1 /* 2 * Novena video output support 3 * 4 * IT6251 code based on code Copyright (C) 2014 Sean Cross 5 * from https://github.com/xobs/novena-linux.git commit 6 * 3d85836ee1377d445531928361809612aa0a18db 7 * 8 * Copyright (C) 2014 Marek Vasut <marex@denx.de> 9 * 10 * SPDX-License-Identifier: GPL-2.0+ 11 */ 12 13 #include <common.h> 14 #include <linux/errno.h> 15 #include <asm/gpio.h> 16 #include <asm/io.h> 17 #include <asm/arch/clock.h> 18 #include <asm/arch/crm_regs.h> 19 #include <asm/arch/imx-regs.h> 20 #include <asm/arch/iomux.h> 21 #include <asm/arch/mxc_hdmi.h> 22 #include <asm/arch/sys_proto.h> 23 #include <asm/mach-imx/iomux-v3.h> 24 #include <asm/mach-imx/mxc_i2c.h> 25 #include <asm/mach-imx/video.h> 26 #include <i2c.h> 27 #include <input.h> 28 #include <ipu_pixfmt.h> 29 #include <linux/fb.h> 30 #include <linux/input.h> 31 #include <malloc.h> 32 #include <stdio_dev.h> 33 34 #include "novena.h" 35 36 #define IT6251_VENDOR_ID_LOW 0x00 37 #define IT6251_VENDOR_ID_HIGH 0x01 38 #define IT6251_DEVICE_ID_LOW 0x02 39 #define IT6251_DEVICE_ID_HIGH 0x03 40 #define IT6251_SYSTEM_STATUS 0x0d 41 #define IT6251_SYSTEM_STATUS_RINTSTATUS (1 << 0) 42 #define IT6251_SYSTEM_STATUS_RHPDSTATUS (1 << 1) 43 #define IT6251_SYSTEM_STATUS_RVIDEOSTABLE (1 << 2) 44 #define IT6251_SYSTEM_STATUS_RPLL_IOLOCK (1 << 3) 45 #define IT6251_SYSTEM_STATUS_RPLL_XPLOCK (1 << 4) 46 #define IT6251_SYSTEM_STATUS_RPLL_SPLOCK (1 << 5) 47 #define IT6251_SYSTEM_STATUS_RAUXFREQ_LOCK (1 << 6) 48 #define IT6251_REF_STATE 0x0e 49 #define IT6251_REF_STATE_MAIN_LINK_DISABLED (1 << 0) 50 #define IT6251_REF_STATE_AUX_CHANNEL_READ (1 << 1) 51 #define IT6251_REF_STATE_CR_PATTERN (1 << 2) 52 #define IT6251_REF_STATE_EQ_PATTERN (1 << 3) 53 #define IT6251_REF_STATE_NORMAL_OPERATION (1 << 4) 54 #define IT6251_REF_STATE_MUTED (1 << 5) 55 56 #define IT6251_REG_PCLK_CNT_LOW 0x57 57 #define IT6251_REG_PCLK_CNT_HIGH 0x58 58 59 #define IT6521_RETRY_MAX 20 60 61 static int it6251_is_stable(void) 62 { 63 const unsigned int caddr = NOVENA_IT6251_CHIPADDR; 64 const unsigned int laddr = NOVENA_IT6251_LVDSADDR; 65 int status; 66 int clkcnt; 67 int rpclkcnt; 68 int refstate; 69 70 rpclkcnt = (i2c_reg_read(caddr, 0x13) & 0xff) | 71 ((i2c_reg_read(caddr, 0x14) << 8) & 0x0f00); 72 debug("RPCLKCnt: %d\n", rpclkcnt); 73 74 status = i2c_reg_read(caddr, IT6251_SYSTEM_STATUS); 75 debug("System status: 0x%02x\n", status); 76 77 clkcnt = (i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_LOW) & 0xff) | 78 ((i2c_reg_read(laddr, IT6251_REG_PCLK_CNT_HIGH) << 8) & 79 0x0f00); 80 debug("Clock: 0x%02x\n", clkcnt); 81 82 refstate = i2c_reg_read(laddr, IT6251_REF_STATE); 83 debug("Ref Link State: 0x%02x\n", refstate); 84 85 if ((refstate & 0x1f) != 0) 86 return 0; 87 88 /* If video is muted, that's a failure */ 89 if (refstate & IT6251_REF_STATE_MUTED) 90 return 0; 91 92 if (!(status & IT6251_SYSTEM_STATUS_RVIDEOSTABLE)) 93 return 0; 94 95 return 1; 96 } 97 98 static int it6251_ready(void) 99 { 100 const unsigned int caddr = NOVENA_IT6251_CHIPADDR; 101 102 /* Test if the IT6251 came out of reset by reading ID regs. */ 103 if (i2c_reg_read(caddr, IT6251_VENDOR_ID_LOW) != 0x15) 104 return 0; 105 if (i2c_reg_read(caddr, IT6251_VENDOR_ID_HIGH) != 0xca) 106 return 0; 107 if (i2c_reg_read(caddr, IT6251_DEVICE_ID_LOW) != 0x51) 108 return 0; 109 if (i2c_reg_read(caddr, IT6251_DEVICE_ID_HIGH) != 0x62) 110 return 0; 111 112 return 1; 113 } 114 115 static void it6251_program_regs(void) 116 { 117 const unsigned int caddr = NOVENA_IT6251_CHIPADDR; 118 const unsigned int laddr = NOVENA_IT6251_LVDSADDR; 119 120 i2c_reg_write(caddr, 0x05, 0x00); 121 mdelay(1); 122 123 /* set LVDSRX address, and enable */ 124 i2c_reg_write(caddr, 0xfd, 0xbc); 125 i2c_reg_write(caddr, 0xfe, 0x01); 126 127 /* 128 * LVDSRX 129 */ 130 /* This write always fails, because the chip goes into reset */ 131 /* reset LVDSRX */ 132 i2c_reg_write(laddr, 0x05, 0xff); 133 i2c_reg_write(laddr, 0x05, 0x00); 134 135 /* reset LVDSRX PLL */ 136 i2c_reg_write(laddr, 0x3b, 0x42); 137 i2c_reg_write(laddr, 0x3b, 0x43); 138 139 /* something with SSC PLL */ 140 i2c_reg_write(laddr, 0x3c, 0x08); 141 /* don't swap links, but writing reserved registers */ 142 i2c_reg_write(laddr, 0x0b, 0x88); 143 144 /* JEIDA, 8-bit depth 0x11, orig 0x42 */ 145 i2c_reg_write(laddr, 0x2c, 0x01); 146 /* "reserved" */ 147 i2c_reg_write(laddr, 0x32, 0x04); 148 /* "reserved" */ 149 i2c_reg_write(laddr, 0x35, 0xe0); 150 /* "reserved" + clock delay */ 151 i2c_reg_write(laddr, 0x2b, 0x24); 152 153 /* reset LVDSRX pix clock */ 154 i2c_reg_write(laddr, 0x05, 0x02); 155 i2c_reg_write(laddr, 0x05, 0x00); 156 157 /* 158 * DPTX 159 */ 160 /* set for two lane mode, normal op, no swapping, no downspread */ 161 i2c_reg_write(caddr, 0x16, 0x02); 162 163 /* some AUX channel EDID magic */ 164 i2c_reg_write(caddr, 0x23, 0x40); 165 166 /* power down lanes 3-0 */ 167 i2c_reg_write(caddr, 0x5c, 0xf3); 168 169 /* enable DP scrambling, change EQ CR phase */ 170 i2c_reg_write(caddr, 0x5f, 0x06); 171 172 /* color mode RGB, pclk/2 */ 173 i2c_reg_write(caddr, 0x60, 0x02); 174 /* dual pixel input mode, no EO swap, no RGB swap */ 175 i2c_reg_write(caddr, 0x61, 0x04); 176 /* M444B24 video format */ 177 i2c_reg_write(caddr, 0x62, 0x01); 178 179 /* vesa range / not interlace / vsync high / hsync high */ 180 i2c_reg_write(caddr, 0xa0, 0x0F); 181 182 /* hpd event timer set to 1.6-ish ms */ 183 i2c_reg_write(caddr, 0xc9, 0xf5); 184 185 /* more reserved magic */ 186 i2c_reg_write(caddr, 0xca, 0x4d); 187 i2c_reg_write(caddr, 0xcb, 0x37); 188 189 /* enhanced framing mode, auto video fifo reset, video mute disable */ 190 i2c_reg_write(caddr, 0xd3, 0x03); 191 192 /* "vidstmp" and some reserved stuff */ 193 i2c_reg_write(caddr, 0xd4, 0x45); 194 195 /* queue number -- reserved */ 196 i2c_reg_write(caddr, 0xe7, 0xa0); 197 /* info frame packets and reserved */ 198 i2c_reg_write(caddr, 0xe8, 0x33); 199 /* more AVI stuff */ 200 i2c_reg_write(caddr, 0xec, 0x00); 201 202 /* select PC master reg for aux channel? */ 203 i2c_reg_write(caddr, 0x23, 0x42); 204 205 /* send PC request commands */ 206 i2c_reg_write(caddr, 0x24, 0x00); 207 i2c_reg_write(caddr, 0x25, 0x00); 208 i2c_reg_write(caddr, 0x26, 0x00); 209 210 /* native aux read */ 211 i2c_reg_write(caddr, 0x2b, 0x00); 212 /* back to internal */ 213 i2c_reg_write(caddr, 0x23, 0x40); 214 215 /* voltage swing level 3 */ 216 i2c_reg_write(caddr, 0x19, 0xff); 217 /* pre-emphasis level 3 */ 218 i2c_reg_write(caddr, 0x1a, 0xff); 219 220 /* start link training */ 221 i2c_reg_write(caddr, 0x17, 0x01); 222 } 223 224 static int it6251_init(void) 225 { 226 const unsigned int caddr = NOVENA_IT6251_CHIPADDR; 227 int reg; 228 int tries, retries = 0; 229 230 for (retries = 0; retries < IT6521_RETRY_MAX; retries++) { 231 /* Program the chip. */ 232 it6251_program_regs(); 233 234 /* Wait for video stable. */ 235 for (tries = 0; tries < 100; tries++) { 236 reg = i2c_reg_read(caddr, 0x17); 237 /* Test Link CFG, STS, LCS read done. */ 238 if ((reg & 0xe0) != 0xe0) { 239 /* Not yet, wait a bit more. */ 240 mdelay(2); 241 continue; 242 } 243 244 /* Test if the video input is stable. */ 245 if (it6251_is_stable()) 246 return 0; 247 } 248 /* 249 * If we couldn't stabilize, requeue and try again, 250 * because it means that the LVDS channel isn't 251 * stable yet. 252 */ 253 printf("Display didn't stabilize.\n"); 254 printf("This may be because the LVDS port is still in powersave mode.\n"); 255 mdelay(50); 256 } 257 258 return -EINVAL; 259 } 260 261 static void enable_hdmi(struct display_info_t const *dev) 262 { 263 imx_enable_hdmi_phy(); 264 } 265 266 static int lvds_enabled; 267 268 static void enable_lvds(struct display_info_t const *dev) 269 { 270 if (lvds_enabled) 271 return; 272 273 /* ITE IT6251 power enable. */ 274 gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 0); 275 mdelay(10); 276 gpio_direction_output(NOVENA_ITE6251_PWR_GPIO, 1); 277 mdelay(20); 278 lvds_enabled = 1; 279 } 280 281 static int detect_lvds(struct display_info_t const *dev) 282 { 283 int ret, loops = 250; 284 285 enable_lvds(dev); 286 287 ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS); 288 if (ret) { 289 puts("Cannot select IT6251 I2C bus.\n"); 290 return 0; 291 } 292 293 /* Wait up-to ~250 mS for the LVDS to come up. */ 294 while (--loops) { 295 ret = it6251_ready(); 296 if (ret) 297 return ret; 298 299 mdelay(1); 300 } 301 302 return 0; 303 } 304 305 struct display_info_t const displays[] = { 306 { 307 /* HDMI Output */ 308 .bus = -1, 309 .addr = 0, 310 .pixfmt = IPU_PIX_FMT_RGB24, 311 .detect = detect_hdmi, 312 .enable = enable_hdmi, 313 .mode = { 314 .name = "HDMI", 315 .refresh = 60, 316 .xres = 1024, 317 .yres = 768, 318 .pixclock = 15384, 319 .left_margin = 220, 320 .right_margin = 40, 321 .upper_margin = 21, 322 .lower_margin = 7, 323 .hsync_len = 60, 324 .vsync_len = 10, 325 .sync = FB_SYNC_EXT, 326 .vmode = FB_VMODE_NONINTERLACED 327 }, 328 }, { 329 /* LVDS Output: N133HSE-EA1 Rev. C1 */ 330 .bus = -1, 331 .pixfmt = IPU_PIX_FMT_RGB24, 332 .detect = detect_lvds, 333 .enable = enable_lvds, 334 .mode = { 335 .name = "Chimei-FHD", 336 .refresh = 60, 337 .xres = 1920, 338 .yres = 1080, 339 .pixclock = 15384, 340 .left_margin = 148, 341 .right_margin = 88, 342 .upper_margin = 36, 343 .lower_margin = 4, 344 .hsync_len = 44, 345 .vsync_len = 5, 346 .sync = FB_SYNC_HOR_HIGH_ACT | 347 FB_SYNC_VERT_HIGH_ACT | 348 FB_SYNC_EXT, 349 .vmode = FB_VMODE_NONINTERLACED, 350 }, 351 }, 352 }; 353 354 size_t display_count = ARRAY_SIZE(displays); 355 356 static void enable_vpll(void) 357 { 358 struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; 359 int timeout = 100000; 360 361 setbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN); 362 363 clrsetbits_le32(&ccm->analog_pll_video, 364 BM_ANADIG_PLL_VIDEO_DIV_SELECT | 365 BM_ANADIG_PLL_VIDEO_POST_DIV_SELECT, 366 BF_ANADIG_PLL_VIDEO_DIV_SELECT(37) | 367 BF_ANADIG_PLL_VIDEO_POST_DIV_SELECT(1)); 368 369 writel(BF_ANADIG_PLL_VIDEO_NUM_A(11), &ccm->analog_pll_video_num); 370 writel(BF_ANADIG_PLL_VIDEO_DENOM_B(12), &ccm->analog_pll_video_denom); 371 372 clrbits_le32(&ccm->analog_pll_video, BM_ANADIG_PLL_VIDEO_POWERDOWN); 373 374 while (timeout--) 375 if (readl(&ccm->analog_pll_video) & BM_ANADIG_PLL_VIDEO_LOCK) 376 break; 377 if (timeout < 0) 378 printf("Warning: video pll lock timeout!\n"); 379 380 clrsetbits_le32(&ccm->analog_pll_video, 381 BM_ANADIG_PLL_VIDEO_BYPASS, 382 BM_ANADIG_PLL_VIDEO_ENABLE); 383 } 384 385 void setup_display_clock(void) 386 { 387 struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR; 388 struct iomuxc *iomux = (struct iomuxc *)IOMUXC_BASE_ADDR; 389 390 enable_ipu_clock(); 391 enable_vpll(); 392 imx_setup_hdmi(); 393 394 /* Turn on IPU LDB DI0 clocks */ 395 setbits_le32(&mxc_ccm->CCGR3, MXC_CCM_CCGR3_LDB_DI0_MASK); 396 397 /* Switch LDB DI0 to PLL5 (Video PLL) */ 398 clrsetbits_le32(&mxc_ccm->cs2cdr, 399 MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_MASK, 400 (0 << MXC_CCM_CS2CDR_LDB_DI0_CLK_SEL_OFFSET)); 401 402 /* LDB clock div by 3.5 */ 403 clrbits_le32(&mxc_ccm->cscmr2, MXC_CCM_CSCMR2_LDB_DI0_IPU_DIV); 404 405 /* DI0 clock derived from ldb_di0_clk */ 406 clrsetbits_le32(&mxc_ccm->chsccdr, 407 MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_MASK, 408 (CHSCCDR_CLK_SEL_LDB_DI0 << 409 MXC_CCM_CHSCCDR_IPU1_DI0_CLK_SEL_OFFSET) 410 ); 411 412 /* Enable both LVDS channels, both connected to DI0. */ 413 writel(IOMUXC_GPR2_DI0_VS_POLARITY_ACTIVE_HIGH | 414 IOMUXC_GPR2_BIT_MAPPING_CH1_JEIDA | 415 IOMUXC_GPR2_DATA_WIDTH_CH1_24BIT | 416 IOMUXC_GPR2_BIT_MAPPING_CH0_JEIDA | 417 IOMUXC_GPR2_DATA_WIDTH_CH0_24BIT | 418 IOMUXC_GPR2_SPLIT_MODE_EN_MASK | 419 IOMUXC_GPR2_LVDS_CH1_MODE_ENABLED_DI0 | 420 IOMUXC_GPR2_LVDS_CH0_MODE_ENABLED_DI0, 421 &iomux->gpr[2]); 422 423 clrsetbits_le32(&iomux->gpr[3], 424 IOMUXC_GPR3_LVDS0_MUX_CTL_MASK | 425 IOMUXC_GPR3_LVDS1_MUX_CTL_MASK, 426 (IOMUXC_GPR3_MUX_SRC_IPU1_DI0 << 427 IOMUXC_GPR3_LVDS0_MUX_CTL_OFFSET) | 428 (IOMUXC_GPR3_MUX_SRC_IPU1_DI0 << 429 IOMUXC_GPR3_LVDS1_MUX_CTL_OFFSET) 430 ); 431 } 432 433 void setup_display_lvds(void) 434 { 435 int ret; 436 437 ret = i2c_set_bus_num(NOVENA_IT6251_I2C_BUS); 438 if (ret) { 439 puts("Cannot select LVDS-to-eDP I2C bus.\n"); 440 return; 441 } 442 443 /* The IT6251 should be ready now, if it's not, it's not connected. */ 444 ret = it6251_ready(); 445 if (!ret) 446 return; 447 448 /* Init the LVDS-to-eDP chip and if it succeeded, enable backlight. */ 449 ret = it6251_init(); 450 if (!ret) { 451 /* Backlight power enable. */ 452 gpio_direction_output(NOVENA_BACKLIGHT_PWR_GPIO, 1); 453 /* PWM backlight pin, always on for full brightness. */ 454 gpio_direction_output(NOVENA_BACKLIGHT_PWM_GPIO, 1); 455 } 456 } 457