1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Red Hat 4 * 5 * based in parts on udlfb.c: 6 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> 7 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> 8 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> 9 */ 10 11 #include <drm/drm_atomic.h> 12 #include <drm/drm_atomic_helper.h> 13 #include <drm/drm_crtc_helper.h> 14 #include <drm/drm_damage_helper.h> 15 #include <drm/drm_drv.h> 16 #include <drm/drm_edid.h> 17 #include <drm/drm_fourcc.h> 18 #include <drm/drm_gem_atomic_helper.h> 19 #include <drm/drm_gem_framebuffer_helper.h> 20 #include <drm/drm_gem_shmem_helper.h> 21 #include <drm/drm_modeset_helper_vtables.h> 22 #include <drm/drm_plane_helper.h> 23 #include <drm/drm_probe_helper.h> 24 #include <drm/drm_vblank.h> 25 26 #include "udl_drv.h" 27 28 #define UDL_COLOR_DEPTH_16BPP 0 29 30 /* 31 * All DisplayLink bulk operations start with 0xAF, followed by specific code 32 * All operations are written to buffers which then later get sent to device 33 */ 34 static char *udl_set_register(char *buf, u8 reg, u8 val) 35 { 36 *buf++ = 0xAF; 37 *buf++ = 0x20; 38 *buf++ = reg; 39 *buf++ = val; 40 return buf; 41 } 42 43 static char *udl_vidreg_lock(char *buf) 44 { 45 return udl_set_register(buf, 0xFF, 0x00); 46 } 47 48 static char *udl_vidreg_unlock(char *buf) 49 { 50 return udl_set_register(buf, 0xFF, 0xFF); 51 } 52 53 static char *udl_set_blank_mode(char *buf, u8 mode) 54 { 55 return udl_set_register(buf, UDL_REG_BLANK_MODE, mode); 56 } 57 58 static char *udl_set_color_depth(char *buf, u8 selection) 59 { 60 return udl_set_register(buf, 0x00, selection); 61 } 62 63 static char *udl_set_base16bpp(char *wrptr, u32 base) 64 { 65 /* the base pointer is 16 bits wide, 0x20 is hi byte. */ 66 wrptr = udl_set_register(wrptr, 0x20, base >> 16); 67 wrptr = udl_set_register(wrptr, 0x21, base >> 8); 68 return udl_set_register(wrptr, 0x22, base); 69 } 70 71 /* 72 * DisplayLink HW has separate 16bpp and 8bpp framebuffers. 73 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer 74 */ 75 static char *udl_set_base8bpp(char *wrptr, u32 base) 76 { 77 wrptr = udl_set_register(wrptr, 0x26, base >> 16); 78 wrptr = udl_set_register(wrptr, 0x27, base >> 8); 79 return udl_set_register(wrptr, 0x28, base); 80 } 81 82 static char *udl_set_register_16(char *wrptr, u8 reg, u16 value) 83 { 84 wrptr = udl_set_register(wrptr, reg, value >> 8); 85 return udl_set_register(wrptr, reg+1, value); 86 } 87 88 /* 89 * This is kind of weird because the controller takes some 90 * register values in a different byte order than other registers. 91 */ 92 static char *udl_set_register_16be(char *wrptr, u8 reg, u16 value) 93 { 94 wrptr = udl_set_register(wrptr, reg, value); 95 return udl_set_register(wrptr, reg+1, value >> 8); 96 } 97 98 /* 99 * LFSR is linear feedback shift register. The reason we have this is 100 * because the display controller needs to minimize the clock depth of 101 * various counters used in the display path. So this code reverses the 102 * provided value into the lfsr16 value by counting backwards to get 103 * the value that needs to be set in the hardware comparator to get the 104 * same actual count. This makes sense once you read above a couple of 105 * times and think about it from a hardware perspective. 106 */ 107 static u16 udl_lfsr16(u16 actual_count) 108 { 109 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ 110 111 while (actual_count--) { 112 lv = ((lv << 1) | 113 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) 114 & 0xFFFF; 115 } 116 117 return (u16) lv; 118 } 119 120 /* 121 * This does LFSR conversion on the value that is to be written. 122 * See LFSR explanation above for more detail. 123 */ 124 static char *udl_set_register_lfsr16(char *wrptr, u8 reg, u16 value) 125 { 126 return udl_set_register_16(wrptr, reg, udl_lfsr16(value)); 127 } 128 129 /* 130 * This takes a standard fbdev screeninfo struct and all of its monitor mode 131 * details and converts them into the DisplayLink equivalent register commands. 132 ERR(vreg(dev, 0x00, (color_depth == 16) ? 0 : 1)); 133 ERR(vreg_lfsr16(dev, 0x01, xDisplayStart)); 134 ERR(vreg_lfsr16(dev, 0x03, xDisplayEnd)); 135 ERR(vreg_lfsr16(dev, 0x05, yDisplayStart)); 136 ERR(vreg_lfsr16(dev, 0x07, yDisplayEnd)); 137 ERR(vreg_lfsr16(dev, 0x09, xEndCount)); 138 ERR(vreg_lfsr16(dev, 0x0B, hSyncStart)); 139 ERR(vreg_lfsr16(dev, 0x0D, hSyncEnd)); 140 ERR(vreg_big_endian(dev, 0x0F, hPixels)); 141 ERR(vreg_lfsr16(dev, 0x11, yEndCount)); 142 ERR(vreg_lfsr16(dev, 0x13, vSyncStart)); 143 ERR(vreg_lfsr16(dev, 0x15, vSyncEnd)); 144 ERR(vreg_big_endian(dev, 0x17, vPixels)); 145 ERR(vreg_little_endian(dev, 0x1B, pixelClock5KHz)); 146 147 ERR(vreg(dev, 0x1F, 0)); 148 149 ERR(vbuf(dev, WRITE_VIDREG_UNLOCK, DSIZEOF(WRITE_VIDREG_UNLOCK))); 150 */ 151 static char *udl_set_vid_cmds(char *wrptr, struct drm_display_mode *mode) 152 { 153 u16 xds, yds; 154 u16 xde, yde; 155 u16 yec; 156 157 /* x display start */ 158 xds = mode->crtc_htotal - mode->crtc_hsync_start; 159 wrptr = udl_set_register_lfsr16(wrptr, 0x01, xds); 160 /* x display end */ 161 xde = xds + mode->crtc_hdisplay; 162 wrptr = udl_set_register_lfsr16(wrptr, 0x03, xde); 163 164 /* y display start */ 165 yds = mode->crtc_vtotal - mode->crtc_vsync_start; 166 wrptr = udl_set_register_lfsr16(wrptr, 0x05, yds); 167 /* y display end */ 168 yde = yds + mode->crtc_vdisplay; 169 wrptr = udl_set_register_lfsr16(wrptr, 0x07, yde); 170 171 /* x end count is active + blanking - 1 */ 172 wrptr = udl_set_register_lfsr16(wrptr, 0x09, 173 mode->crtc_htotal - 1); 174 175 /* libdlo hardcodes hsync start to 1 */ 176 wrptr = udl_set_register_lfsr16(wrptr, 0x0B, 1); 177 178 /* hsync end is width of sync pulse + 1 */ 179 wrptr = udl_set_register_lfsr16(wrptr, 0x0D, 180 mode->crtc_hsync_end - mode->crtc_hsync_start + 1); 181 182 /* hpixels is active pixels */ 183 wrptr = udl_set_register_16(wrptr, 0x0F, mode->hdisplay); 184 185 /* yendcount is vertical active + vertical blanking */ 186 yec = mode->crtc_vtotal; 187 wrptr = udl_set_register_lfsr16(wrptr, 0x11, yec); 188 189 /* libdlo hardcodes vsync start to 0 */ 190 wrptr = udl_set_register_lfsr16(wrptr, 0x13, 0); 191 192 /* vsync end is width of vsync pulse */ 193 wrptr = udl_set_register_lfsr16(wrptr, 0x15, mode->crtc_vsync_end - mode->crtc_vsync_start); 194 195 /* vpixels is active pixels */ 196 wrptr = udl_set_register_16(wrptr, 0x17, mode->crtc_vdisplay); 197 198 wrptr = udl_set_register_16be(wrptr, 0x1B, 199 mode->clock / 5); 200 201 return wrptr; 202 } 203 204 static char *udl_dummy_render(char *wrptr) 205 { 206 *wrptr++ = 0xAF; 207 *wrptr++ = 0x6A; /* copy */ 208 *wrptr++ = 0x00; /* from addr */ 209 *wrptr++ = 0x00; 210 *wrptr++ = 0x00; 211 *wrptr++ = 0x01; /* one pixel */ 212 *wrptr++ = 0x00; /* to address */ 213 *wrptr++ = 0x00; 214 *wrptr++ = 0x00; 215 return wrptr; 216 } 217 218 static long udl_log_cpp(unsigned int cpp) 219 { 220 if (WARN_ON(!is_power_of_2(cpp))) 221 return -EINVAL; 222 return __ffs(cpp); 223 } 224 225 static int udl_handle_damage(struct drm_framebuffer *fb, 226 const struct iosys_map *map, 227 const struct drm_rect *clip) 228 { 229 struct drm_device *dev = fb->dev; 230 void *vaddr = map->vaddr; /* TODO: Use mapping abstraction properly */ 231 int i, ret; 232 char *cmd; 233 struct urb *urb; 234 int log_bpp; 235 236 ret = udl_log_cpp(fb->format->cpp[0]); 237 if (ret < 0) 238 return ret; 239 log_bpp = ret; 240 241 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); 242 if (ret) 243 return ret; 244 245 urb = udl_get_urb(dev); 246 if (!urb) { 247 ret = -ENOMEM; 248 goto out_drm_gem_fb_end_cpu_access; 249 } 250 cmd = urb->transfer_buffer; 251 252 for (i = clip->y1; i < clip->y2; i++) { 253 const int line_offset = fb->pitches[0] * i; 254 const int byte_offset = line_offset + (clip->x1 << log_bpp); 255 const int dev_byte_offset = (fb->width * i + clip->x1) << log_bpp; 256 const int byte_width = drm_rect_width(clip) << log_bpp; 257 ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr, 258 &cmd, byte_offset, dev_byte_offset, 259 byte_width); 260 if (ret) 261 goto out_drm_gem_fb_end_cpu_access; 262 } 263 264 if (cmd > (char *)urb->transfer_buffer) { 265 /* Send partial buffer remaining before exiting */ 266 int len; 267 if (cmd < (char *)urb->transfer_buffer + urb->transfer_buffer_length) 268 *cmd++ = 0xAF; 269 len = cmd - (char *)urb->transfer_buffer; 270 ret = udl_submit_urb(dev, urb, len); 271 } else { 272 udl_urb_completion(urb); 273 } 274 275 ret = 0; 276 277 out_drm_gem_fb_end_cpu_access: 278 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); 279 return ret; 280 } 281 282 /* 283 * Primary plane 284 */ 285 286 static const uint32_t udl_primary_plane_formats[] = { 287 DRM_FORMAT_RGB565, 288 DRM_FORMAT_XRGB8888, 289 }; 290 291 static const uint64_t udl_primary_plane_fmtmods[] = { 292 DRM_FORMAT_MOD_LINEAR, 293 DRM_FORMAT_MOD_INVALID 294 }; 295 296 static void udl_primary_plane_helper_atomic_update(struct drm_plane *plane, 297 struct drm_atomic_state *state) 298 { 299 struct drm_device *dev = plane->dev; 300 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane); 301 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); 302 struct drm_framebuffer *fb = plane_state->fb; 303 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane); 304 struct drm_rect rect; 305 int idx; 306 307 if (!drm_dev_enter(dev, &idx)) 308 return; 309 310 if (!fb) 311 return; /* no framebuffer; plane is disabled */ 312 313 if (drm_atomic_helper_damage_merged(old_plane_state, plane_state, &rect)) 314 udl_handle_damage(fb, &shadow_plane_state->data[0], &rect); 315 316 drm_dev_exit(idx); 317 } 318 319 static const struct drm_plane_helper_funcs udl_primary_plane_helper_funcs = { 320 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS, 321 .atomic_check = drm_plane_helper_atomic_check, 322 .atomic_update = udl_primary_plane_helper_atomic_update, 323 }; 324 325 static const struct drm_plane_funcs udl_primary_plane_funcs = { 326 .update_plane = drm_atomic_helper_update_plane, 327 .disable_plane = drm_atomic_helper_disable_plane, 328 .destroy = drm_plane_cleanup, 329 DRM_GEM_SHADOW_PLANE_FUNCS, 330 }; 331 332 /* 333 * CRTC 334 */ 335 336 static int udl_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state) 337 { 338 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 339 340 return drm_atomic_helper_check_crtc_state(new_crtc_state, false); 341 } 342 343 static void udl_crtc_helper_atomic_enable(struct drm_crtc *crtc, struct drm_atomic_state *state) 344 { 345 struct drm_device *dev = crtc->dev; 346 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 347 struct drm_display_mode *mode = &crtc_state->mode; 348 struct urb *urb; 349 char *buf; 350 int idx; 351 352 if (!drm_dev_enter(dev, &idx)) 353 return; 354 355 urb = udl_get_urb(dev); 356 if (!urb) 357 goto out; 358 359 buf = (char *)urb->transfer_buffer; 360 buf = udl_vidreg_lock(buf); 361 buf = udl_set_color_depth(buf, UDL_COLOR_DEPTH_16BPP); 362 /* set base for 16bpp segment to 0 */ 363 buf = udl_set_base16bpp(buf, 0); 364 /* set base for 8bpp segment to end of fb */ 365 buf = udl_set_base8bpp(buf, 2 * mode->vdisplay * mode->hdisplay); 366 buf = udl_set_vid_cmds(buf, mode); 367 buf = udl_set_blank_mode(buf, UDL_BLANK_MODE_ON); 368 buf = udl_vidreg_unlock(buf); 369 buf = udl_dummy_render(buf); 370 371 udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer); 372 373 out: 374 drm_dev_exit(idx); 375 } 376 377 static void udl_crtc_helper_atomic_disable(struct drm_crtc *crtc, struct drm_atomic_state *state) 378 { 379 struct drm_device *dev = crtc->dev; 380 struct urb *urb; 381 char *buf; 382 int idx; 383 384 if (!drm_dev_enter(dev, &idx)) 385 return; 386 387 urb = udl_get_urb(dev); 388 if (!urb) 389 goto out; 390 391 buf = (char *)urb->transfer_buffer; 392 buf = udl_vidreg_lock(buf); 393 buf = udl_set_blank_mode(buf, UDL_BLANK_MODE_POWERDOWN); 394 buf = udl_vidreg_unlock(buf); 395 buf = udl_dummy_render(buf); 396 397 udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer); 398 399 out: 400 drm_dev_exit(idx); 401 } 402 403 static const struct drm_crtc_helper_funcs udl_crtc_helper_funcs = { 404 .atomic_check = udl_crtc_helper_atomic_check, 405 .atomic_enable = udl_crtc_helper_atomic_enable, 406 .atomic_disable = udl_crtc_helper_atomic_disable, 407 }; 408 409 static const struct drm_crtc_funcs udl_crtc_funcs = { 410 .reset = drm_atomic_helper_crtc_reset, 411 .destroy = drm_crtc_cleanup, 412 .set_config = drm_atomic_helper_set_config, 413 .page_flip = drm_atomic_helper_page_flip, 414 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 415 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 416 }; 417 418 /* 419 * Encoder 420 */ 421 422 static const struct drm_encoder_funcs udl_encoder_funcs = { 423 .destroy = drm_encoder_cleanup, 424 }; 425 426 /* 427 * Connector 428 */ 429 430 static int udl_connector_helper_get_modes(struct drm_connector *connector) 431 { 432 struct udl_connector *udl_connector = to_udl_connector(connector); 433 434 drm_connector_update_edid_property(connector, udl_connector->edid); 435 if (udl_connector->edid) 436 return drm_add_edid_modes(connector, udl_connector->edid); 437 438 return 0; 439 } 440 441 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = { 442 .get_modes = udl_connector_helper_get_modes, 443 }; 444 445 static int udl_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len) 446 { 447 struct udl_device *udl = data; 448 struct drm_device *dev = &udl->drm; 449 struct usb_device *udev = udl_to_usb_device(udl); 450 u8 *read_buff; 451 int ret; 452 size_t i; 453 454 read_buff = kmalloc(2, GFP_KERNEL); 455 if (!read_buff) 456 return -ENOMEM; 457 458 for (i = 0; i < len; i++) { 459 int bval = (i + block * EDID_LENGTH) << 8; 460 461 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 462 0x02, (0x80 | (0x02 << 5)), bval, 463 0xA1, read_buff, 2, USB_CTRL_GET_TIMEOUT); 464 if (ret < 0) { 465 drm_err(dev, "Read EDID byte %zu failed err %x\n", i, ret); 466 goto err_kfree; 467 } else if (ret < 1) { 468 ret = -EIO; 469 drm_err(dev, "Read EDID byte %zu failed\n", i); 470 goto err_kfree; 471 } 472 473 buf[i] = read_buff[1]; 474 } 475 476 kfree(read_buff); 477 478 return 0; 479 480 err_kfree: 481 kfree(read_buff); 482 return ret; 483 } 484 485 static enum drm_connector_status udl_connector_detect(struct drm_connector *connector, bool force) 486 { 487 struct drm_device *dev = connector->dev; 488 struct udl_device *udl = to_udl(dev); 489 struct udl_connector *udl_connector = to_udl_connector(connector); 490 enum drm_connector_status status = connector_status_disconnected; 491 int idx; 492 493 /* cleanup previous EDID */ 494 kfree(udl_connector->edid); 495 udl_connector->edid = NULL; 496 497 if (!drm_dev_enter(dev, &idx)) 498 return connector_status_disconnected; 499 500 udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl); 501 if (udl_connector->edid) 502 status = connector_status_connected; 503 504 drm_dev_exit(idx); 505 506 return status; 507 } 508 509 static void udl_connector_destroy(struct drm_connector *connector) 510 { 511 struct udl_connector *udl_connector = to_udl_connector(connector); 512 513 drm_connector_cleanup(connector); 514 kfree(udl_connector->edid); 515 kfree(udl_connector); 516 } 517 518 static const struct drm_connector_funcs udl_connector_funcs = { 519 .reset = drm_atomic_helper_connector_reset, 520 .detect = udl_connector_detect, 521 .fill_modes = drm_helper_probe_single_connector_modes, 522 .destroy = udl_connector_destroy, 523 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 524 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 525 }; 526 527 struct drm_connector *udl_connector_init(struct drm_device *dev) 528 { 529 struct udl_connector *udl_connector; 530 struct drm_connector *connector; 531 int ret; 532 533 udl_connector = kzalloc(sizeof(*udl_connector), GFP_KERNEL); 534 if (!udl_connector) 535 return ERR_PTR(-ENOMEM); 536 537 connector = &udl_connector->connector; 538 ret = drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_VGA); 539 if (ret) 540 goto err_kfree; 541 542 drm_connector_helper_add(connector, &udl_connector_helper_funcs); 543 544 connector->polled = DRM_CONNECTOR_POLL_HPD | 545 DRM_CONNECTOR_POLL_CONNECT | 546 DRM_CONNECTOR_POLL_DISCONNECT; 547 548 return connector; 549 550 err_kfree: 551 kfree(udl_connector); 552 return ERR_PTR(ret); 553 } 554 555 /* 556 * Modesetting 557 */ 558 559 static enum drm_mode_status udl_mode_config_mode_valid(struct drm_device *dev, 560 const struct drm_display_mode *mode) 561 { 562 struct udl_device *udl = to_udl(dev); 563 564 if (udl->sku_pixel_limit) { 565 if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit) 566 return MODE_MEM; 567 } 568 569 return MODE_OK; 570 } 571 572 static const struct drm_mode_config_funcs udl_mode_config_funcs = { 573 .fb_create = drm_gem_fb_create_with_dirty, 574 .mode_valid = udl_mode_config_mode_valid, 575 .atomic_check = drm_atomic_helper_check, 576 .atomic_commit = drm_atomic_helper_commit, 577 }; 578 579 int udl_modeset_init(struct drm_device *dev) 580 { 581 struct udl_device *udl = to_udl(dev); 582 struct drm_plane *primary_plane; 583 struct drm_crtc *crtc; 584 struct drm_encoder *encoder; 585 struct drm_connector *connector; 586 int ret; 587 588 ret = drmm_mode_config_init(dev); 589 if (ret) 590 return ret; 591 592 dev->mode_config.min_width = 640; 593 dev->mode_config.min_height = 480; 594 dev->mode_config.max_width = 2048; 595 dev->mode_config.max_height = 2048; 596 dev->mode_config.preferred_depth = 16; 597 dev->mode_config.funcs = &udl_mode_config_funcs; 598 599 primary_plane = &udl->primary_plane; 600 ret = drm_universal_plane_init(dev, primary_plane, 0, 601 &udl_primary_plane_funcs, 602 udl_primary_plane_formats, 603 ARRAY_SIZE(udl_primary_plane_formats), 604 udl_primary_plane_fmtmods, 605 DRM_PLANE_TYPE_PRIMARY, NULL); 606 if (ret) 607 return ret; 608 drm_plane_helper_add(primary_plane, &udl_primary_plane_helper_funcs); 609 drm_plane_enable_fb_damage_clips(primary_plane); 610 611 crtc = &udl->crtc; 612 ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL, 613 &udl_crtc_funcs, NULL); 614 if (ret) 615 return ret; 616 drm_crtc_helper_add(crtc, &udl_crtc_helper_funcs); 617 618 encoder = &udl->encoder; 619 ret = drm_encoder_init(dev, encoder, &udl_encoder_funcs, DRM_MODE_ENCODER_DAC, NULL); 620 if (ret) 621 return ret; 622 encoder->possible_crtcs = drm_crtc_mask(crtc); 623 624 connector = udl_connector_init(dev); 625 if (IS_ERR(connector)) 626 return PTR_ERR(connector); 627 ret = drm_connector_attach_encoder(connector, encoder); 628 if (ret) 629 return ret; 630 631 drm_mode_config_reset(dev); 632 633 return 0; 634 } 635