valkeinen start += PAGE_SIZE; 352f7018c21STomi Valkeinen pos += PAGE_SIZE; 353f7018c21STomi Valkeinen if (size > PAGE_SIZE) 354f7018c21STomi Valkeinen size -= PAGE_SIZE; 355f7018c21STomi Valkeinen else 356f7018c21STomi Valkeinen size = 0; 357f7018c21STomi Valkeinen } 358f7018c21STomi Valkeinen 359f7018c21STomi Valkeinen return 0; 360f7018c21STomi Valkeinen } 361f7018c21STomi Valkeinen 362f7018c21STomi Valkeinen /* 363f7018c21STomi Valkeinen * Trims identical data from front and back of line 364f7018c21STomi Valkeinen * Sets new front buffer address and width 365f7018c21STomi Valkeinen * And returns byte count of identical pixels 366f7018c21STomi Valkeinen * Assumes CPU natural alignment (unsigned long) 367f7018c21STomi Valkeinen * for back and front buffer ptrs and width 368f7018c21STomi Valkeinen */ 369f7018c21STomi Valkeinen static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) 370f7018c21STomi Valkeinen { 371f7018c21STomi Valkeinen int j, k; 372f7018c21STomi Valkeinen const unsigned long *back = (const unsigned long *) bback; 373f7018c21STomi Valkeinen const unsigned long *front = (const unsigned long *) *bfront; 374f7018c21STomi Valkeinen const int width = *width_bytes / sizeof(unsigned long); 37559945216SColin Ian King int identical; 376f7018c21STomi Valkeinen int start = width; 377f7018c21STomi Valkeinen int end = width; 378f7018c21STomi Valkeinen 379f7018c21STomi Valkeinen for (j = 0; j < width; j++) { 380f7018c21STomi Valkeinen if (back[j] != front[j]) { 381f7018c21STomi Valkeinen start = j; 382f7018c21STomi Valkeinen break; 383f7018c21STomi Valkeinen } 384f7018c21STomi Valkeinen } 385f7018c21STomi Valkeinen 386f7018c21STomi Valkeinen for (k = width - 1; k > j; k--) { 387f7018c21STomi Valkeinen if (back[k] != front[k]) { 388f7018c21STomi Valkeinen end = k+1; 389f7018c21STomi Valkeinen break; 390f7018c21STomi Valkeinen } 391f7018c21STomi Valkeinen } 392f7018c21STomi Valkeinen 393f7018c21STomi Valkeinen identical = start + (width - end); 394f7018c21STomi Valkeinen *bfront = (u8 *) &front[start]; 395f7018c21STomi Valkeinen *width_bytes = (end - start) * sizeof(unsigned long); 396f7018c21STomi Valkeinen 397f7018c21STomi Valkeinen return identical * sizeof(unsigned long); 398f7018c21STomi Valkeinen } 399f7018c21STomi Valkeinen 400f7018c21STomi Valkeinen /* 401f7018c21STomi Valkeinen * Render a command stream for an encoded horizontal line segment of pixels. 402f7018c21STomi Valkeinen * 403f7018c21STomi Valkeinen * A command buffer holds several commands. 404f7018c21STomi Valkeinen * It always begins with a fresh command header 405f7018c21STomi Valkeinen * (the protocol doesn't require this, but we enforce it to allow 406f7018c21STomi Valkeinen * multiple buffers to be potentially encoded and sent in parallel). 407f7018c21STomi Valkeinen * A single command encodes one contiguous horizontal line of pixels 408f7018c21STomi Valkeinen * 409f7018c21STomi Valkeinen * The function relies on the client to do all allocation, so that 410f7018c21STomi Valkeinen * rendering can be done directly to output buffers (e.g. USB URBs). 411f7018c21STomi Valkeinen * The function fills the supplied command buffer, providing information 412f7018c21STomi Valkeinen * on where it left off, so the client may call in again with additional 413f7018c21STomi Valkeinen * buffers if the line will take several buffers to complete. 414f7018c21STomi Valkeinen * 415f7018c21STomi Valkeinen * A single command can transmit a maximum of 256 pixels, 416f7018c21STomi Valkeinen * regardless of the compression ratio (protocol design limit). 417f7018c21STomi Valkeinen * To the hardware, 0 for a size byte means 256 418f7018c21STomi Valkeinen * 419f7018c21STomi Valkeinen * Rather than 256 pixel commands which are either rl or raw encoded, 420f7018c21STomi Valkeinen * the rlx command simply assumes alternating raw and rl spans within one cmd. 421f7018c21STomi Valkeinen * This has a slightly larger header overhead, but produces more even results. 422f7018c21STomi Valkeinen * It also processes all data (read and write) in a single pass. 423f7018c21STomi Valkeinen * Performance benchmarks of common cases show it having just slightly better 424f7018c21STomi Valkeinen * compression than 256 pixel raw or rle commands, with similar CPU consumpion. 425f7018c21STomi Valkeinen * But for very rl friendly data, will compress not quite as well. 426f7018c21STomi Valkeinen */ 427f7018c21STomi Valkeinen static void dlfb_compress_hline( 428f7018c21STomi Valkeinen const uint16_t **pixel_start_ptr, 429f7018c21STomi Valkeinen const uint16_t *const pixel_end, 430f7018c21STomi Valkeinen uint32_t *device_address_ptr, 431f7018c21STomi Valkeinen uint8_t **command_buffer_ptr, 4328f3c39b8SMikulas Patocka const uint8_t *const cmd_buffer_end, 4338f3c39b8SMikulas Patocka unsigned long back_buffer_offset, 4348f3c39b8SMikulas Patocka int *ident_ptr) 435f7018c21STomi Valkeinen { 436f7018c21STomi Valkeinen const uint16_t *pixel = *pixel_start_ptr; 437f7018c21STomi Valkeinen uint32_t dev_addr = *device_address_ptr; 438f7018c21STomi Valkeinen uint8_t *cmd = *command_buffer_ptr; 439f7018c21STomi Valkeinen 440f7018c21STomi Valkeinen while ((pixel_end > pixel) && 441f7018c21STomi Valkeinen (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { 442f7018c21STomi Valkeinen uint8_t *raw_pixels_count_byte = NULL; 443f7018c21STomi Valkeinen uint8_t *cmd_pixels_count_byte = NULL; 444f7018c21STomi Valkeinen const uint16_t *raw_pixel_start = NULL; 445f7018c21STomi Valkeinen const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; 446f7018c21STomi Valkeinen 4478f3c39b8SMikulas Patocka if (back_buffer_offset && 4488f3c39b8SMikulas Patocka *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) { 4498f3c39b8SMikulas Patocka pixel++; 4508f3c39b8SMikulas Patocka dev_addr += BPP; 4518f3c39b8SMikulas Patocka (*ident_ptr)++; 4528f3c39b8SMikulas Patocka continue; 4538f3c39b8SMikulas Patocka } 4548f3c39b8SMikulas Patocka 455f7018c21STomi Valkeinen *cmd++ = 0xAF; 456f7018c21STomi Valkeinen *cmd++ = 0x6B; 457115e7759SLadislav Michl *cmd++ = dev_addr >> 16; 458115e7759SLadislav Michl *cmd++ = dev_addr >> 8; 459115e7759SLadislav Michl *cmd++ = dev_addr; 460f7018c21STomi Valkeinen 461f7018c21STomi Valkeinen cmd_pixels_count_byte = cmd++; /* we'll know this later */ 462f7018c21STomi Valkeinen cmd_pixel_start = pixel; 463f7018c21STomi Valkeinen 464f7018c21STomi Valkeinen raw_pixels_count_byte = cmd++; /* we'll know this later */ 465f7018c21STomi Valkeinen raw_pixel_start = pixel; 466f7018c21STomi Valkeinen 4674e705e17SMikulas Patocka cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL, 4684e705e17SMikulas Patocka (unsigned long)(pixel_end - pixel), 4694e705e17SMikulas Patocka (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP); 470f7018c21STomi Valkeinen 4718f3c39b8SMikulas Patocka if (back_buffer_offset) { 4728f3c39b8SMikulas Patocka /* note: the framebuffer may change under us, so we must test for underflow */ 4738f3c39b8SMikulas Patocka while (cmd_pixel_end - 1 > pixel && 4748f3c39b8SMikulas Patocka *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset)) 4758f3c39b8SMikulas Patocka cmd_pixel_end--; 4768f3c39b8SMikulas Patocka } 4778f3c39b8SMikulas Patocka 478f7018c21STomi Valkeinen while (pixel < cmd_pixel_end) { 479f7018c21STomi Valkeinen const uint16_t * const repeating_pixel = pixel; 4808f3c39b8SMikulas Patocka u16 pixel_value = *pixel; 481f7018c21STomi Valkeinen 4828f3c39b8SMikulas Patocka put_unaligned_be16(pixel_value, cmd); 4838f3c39b8SMikulas Patocka if (back_buffer_offset) 4848f3c39b8SMikulas Patocka *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; 4854e705e17SMikulas Patocka cmd += 2; 486f7018c21STomi Valkeinen pixel++; 487f7018c21STomi Valkeinen 488f7018c21STomi Valkeinen if (unlikely((pixel < cmd_pixel_end) && 4898f3c39b8SMikulas Patocka (*pixel == pixel_value))) { 490f7018c21STomi Valkeinen /* go back and fill in raw pixel count */ 491f7018c21STomi Valkeinen *raw_pixels_count_byte = ((repeating_pixel - 492f7018c21STomi Valkeinen raw_pixel_start) + 1) & 0xFF; 493f7018c21STomi Valkeinen 4948f3c39b8SMikulas Patocka do { 4958f3c39b8SMikulas Patocka if (back_buffer_offset) 4968f3c39b8SMikulas Patocka *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; 497f7018c21STomi Valkeinen pixel++; 4988f3c39b8SMikulas Patocka } while ((pixel < cmd_pixel_end) && 4998f3c39b8SMikulas Patocka (*pixel == pixel_value)); 500f7018c21STomi Valkeinen 501f7018c21STomi Valkeinen /* immediately after raw data is repeat byte */ 502f7018c21STomi Valkeinen *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; 503f7018c21STomi Valkeinen 504f7018c21STomi Valkeinen /* Then start another raw pixel span */ 505f7018c21STomi Valkeinen raw_pixel_start = pixel; 506f7018c21STomi Valkeinen raw_pixels_count_byte = cmd++; 507f7018c21STomi Valkeinen } 508f7018c21STomi Valkeinen } 509f7018c21STomi Valkeinen 510f7018c21STomi Valkeinen if (pixel > raw_pixel_start) { 511f7018c21STomi Valkeinen /* finalize last RAW span */ 512f7018c21STomi Valkeinen *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; 5134e705e17SMikulas Patocka } else { 5144e705e17SMikulas Patocka /* undo unused byte */ 5154e705e17SMikulas Patocka cmd--; 516f7018c21STomi Valkeinen } 517f7018c21STomi Valkeinen 518f7018c21STomi Valkeinen *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; 5194e705e17SMikulas Patocka dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start; 520f7018c21STomi Valkeinen } 521f7018c21STomi Valkeinen 5224e705e17SMikulas Patocka if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) { 523f7018c21STomi Valkeinen /* Fill leftover bytes with no-ops */ 524f7018c21STomi Valkeinen if (cmd_buffer_end > cmd) 525f7018c21STomi Valkeinen memset(cmd, 0xAF, cmd_buffer_end - cmd); 526f7018c21STomi Valkeinen cmd = (uint8_t *) cmd_buffer_end; 527f7018c21STomi Valkeinen } 528f7018c21STomi Valkeinen 529f7018c21STomi Valkeinen *command_buffer_ptr = cmd; 530f7018c21STomi Valkeinen *pixel_start_ptr = pixel; 531f7018c21STomi Valkeinen *device_address_ptr = dev_addr; 532f7018c21STomi Valkeinen } 533f7018c21STomi Valkeinen 534f7018c21STomi Valkeinen /* 535f7018c21STomi Valkeinen * There are 3 copies of every pixel: The front buffer that the fbdev 536f7018c21STomi Valkeinen * client renders to, the actual framebuffer across the USB bus in hardware 537f7018c21STomi Valkeinen * (that we can only write to, slowly, and can never read), and (optionally) 538f7018c21STomi Valkeinen * our shadow copy that tracks what's been sent to that hardware buffer. 539f7018c21STomi Valkeinen */ 5407ea46206SLadislav Michl static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr, 541f7018c21STomi Valkeinen const char *front, char **urb_buf_ptr, 542f7018c21STomi Valkeinen u32 byte_offset, u32 byte_width, 543f7018c21STomi Valkeinen int *ident_ptr, int *sent_ptr) 544f7018c21STomi Valkeinen { 545f7018c21STomi Valkeinen const u8 *line_start, *line_end, *next_pixel; 5467ea46206SLadislav Michl u32 dev_addr = dlfb->base16 + byte_offset; 547f7018c21STomi Valkeinen struct urb *urb = *urb_ptr; 548f7018c21STomi Valkeinen u8 *cmd = *urb_buf_ptr; 549f7018c21STomi Valkeinen u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; 5508f3c39b8SMikulas Patocka unsigned long back_buffer_offset = 0; 551f7018c21STomi Valkeinen 552f7018c21STomi Valkeinen line_start = (u8 *) (front + byte_offset); 553f7018c21STomi Valkeinen next_pixel = line_start; 554f7018c21STomi Valkeinen line_end = next_pixel + byte_width; 555f7018c21STomi Valkeinen 5567ea46206SLadislav Michl if (dlfb->backing_buffer) { 557f7018c21STomi Valkeinen int offset; 5587ea46206SLadislav Michl const u8 *back_start = (u8 *) (dlfb->backing_buffer 559f7018c21STomi Valkeinen + byte_offset); 560f7018c21STomi Valkeinen 5618f3c39b8SMikulas Patocka back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start; 5628f3c39b8SMikulas Patocka 563f7018c21STomi Valkeinen *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, 564f7018c21STomi Valkeinen &byte_width); 565f7018c21STomi Valkeinen 566f7018c21STomi Valkeinen offset = next_pixel - line_start; 567f7018c21STomi Valkeinen line_end = next_pixel + byte_width; 568f7018c21STomi Valkeinen dev_addr += offset; 569f7018c21STomi Valkeinen back_start += offset; 570f7018c21STomi Valkeinen line_start += offset; 571f7018c21STomi Valkeinen } 572f7018c21STomi Valkeinen 573f7018c21STomi Valkeinen while (next_pixel < line_end) { 574f7018c21STomi Valkeinen 575f7018c21STomi Valkeinen dlfb_compress_hline((const uint16_t **) &next_pixel, 576f7018c21STomi Valkeinen (const uint16_t *) line_end, &dev_addr, 5778f3c39b8SMikulas Patocka (u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset, 5788f3c39b8SMikulas Patocka ident_ptr); 579f7018c21STomi Valkeinen 580f7018c21STomi Valkeinen if (cmd >= cmd_end) { 581f7018c21STomi Valkeinen int len = cmd - (u8 *) urb->transfer_buffer; 5827ea46206SLadislav Michl if (dlfb_submit_urb(dlfb, urb, len)) 583f7018c21STomi Valkeinen return 1; /* lost pixels is set */ 584f7018c21STomi Valkeinen *sent_ptr += len; 5857ea46206SLadislav Michl urb = dlfb_get_urb(dlfb); 586f7018c21STomi Valkeinen if (!urb) 587f7018c21STomi Valkeinen return 1; /* lost_pixels is set */ 588f7018c21STomi Valkeinen *urb_ptr = urb; 589f7018c21STomi Valkeinen cmd = urb->transfer_buffer; 590f7018c21STomi Valkeinen cmd_end = &cmd[urb->transfer_buffer_length]; 591f7018c21STomi Valkeinen } 592f7018c21STomi Valkeinen } 593f7018c21STomi Valkeinen 594f7018c21STomi Valkeinen *urb_buf_ptr = cmd; 595f7018c21STomi Valkeinen 596f7018c21STomi Valkeinen return 0; 597f7018c21STomi Valkeinen } 598f7018c21STomi Valkeinen 599bd86b6c5SMikulas Patocka static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) 600f7018c21STomi Valkeinen { 601babc250eSMikulas Patocka int i, ret; 602f7018c21STomi Valkeinen char *cmd; 603f7018c21STomi Valkeinen cycles_t start_cycles, end_cycles; 604f7018c21STomi Valkeinen int bytes_sent = 0; 605f7018c21STomi Valkeinen int bytes_identical = 0; 606f7018c21STomi Valkeinen struct urb *urb; 607f7018c21STomi Valkeinen int aligned_x; 608f7018c21STomi Valkeinen 609f7018c21STomi Valkeinen start_cycles = get_cycles(); 610f7018c21STomi Valkeinen 611babc250eSMikulas Patocka mutex_lock(&dlfb->render_mutex); 612babc250eSMikulas Patocka 613f7018c21STomi Valkeinen aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); 614f7018c21STomi Valkeinen width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); 615f7018c21STomi Valkeinen x = aligned_x; 616f7018c21STomi Valkeinen 617f7018c21STomi Valkeinen if ((width <= 0) || 6187ea46206SLadislav Michl (x + width > dlfb->info->var.xres) || 619babc250eSMikulas Patocka (y + height > dlfb->info->var.yres)) { 620babc250eSMikulas Patocka ret = -EINVAL; 621babc250eSMikulas Patocka goto unlock_ret; 622babc250eSMikulas Patocka } 623f7018c21STomi Valkeinen 624babc250eSMikulas Patocka if (!atomic_read(&dlfb->usb_active)) { 625babc250eSMikulas Patocka ret = 0; 626babc250eSMikulas Patocka goto unlock_ret; 627babc250eSMikulas Patocka } 628f7018c21STomi Valkeinen 6297ea46206SLadislav Michl urb = dlfb_get_urb(dlfb); 630babc250eSMikulas Patocka if (!urb) { 631babc250eSMikulas Patocka ret = 0; 632babc250eSMikulas Patocka goto unlock_ret; 633babc250eSMikulas Patocka } 634f7018c21STomi Valkeinen cmd = urb->transfer_buffer; 635f7018c21STomi Valkeinen 636f7018c21STomi Valkeinen for (i = y; i < y + height ; i++) { 6377ea46206SLadislav Michl const int line_offset = dlfb->info->fix.line_length * i; 638f7018c21STomi Valkeinen const int byte_offset = line_offset + (x * BPP); 639f7018c21STomi Valkeinen 6407ea46206SLadislav Michl if (dlfb_render_hline(dlfb, &urb, 6417ea46206SLadislav Michl (char *) dlfb->info->fix.smem_start, 642f7018c21STomi Valkeinen &cmd, byte_offset, width * BPP, 643f7018c21STomi Valkeinen &bytes_identical, &bytes_sent)) 644f7018c21STomi Valkeinen goto error; 645f7018c21STomi Valkeinen } 646f7018c21STomi Valkeinen 647f7018c21STomi Valkeinen if (cmd > (char *) urb->transfer_buffer) { 6484e705e17SMikulas Patocka int len; 6494e705e17SMikulas Patocka if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) 6504e705e17SMikulas Patocka *cmd++ = 0xAF; 651f7018c21STomi Valkeinen /* Send partial buffer remaining before exiting */ 6524e705e17SMikulas Patocka len = cmd - (char *) urb->transfer_buffer; 653bd86b6c5SMikulas Patocka dlfb_submit_urb(dlfb, urb, len); 654f7018c21STomi Valkeinen bytes_sent += len; 655f7018c21STomi Valkeinen } else 656f7018c21STomi Valkeinen dlfb_urb_completion(urb); 657f7018c21STomi Valkeinen 658f7018c21STomi Valkeinen error: 6597ea46206SLadislav Michl atomic_add(bytes_sent, &dlfb->bytes_sent); 6607ea46206SLadislav Michl atomic_add(bytes_identical, &dlfb->bytes_identical); 6617ea46206SLadislav Michl atomic_add(width*height*2, &dlfb->bytes_rendered); 662f7018c21STomi Valkeinen end_cycles = get_cycles(); 663f7018c21STomi Valkeinen atomic_add(((unsigned int) ((end_cycles - start_cycles) 664f7018c21STomi Valkeinen >> 10)), /* Kcycles */ 6657ea46206SLadislav Michl &dlfb->cpu_kcycles_used); 666f7018c21STomi Valkeinen 667babc250eSMikulas Patocka ret = 0; 668babc250eSMikulas Patocka 669babc250eSMikulas Patocka unlock_ret: 670babc250eSMikulas Patocka mutex_unlock(&dlfb->render_mutex); 671babc250eSMikulas Patocka return ret; 672f7018c21STomi Valkeinen } 673f7018c21STomi Valkeinen 6746b11f9d8SMikulas Patocka static void dlfb_init_damage(struct dlfb_data *dlfb) 6756b11f9d8SMikulas Patocka { 6766b11f9d8SMikulas Patocka dlfb->damage_x = INT_MAX; 6776b11f9d8SMikulas Patocka dlfb->damage_x2 = 0; 6786b11f9d8SMikulas Patocka dlfb->damage_y = INT_MAX; 6796b11f9d8SMikulas Patocka dlfb->damage_y2 = 0; 6806b11f9d8SMikulas Patocka } 6816b11f9d8SMikulas Patocka 6826b11f9d8SMikulas Patocka static void dlfb_damage_work(struct work_struct *w) 6836b11f9d8SMikulas Patocka { 6846b11f9d8SMikulas Patocka struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work); 6856b11f9d8SMikulas Patocka int x, x2, y, y2; 6866b11f9d8SMikulas Patocka 6876b11f9d8SMikulas Patocka spin_lock_irq(&dlfb->damage_lock); 6886b11f9d8SMikulas Patocka x = dlfb->damage_x; 6896b11f9d8SMikulas Patocka x2 = dlfb->damage_x2; 6906b11f9d8SMikulas Patocka y = dlfb->damage_y; 6916b11f9d8SMikulas Patocka y2 = dlfb->damage_y2; 6926b11f9d8SMikulas Patocka dlfb_init_damage(dlfb); 6936b11f9d8SMikulas Patocka spin_unlock_irq(&dlfb->damage_lock); 6946b11f9d8SMikulas Patocka 6956b11f9d8SMikulas Patocka if (x < x2 && y < y2) 6966b11f9d8SMikulas Patocka dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y); 6976b11f9d8SMikulas Patocka } 6986b11f9d8SMikulas Patocka 6996b11f9d8SMikulas Patocka static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) 7006b11f9d8SMikulas Patocka { 7016b11f9d8SMikulas Patocka unsigned long flags; 7026b11f9d8SMikulas Patocka int x2 = x + width; 7036b11f9d8SMikulas Patocka int y2 = y + height; 7046b11f9d8SMikulas Patocka 7056b11f9d8SMikulas Patocka if (x >= x2 || y >= y2) 7066b11f9d8SMikulas Patocka return; 7076b11f9d8SMikulas Patocka 7086b11f9d8SMikulas Patocka spin_lock_irqsave(&dlfb->damage_lock, flags); 7096b11f9d8SMikulas Patocka dlfb->damage_x = min(x, dlfb->damage_x); 7106b11f9d8SMikulas Patocka dlfb->damage_x2 = max(x2, dlfb->damage_x2); 7116b11f9d8SMikulas Patocka dlfb->damage_y = min(y, dlfb->damage_y); 7126b11f9d8SMikulas Patocka dlfb->damage_y2 = max(y2, dlfb->damage_y2); 7136b11f9d8SMikulas Patocka spin_unlock_irqrestore(&dlfb->damage_lock, flags); 7146b11f9d8SMikulas Patocka 7156b11f9d8SMikulas Patocka schedule_work(&dlfb->damage_work); 7166b11f9d8SMikulas Patocka } 7176b11f9d8SMikulas Patocka 718f7018c21STomi Valkeinen /* 719f7018c21STomi Valkeinen * Path triggered by usermode clients who write to filesystem 720f7018c21STomi Valkeinen * e.g. cat filename > /dev/fb1 721f7018c21STomi Valkeinen * Not used by X Windows or text-mode console. But useful for testing. 722f7018c21STomi Valkeinen * Slow because of extra copy and we must assume all pixels dirty. 723f7018c21STomi Valkeinen */ 724f7018c21STomi Valkeinen static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, 725f7018c21STomi Valkeinen size_t count, loff_t *ppos) 726f7018c21STomi Valkeinen { 727f7018c21STomi Valkeinen ssize_t result; 7287ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 729f7018c21STomi Valkeinen u32 offset = (u32) *ppos; 730f7018c21STomi Valkeinen 731f7018c21STomi Valkeinen result = fb_sys_write(info, buf, count, ppos); 732f7018c21STomi Valkeinen 733f7018c21STomi Valkeinen if (result > 0) { 734f7018c21STomi Valkeinen int start = max((int)(offset / info->fix.line_length), 0); 735f7018c21STomi Valkeinen int lines = min((u32)((result / info->fix.line_length) + 1), 736f7018c21STomi Valkeinen (u32)info->var.yres); 737f7018c21STomi Valkeinen 7387ea46206SLadislav Michl dlfb_handle_damage(dlfb, 0, start, info->var.xres, 739bd86b6c5SMikulas Patocka lines); 740f7018c21STomi Valkeinen } 741f7018c21STomi Valkeinen 742f7018c21STomi Valkeinen return result; 743f7018c21STomi Valkeinen } 744f7018c21STomi Valkeinen 745f7018c21STomi Valkeinen /* hardware has native COPY command (see libdlo), but not worth it for fbcon */ 746f7018c21STomi Valkeinen static void dlfb_ops_copyarea(struct fb_info *info, 747f7018c21STomi Valkeinen const struct fb_copyarea *area) 748f7018c21STomi Valkeinen { 749f7018c21STomi Valkeinen 7507ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 751f7018c21STomi Valkeinen 752f7018c21STomi Valkeinen sys_copyarea(info, area); 753f7018c21STomi Valkeinen 7546b11f9d8SMikulas Patocka dlfb_offload_damage(dlfb, area->dx, area->dy, 755bd86b6c5SMikulas Patocka area->width, area->height); 756f7018c21STomi Valkeinen } 757f7018c21STomi Valkeinen 758f7018c21STomi Valkeinen static void dlfb_ops_imageblit(struct fb_info *info, 759f7018c21STomi Valkeinen const struct fb_image *image) 760f7018c21STomi Valkeinen { 7617ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 762f7018c21STomi Valkeinen 763f7018c21STomi Valkeinen sys_imageblit(info, image); 764f7018c21STomi Valkeinen 7656b11f9d8SMikulas Patocka dlfb_offload_damage(dlfb, image->dx, image->dy, 766bd86b6c5SMikulas Patocka image->width, image->height); 767f7018c21STomi Valkeinen } 768f7018c21STomi Valkeinen 769f7018c21STomi Valkeinen static void dlfb_ops_fillrect(struct fb_info *info, 770f7018c21STomi Valkeinen const struct fb_fillrect *rect) 771f7018c21STomi Valkeinen { 7727ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 773f7018c21STomi Valkeinen 774f7018c21STomi Valkeinen sys_fillrect(info, rect); 775f7018c21STomi Valkeinen 7766b11f9d8SMikulas Patocka dlfb_offload_damage(dlfb, rect->dx, rect->dy, rect->width, 777bd86b6c5SMikulas Patocka rect->height); 778f7018c21STomi Valkeinen } 779f7018c21STomi Valkeinen 780f7018c21STomi Valkeinen /* 781f7018c21STomi Valkeinen * NOTE: fb_defio.c is holding info->fbdefio.mutex 782f7018c21STomi Valkeinen * Touching ANY framebuffer memory that triggers a page fault 783f7018c21STomi Valkeinen * in fb_defio will cause a deadlock, when it also tries to 784f7018c21STomi Valkeinen * grab the same mutex. 785f7018c21STomi Valkeinen */ 786e80eec1bSThomas Zimmermann static void dlfb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist) 787f7018c21STomi Valkeinen { 78856c134f7SThomas Zimmermann struct fb_deferred_io_pageref *pageref; 7897ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 790f7018c21STomi Valkeinen struct urb *urb; 791f7018c21STomi Valkeinen char *cmd; 792f7018c21STomi Valkeinen cycles_t start_cycles, end_cycles; 793f7018c21STomi Valkeinen int bytes_sent = 0; 794f7018c21STomi Valkeinen int bytes_identical = 0; 795f7018c21STomi Valkeinen int bytes_rendered = 0; 796f7018c21STomi Valkeinen 797babc250eSMikulas Patocka mutex_lock(&dlfb->render_mutex); 798babc250eSMikulas Patocka 799f7018c21STomi Valkeinen if (!fb_defio) 800babc250eSMikulas Patocka goto unlock_ret; 801f7018c21STomi Valkeinen 8027ea46206SLadislav Michl if (!atomic_read(&dlfb->usb_active)) 803babc250eSMikulas Patocka goto unlock_ret; 804f7018c21STomi Valkeinen 805f7018c21STomi Valkeinen start_cycles = get_cycles(); 806f7018c21STomi Valkeinen 8077ea46206SLadislav Michl urb = dlfb_get_urb(dlfb); 808f7018c21STomi Valkeinen if (!urb) 809babc250eSMikulas Patocka goto unlock_ret; 810f7018c21STomi Valkeinen 811f7018c21STomi Valkeinen cmd = urb->transfer_buffer; 812f7018c21STomi Valkeinen 813f7018c21STomi Valkeinen /* walk the written page list and render each to device */ 814e80eec1bSThomas Zimmermann list_for_each_entry(pageref, pagereflist, list) { 8157ea46206SLadislav Michl if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start, 816e2d8b428SThomas Zimmermann &cmd, pageref->offset, PAGE_SIZE, 817e2d8b428SThomas Zimmermann &bytes_identical, &bytes_sent)) 818f7018c21STomi Valkeinen goto error; 819f7018c21STomi Valkeinen bytes_rendered += PAGE_SIZE; 820f7018c21STomi Valkeinen } 821f7018c21STomi Valkeinen 822f7018c21STomi Valkeinen if (cmd > (char *) urb->transfer_buffer) { 8234e705e17SMikulas Patocka int len; 8244e705e17SMikulas Patocka if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) 8254e705e17SMikulas Patocka *cmd++ = 0xAF; 826f7018c21STomi Valkeinen /* Send partial buffer remaining before exiting */ 8274e705e17SMikulas Patocka len = cmd - (char *) urb->transfer_buffer; 8287ea46206SLadislav Michl dlfb_submit_urb(dlfb, urb, len); 829f7018c21STomi Valkeinen bytes_sent += len; 830f7018c21STomi Valkeinen } else 831f7018c21STomi Valkeinen dlfb_urb_completion(urb); 832f7018c21STomi Valkeinen 833f7018c21STomi Valkeinen error: 8347ea46206SLadislav Michl atomic_add(bytes_sent, &dlfb->bytes_sent); 8357ea46206SLadislav Michl atomic_add(bytes_identical, &dlfb->bytes_identical); 8367ea46206SLadislav Michl atomic_add(bytes_rendered, &dlfb->bytes_rendered); 837f7018c21STomi Valkeinen end_cycles = get_cycles(); 838f7018c21STomi Valkeinen atomic_add(((unsigned int) ((end_cycles - start_cycles) 839f7018c21STomi Valkeinen >> 10)), /* Kcycles */ 8407ea46206SLadislav Michl &dlfb->cpu_kcycles_used); 841babc250eSMikulas Patocka unlock_ret: 842babc250eSMikulas Patocka mutex_unlock(&dlfb->render_mutex); 843f7018c21STomi Valkeinen } 844f7018c21STomi Valkeinen 8457ea46206SLadislav Michl static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len) 846f7018c21STomi Valkeinen { 8475865889fSLadislav Michl int i, ret; 848f7018c21STomi Valkeinen char *rbuf; 849f7018c21STomi Valkeinen 850f7018c21STomi Valkeinen rbuf = kmalloc(2, GFP_KERNEL); 851f7018c21STomi Valkeinen if (!rbuf) 852f7018c21STomi Valkeinen return 0; 853f7018c21STomi Valkeinen 854f7018c21STomi Valkeinen for (i = 0; i < len; i++) { 8557ea46206SLadislav Michl ret = usb_control_msg(dlfb->udev, 8567ea46206SLadislav Michl usb_rcvctrlpipe(dlfb->udev, 0), 0x02, 857c9876947SLadislav Michl (0x80 | (0x02 << 5)), i << 8, 0xA1, 858c9876947SLadislav Michl rbuf, 2, USB_CTRL_GET_TIMEOUT); 859c9876947SLadislav Michl if (ret < 2) { 8605865889fSLadislav Michl dev_err(&dlfb->udev->dev, 8615865889fSLadislav Michl "Read EDID byte %d failed: %d\n", i, ret); 862f7018c21STomi Valkeinen i--; 863f7018c21STomi Valkeinen break; 864f7018c21STomi Valkeinen } 865f7018c21STomi Valkeinen edid[i] = rbuf[1]; 866f7018c21STomi Valkeinen } 867f7018c21STomi Valkeinen 868f7018c21STomi Valkeinen kfree(rbuf); 869f7018c21STomi Valkeinen 870f7018c21STomi Valkeinen return i; 871f7018c21STomi Valkeinen } 872f7018c21STomi Valkeinen 873f7018c21STomi Valkeinen static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, 874f7018c21STomi Valkeinen unsigned long arg) 875f7018c21STomi Valkeinen { 876f7018c21STomi Valkeinen 8777ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 878f7018c21STomi Valkeinen 8797ea46206SLadislav Michl if (!atomic_read(&dlfb->usb_active)) 880f7018c21STomi Valkeinen return 0; 881f7018c21STomi Valkeinen 882f7018c21STomi Valkeinen /* TODO: Update X server to get this from sysfs instead */ 883f7018c21STomi Valkeinen if (cmd == DLFB_IOCTL_RETURN_EDID) { 884f7018c21STomi Valkeinen void __user *edid = (void __user *)arg; 8857ea46206SLadislav Michl if (copy_to_user(edid, dlfb->edid, dlfb->edid_size)) 886f7018c21STomi Valkeinen return -EFAULT; 887f7018c21STomi Valkeinen return 0; 888f7018c21STomi Valkeinen } 889f7018c21STomi Valkeinen 890f7018c21STomi Valkeinen /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ 891f7018c21STomi Valkeinen if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { 892f7018c21STomi Valkeinen struct dloarea area; 893f7018c21STomi Valkeinen 894f7018c21STomi Valkeinen if (copy_from_user(&area, (void __user *)arg, 895f7018c21STomi Valkeinen sizeof(struct dloarea))) 896f7018c21STomi Valkeinen return -EFAULT; 897f7018c21STomi Valkeinen 898f7018c21STomi Valkeinen /* 899f7018c21STomi Valkeinen * If we have a damage-aware client, turn fb_defio "off" 900f7018c21STomi Valkeinen * To avoid perf imact of unnecessary page fault handling. 901f7018c21STomi Valkeinen * Done by resetting the delay for this fb_info to a very 902f7018c21STomi Valkeinen * long period. Pages will become writable and stay that way. 903f7018c21STomi Valkeinen * Reset to normal value when all clients have closed this fb. 904f7018c21STomi Valkeinen */ 905f7018c21STomi Valkeinen if (info->fbdefio) 906f7018c21STomi Valkeinen info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; 907f7018c21STomi Valkeinen 908f7018c21STomi Valkeinen if (area.x < 0) 909f7018c21STomi Valkeinen area.x = 0; 910f7018c21STomi Valkeinen 911f7018c21STomi Valkeinen if (area.x > info->var.xres) 912f7018c21STomi Valkeinen area.x = info->var.xres; 913f7018c21STomi Valkeinen 914f7018c21STomi Valkeinen if (area.y < 0) 915f7018c21STomi Valkeinen area.y = 0; 916f7018c21STomi Valkeinen 917f7018c21STomi Valkeinen if (area.y > info->var.yres) 918f7018c21STomi Valkeinen area.y = info->var.yres; 919f7018c21STomi Valkeinen 920bd86b6c5SMikulas Patocka dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h); 921f7018c21STomi Valkeinen } 922f7018c21STomi Valkeinen 923f7018c21STomi Valkeinen return 0; 924f7018c21STomi Valkeinen } 925f7018c21STomi Valkeinen 926f7018c21STomi Valkeinen /* taken from vesafb */ 927f7018c21STomi Valkeinen static int 928f7018c21STomi Valkeinen dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, 929f7018c21STomi Valkeinen unsigned blue, unsigned transp, struct fb_info *info) 930f7018c21STomi Valkeinen { 931f7018c21STomi Valkeinen int err = 0; 932f7018c21STomi Valkeinen 933f7018c21STomi Valkeinen if (regno >= info->cmap.len) 934f7018c21STomi Valkeinen return 1; 935f7018c21STomi Valkeinen 936f7018c21STomi Valkeinen if (regno < 16) { 937f7018c21STomi Valkeinen if (info->var.red.offset == 10) { 938f7018c21STomi Valkeinen /* 1:5:5:5 */ 939f7018c21STomi Valkeinen ((u32 *) (info->pseudo_palette))[regno] = 940f7018c21STomi Valkeinen ((red & 0xf800) >> 1) | 941f7018c21STomi Valkeinen ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); 942f7018c21STomi Valkeinen } else { 943f7018c21STomi Valkeinen /* 0:5:6:5 */ 944f7018c21STomi Valkeinen ((u32 *) (info->pseudo_palette))[regno] = 945f7018c21STomi Valkeinen ((red & 0xf800)) | 946f7018c21STomi Valkeinen ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); 947f7018c21STomi Valkeinen } 948f7018c21STomi Valkeinen } 949f7018c21STomi Valkeinen 950f7018c21STomi Valkeinen return err; 951f7018c21STomi Valkeinen } 952f7018c21STomi Valkeinen 953f7018c21STomi Valkeinen /* 954f7018c21STomi Valkeinen * It's common for several clients to have framebuffer open simultaneously. 955f7018c21STomi Valkeinen * e.g. both fbcon and X. Makes things interesting. 956f7018c21STomi Valkeinen * Assumes caller is holding info->lock (for open and release at least) 957f7018c21STomi Valkeinen */ 958f7018c21STomi Valkeinen static int dlfb_ops_open(struct fb_info *info, int user) 959f7018c21STomi Valkeinen { 9607ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 961f7018c21STomi Valkeinen 962f7018c21STomi Valkeinen /* 963f7018c21STomi Valkeinen * fbcon aggressively connects to first framebuffer it finds, 964f7018c21STomi Valkeinen * preventing other clients (X) from working properly. Usually 965f7018c21STomi Valkeinen * not what the user wants. Fail by default with option to enable. 966f7018c21STomi Valkeinen */ 967f7018c21STomi Valkeinen if ((user == 0) && (!console)) 968f7018c21STomi Valkeinen return -EBUSY; 969f7018c21STomi Valkeinen 970f7018c21STomi Valkeinen /* If the USB device is gone, we don't accept new opens */ 9717ea46206SLadislav Michl if (dlfb->virtualized) 972f7018c21STomi Valkeinen return -ENODEV; 973f7018c21STomi Valkeinen 9747ea46206SLadislav Michl dlfb->fb_count++; 975f7018c21STomi Valkeinen 976f7018c21STomi Valkeinen if (fb_defio && (info->fbdefio == NULL)) { 977f7018c21STomi Valkeinen /* enable defio at last moment if not disabled by client */ 978f7018c21STomi Valkeinen 979f7018c21STomi Valkeinen struct fb_deferred_io *fbdefio; 980f7018c21STomi Valkeinen 981f7018c21STomi Valkeinen fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); 982f7018c21STomi Valkeinen 983f7018c21STomi Valkeinen if (fbdefio) { 984f7018c21STomi Valkeinen fbdefio->delay = DL_DEFIO_WRITE_DELAY; 985e80eec1bSThomas Zimmermann fbdefio->sort_pagereflist = true; 986f7018c21STomi Valkeinen fbdefio->deferred_io = dlfb_dpy_deferred_io; 987f7018c21STomi Valkeinen } 988f7018c21STomi Valkeinen 989f7018c21STomi Valkeinen info->fbdefio = fbdefio; 990f7018c21STomi Valkeinen fb_deferred_io_init(info); 991f7018c21STomi Valkeinen } 992f7018c21STomi Valkeinen 9935865889fSLadislav Michl dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n", 9945865889fSLadislav Michl user, info, dlfb->fb_count); 995f7018c21STomi Valkeinen 996f7018c21STomi Valkeinen return 0; 997f7018c21STomi Valkeinen } 998f7018c21STomi Valkeinen 99968a958a9SMikulas Patocka static void dlfb_ops_destroy(struct fb_info *info) 1000f7018c21STomi Valkeinen { 100168a958a9SMikulas Patocka struct dlfb_data *dlfb = info->par; 1002f7018c21STomi Valkeinen 10036b11f9d8SMikulas Patocka cancel_work_sync(&dlfb->damage_work); 10046b11f9d8SMikulas Patocka 1005babc250eSMikulas Patocka mutex_destroy(&dlfb->render_mutex); 1006babc250eSMikulas Patocka 1007f7018c21STomi Valkeinen if (info->cmap.len != 0) 1008f7018c21STomi Valkeinen fb_dealloc_cmap(&info->cmap); 1009f7018c21STomi Valkeinen if (info->monspecs.modedb) 1010f7018c21STomi Valkeinen fb_destroy_modedb(info->monspecs.modedb); 1011f7018c21STomi Valkeinen vfree(info->screen_base); 1012f7018c21STomi Valkeinen 1013f7018c21STomi Valkeinen fb_destroy_modelist(&info->modelist); 1014f7018c21STomi Valkeinen 101568a958a9SMikulas Patocka while (!list_empty(&dlfb->deferred_free)) { 101668a958a9SMikulas Patocka struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list); 101768a958a9SMikulas Patocka list_del(&d->list); 101868a958a9SMikulas Patocka vfree(d->mem); 101968a958a9SMikulas Patocka kfree(d); 102068a958a9SMikulas Patocka } 102168a958a9SMikulas Patocka vfree(dlfb->backing_buffer); 102268a958a9SMikulas Patocka kfree(dlfb->edid); 10235c0e4110SZqiang dlfb_free_urb_list(dlfb); 102468a958a9SMikulas Patocka usb_put_dev(dlfb->udev); 102568a958a9SMikulas Patocka kfree(dlfb); 1026f7018c21STomi Valkeinen 1027f7018c21STomi Valkeinen /* Assume info structure is freed after this point */ 1028f7018c21STomi Valkeinen framebuffer_release(info); 1029f7018c21STomi Valkeinen } 1030f7018c21STomi Valkeinen 1031f7018c21STomi Valkeinen /* 1032f7018c21STomi Valkeinen * Assumes caller is holding info->lock mutex (for open and release at least) 1033f7018c21STomi Valkeinen */ 1034f7018c21STomi Valkeinen static int dlfb_ops_release(struct fb_info *info, int user) 1035f7018c21STomi Valkeinen { 10367ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 1037f7018c21STomi Valkeinen 10387ea46206SLadislav Michl dlfb->fb_count--; 1039f7018c21STomi Valkeinen 10407ea46206SLadislav Michl if ((dlfb->fb_count == 0) && (info->fbdefio)) { 1041f7018c21STomi Valkeinen fb_deferred_io_cleanup(info); 1042f7018c21STomi Valkeinen kfree(info->fbdefio); 1043f7018c21STomi Valkeinen info->fbdefio = NULL; 1044f7018c21STomi Valkeinen } 1045f7018c21STomi Valkeinen 10465865889fSLadislav Michl dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); 1047f7018c21STomi Valkeinen 1048f7018c21STomi Valkeinen return 0; 1049f7018c21STomi Valkeinen } 1050f7018c21STomi Valkeinen 1051f7018c21STomi Valkeinen /* 1052f7018c21STomi Valkeinen * Check whether a video mode is supported by the DisplayLink chip 1053f7018c21STomi Valkeinen * We start from monitor's modes, so don't need to filter that here 1054f7018c21STomi Valkeinen */ 10555865889fSLadislav Michl static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb) 1056f7018c21STomi Valkeinen { 10575865889fSLadislav Michl if (mode->xres * mode->yres > dlfb->sku_pixel_limit) 1058f7018c21STomi Valkeinen return 0; 1059f7018c21STomi Valkeinen 1060f7018c21STomi Valkeinen return 1; 1061f7018c21STomi Valkeinen } 1062f7018c21STomi Valkeinen 1063f7018c21STomi Valkeinen static void dlfb_var_color_format(struct fb_var_screeninfo *var) 1064f7018c21STomi Valkeinen { 1065f7018c21STomi Valkeinen const struct fb_bitfield red = { 11, 5, 0 }; 1066f7018c21STomi Valkeinen const struct fb_bitfield green = { 5, 6, 0 }; 1067f7018c21STomi Valkeinen const struct fb_bitfield blue = { 0, 5, 0 }; 1068f7018c21STomi Valkeinen 1069f7018c21STomi Valkeinen var->bits_per_pixel = 16; 1070f7018c21STomi Valkeinen var->red = red; 1071f7018c21STomi Valkeinen var->green = green; 1072f7018c21STomi Valkeinen var->blue = blue; 1073f7018c21STomi Valkeinen } 1074f7018c21STomi Valkeinen 1075f7018c21STomi Valkeinen static int dlfb_ops_check_var(struct fb_var_screeninfo *var, 1076f7018c21STomi Valkeinen struct fb_info *info) 1077f7018c21STomi Valkeinen { 1078f7018c21STomi Valkeinen struct fb_videomode mode; 10795865889fSLadislav Michl struct dlfb_data *dlfb = info->par; 1080f7018c21STomi Valkeinen 1081f7018c21STomi Valkeinen /* set device-specific elements of var unrelated to mode */ 1082f7018c21STomi Valkeinen dlfb_var_color_format(var); 1083f7018c21STomi Valkeinen 1084f7018c21STomi Valkeinen fb_var_to_videomode(&mode, var); 1085f7018c21STomi Valkeinen 10865865889fSLadislav Michl if (!dlfb_is_valid_mode(&mode, dlfb)) 1087f7018c21STomi Valkeinen return -EINVAL; 1088f7018c21STomi Valkeinen 1089f7018c21STomi Valkeinen return 0; 1090f7018c21STomi Valkeinen } 1091f7018c21STomi Valkeinen 1092f7018c21STomi Valkeinen static int dlfb_ops_set_par(struct fb_info *info) 1093f7018c21STomi Valkeinen { 10947ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 1095f7018c21STomi Valkeinen int result; 1096f7018c21STomi Valkeinen u16 *pix_framebuffer; 1097f7018c21STomi Valkeinen int i; 1098564f1807SMikulas Patocka struct fb_var_screeninfo fvs; 10997433914eSMikulas Patocka u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8); 1100564f1807SMikulas Patocka 1101564f1807SMikulas Patocka /* clear the activate field because it causes spurious miscompares */ 1102564f1807SMikulas Patocka fvs = info->var; 1103564f1807SMikulas Patocka fvs.activate = 0; 1104564f1807SMikulas Patocka fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN; 1105564f1807SMikulas Patocka 1106564f1807SMikulas Patocka if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo))) 1107564f1807SMikulas Patocka return 0; 1108f7018c21STomi Valkeinen 11097433914eSMikulas Patocka result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length); 11107433914eSMikulas Patocka if (result) 11117433914eSMikulas Patocka return result; 11127433914eSMikulas Patocka 11137ea46206SLadislav Michl result = dlfb_set_video_mode(dlfb, &info->var); 1114f7018c21STomi Valkeinen 1115564f1807SMikulas Patocka if (result) 1116564f1807SMikulas Patocka return result; 1117564f1807SMikulas Patocka 1118564f1807SMikulas Patocka dlfb->current_mode = fvs; 11197433914eSMikulas Patocka info->fix.line_length = line_length; 1120564f1807SMikulas Patocka 1121564f1807SMikulas Patocka if (dlfb->fb_count == 0) { 1122f7018c21STomi Valkeinen 1123f7018c21STomi Valkeinen /* paint greenscreen */ 1124f7018c21STomi Valkeinen 1125f7018c21STomi Valkeinen pix_framebuffer = (u16 *) info->screen_base; 1126f7018c21STomi Valkeinen for (i = 0; i < info->fix.smem_len / 2; i++) 1127f7018c21STomi Valkeinen pix_framebuffer[i] = 0x37e6; 11287433914eSMikulas Patocka } 1129f7018c21STomi Valkeinen 1130bd86b6c5SMikulas Patocka dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres); 1131f7018c21STomi Valkeinen 1132564f1807SMikulas Patocka return 0; 1133f7018c21STomi Valkeinen } 1134f7018c21STomi Valkeinen 1135f7018c21STomi Valkeinen /* To fonzi the jukebox (e.g. make blanking changes take effect) */ 1136f7018c21STomi Valkeinen static char *dlfb_dummy_render(char *buf) 1137f7018c21STomi Valkeinen { 1138f7018c21STomi Valkeinen *buf++ = 0xAF; 1139f7018c21STomi Valkeinen *buf++ = 0x6A; /* copy */ 1140f7018c21STomi Valkeinen *buf++ = 0x00; /* from address*/ 1141f7018c21STomi Valkeinen *buf++ = 0x00; 1142f7018c21STomi Valkeinen *buf++ = 0x00; 1143f7018c21STomi Valkeinen *buf++ = 0x01; /* one pixel */ 1144f7018c21STomi Valkeinen *buf++ = 0x00; /* to address */ 1145f7018c21STomi Valkeinen *buf++ = 0x00; 1146f7018c21STomi Valkeinen *buf++ = 0x00; 1147f7018c21STomi Valkeinen return buf; 1148f7018c21STomi Valkeinen } 1149f7018c21STomi Valkeinen 1150f7018c21STomi Valkeinen /* 1151f7018c21STomi Valkeinen * In order to come back from full DPMS off, we need to set the mode again 1152f7018c21STomi Valkeinen */ 1153f7018c21STomi Valkeinen static int dlfb_ops_blank(int blank_mode, struct fb_info *info) 1154f7018c21STomi Valkeinen { 11557ea46206SLadislav Michl struct dlfb_data *dlfb = info->par; 1156f7018c21STomi Valkeinen char *bufptr; 1157f7018c21STomi Valkeinen struct urb *urb; 1158f7018c21STomi Valkeinen 11595865889fSLadislav Michl dev_dbg(info->dev, "blank, mode %d --> %d\n", 11605865889fSLadislav Michl dlfb->blank_mode, blank_mode); 1161f7018c21STomi Valkeinen 11627ea46206SLadislav Michl if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) && 1163f7018c21STomi Valkeinen (blank_mode != FB_BLANK_POWERDOWN)) { 1164f7018c21STomi Valkeinen 1165f7018c21STomi Valkeinen /* returning from powerdown requires a fresh modeset */ 11667ea46206SLadislav Michl dlfb_set_video_mode(dlfb, &info->var); 1167f7018c21STomi Valkeinen } 1168f7018c21STomi Valkeinen 11697ea46206SLadislav Michl urb = dlfb_get_urb(dlfb); 1170f7018c21STomi Valkeinen if (!urb) 1171f7018c21STomi Valkeinen return 0; 1172f7018c21STomi Valkeinen 1173f7018c21STomi Valkeinen bufptr = (char *) urb->transfer_buffer; 1174f7018c21STomi Valkeinen bufptr = dlfb_vidreg_lock(bufptr); 1175f7018c21STomi Valkeinen bufptr = dlfb_blanking(bufptr, blank_mode); 1176f7018c21STomi Valkeinen bufptr = dlfb_vidreg_unlock(bufptr); 1177f7018c21STomi Valkeinen 1178f7018c21STomi Valkeinen /* seems like a render op is needed to have blank change take effect */ 1179f7018c21STomi Valkeinen bufptr = dlfb_dummy_render(bufptr); 1180f7018c21STomi Valkeinen 11817ea46206SLadislav Michl dlfb_submit_urb(dlfb, urb, bufptr - 1182f7018c21STomi Valkeinen (char *) urb->transfer_buffer); 1183f7018c21STomi Valkeinen 11847ea46206SLadislav Michl dlfb->blank_mode = blank_mode; 1185f7018c21STomi Valkeinen 1186f7018c21STomi Valkeinen return 0; 1187f7018c21STomi Valkeinen } 1188f7018c21STomi Valkeinen 1189df5eff6dSNishka Dasgupta static const struct fb_ops dlfb_ops = { 1190f7018c21STomi Valkeinen .owner = THIS_MODULE, 1191f7018c21STomi Valkeinen .fb_read = fb_sys_read, 1192f7018c21STomi Valkeinen .fb_write = dlfb_ops_write, 1193f7018c21STomi Valkeinen .fb_setcolreg = dlfb_ops_setcolreg, 1194f7018c21STomi Valkeinen .fb_fillrect = dlfb_ops_fillrect, 1195f7018c21STomi Valkeinen .fb_copyarea = dlfb_ops_copyarea, 1196f7018c21STomi Valkeinen .fb_imageblit = dlfb_ops_imageblit, 1197f7018c21STomi Valkeinen .fb_mmap = dlfb_ops_mmap, 1198f7018c21STomi Valkeinen .fb_ioctl = dlfb_ops_ioctl, 1199f7018c21STomi Valkeinen .fb_open = dlfb_ops_open, 1200f7018c21STomi Valkeinen .fb_release = dlfb_ops_release, 1201f7018c21STomi Valkeinen .fb_blank = dlfb_ops_blank, 1202f7018c21STomi Valkeinen .fb_check_var = dlfb_ops_check_var, 1203f7018c21STomi Valkeinen .fb_set_par = dlfb_ops_set_par, 120468a958a9SMikulas Patocka .fb_destroy = dlfb_ops_destroy, 1205f7018c21STomi Valkeinen }; 1206f7018c21STomi Valkeinen 1207f7018c21STomi Valkeinen 12087433914eSMikulas Patocka static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem) 12097433914eSMikulas Patocka { 12107433914eSMikulas Patocka struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL); 12117433914eSMikulas Patocka if (!d) 12127433914eSMikulas Patocka return; 12137433914eSMikulas Patocka d->mem = mem; 12147433914eSMikulas Patocka list_add(&d->list, &dlfb->deferred_free); 12157433914eSMikulas Patocka } 12167433914eSMikulas Patocka 1217f7018c21STomi Valkeinen /* 1218f7018c21STomi Valkeinen * Assumes &info->lock held by caller 1219f7018c21STomi Valkeinen * Assumes no active clients have framebuffer open 1220f7018c21STomi Valkeinen */ 12217433914eSMikulas Patocka static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len) 1222f7018c21STomi Valkeinen { 12237433914eSMikulas Patocka u32 old_len = info->fix.smem_len; 12247433914eSMikulas Patocka const void *old_fb = (const void __force *)info->screen_base; 1225f7018c21STomi Valkeinen unsigned char *new_fb; 1226f7018c21STomi Valkeinen unsigned char *new_back = NULL; 1227f7018c21STomi Valkeinen 12287433914eSMikulas Patocka new_len = PAGE_ALIGN(new_len); 1229f7018c21STomi Valkeinen 12307433914eSMikulas Patocka if (new_len > old_len) { 1231f7018c21STomi Valkeinen /* 1232f7018c21STomi Valkeinen * Alloc system memory for virtual framebuffer 1233f7018c21STomi Valkeinen */ 1234f7018c21STomi Valkeinen new_fb = vmalloc(new_len); 1235f7018c21STomi Valkeinen if (!new_fb) { 12365865889fSLadislav Michl dev_err(info->dev, "Virtual framebuffer alloc failed\n"); 12373c097b06SMarkus Elfring return -ENOMEM; 1238f7018c21STomi Valkeinen } 12397433914eSMikulas Patocka memset(new_fb, 0xff, new_len); 1240f7018c21STomi Valkeinen 1241f7018c21STomi Valkeinen if (info->screen_base) { 1242f7018c21STomi Valkeinen memcpy(new_fb, old_fb, old_len); 12437433914eSMikulas Patocka dlfb_deferred_vfree(dlfb, (void __force *)info->screen_base); 1244f7018c21STomi Valkeinen } 1245f7018c21STomi Valkeinen 12467433914eSMikulas Patocka info->screen_base = (char __iomem *)new_fb; 12477433914eSMikulas Patocka info->fix.smem_len = new_len; 1248f7018c21STomi Valkeinen info->fix.smem_start = (unsigned long) new_fb; 1249f7018c21STomi Valkeinen info->flags = udlfb_info_flags; 1250f7018c21STomi Valkeinen 1251f7018c21STomi Valkeinen /* 1252f7018c21STomi Valkeinen * Second framebuffer copy to mirror the framebuffer state 1253f7018c21STomi Valkeinen * on the physical USB device. We can function without this. 1254f7018c21STomi Valkeinen * But with imperfect damage info we may send pixels over USB 1255f7018c21STomi Valkeinen * that were, in fact, unchanged - wasting limited USB bandwidth 1256f7018c21STomi Valkeinen */ 1257f7018c21STomi Valkeinen if (shadow) 1258f7018c21STomi Valkeinen new_back = vzalloc(new_len); 1259f7018c21STomi Valkeinen if (!new_back) 12605865889fSLadislav Michl dev_info(info->dev, 12615865889fSLadislav Michl "No shadow/backing buffer allocated\n"); 1262f7018c21STomi Valkeinen else { 12637433914eSMikulas Patocka dlfb_deferred_vfree(dlfb, dlfb->backing_buffer); 12647ea46206SLadislav Michl dlfb->backing_buffer = new_back; 1265f7018c21STomi Valkeinen } 1266f7018c21STomi Valkeinen } 12673c097b06SMarkus Elfring return 0; 1268f7018c21STomi Valkeinen } 1269f7018c21STomi Valkeinen 1270f7018c21STomi Valkeinen /* 1271f7018c21STomi Valkeinen * 1) Get EDID from hw, or use sw default 1272f7018c21STomi Valkeinen * 2) Parse into various fb_info structs 1273f7018c21STomi Valkeinen * 3) Allocate virtual framebuffer memory to back highest res mode 1274f7018c21STomi Valkeinen * 1275f7018c21STomi Valkeinen * Parses EDID into three places used by various parts of fbdev: 1276f7018c21STomi Valkeinen * fb_var_screeninfo contains the timing of the monitor's preferred mode 1277f7018c21STomi Valkeinen * fb_info.monspecs is full parsed EDID info, including monspecs.modedb 1278f7018c21STomi Valkeinen * fb_info.modelist is a linked list of all monitor & VESA modes which work 1279f7018c21STomi Valkeinen * 1280f7018c21STomi Valkeinen * If EDID is not readable/valid, then modelist is all VESA modes, 1281f7018c21STomi Valkeinen * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode 1282f7018c21STomi Valkeinen * Returns 0 if successful 1283f7018c21STomi Valkeinen */ 12847ea46206SLadislav Michl static int dlfb_setup_modes(struct dlfb_data *dlfb, 1285f7018c21STomi Valkeinen struct fb_info *info, 1286f7018c21STomi Valkeinen char *default_edid, size_t default_edid_size) 1287f7018c21STomi Valkeinen { 1288f7018c21STomi Valkeinen char *edid; 12895865889fSLadislav Michl int i, result = 0, tries = 3; 12905865889fSLadislav Michl struct device *dev = info->device; 12915865889fSLadislav Michl struct fb_videomode *mode; 12925865889fSLadislav Michl const struct fb_videomode *default_vmode = NULL; 1293f7018c21STomi Valkeinen 12945865889fSLadislav Michl if (info->dev) { 12955865889fSLadislav Michl /* only use mutex if info has been registered */ 1296f7018c21STomi Valkeinen mutex_lock(&info->lock); 12975865889fSLadislav Michl /* parent device is used otherwise */ 12985865889fSLadislav Michl dev = info->dev; 12995865889fSLadislav Michl } 1300f7018c21STomi Valkeinen 1301f7018c21STomi Valkeinen edid = kmalloc(EDID_LENGTH, GFP_KERNEL); 1302f7018c21STomi Valkeinen if (!edid) { 1303f7018c21STomi Valkeinen result = -ENOMEM; 1304f7018c21STomi Valkeinen goto error; 1305f7018c21STomi Valkeinen } 1306f7018c21STomi Valkeinen 1307f7018c21STomi Valkeinen fb_destroy_modelist(&info->modelist); 1308f7018c21STomi Valkeinen memset(&info->monspecs, 0, sizeof(info->monspecs)); 1309f7018c21STomi Valkeinen 1310f7018c21STomi Valkeinen /* 1311f7018c21STomi Valkeinen * Try to (re)read EDID from hardware first 1312f7018c21STomi Valkeinen * EDID data may return, but not parse as valid 1313f7018c21STomi Valkeinen * Try again a few times, in case of e.g. analog cable noise 1314f7018c21STomi Valkeinen */ 1315f7018c21STomi Valkeinen while (tries--) { 1316f7018c21STomi Valkeinen 13177ea46206SLadislav Michl i = dlfb_get_edid(dlfb, edid, EDID_LENGTH); 1318f7018c21STomi Valkeinen 1319f7018c21STomi Valkeinen if (i >= EDID_LENGTH) 1320f7018c21STomi Valkeinen fb_edid_to_monspecs(edid, &info->monspecs); 1321f7018c21STomi Valkeinen 1322f7018c21STomi Valkeinen if (info->monspecs.modedb_len > 0) { 13237ea46206SLadislav Michl dlfb->edid = edid; 13247ea46206SLadislav Michl dlfb->edid_size = i; 1325f7018c21STomi Valkeinen break; 1326f7018c21STomi Valkeinen } 1327f7018c21STomi Valkeinen } 1328f7018c21STomi Valkeinen 1329f7018c21STomi Valkeinen /* If that fails, use a previously returned EDID if available */ 1330f7018c21STomi Valkeinen if (info->monspecs.modedb_len == 0) { 13315865889fSLadislav Michl dev_err(dev, "Unable to get valid EDID from device/display\n"); 1332f7018c21STomi Valkeinen 13337ea46206SLadislav Michl if (dlfb->edid) { 13347ea46206SLadislav Michl fb_edid_to_monspecs(dlfb->edid, &info->monspecs); 1335f7018c21STomi Valkeinen if (info->monspecs.modedb_len > 0) 13365865889fSLadislav Michl dev_err(dev, "Using previously queried EDID\n"); 1337f7018c21STomi Valkeinen } 1338f7018c21STomi Valkeinen } 1339f7018c21STomi Valkeinen 1340f7018c21STomi Valkeinen /* If that fails, use the default EDID we were handed */ 1341f7018c21STomi Valkeinen if (info->monspecs.modedb_len == 0) { 1342f7018c21STomi Valkeinen if (default_edid_size >= EDID_LENGTH) { 1343f7018c21STomi Valkeinen fb_edid_to_monspecs(default_edid, &info->monspecs); 1344f7018c21STomi Valkeinen if (info->monspecs.modedb_len > 0) { 1345f7018c21STomi Valkeinen memcpy(edid, default_edid, default_edid_size); 13467ea46206SLadislav Michl dlfb->edid = edid; 13477ea46206SLadislav Michl dlfb->edid_size = default_edid_size; 13485865889fSLadislav Michl dev_err(dev, "Using default/backup EDID\n"); 1349f7018c21STomi Valkeinen } 1350f7018c21STomi Valkeinen } 1351f7018c21STomi Valkeinen } 1352f7018c21STomi Valkeinen 1353f7018c21STomi Valkeinen /* If we've got modes, let's pick a best default mode */ 1354f7018c21STomi Valkeinen if (info->monspecs.modedb_len > 0) { 1355f7018c21STomi Valkeinen 1356f7018c21STomi Valkeinen for (i = 0; i < info->monspecs.modedb_len; i++) { 13575865889fSLadislav Michl mode = &info->monspecs.modedb[i]; 13585865889fSLadislav Michl if (dlfb_is_valid_mode(mode, dlfb)) { 13595865889fSLadislav Michl fb_add_videomode(mode, &info->modelist); 13605865889fSLadislav Michl } else { 13615865889fSLadislav Michl dev_dbg(dev, "Specified mode %dx%d too big\n", 13625865889fSLadislav Michl mode->xres, mode->yres); 1363f7018c21STomi Valkeinen if (i == 0) 1364f7018c21STomi Valkeinen /* if we've removed top/best mode */ 1365f7018c21STomi Valkeinen info->monspecs.misc 1366f7018c21STomi Valkeinen &= ~FB_MISC_1ST_DETAIL; 1367f7018c21STomi Valkeinen } 1368f7018c21STomi Valkeinen } 1369f7018c21STomi Valkeinen 1370f7018c21STomi Valkeinen default_vmode = fb_find_best_display(&info->monspecs, 1371f7018c21STomi Valkeinen &info->modelist); 1372f7018c21STomi Valkeinen } 1373f7018c21STomi Valkeinen 1374f7018c21STomi Valkeinen /* If everything else has failed, fall back to safe default mode */ 1375f7018c21STomi Valkeinen if (default_vmode == NULL) { 1376f7018c21STomi Valkeinen 1377f7018c21STomi Valkeinen struct fb_videomode fb_vmode = {0}; 1378f7018c21STomi Valkeinen 1379f7018c21STomi Valkeinen /* 1380f7018c21STomi Valkeinen * Add the standard VESA modes to our modelist 1381f7018c21STomi Valkeinen * Since we don't have EDID, there may be modes that 1382f7018c21STomi Valkeinen * overspec monitor and/or are incorrect aspect ratio, etc. 1383f7018c21STomi Valkeinen * But at least the user has a chance to choose 1384f7018c21STomi Valkeinen */ 1385f7018c21STomi Valkeinen for (i = 0; i < VESA_MODEDB_SIZE; i++) { 13865865889fSLadislav Michl mode = (struct fb_videomode *)&vesa_modes[i]; 13875865889fSLadislav Michl if (dlfb_is_valid_mode(mode, dlfb)) 13885865889fSLadislav Michl fb_add_videomode(mode, &info->modelist); 13895865889fSLadislav Michl else 13905865889fSLadislav Michl dev_dbg(dev, "VESA mode %dx%d too big\n", 13915865889fSLadislav Michl mode->xres, mode->yres); 1392f7018c21STomi Valkeinen } 1393f7018c21STomi Valkeinen 1394f7018c21STomi Valkeinen /* 1395f7018c21STomi Valkeinen * default to resolution safe for projectors 1396f7018c21STomi Valkeinen * (since they are most common case without EDID) 1397f7018c21STomi Valkeinen */ 1398f7018c21STomi Valkeinen fb_vmode.xres = 800; 1399f7018c21STomi Valkeinen fb_vmode.yres = 600; 1400f7018c21STomi Valkeinen fb_vmode.refresh = 60; 1401f7018c21STomi Valkeinen default_vmode = fb_find_nearest_mode(&fb_vmode, 1402f7018c21STomi Valkeinen &info->modelist); 1403f7018c21STomi Valkeinen } 1404f7018c21STomi Valkeinen 1405f7018c21STomi Valkeinen /* If we have good mode and no active clients*/ 14067ea46206SLadislav Michl if ((default_vmode != NULL) && (dlfb->fb_count == 0)) { 1407f7018c21STomi Valkeinen 1408f7018c21STomi Valkeinen fb_videomode_to_var(&info->var, default_vmode); 1409f7018c21STomi Valkeinen dlfb_var_color_format(&info->var); 1410f7018c21STomi Valkeinen 1411f7018c21STomi Valkeinen /* 1412f7018c21STomi Valkeinen * with mode size info, we can now alloc our framebuffer. 1413f7018c21STomi Valkeinen */ 1414f7018c21STomi Valkeinen memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); 1415f7018c21STomi Valkeinen } else 1416f7018c21STomi Valkeinen result = -EINVAL; 1417f7018c21STomi Valkeinen 1418f7018c21STomi Valkeinen error: 14197ea46206SLadislav Michl if (edid && (dlfb->edid != edid)) 1420f7018c21STomi Valkeinen kfree(edid); 1421f7018c21STomi Valkeinen 1422f7018c21STomi Valkeinen if (info->dev) 1423f7018c21STomi Valkeinen mutex_unlock(&info->lock); 1424f7018c21STomi Valkeinen 1425f7018c21STomi Valkeinen return result; 1426f7018c21STomi Valkeinen } 1427f7018c21STomi Valkeinen 1428f7018c21STomi Valkeinen static ssize_t metrics_bytes_rendered_show(struct device *fbdev, 1429f7018c21STomi Valkeinen struct device_attribute *a, char *buf) { 1430f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 14317ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 143281a99828SJing Yao return sysfs_emit(buf, "%u\n", 14337ea46206SLadislav Michl atomic_read(&dlfb->bytes_rendered)); 1434f7018c21STomi Valkeinen } 1435f7018c21STomi Valkeinen 1436f7018c21STomi Valkeinen static ssize_t metrics_bytes_identical_show(struct device *fbdev, 1437f7018c21STomi Valkeinen struct device_attribute *a, char *buf) { 1438f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 14397ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 144081a99828SJing Yao return sysfs_emit(buf, "%u\n", 14417ea46206SLadislav Michl atomic_read(&dlfb->bytes_identical)); 1442f7018c21STomi Valkeinen } 1443f7018c21STomi Valkeinen 1444f7018c21STomi Valkeinen static ssize_t metrics_bytes_sent_show(struct device *fbdev, 1445f7018c21STomi Valkeinen struct device_attribute *a, char *buf) { 1446f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 14477ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 144881a99828SJing Yao return sysfs_emit(buf, "%u\n", 14497ea46206SLadislav Michl atomic_read(&dlfb->bytes_sent)); 1450f7018c21STomi Valkeinen } 1451f7018c21STomi Valkeinen 1452f7018c21STomi Valkeinen static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, 1453f7018c21STomi Valkeinen struct device_attribute *a, char *buf) { 1454f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 14557ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 145681a99828SJing Yao return sysfs_emit(buf, "%u\n", 14577ea46206SLadislav Michl atomic_read(&dlfb->cpu_kcycles_used)); 1458f7018c21STomi Valkeinen } 1459f7018c21STomi Valkeinen 1460f7018c21STomi Valkeinen static ssize_t edid_show( 1461f7018c21STomi Valkeinen struct file *filp, 1462f7018c21STomi Valkeinen struct kobject *kobj, struct bin_attribute *a, 1463f7018c21STomi Valkeinen char *buf, loff_t off, size_t count) { 14646bfea83eSkernel test robot struct device *fbdev = kobj_to_dev(kobj); 1465f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 14667ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 1467f7018c21STomi Valkeinen 14687ea46206SLadislav Michl if (dlfb->edid == NULL) 1469f7018c21STomi Valkeinen return 0; 1470f7018c21STomi Valkeinen 14717ea46206SLadislav Michl if ((off >= dlfb->edid_size) || (count > dlfb->edid_size)) 1472f7018c21STomi Valkeinen return 0; 1473f7018c21STomi Valkeinen 14747ea46206SLadislav Michl if (off + count > dlfb->edid_size) 14757ea46206SLadislav Michl count = dlfb->edid_size - off; 1476f7018c21STomi Valkeinen 14777ea46206SLadislav Michl memcpy(buf, dlfb->edid, count); 1478f7018c21STomi Valkeinen 1479f7018c21STomi Valkeinen return count; 1480f7018c21STomi Valkeinen } 1481f7018c21STomi Valkeinen 1482f7018c21STomi Valkeinen static ssize_t edid_store( 1483f7018c21STomi Valkeinen struct file *filp, 1484f7018c21STomi Valkeinen struct kobject *kobj, struct bin_attribute *a, 1485f7018c21STomi Valkeinen char *src, loff_t src_off, size_t src_size) { 14866bfea83eSkernel test robot struct device *fbdev = kobj_to_dev(kobj); 1487f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 14887ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 1489f7018c21STomi Valkeinen int ret; 1490f7018c21STomi Valkeinen 1491f7018c21STomi Valkeinen /* We only support write of entire EDID at once, no offset*/ 1492f7018c21STomi Valkeinen if ((src_size != EDID_LENGTH) || (src_off != 0)) 1493f7018c21STomi Valkeinen return -EINVAL; 1494f7018c21STomi Valkeinen 14957ea46206SLadislav Michl ret = dlfb_setup_modes(dlfb, fb_info, src, src_size); 1496f7018c21STomi Valkeinen if (ret) 1497f7018c21STomi Valkeinen return ret; 1498f7018c21STomi Valkeinen 14997ea46206SLadislav Michl if (!dlfb->edid || memcmp(src, dlfb->edid, src_size)) 1500f7018c21STomi Valkeinen return -EINVAL; 1501f7018c21STomi Valkeinen 15027433914eSMikulas Patocka ret = dlfb_ops_set_par(fb_info); 15037433914eSMikulas Patocka if (ret) 15047433914eSMikulas Patocka return ret; 15057433914eSMikulas Patocka 1506f7018c21STomi Valkeinen return src_size; 1507f7018c21STomi Valkeinen } 1508f7018c21STomi Valkeinen 1509f7018c21STomi Valkeinen static ssize_t metrics_reset_store(struct device *fbdev, 1510f7018c21STomi Valkeinen struct device_attribute *attr, 1511f7018c21STomi Valkeinen const char *buf, size_t count) 1512f7018c21STomi Valkeinen { 1513f7018c21STomi Valkeinen struct fb_info *fb_info = dev_get_drvdata(fbdev); 15147ea46206SLadislav Michl struct dlfb_data *dlfb = fb_info->par; 1515f7018c21STomi Valkeinen 15167ea46206SLadislav Michl atomic_set(&dlfb->bytes_rendered, 0); 15177ea46206SLadislav Michl atomic_set(&dlfb->bytes_identical, 0); 15187ea46206SLadislav Michl atomic_set(&dlfb->bytes_sent, 0); 15197ea46206SLadislav Michl atomic_set(&dlfb->cpu_kcycles_used, 0); 1520f7018c21STomi Valkeinen 1521f7018c21STomi Valkeinen return count; 1522f7018c21STomi Valkeinen } 1523f7018c21STomi Valkeinen 1524598b2eedSBhumika Goyal static const struct bin_attribute edid_attr = { 1525f7018c21STomi Valkeinen .attr.name = "edid", 1526f7018c21STomi Valkeinen .attr.mode = 0666, 1527f7018c21STomi Valkeinen .size = EDID_LENGTH, 1528f7018c21STomi Valkeinen .read = edid_show, 1529f7018c21STomi Valkeinen .write = edid_store 1530f7018c21STomi Valkeinen }; 1531f7018c21STomi Valkeinen 1532fa738a5cSLadislav Michl static const struct device_attribute fb_device_attrs[] = { 1533f7018c21STomi Valkeinen __ATTR_RO(metrics_bytes_rendered), 1534f7018c21STomi Valkeinen __ATTR_RO(metrics_bytes_identical), 1535f7018c21STomi Valkeinen __ATTR_RO(metrics_bytes_sent), 1536f7018c21STomi Valkeinen __ATTR_RO(metrics_cpu_kcycles_used), 1537f7018c21STomi Valkeinen __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), 1538f7018c21STomi Valkeinen }; 1539f7018c21STomi Valkeinen 1540f7018c21STomi Valkeinen /* 1541f7018c21STomi Valkeinen * This is necessary before we can communicate with the display controller. 1542f7018c21STomi Valkeinen */ 15437ea46206SLadislav Michl static int dlfb_select_std_channel(struct dlfb_data *dlfb) 1544f7018c21STomi Valkeinen { 1545f7018c21STomi Valkeinen int ret; 154645f580c4SMaksim Salau static const u8 set_def_chn[] = { 154745f580c4SMaksim Salau 0x57, 0xCD, 0xDC, 0xA7, 1548f7018c21STomi Valkeinen 0x1C, 0x88, 0x5E, 0x15, 1549f7018c21STomi Valkeinen 0x60, 0xFE, 0xC6, 0x97, 1550f7018c21STomi Valkeinen 0x16, 0x3D, 0x47, 0xF2 }; 1551f7018c21STomi Valkeinen 1552*537adba4SHelge Deller ret = usb_control_msg_send(dlfb->udev, 0, NR_USB_REQUEST_CHANNEL, 1553f7018c21STomi Valkeinen (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, 1554*537adba4SHelge Deller &set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT, 1555*537adba4SHelge Deller GFP_KERNEL); 155645f580c4SMaksim Salau 1557f7018c21STomi Valkeinen return ret; 1558f7018c21STomi Valkeinen } 1559f7018c21STomi Valkeinen 15607ea46206SLadislav Michl static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb, 15615865889fSLadislav Michl struct usb_interface *intf) 1562f7018c21STomi Valkeinen { 1563f7018c21STomi Valkeinen char *desc; 1564f7018c21STomi Valkeinen char *buf; 1565f7018c21STomi Valkeinen char *desc_end; 1566f63cb8d7SAlexey Klimov int total_len; 1567f7018c21STomi Valkeinen 1568f7018c21STomi Valkeinen buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); 1569f7018c21STomi Valkeinen if (!buf) 1570f7018c21STomi Valkeinen return false; 1571f7018c21STomi Valkeinen desc = buf; 1572f7018c21STomi Valkeinen 15735865889fSLadislav Michl total_len = usb_get_descriptor(interface_to_usbdev(intf), 1574f7018c21STomi Valkeinen 0x5f, /* vendor specific */ 1575f7018c21STomi Valkeinen 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); 1576f7018c21STomi Valkeinen 1577f7018c21STomi Valkeinen /* if not found, look in configuration descriptor */ 1578f7018c21STomi Valkeinen if (total_len < 0) { 15795865889fSLadislav Michl if (0 == usb_get_extra_descriptor(intf->cur_altsetting, 1580f7018c21STomi Valkeinen 0x5f, &desc)) 1581f7018c21STomi Valkeinen total_len = (int) desc[0]; 1582f7018c21STomi Valkeinen } 1583f7018c21STomi Valkeinen 1584f7018c21STomi Valkeinen if (total_len > 5) { 15855865889fSLadislav Michl dev_info(&intf->dev, 15865865889fSLadislav Michl "vendor descriptor length: %d data: %11ph\n", 15875865889fSLadislav Michl total_len, desc); 1588f7018c21STomi Valkeinen 1589f7018c21STomi Valkeinen if ((desc[0] != total_len) || /* descriptor length */ 1590f7018c21STomi Valkeinen (desc[1] != 0x5f) || /* vendor descriptor type */ 1591f7018c21STomi Valkeinen (desc[2] != 0x01) || /* version (2 bytes) */ 1592f7018c21STomi Valkeinen (desc[3] != 0x00) || 1593f7018c21STomi Valkeinen (desc[4] != total_len - 2)) /* length after type */ 1594f7018c21STomi Valkeinen goto unrecognized; 1595f7018c21STomi Valkeinen 1596f7018c21STomi Valkeinen desc_end = desc + total_len; 1597f7018c21STomi Valkeinen desc += 5; /* the fixed header we've already parsed */ 1598f7018c21STomi Valkeinen 1599f7018c21STomi Valkeinen while (desc < desc_end) { 1600f7018c21STomi Valkeinen u8 length; 1601f7018c21STomi Valkeinen u16 key; 1602f7018c21STomi Valkeinen 1603115e7759SLadislav Michl key = *desc++; 1604115e7759SLadislav Michl key |= (u16)*desc++ << 8; 1605115e7759SLadislav Michl length = *desc++; 1606f7018c21STomi Valkeinen 1607f7018c21STomi Valkeinen switch (key) { 1608f7018c21STomi Valkeinen case 0x0200: { /* max_area */ 1609115e7759SLadislav Michl u32 max_area = *desc++; 1610115e7759SLadislav Michl max_area |= (u32)*desc++ << 8; 1611115e7759SLadislav Michl max_area |= (u32)*desc++ << 16; 1612115e7759SLadislav Michl max_area |= (u32)*desc++ << 24; 16135865889fSLadislav Michl dev_warn(&intf->dev, 16145865889fSLadislav Michl "DL chip limited to %d pixel modes\n", 1615f7018c21STomi Valkeinen max_area); 16167ea46206SLadislav Michl dlfb->sku_pixel_limit = max_area; 1617f7018c21STomi Valkeinen break; 1618f7018c21STomi Valkeinen } 1619f7018c21STomi Valkeinen default: 1620f7018c21STomi Valkeinen break; 1621f7018c21STomi Valkeinen } 1622f7018c21STomi Valkeinen desc += length; 1623f7018c21STomi Valkeinen } 1624f7018c21STomi Valkeinen } else { 16255865889fSLadislav Michl dev_info(&intf->dev, "vendor descriptor not available (%d)\n", 16265865889fSLadislav Michl total_len); 1627f7018c21STomi Valkeinen } 1628f7018c21STomi Valkeinen 1629f7018c21STomi Valkeinen goto success; 1630f7018c21STomi Valkeinen 1631f7018c21STomi Valkeinen unrecognized: 1632f7018c21STomi Valkeinen /* allow udlfb to load for now even if firmware unrecognized */ 16335865889fSLadislav Michl dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n"); 1634f7018c21STomi Valkeinen 1635f7018c21STomi Valkeinen success: 1636f7018c21STomi Valkeinen kfree(buf); 1637f7018c21STomi Valkeinen return true; 1638f7018c21STomi Valkeinen } 1639f7018c21STomi Valkeinen 16405865889fSLadislav Michl static int dlfb_usb_probe(struct usb_interface *intf, 1641f7018c21STomi Valkeinen const struct usb_device_id *id) 1642f7018c21STomi Valkeinen { 164368a958a9SMikulas Patocka int i; 164468a958a9SMikulas Patocka const struct device_attribute *attr; 16457ea46206SLadislav Michl struct dlfb_data *dlfb; 164668a958a9SMikulas Patocka struct fb_info *info; 1647aaf7dbe0SPavel Skripkin int retval; 16485865889fSLadislav Michl struct usb_device *usbdev = interface_to_usbdev(intf); 1649ed9de4edSAlan Stern static u8 out_ep[] = {OUT_EP_NUM + USB_DIR_OUT, 0}; 1650f7018c21STomi Valkeinen 1651f7018c21STomi Valkeinen /* usb initialization */ 16527ea46206SLadislav Michl dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL); 16535865889fSLadislav Michl if (!dlfb) { 16545865889fSLadislav Michl dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__); 1655c143a559SDan Carpenter return -ENOMEM; 1656f7018c21STomi Valkeinen } 1657f7018c21STomi Valkeinen 16587433914eSMikulas Patocka INIT_LIST_HEAD(&dlfb->deferred_free); 1659f7018c21STomi Valkeinen 166068a958a9SMikulas Patocka dlfb->udev = usb_get_dev(usbdev); 16615865889fSLadislav Michl usb_set_intfdata(intf, dlfb); 1662f7018c21STomi Valkeinen 1663ed9de4edSAlan Stern if (!usb_check_bulk_endpoints(intf, out_ep)) { 1664ed9de4edSAlan Stern dev_err(&intf->dev, "Invalid DisplayLink device!\n"); 1665ed9de4edSAlan Stern retval = -EINVAL; 1666aaf7dbe0SPavel Skripkin goto error; 1667aaf7dbe0SPavel Skripkin } 1668aaf7dbe0SPavel Skripkin 16695865889fSLadislav Michl dev_dbg(&intf->dev, "console enable=%d\n", console); 16705865889fSLadislav Michl dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio); 16715865889fSLadislav Michl dev_dbg(&intf->dev, "shadow enable=%d\n", shadow); 1672f7018c21STomi Valkeinen 16737ea46206SLadislav Michl dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */ 1674f7018c21STomi Valkeinen 16755865889fSLadislav Michl if (!dlfb_parse_vendor_descriptor(dlfb, intf)) { 16765865889fSLadislav Michl dev_err(&intf->dev, 16775865889fSLadislav Michl "firmware not recognized, incompatible device?\n"); 1678aaf7dbe0SPavel Skripkin retval = -ENODEV; 1679f7018c21STomi Valkeinen goto error; 1680f7018c21STomi Valkeinen } 1681f7018c21STomi Valkeinen 1682f7018c21STomi Valkeinen if (pixel_limit) { 16835865889fSLadislav Michl dev_warn(&intf->dev, 16845865889fSLadislav Michl "DL chip limit of %d overridden to %d\n", 16857ea46206SLadislav Michl dlfb->sku_pixel_limit, pixel_limit); 16867ea46206SLadislav Michl dlfb->sku_pixel_limit = pixel_limit; 1687f7018c21STomi Valkeinen } 1688f7018c21STomi Valkeinen 1689f7018c21STomi Valkeinen 1690f7018c21STomi Valkeinen /* allocates framebuffer driver structure, not framebuffer memory */ 16917ea46206SLadislav Michl info = framebuffer_alloc(0, &dlfb->udev->dev); 1692aaf7dbe0SPavel Skripkin if (!info) { 1693aaf7dbe0SPavel Skripkin retval = -ENOMEM; 1694f7018c21STomi Valkeinen goto error; 1695aaf7dbe0SPavel Skripkin } 1696f7018c21STomi Valkeinen 16977ea46206SLadislav Michl dlfb->info = info; 16987ea46206SLadislav Michl info->par = dlfb; 16997ea46206SLadislav Michl info->pseudo_palette = dlfb->pseudo_palette; 17002c29cfc3SMikulas Patocka dlfb->ops = dlfb_ops; 17012c29cfc3SMikulas Patocka info->fbops = &dlfb->ops; 1702f7018c21STomi Valkeinen 1703babc250eSMikulas Patocka mutex_init(&dlfb->render_mutex); 17046b11f9d8SMikulas Patocka dlfb_init_damage(dlfb); 17056b11f9d8SMikulas Patocka spin_lock_init(&dlfb->damage_lock); 17066b11f9d8SMikulas Patocka INIT_WORK(&dlfb->damage_work, dlfb_damage_work); 17076b11f9d8SMikulas Patocka 170868a958a9SMikulas Patocka INIT_LIST_HEAD(&info->modelist); 170968a958a9SMikulas Patocka 171068a958a9SMikulas Patocka if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) { 171168a958a9SMikulas Patocka retval = -ENOMEM; 171268a958a9SMikulas Patocka dev_err(&intf->dev, "unable to allocate urb list\n"); 171368a958a9SMikulas Patocka goto error; 171468a958a9SMikulas Patocka } 171568a958a9SMikulas Patocka 171668a958a9SMikulas Patocka /* We don't register a new USB class. Our client interface is dlfbev */ 171768a958a9SMikulas Patocka 1718f7018c21STomi Valkeinen retval = fb_alloc_cmap(&info->cmap, 256, 0); 1719f7018c21STomi Valkeinen if (retval < 0) { 17205865889fSLadislav Michl dev_err(info->device, "cmap allocation failed: %d\n", retval); 1721f7018c21STomi Valkeinen goto error; 1722f7018c21STomi Valkeinen } 1723f7018c21STomi Valkeinen 17247ea46206SLadislav Michl retval = dlfb_setup_modes(dlfb, info, NULL, 0); 1725f7018c21STomi Valkeinen if (retval != 0) { 17265865889fSLadislav Michl dev_err(info->device, 17275865889fSLadislav Michl "unable to find common mode for display and adapter\n"); 1728f7018c21STomi Valkeinen goto error; 1729f7018c21STomi Valkeinen } 1730f7018c21STomi Valkeinen 1731f7018c21STomi Valkeinen /* ready to begin using device */ 1732f7018c21STomi Valkeinen 17337ea46206SLadislav Michl atomic_set(&dlfb->usb_active, 1); 17347ea46206SLadislav Michl dlfb_select_std_channel(dlfb); 1735f7018c21STomi Valkeinen 1736f7018c21STomi Valkeinen dlfb_ops_check_var(&info->var, info); 17377433914eSMikulas Patocka retval = dlfb_ops_set_par(info); 17387433914eSMikulas Patocka if (retval) 17397433914eSMikulas Patocka goto error; 1740f7018c21STomi Valkeinen 1741f7018c21STomi Valkeinen retval = register_framebuffer(info); 1742f7018c21STomi Valkeinen if (retval < 0) { 17435865889fSLadislav Michl dev_err(info->device, "unable to register framebuffer: %d\n", 17445865889fSLadislav Michl retval); 1745f7018c21STomi Valkeinen goto error; 1746f7018c21STomi Valkeinen } 1747f7018c21STomi Valkeinen 1748f7018c21STomi Valkeinen for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { 17495865889fSLadislav Michl attr = &fb_device_attrs[i]; 17505865889fSLadislav Michl retval = device_create_file(info->dev, attr); 17515865889fSLadislav Michl if (retval) 17525865889fSLadislav Michl dev_warn(info->device, 17535865889fSLadislav Michl "failed to create '%s' attribute: %d\n", 17545865889fSLadislav Michl attr->attr.name, retval); 1755f7018c21STomi Valkeinen } 1756f7018c21STomi Valkeinen 1757f7018c21STomi Valkeinen retval = device_create_bin_file(info->dev, &edid_attr); 17585865889fSLadislav Michl if (retval) 17595865889fSLadislav Michl dev_warn(info->device, "failed to create '%s' attribute: %d\n", 17605865889fSLadislav Michl edid_attr.attr.name, retval); 1761f7018c21STomi Valkeinen 17625865889fSLadislav Michl dev_info(info->device, 17635865889fSLadislav Michl "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n", 17645865889fSLadislav Michl dev_name(info->dev), info->var.xres, info->var.yres, 17657ea46206SLadislav Michl ((dlfb->backing_buffer) ? 1766f7018c21STomi Valkeinen info->fix.smem_len * 2 : info->fix.smem_len) >> 10); 176768a958a9SMikulas Patocka return 0; 1768f7018c21STomi Valkeinen 1769f7018c21STomi Valkeinen error: 177068a958a9SMikulas Patocka if (dlfb->info) { 177168a958a9SMikulas Patocka dlfb_ops_destroy(dlfb->info); 1772c143a559SDan Carpenter } else { 177368a958a9SMikulas Patocka usb_put_dev(dlfb->udev); 177468a958a9SMikulas Patocka kfree(dlfb); 177568a958a9SMikulas Patocka } 177668a958a9SMikulas Patocka return retval; 1777f7018c21STomi Valkeinen } 1778f7018c21STomi Valkeinen 17795865889fSLadislav Michl static void dlfb_usb_disconnect(struct usb_interface *intf) 1780f7018c21STomi Valkeinen { 17817ea46206SLadislav Michl struct dlfb_data *dlfb; 1782f7018c21STomi Valkeinen struct fb_info *info; 1783f7018c21STomi Valkeinen int i; 1784f7018c21STomi Valkeinen 17855865889fSLadislav Michl dlfb = usb_get_intfdata(intf); 17867ea46206SLadislav Michl info = dlfb->info; 1787f7018c21STomi Valkeinen 17885865889fSLadislav Michl dev_dbg(&intf->dev, "USB disconnect starting\n"); 1789f7018c21STomi Valkeinen 1790f7018c21STomi Valkeinen /* we virtualize until all fb clients release. Then we free */ 17917ea46206SLadislav Michl dlfb->virtualized = true; 1792f7018c21STomi Valkeinen 1793f7018c21STomi Valkeinen /* When non-active we'll update virtual framebuffer, but no new urbs */ 17947ea46206SLadislav Michl atomic_set(&dlfb->usb_active, 0); 1795f7018c21STomi Valkeinen 1796f7018c21STomi Valkeinen /* this function will wait for all in-flight urbs to complete */ 17977ea46206SLadislav Michl dlfb_free_urb_list(dlfb); 1798f7018c21STomi Valkeinen 1799f7018c21STomi Valkeinen /* remove udlfb's sysfs interfaces */ 1800f7018c21STomi Valkeinen for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) 1801f7018c21STomi Valkeinen device_remove_file(info->dev, &fb_device_attrs[i]); 1802f7018c21STomi Valkeinen device_remove_bin_file(info->dev, &edid_attr); 1803f7018c21STomi Valkeinen 180468a958a9SMikulas Patocka unregister_framebuffer(info); 1805f7018c21STomi Valkeinen } 1806f7018c21STomi Valkeinen 1807f7018c21STomi Valkeinen static struct usb_driver dlfb_driver = { 1808f7018c21STomi Valkeinen .name = "udlfb", 1809f7018c21STomi Valkeinen .probe = dlfb_usb_probe, 1810f7018c21STomi Valkeinen .disconnect = dlfb_usb_disconnect, 1811f7018c21STomi Valkeinen .id_table = id_table, 1812f7018c21STomi Valkeinen }; 1813f7018c21STomi Valkeinen 1814f7018c21STomi Valkeinen module_usb_driver(dlfb_driver); 1815f7018c21STomi Valkeinen 1816f7018c21STomi Valkeinen static void dlfb_urb_completion(struct urb *urb) 1817f7018c21STomi Valkeinen { 1818f7018c21STomi Valkeinen struct urb_node *unode = urb->context; 18197ea46206SLadislav Michl struct dlfb_data *dlfb = unode->dlfb; 1820f7018c21STomi Valkeinen unsigned long flags; 1821f7018c21STomi Valkeinen 18225865889fSLadislav Michl switch (urb->status) { 18235865889fSLadislav Michl case 0: 18245865889fSLadislav Michl /* success */ 18255865889fSLadislav Michl break; 18265865889fSLadislav Michl case -ECONNRESET: 18275865889fSLadislav Michl case -ENOENT: 18285865889fSLadislav Michl case -ESHUTDOWN: 1829f7018c21STomi Valkeinen /* sync/async unlink faults aren't errors */ 18305865889fSLadislav Michl break; 18315865889fSLadislav Michl default: 18325865889fSLadislav Michl dev_err(&dlfb->udev->dev, 18335865889fSLadislav Michl "%s - nonzero write bulk status received: %d\n", 1834f7018c21STomi Valkeinen __func__, urb->status); 18357ea46206SLadislav Michl atomic_set(&dlfb->lost_pixels, 1); 18365865889fSLadislav Michl break; 1837f7018c21STomi Valkeinen } 1838f7018c21STomi Valkeinen 18397ea46206SLadislav Michl urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */ 1840f7018c21STomi Valkeinen 18417ea46206SLadislav Michl spin_lock_irqsave(&dlfb->urbs.lock, flags); 18427ea46206SLadislav Michl list_add_tail(&unode->entry, &dlfb->urbs.list); 18437ea46206SLadislav Michl dlfb->urbs.available++; 18447ea46206SLadislav Michl spin_unlock_irqrestore(&dlfb->urbs.lock, flags); 1845f7018c21STomi Valkeinen 18467ea46206SLadislav Michl up(&dlfb->urbs.limit_sem); 1847f7018c21STomi Valkeinen } 1848f7018c21STomi Valkeinen 18497ea46206SLadislav Michl static void dlfb_free_urb_list(struct dlfb_data *dlfb) 1850f7018c21STomi Valkeinen { 18517ea46206SLadislav Michl int count = dlfb->urbs.count; 1852f7018c21STomi Valkeinen struct list_head *node; 1853f7018c21STomi Valkeinen struct urb_node *unode; 1854f7018c21STomi Valkeinen struct urb *urb; 1855f7018c21STomi Valkeinen 1856f7018c21STomi Valkeinen /* keep waiting and freeing, until we've got 'em all */ 1857f7018c21STomi Valkeinen while (count--) { 18589d0aa601SMikulas Patocka down(&dlfb->urbs.limit_sem); 1859f7018c21STomi Valkeinen 1860cb782a3fSMikulas Patocka spin_lock_irq(&dlfb->urbs.lock); 1861f7018c21STomi Valkeinen 18627ea46206SLadislav Michl node = dlfb->urbs.list.next; /* have reserved one with sem */ 1863f7018c21STomi Valkeinen list_del_init(node); 1864f7018c21STomi Valkeinen 1865cb782a3fSMikulas Patocka spin_unlock_irq(&dlfb->urbs.lock); 1866f7018c21STomi Valkeinen 1867f7018c21STomi Valkeinen unode = list_entry(node, struct urb_node, entry); 1868f7018c21STomi Valkeinen urb = unode->urb; 1869f7018c21STomi Valkeinen 1870f7018c21STomi Valkeinen /* Free each separately allocated piece */ 18717ea46206SLadislav Michl usb_free_coherent(urb->dev, dlfb->urbs.size, 1872f7018c21STomi Valkeinen urb->transfer_buffer, urb->transfer_dma); 1873f7018c21STomi Valkeinen usb_free_urb(urb); 1874f7018c21STomi Valkeinen kfree(node); 1875f7018c21STomi Valkeinen } 1876f7018c21STomi Valkeinen 18777ea46206SLadislav Michl dlfb->urbs.count = 0; 1878f7018c21STomi Valkeinen } 1879f7018c21STomi Valkeinen 18807ea46206SLadislav Michl static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) 1881f7018c21STomi Valkeinen { 1882f7018c21STomi Valkeinen struct urb *urb; 1883f7018c21STomi Valkeinen struct urb_node *unode; 1884f7018c21STomi Valkeinen char *buf; 1885080fb524SMikulas Patocka size_t wanted_size = count * size; 1886f7018c21STomi Valkeinen 18877ea46206SLadislav Michl spin_lock_init(&dlfb->urbs.lock); 1888f7018c21STomi Valkeinen 1889080fb524SMikulas Patocka retry: 18907ea46206SLadislav Michl dlfb->urbs.size = size; 18917ea46206SLadislav Michl INIT_LIST_HEAD(&dlfb->urbs.list); 1892f7018c21STomi Valkeinen 1893080fb524SMikulas Patocka sema_init(&dlfb->urbs.limit_sem, 0); 1894080fb524SMikulas Patocka dlfb->urbs.count = 0; 1895080fb524SMikulas Patocka dlfb->urbs.available = 0; 1896080fb524SMikulas Patocka 1897080fb524SMikulas Patocka while (dlfb->urbs.count * size < wanted_size) { 189874fb2519SMarkus Elfring unode = kzalloc(sizeof(*unode), GFP_KERNEL); 1899f7018c21STomi Valkeinen if (!unode) 1900f7018c21STomi Valkeinen break; 19017ea46206SLadislav Michl unode->dlfb = dlfb; 1902f7018c21STomi Valkeinen 1903f7018c21STomi Valkeinen urb = usb_alloc_urb(0, GFP_KERNEL); 1904f7018c21STomi Valkeinen if (!urb) { 1905f7018c21STomi Valkeinen kfree(unode); 1906f7018c21STomi Valkeinen break; 1907f7018c21STomi Valkeinen } 1908f7018c21STomi Valkeinen unode->urb = urb; 1909f7018c21STomi Valkeinen 1910080fb524SMikulas Patocka buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, 1911f7018c21STomi Valkeinen &urb->transfer_dma); 1912f7018c21STomi Valkeinen if (!buf) { 1913f7018c21STomi Valkeinen kfree(unode); 1914f7018c21STomi Valkeinen usb_free_urb(urb); 1915080fb524SMikulas Patocka if (size > PAGE_SIZE) { 1916080fb524SMikulas Patocka size /= 2; 1917080fb524SMikulas Patocka dlfb_free_urb_list(dlfb); 1918080fb524SMikulas Patocka goto retry; 1919080fb524SMikulas Patocka } 1920f7018c21STomi Valkeinen break; 1921f7018c21STomi Valkeinen } 1922f7018c21STomi Valkeinen 1923f7018c21STomi Valkeinen /* urb->transfer_buffer_length set to actual before submit */ 1924ed9de4edSAlan Stern usb_fill_bulk_urb(urb, dlfb->udev, 1925ed9de4edSAlan Stern usb_sndbulkpipe(dlfb->udev, OUT_EP_NUM), 1926f7018c21STomi Valkeinen buf, size, dlfb_urb_completion, unode); 1927f7018c21STomi Valkeinen urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 1928f7018c21STomi Valkeinen 19297ea46206SLadislav Michl list_add_tail(&unode->entry, &dlfb->urbs.list); 1930f7018c21STomi Valkeinen 1931080fb524SMikulas Patocka up(&dlfb->urbs.limit_sem); 1932080fb524SMikulas Patocka dlfb->urbs.count++; 1933080fb524SMikulas Patocka dlfb->urbs.available++; 1934f7018c21STomi Valkeinen } 1935f7018c21STomi Valkeinen 1936080fb524SMikulas Patocka return dlfb->urbs.count; 1937f7018c21STomi Valkeinen } 1938f7018c21STomi Valkeinen 19397ea46206SLadislav Michl static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) 1940f7018c21STomi Valkeinen { 1941f63cb8d7SAlexey Klimov int ret; 1942f7018c21STomi Valkeinen struct list_head *entry; 1943f7018c21STomi Valkeinen struct urb_node *unode; 1944f7018c21STomi Valkeinen 1945f7018c21STomi Valkeinen /* Wait for an in-flight buffer to complete and get re-queued */ 19467ea46206SLadislav Michl ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); 1947f7018c21STomi Valkeinen if (ret) { 19487ea46206SLadislav Michl atomic_set(&dlfb->lost_pixels, 1); 19495865889fSLadislav Michl dev_warn(&dlfb->udev->dev, 19505865889fSLadislav Michl "wait for urb interrupted: %d available: %d\n", 19517ea46206SLadislav Michl ret, dlfb->urbs.available); 1952acea8d5fSLadislav Michl return NULL; 1953f7018c21STomi Valkeinen } 1954f7018c21STomi Valkeinen 1955cb782a3fSMikulas Patocka spin_lock_irq(&dlfb->urbs.lock); 1956f7018c21STomi Valkeinen 19577ea46206SLadislav Michl BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ 19587ea46206SLadislav Michl entry = dlfb->urbs.list.next; 1959f7018c21STomi Valkeinen list_del_init(entry); 19607ea46206SLadislav Michl dlfb->urbs.available--; 1961f7018c21STomi Valkeinen 1962cb782a3fSMikulas Patocka spin_unlock_irq(&dlfb->urbs.lock); 1963f7018c21STomi Valkeinen 1964f7018c21STomi Valkeinen unode = list_entry(entry, struct urb_node, entry); 1965acea8d5fSLadislav Michl return unode->urb; 1966f7018c21STomi Valkeinen } 1967f7018c21STomi Valkeinen 19687ea46206SLadislav Michl static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len) 1969f7018c21STomi Valkeinen { 1970f7018c21STomi Valkeinen int ret; 1971f7018c21STomi Valkeinen 19727ea46206SLadislav Michl BUG_ON(len > dlfb->urbs.size); 1973f7018c21STomi Valkeinen 1974f7018c21STomi Valkeinen urb->transfer_buffer_length = len; /* set to actual payload len */ 1975f7018c21STomi Valkeinen ret = usb_submit_urb(urb, GFP_KERNEL); 1976f7018c21STomi Valkeinen if (ret) { 1977f7018c21STomi Valkeinen dlfb_urb_completion(urb); /* because no one else will */ 19787ea46206SLadislav Michl atomic_set(&dlfb->lost_pixels, 1); 19795865889fSLadislav Michl dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret); 1980f7018c21STomi Valkeinen } 1981f7018c21STomi Valkeinen return ret; 1982f7018c21STomi Valkeinen } 1983f7018c21STomi Valkeinen 1984f7018c21STomi Valkeinen module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1985f7018c21STomi Valkeinen MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); 1986f7018c21STomi Valkeinen 1987f7018c21STomi Valkeinen module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1988f7018c21STomi Valkeinen MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); 1989f7018c21STomi Valkeinen 1990f7018c21STomi Valkeinen module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1991f7018c21STomi Valkeinen MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); 1992f7018c21STomi Valkeinen 1993f7018c21STomi Valkeinen module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); 1994f7018c21STomi Valkeinen MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); 1995f7018c21STomi Valkeinen 1996f7018c21STomi Valkeinen MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " 1997f7018c21STomi Valkeinen "Jaya Kumar <jayakumar.lkml@gmail.com>, " 1998f7018c21STomi Valkeinen "Bernie Thompson <bernie@plugable.com>"); 1999f7018c21STomi Valkeinen MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); 2000f7018c21STomi Valkeinen MODULE_LICENSE("GPL"); 2001f7018c21STomi Valkeinen 2002