1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * TC358767/TC358867/TC9595 DSI/DPI-to-DPI/(e)DP bridge driver 4 * 5 * The TC358767/TC358867/TC9595 can operate in multiple modes. 6 * All modes are supported -- DPI->(e)DP / DSI->DPI / DSI->(e)DP . 7 * 8 * Copyright (C) 2016 CogentEmbedded Inc 9 * Author: Andrey Gusakov <andrey.gusakov@cogentembedded.com> 10 * 11 * Copyright (C) 2016 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> 12 * 13 * Copyright (C) 2016 Zodiac Inflight Innovations 14 * 15 * Initially based on: drivers/gpu/drm/i2c/tda998x_drv.c 16 * 17 * Copyright (C) 2012 Texas Instruments 18 * Author: Rob Clark <robdclark@gmail.com> 19 */ 20 21 #include <linux/bitfield.h> 22 #include <linux/clk.h> 23 #include <linux/device.h> 24 #include <linux/gpio/consumer.h> 25 #include <linux/i2c.h> 26 #include <linux/kernel.h> 27 #include <linux/media-bus-format.h> 28 #include <linux/module.h> 29 #include <linux/regmap.h> 30 #include <linux/slab.h> 31 32 #include <drm/display/drm_dp_helper.h> 33 #include <drm/drm_atomic_helper.h> 34 #include <drm/drm_bridge.h> 35 #include <drm/drm_edid.h> 36 #include <drm/drm_mipi_dsi.h> 37 #include <drm/drm_of.h> 38 #include <drm/drm_panel.h> 39 #include <drm/drm_print.h> 40 #include <drm/drm_probe_helper.h> 41 42 /* Registers */ 43 44 /* PPI layer registers */ 45 #define PPI_STARTPPI 0x0104 /* START control bit */ 46 #define PPI_LPTXTIMECNT 0x0114 /* LPTX timing signal */ 47 #define LPX_PERIOD 3 48 #define PPI_LANEENABLE 0x0134 49 #define PPI_TX_RX_TA 0x013c 50 #define TTA_GET 0x40000 51 #define TTA_SURE 6 52 #define PPI_D0S_ATMR 0x0144 53 #define PPI_D1S_ATMR 0x0148 54 #define PPI_D0S_CLRSIPOCOUNT 0x0164 /* Assertion timer for Lane 0 */ 55 #define PPI_D1S_CLRSIPOCOUNT 0x0168 /* Assertion timer for Lane 1 */ 56 #define PPI_D2S_CLRSIPOCOUNT 0x016c /* Assertion timer for Lane 2 */ 57 #define PPI_D3S_CLRSIPOCOUNT 0x0170 /* Assertion timer for Lane 3 */ 58 #define PPI_START_FUNCTION BIT(0) 59 60 /* DSI layer registers */ 61 #define DSI_STARTDSI 0x0204 /* START control bit of DSI-TX */ 62 #define DSI_LANEENABLE 0x0210 /* Enables each lane */ 63 #define DSI_RX_START BIT(0) 64 65 /* Lane enable PPI and DSI register bits */ 66 #define LANEENABLE_CLEN BIT(0) 67 #define LANEENABLE_L0EN BIT(1) 68 #define LANEENABLE_L1EN BIT(2) 69 #define LANEENABLE_L2EN BIT(1) 70 #define LANEENABLE_L3EN BIT(2) 71 72 /* Display Parallel Input Interface */ 73 #define DPIPXLFMT 0x0440 74 #define VS_POL_ACTIVE_LOW (1 << 10) 75 #define HS_POL_ACTIVE_LOW (1 << 9) 76 #define DE_POL_ACTIVE_HIGH (0 << 8) 77 #define SUB_CFG_TYPE_CONFIG1 (0 << 2) /* LSB aligned */ 78 #define SUB_CFG_TYPE_CONFIG2 (1 << 2) /* Loosely Packed */ 79 #define SUB_CFG_TYPE_CONFIG3 (2 << 2) /* LSB aligned 8-bit */ 80 #define DPI_BPP_RGB888 (0 << 0) 81 #define DPI_BPP_RGB666 (1 << 0) 82 #define DPI_BPP_RGB565 (2 << 0) 83 84 /* Display Parallel Output Interface */ 85 #define POCTRL 0x0448 86 #define POCTRL_S2P BIT(7) 87 #define POCTRL_PCLK_POL BIT(3) 88 #define POCTRL_VS_POL BIT(2) 89 #define POCTRL_HS_POL BIT(1) 90 #define POCTRL_DE_POL BIT(0) 91 92 /* Video Path */ 93 #define VPCTRL0 0x0450 94 #define VSDELAY GENMASK(31, 20) 95 #define OPXLFMT_RGB666 (0 << 8) 96 #define OPXLFMT_RGB888 (1 << 8) 97 #define FRMSYNC_DISABLED (0 << 4) /* Video Timing Gen Disabled */ 98 #define FRMSYNC_ENABLED (1 << 4) /* Video Timing Gen Enabled */ 99 #define MSF_DISABLED (0 << 0) /* Magic Square FRC disabled */ 100 #define MSF_ENABLED (1 << 0) /* Magic Square FRC enabled */ 101 #define HTIM01 0x0454 102 #define HPW GENMASK(8, 0) 103 #define HBPR GENMASK(24, 16) 104 #define HTIM02 0x0458 105 #define HDISPR GENMASK(10, 0) 106 #define HFPR GENMASK(24, 16) 107 #define VTIM01 0x045c 108 #define VSPR GENMASK(7, 0) 109 #define VBPR GENMASK(23, 16) 110 #define VTIM02 0x0460 111 #define VFPR GENMASK(23, 16) 112 #define VDISPR GENMASK(10, 0) 113 #define VFUEN0 0x0464 114 #define VFUEN BIT(0) /* Video Frame Timing Upload */ 115 116 /* System */ 117 #define TC_IDREG 0x0500 118 #define SYSSTAT 0x0508 119 #define SYSCTRL 0x0510 120 #define DP0_AUDSRC_NO_INPUT (0 << 3) 121 #define DP0_AUDSRC_I2S_RX (1 << 3) 122 #define DP0_VIDSRC_NO_INPUT (0 << 0) 123 #define DP0_VIDSRC_DSI_RX (1 << 0) 124 #define DP0_VIDSRC_DPI_RX (2 << 0) 125 #define DP0_VIDSRC_COLOR_BAR (3 << 0) 126 #define SYSRSTENB 0x050c 127 #define ENBI2C (1 << 0) 128 #define ENBLCD0 (1 << 2) 129 #define ENBBM (1 << 3) 130 #define ENBDSIRX (1 << 4) 131 #define ENBREG (1 << 5) 132 #define ENBHDCP (1 << 8) 133 #define GPIOM 0x0540 134 #define GPIOC 0x0544 135 #define GPIOO 0x0548 136 #define GPIOI 0x054c 137 #define INTCTL_G 0x0560 138 #define INTSTS_G 0x0564 139 140 #define INT_SYSERR BIT(16) 141 #define INT_GPIO_H(x) (1 << (x == 0 ? 2 : 10)) 142 #define INT_GPIO_LC(x) (1 << (x == 0 ? 3 : 11)) 143 144 #define INT_GP0_LCNT 0x0584 145 #define INT_GP1_LCNT 0x0588 146 147 /* Control */ 148 #define DP0CTL 0x0600 149 #define VID_MN_GEN BIT(6) /* Auto-generate M/N values */ 150 #define EF_EN BIT(5) /* Enable Enhanced Framing */ 151 #define VID_EN BIT(1) /* Video transmission enable */ 152 #define DP_EN BIT(0) /* Enable DPTX function */ 153 154 /* Clocks */ 155 #define DP0_VIDMNGEN0 0x0610 156 #define DP0_VIDMNGEN1 0x0614 157 #define DP0_VMNGENSTATUS 0x0618 158 159 /* Main Channel */ 160 #define DP0_SECSAMPLE 0x0640 161 #define DP0_VIDSYNCDELAY 0x0644 162 #define VID_SYNC_DLY GENMASK(15, 0) 163 #define THRESH_DLY GENMASK(31, 16) 164 165 #define DP0_TOTALVAL 0x0648 166 #define H_TOTAL GENMASK(15, 0) 167 #define V_TOTAL GENMASK(31, 16) 168 #define DP0_STARTVAL 0x064c 169 #define H_START GENMASK(15, 0) 170 #define V_START GENMASK(31, 16) 171 #define DP0_ACTIVEVAL 0x0650 172 #define H_ACT GENMASK(15, 0) 173 #define V_ACT GENMASK(31, 16) 174 175 #define DP0_SYNCVAL 0x0654 176 #define VS_WIDTH GENMASK(30, 16) 177 #define HS_WIDTH GENMASK(14, 0) 178 #define SYNCVAL_HS_POL_ACTIVE_LOW (1 << 15) 179 #define SYNCVAL_VS_POL_ACTIVE_LOW (1 << 31) 180 #define DP0_MISC 0x0658 181 #define TU_SIZE_RECOMMENDED (63) /* LSCLK cycles per TU */ 182 #define MAX_TU_SYMBOL GENMASK(28, 23) 183 #define TU_SIZE GENMASK(21, 16) 184 #define BPC_6 (0 << 5) 185 #define BPC_8 (1 << 5) 186 187 /* AUX channel */ 188 #define DP0_AUXCFG0 0x0660 189 #define DP0_AUXCFG0_BSIZE GENMASK(11, 8) 190 #define DP0_AUXCFG0_ADDR_ONLY BIT(4) 191 #define DP0_AUXCFG1 0x0664 192 #define AUX_RX_FILTER_EN BIT(16) 193 194 #define DP0_AUXADDR 0x0668 195 #define DP0_AUXWDATA(i) (0x066c + (i) * 4) 196 #define DP0_AUXRDATA(i) (0x067c + (i) * 4) 197 #define DP0_AUXSTATUS 0x068c 198 #define AUX_BYTES GENMASK(15, 8) 199 #define AUX_STATUS GENMASK(7, 4) 200 #define AUX_TIMEOUT BIT(1) 201 #define AUX_BUSY BIT(0) 202 #define DP0_AUXI2CADR 0x0698 203 204 /* Link Training */ 205 #define DP0_SRCCTRL 0x06a0 206 #define DP0_SRCCTRL_SCRMBLDIS BIT(13) 207 #define DP0_SRCCTRL_EN810B BIT(12) 208 #define DP0_SRCCTRL_NOTP (0 << 8) 209 #define DP0_SRCCTRL_TP1 (1 << 8) 210 #define DP0_SRCCTRL_TP2 (2 << 8) 211 #define DP0_SRCCTRL_LANESKEW BIT(7) 212 #define DP0_SRCCTRL_SSCG BIT(3) 213 #define DP0_SRCCTRL_LANES_1 (0 << 2) 214 #define DP0_SRCCTRL_LANES_2 (1 << 2) 215 #define DP0_SRCCTRL_BW27 (1 << 1) 216 #define DP0_SRCCTRL_BW162 (0 << 1) 217 #define DP0_SRCCTRL_AUTOCORRECT BIT(0) 218 #define DP0_LTSTAT 0x06d0 219 #define LT_LOOPDONE BIT(13) 220 #define LT_STATUS_MASK (0x1f << 8) 221 #define LT_CHANNEL1_EQ_BITS (DP_CHANNEL_EQ_BITS << 4) 222 #define LT_INTERLANE_ALIGN_DONE BIT(3) 223 #define LT_CHANNEL0_EQ_BITS (DP_CHANNEL_EQ_BITS) 224 #define DP0_SNKLTCHGREQ 0x06d4 225 #define DP0_LTLOOPCTRL 0x06d8 226 #define DP0_SNKLTCTRL 0x06e4 227 228 #define DP1_SRCCTRL 0x07a0 229 230 /* PHY */ 231 #define DP_PHY_CTRL 0x0800 232 #define DP_PHY_RST BIT(28) /* DP PHY Global Soft Reset */ 233 #define BGREN BIT(25) /* AUX PHY BGR Enable */ 234 #define PWR_SW_EN BIT(24) /* PHY Power Switch Enable */ 235 #define PHY_M1_RST BIT(12) /* Reset PHY1 Main Channel */ 236 #define PHY_RDY BIT(16) /* PHY Main Channels Ready */ 237 #define PHY_M0_RST BIT(8) /* Reset PHY0 Main Channel */ 238 #define PHY_2LANE BIT(2) /* PHY Enable 2 lanes */ 239 #define PHY_A0_EN BIT(1) /* PHY Aux Channel0 Enable */ 240 #define PHY_M0_EN BIT(0) /* PHY Main Channel0 Enable */ 241 242 /* PLL */ 243 #define DP0_PLLCTRL 0x0900 244 #define DP1_PLLCTRL 0x0904 /* not defined in DS */ 245 #define PXL_PLLCTRL 0x0908 246 #define PLLUPDATE BIT(2) 247 #define PLLBYP BIT(1) 248 #define PLLEN BIT(0) 249 #define PXL_PLLPARAM 0x0914 250 #define IN_SEL_REFCLK (0 << 14) 251 #define SYS_PLLPARAM 0x0918 252 #define REF_FREQ_38M4 (0 << 8) /* 38.4 MHz */ 253 #define REF_FREQ_19M2 (1 << 8) /* 19.2 MHz */ 254 #define REF_FREQ_26M (2 << 8) /* 26 MHz */ 255 #define REF_FREQ_13M (3 << 8) /* 13 MHz */ 256 #define SYSCLK_SEL_LSCLK (0 << 4) 257 #define LSCLK_DIV_1 (0 << 0) 258 #define LSCLK_DIV_2 (1 << 0) 259 260 /* Test & Debug */ 261 #define TSTCTL 0x0a00 262 #define COLOR_R GENMASK(31, 24) 263 #define COLOR_G GENMASK(23, 16) 264 #define COLOR_B GENMASK(15, 8) 265 #define ENI2CFILTER BIT(4) 266 #define COLOR_BAR_MODE GENMASK(1, 0) 267 #define COLOR_BAR_MODE_BARS 2 268 #define PLL_DBG 0x0a04 269 270 static bool tc_test_pattern; 271 module_param_named(test, tc_test_pattern, bool, 0644); 272 273 struct tc_edp_link { 274 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 275 unsigned int rate; 276 u8 num_lanes; 277 u8 assr; 278 bool scrambler_dis; 279 bool spread; 280 }; 281 282 struct tc_data { 283 struct device *dev; 284 struct regmap *regmap; 285 struct drm_dp_aux aux; 286 287 struct drm_bridge bridge; 288 struct drm_bridge *panel_bridge; 289 struct drm_connector connector; 290 291 struct mipi_dsi_device *dsi; 292 293 /* link settings */ 294 struct tc_edp_link link; 295 296 /* current mode */ 297 struct drm_display_mode mode; 298 299 u32 rev; 300 u8 assr; 301 302 struct gpio_desc *sd_gpio; 303 struct gpio_desc *reset_gpio; 304 struct clk *refclk; 305 306 /* do we have IRQ */ 307 bool have_irq; 308 309 /* Input connector type, DSI and not DPI. */ 310 bool input_connector_dsi; 311 312 /* HPD pin number (0 or 1) or -ENODEV */ 313 int hpd_pin; 314 }; 315 316 static inline struct tc_data *aux_to_tc(struct drm_dp_aux *a) 317 { 318 return container_of(a, struct tc_data, aux); 319 } 320 321 static inline struct tc_data *bridge_to_tc(struct drm_bridge *b) 322 { 323 return container_of(b, struct tc_data, bridge); 324 } 325 326 static inline struct tc_data *connector_to_tc(struct drm_connector *c) 327 { 328 return container_of(c, struct tc_data, connector); 329 } 330 331 static inline int tc_poll_timeout(struct tc_data *tc, unsigned int addr, 332 unsigned int cond_mask, 333 unsigned int cond_value, 334 unsigned long sleep_us, u64 timeout_us) 335 { 336 unsigned int val; 337 338 return regmap_read_poll_timeout(tc->regmap, addr, val, 339 (val & cond_mask) == cond_value, 340 sleep_us, timeout_us); 341 } 342 343 static int tc_aux_wait_busy(struct tc_data *tc) 344 { 345 return tc_poll_timeout(tc, DP0_AUXSTATUS, AUX_BUSY, 0, 100, 100000); 346 } 347 348 static int tc_aux_write_data(struct tc_data *tc, const void *data, 349 size_t size) 350 { 351 u32 auxwdata[DP_AUX_MAX_PAYLOAD_BYTES / sizeof(u32)] = { 0 }; 352 int ret, count = ALIGN(size, sizeof(u32)); 353 354 memcpy(auxwdata, data, size); 355 356 ret = regmap_raw_write(tc->regmap, DP0_AUXWDATA(0), auxwdata, count); 357 if (ret) 358 return ret; 359 360 return size; 361 } 362 363 static int tc_aux_read_data(struct tc_data *tc, void *data, size_t size) 364 { 365 u32 auxrdata[DP_AUX_MAX_PAYLOAD_BYTES / sizeof(u32)]; 366 int ret, count = ALIGN(size, sizeof(u32)); 367 368 ret = regmap_raw_read(tc->regmap, DP0_AUXRDATA(0), auxrdata, count); 369 if (ret) 370 return ret; 371 372 memcpy(data, auxrdata, size); 373 374 return size; 375 } 376 377 static u32 tc_auxcfg0(struct drm_dp_aux_msg *msg, size_t size) 378 { 379 u32 auxcfg0 = msg->request; 380 381 if (size) 382 auxcfg0 |= FIELD_PREP(DP0_AUXCFG0_BSIZE, size - 1); 383 else 384 auxcfg0 |= DP0_AUXCFG0_ADDR_ONLY; 385 386 return auxcfg0; 387 } 388 389 static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, 390 struct drm_dp_aux_msg *msg) 391 { 392 struct tc_data *tc = aux_to_tc(aux); 393 size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); 394 u8 request = msg->request & ~DP_AUX_I2C_MOT; 395 u32 auxstatus; 396 int ret; 397 398 ret = tc_aux_wait_busy(tc); 399 if (ret) 400 return ret; 401 402 switch (request) { 403 case DP_AUX_NATIVE_READ: 404 case DP_AUX_I2C_READ: 405 break; 406 case DP_AUX_NATIVE_WRITE: 407 case DP_AUX_I2C_WRITE: 408 if (size) { 409 ret = tc_aux_write_data(tc, msg->buffer, size); 410 if (ret < 0) 411 return ret; 412 } 413 break; 414 default: 415 return -EINVAL; 416 } 417 418 /* Store address */ 419 ret = regmap_write(tc->regmap, DP0_AUXADDR, msg->address); 420 if (ret) 421 return ret; 422 /* Start transfer */ 423 ret = regmap_write(tc->regmap, DP0_AUXCFG0, tc_auxcfg0(msg, size)); 424 if (ret) 425 return ret; 426 427 ret = tc_aux_wait_busy(tc); 428 if (ret) 429 return ret; 430 431 ret = regmap_read(tc->regmap, DP0_AUXSTATUS, &auxstatus); 432 if (ret) 433 return ret; 434 435 if (auxstatus & AUX_TIMEOUT) 436 return -ETIMEDOUT; 437 /* 438 * For some reason address-only DP_AUX_I2C_WRITE (MOT), still 439 * reports 1 byte transferred in its status. To deal we that 440 * we ignore aux_bytes field if we know that this was an 441 * address-only transfer 442 */ 443 if (size) 444 size = FIELD_GET(AUX_BYTES, auxstatus); 445 msg->reply = FIELD_GET(AUX_STATUS, auxstatus); 446 447 switch (request) { 448 case DP_AUX_NATIVE_READ: 449 case DP_AUX_I2C_READ: 450 if (size) 451 return tc_aux_read_data(tc, msg->buffer, size); 452 break; 453 } 454 455 return size; 456 } 457 458 static const char * const training_pattern1_errors[] = { 459 "No errors", 460 "Aux write error", 461 "Aux read error", 462 "Max voltage reached error", 463 "Loop counter expired error", 464 "res", "res", "res" 465 }; 466 467 static const char * const training_pattern2_errors[] = { 468 "No errors", 469 "Aux write error", 470 "Aux read error", 471 "Clock recovery failed error", 472 "Loop counter expired error", 473 "res", "res", "res" 474 }; 475 476 static u32 tc_srcctrl(struct tc_data *tc) 477 { 478 /* 479 * No training pattern, skew lane 1 data by two LSCLK cycles with 480 * respect to lane 0 data, AutoCorrect Mode = 0 481 */ 482 u32 reg = DP0_SRCCTRL_NOTP | DP0_SRCCTRL_LANESKEW | DP0_SRCCTRL_EN810B; 483 484 if (tc->link.scrambler_dis) 485 reg |= DP0_SRCCTRL_SCRMBLDIS; /* Scrambler Disabled */ 486 if (tc->link.spread) 487 reg |= DP0_SRCCTRL_SSCG; /* Spread Spectrum Enable */ 488 if (tc->link.num_lanes == 2) 489 reg |= DP0_SRCCTRL_LANES_2; /* Two Main Channel Lanes */ 490 if (tc->link.rate != 162000) 491 reg |= DP0_SRCCTRL_BW27; /* 2.7 Gbps link */ 492 return reg; 493 } 494 495 static int tc_pllupdate(struct tc_data *tc, unsigned int pllctrl) 496 { 497 int ret; 498 499 ret = regmap_write(tc->regmap, pllctrl, PLLUPDATE | PLLEN); 500 if (ret) 501 return ret; 502 503 /* Wait for PLL to lock: up to 2.09 ms, depending on refclk */ 504 usleep_range(3000, 6000); 505 506 return 0; 507 } 508 509 static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock) 510 { 511 int ret; 512 int i_pre, best_pre = 1; 513 int i_post, best_post = 1; 514 int div, best_div = 1; 515 int mul, best_mul = 1; 516 int delta, best_delta; 517 int ext_div[] = {1, 2, 3, 5, 7}; 518 int clk_min, clk_max; 519 int best_pixelclock = 0; 520 int vco_hi = 0; 521 u32 pxl_pllparam; 522 523 /* 524 * refclk * mul / (ext_pre_div * pre_div) should be in range: 525 * - DPI ..... 0 to 100 MHz 526 * - (e)DP ... 150 to 650 MHz 527 */ 528 if (tc->bridge.type == DRM_MODE_CONNECTOR_DPI) { 529 clk_min = 0; 530 clk_max = 100000000; 531 } else { 532 clk_min = 150000000; 533 clk_max = 650000000; 534 } 535 536 dev_dbg(tc->dev, "PLL: requested %d pixelclock, ref %d\n", pixelclock, 537 refclk); 538 best_delta = pixelclock; 539 /* Loop over all possible ext_divs, skipping invalid configurations */ 540 for (i_pre = 0; i_pre < ARRAY_SIZE(ext_div); i_pre++) { 541 /* 542 * refclk / ext_pre_div should be in the 1 to 200 MHz range. 543 * We don't allow any refclk > 200 MHz, only check lower bounds. 544 */ 545 if (refclk / ext_div[i_pre] < 1000000) 546 continue; 547 for (i_post = 0; i_post < ARRAY_SIZE(ext_div); i_post++) { 548 for (div = 1; div <= 16; div++) { 549 u32 clk; 550 u64 tmp; 551 552 tmp = pixelclock * ext_div[i_pre] * 553 ext_div[i_post] * div; 554 do_div(tmp, refclk); 555 mul = tmp; 556 557 /* Check limits */ 558 if ((mul < 1) || (mul > 128)) 559 continue; 560 561 clk = (refclk / ext_div[i_pre] / div) * mul; 562 if ((clk > clk_max) || (clk < clk_min)) 563 continue; 564 565 clk = clk / ext_div[i_post]; 566 delta = clk - pixelclock; 567 568 if (abs(delta) < abs(best_delta)) { 569 best_pre = i_pre; 570 best_post = i_post; 571 best_div = div; 572 best_mul = mul; 573 best_delta = delta; 574 best_pixelclock = clk; 575 } 576 } 577 } 578 } 579 if (best_pixelclock == 0) { 580 dev_err(tc->dev, "Failed to calc clock for %d pixelclock\n", 581 pixelclock); 582 return -EINVAL; 583 } 584 585 dev_dbg(tc->dev, "PLL: got %d, delta %d\n", best_pixelclock, 586 best_delta); 587 dev_dbg(tc->dev, "PLL: %d / %d / %d * %d / %d\n", refclk, 588 ext_div[best_pre], best_div, best_mul, ext_div[best_post]); 589 590 /* if VCO >= 300 MHz */ 591 if (refclk / ext_div[best_pre] / best_div * best_mul >= 300000000) 592 vco_hi = 1; 593 /* see DS */ 594 if (best_div == 16) 595 best_div = 0; 596 if (best_mul == 128) 597 best_mul = 0; 598 599 /* Power up PLL and switch to bypass */ 600 ret = regmap_write(tc->regmap, PXL_PLLCTRL, PLLBYP | PLLEN); 601 if (ret) 602 return ret; 603 604 pxl_pllparam = vco_hi << 24; /* For PLL VCO >= 300 MHz = 1 */ 605 pxl_pllparam |= ext_div[best_pre] << 20; /* External Pre-divider */ 606 pxl_pllparam |= ext_div[best_post] << 16; /* External Post-divider */ 607 pxl_pllparam |= IN_SEL_REFCLK; /* Use RefClk as PLL input */ 608 pxl_pllparam |= best_div << 8; /* Divider for PLL RefClk */ 609 pxl_pllparam |= best_mul; /* Multiplier for PLL */ 610 611 ret = regmap_write(tc->regmap, PXL_PLLPARAM, pxl_pllparam); 612 if (ret) 613 return ret; 614 615 /* Force PLL parameter update and disable bypass */ 616 return tc_pllupdate(tc, PXL_PLLCTRL); 617 } 618 619 static int tc_pxl_pll_dis(struct tc_data *tc) 620 { 621 /* Enable PLL bypass, power down PLL */ 622 return regmap_write(tc->regmap, PXL_PLLCTRL, PLLBYP); 623 } 624 625 static int tc_stream_clock_calc(struct tc_data *tc) 626 { 627 /* 628 * If the Stream clock and Link Symbol clock are 629 * asynchronous with each other, the value of M changes over 630 * time. This way of generating link clock and stream 631 * clock is called Asynchronous Clock mode. The value M 632 * must change while the value N stays constant. The 633 * value of N in this Asynchronous Clock mode must be set 634 * to 2^15 or 32,768. 635 * 636 * LSCLK = 1/10 of high speed link clock 637 * 638 * f_STRMCLK = M/N * f_LSCLK 639 * M/N = f_STRMCLK / f_LSCLK 640 * 641 */ 642 return regmap_write(tc->regmap, DP0_VIDMNGEN1, 32768); 643 } 644 645 static int tc_set_syspllparam(struct tc_data *tc) 646 { 647 unsigned long rate; 648 u32 pllparam = SYSCLK_SEL_LSCLK | LSCLK_DIV_2; 649 650 rate = clk_get_rate(tc->refclk); 651 switch (rate) { 652 case 38400000: 653 pllparam |= REF_FREQ_38M4; 654 break; 655 case 26000000: 656 pllparam |= REF_FREQ_26M; 657 break; 658 case 19200000: 659 pllparam |= REF_FREQ_19M2; 660 break; 661 case 13000000: 662 pllparam |= REF_FREQ_13M; 663 break; 664 default: 665 dev_err(tc->dev, "Invalid refclk rate: %lu Hz\n", rate); 666 return -EINVAL; 667 } 668 669 return regmap_write(tc->regmap, SYS_PLLPARAM, pllparam); 670 } 671 672 static int tc_aux_link_setup(struct tc_data *tc) 673 { 674 int ret; 675 u32 dp0_auxcfg1; 676 677 /* Setup DP-PHY / PLL */ 678 ret = tc_set_syspllparam(tc); 679 if (ret) 680 goto err; 681 682 ret = regmap_write(tc->regmap, DP_PHY_CTRL, 683 BGREN | PWR_SW_EN | PHY_A0_EN); 684 if (ret) 685 goto err; 686 /* 687 * Initially PLLs are in bypass. Force PLL parameter update, 688 * disable PLL bypass, enable PLL 689 */ 690 ret = tc_pllupdate(tc, DP0_PLLCTRL); 691 if (ret) 692 goto err; 693 694 ret = tc_pllupdate(tc, DP1_PLLCTRL); 695 if (ret) 696 goto err; 697 698 ret = tc_poll_timeout(tc, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 100, 100000); 699 if (ret == -ETIMEDOUT) { 700 dev_err(tc->dev, "Timeout waiting for PHY to become ready"); 701 return ret; 702 } else if (ret) { 703 goto err; 704 } 705 706 /* Setup AUX link */ 707 dp0_auxcfg1 = AUX_RX_FILTER_EN; 708 dp0_auxcfg1 |= 0x06 << 8; /* Aux Bit Period Calculator Threshold */ 709 dp0_auxcfg1 |= 0x3f << 0; /* Aux Response Timeout Timer */ 710 711 ret = regmap_write(tc->regmap, DP0_AUXCFG1, dp0_auxcfg1); 712 if (ret) 713 goto err; 714 715 /* Register DP AUX channel */ 716 tc->aux.name = "TC358767 AUX i2c adapter"; 717 tc->aux.dev = tc->dev; 718 tc->aux.transfer = tc_aux_transfer; 719 drm_dp_aux_init(&tc->aux); 720 721 return 0; 722 err: 723 dev_err(tc->dev, "tc_aux_link_setup failed: %d\n", ret); 724 return ret; 725 } 726 727 static int tc_get_display_props(struct tc_data *tc) 728 { 729 u8 revision, num_lanes; 730 unsigned int rate; 731 int ret; 732 u8 reg; 733 734 /* Read DP Rx Link Capability */ 735 ret = drm_dp_dpcd_read(&tc->aux, DP_DPCD_REV, tc->link.dpcd, 736 DP_RECEIVER_CAP_SIZE); 737 if (ret < 0) 738 goto err_dpcd_read; 739 740 revision = tc->link.dpcd[DP_DPCD_REV]; 741 rate = drm_dp_max_link_rate(tc->link.dpcd); 742 num_lanes = drm_dp_max_lane_count(tc->link.dpcd); 743 744 if (rate != 162000 && rate != 270000) { 745 dev_dbg(tc->dev, "Falling to 2.7 Gbps rate\n"); 746 rate = 270000; 747 } 748 749 tc->link.rate = rate; 750 751 if (num_lanes > 2) { 752 dev_dbg(tc->dev, "Falling to 2 lanes\n"); 753 num_lanes = 2; 754 } 755 756 tc->link.num_lanes = num_lanes; 757 758 ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, ®); 759 if (ret < 0) 760 goto err_dpcd_read; 761 tc->link.spread = reg & DP_MAX_DOWNSPREAD_0_5; 762 763 ret = drm_dp_dpcd_readb(&tc->aux, DP_MAIN_LINK_CHANNEL_CODING, ®); 764 if (ret < 0) 765 goto err_dpcd_read; 766 767 tc->link.scrambler_dis = false; 768 /* read assr */ 769 ret = drm_dp_dpcd_readb(&tc->aux, DP_EDP_CONFIGURATION_SET, ®); 770 if (ret < 0) 771 goto err_dpcd_read; 772 tc->link.assr = reg & DP_ALTERNATE_SCRAMBLER_RESET_ENABLE; 773 774 dev_dbg(tc->dev, "DPCD rev: %d.%d, rate: %s, lanes: %d, framing: %s\n", 775 revision >> 4, revision & 0x0f, 776 (tc->link.rate == 162000) ? "1.62Gbps" : "2.7Gbps", 777 tc->link.num_lanes, 778 drm_dp_enhanced_frame_cap(tc->link.dpcd) ? 779 "enhanced" : "default"); 780 dev_dbg(tc->dev, "Downspread: %s, scrambler: %s\n", 781 tc->link.spread ? "0.5%" : "0.0%", 782 tc->link.scrambler_dis ? "disabled" : "enabled"); 783 dev_dbg(tc->dev, "Display ASSR: %d, TC358767 ASSR: %d\n", 784 tc->link.assr, tc->assr); 785 786 return 0; 787 788 err_dpcd_read: 789 dev_err(tc->dev, "failed to read DPCD: %d\n", ret); 790 return ret; 791 } 792 793 static int tc_set_common_video_mode(struct tc_data *tc, 794 const struct drm_display_mode *mode) 795 { 796 int left_margin = mode->htotal - mode->hsync_end; 797 int right_margin = mode->hsync_start - mode->hdisplay; 798 int hsync_len = mode->hsync_end - mode->hsync_start; 799 int upper_margin = mode->vtotal - mode->vsync_end; 800 int lower_margin = mode->vsync_start - mode->vdisplay; 801 int vsync_len = mode->vsync_end - mode->vsync_start; 802 int ret; 803 804 dev_dbg(tc->dev, "set mode %dx%d\n", 805 mode->hdisplay, mode->vdisplay); 806 dev_dbg(tc->dev, "H margin %d,%d sync %d\n", 807 left_margin, right_margin, hsync_len); 808 dev_dbg(tc->dev, "V margin %d,%d sync %d\n", 809 upper_margin, lower_margin, vsync_len); 810 dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal); 811 812 813 /* 814 * LCD Ctl Frame Size 815 * datasheet is not clear of vsdelay in case of DPI 816 * assume we do not need any delay when DPI is a source of 817 * sync signals 818 */ 819 ret = regmap_write(tc->regmap, VPCTRL0, 820 FIELD_PREP(VSDELAY, 0) | 821 OPXLFMT_RGB888 | FRMSYNC_DISABLED | MSF_DISABLED); 822 if (ret) 823 return ret; 824 825 ret = regmap_write(tc->regmap, HTIM01, 826 FIELD_PREP(HBPR, ALIGN(left_margin, 2)) | 827 FIELD_PREP(HPW, ALIGN(hsync_len, 2))); 828 if (ret) 829 return ret; 830 831 ret = regmap_write(tc->regmap, HTIM02, 832 FIELD_PREP(HDISPR, ALIGN(mode->hdisplay, 2)) | 833 FIELD_PREP(HFPR, ALIGN(right_margin, 2))); 834 if (ret) 835 return ret; 836 837 ret = regmap_write(tc->regmap, VTIM01, 838 FIELD_PREP(VBPR, upper_margin) | 839 FIELD_PREP(VSPR, vsync_len)); 840 if (ret) 841 return ret; 842 843 ret = regmap_write(tc->regmap, VTIM02, 844 FIELD_PREP(VFPR, lower_margin) | 845 FIELD_PREP(VDISPR, mode->vdisplay)); 846 if (ret) 847 return ret; 848 849 ret = regmap_write(tc->regmap, VFUEN0, VFUEN); /* update settings */ 850 if (ret) 851 return ret; 852 853 /* Test pattern settings */ 854 ret = regmap_write(tc->regmap, TSTCTL, 855 FIELD_PREP(COLOR_R, 120) | 856 FIELD_PREP(COLOR_G, 20) | 857 FIELD_PREP(COLOR_B, 99) | 858 ENI2CFILTER | 859 FIELD_PREP(COLOR_BAR_MODE, COLOR_BAR_MODE_BARS)); 860 861 return ret; 862 } 863 864 static int tc_set_dpi_video_mode(struct tc_data *tc, 865 const struct drm_display_mode *mode) 866 { 867 u32 value = POCTRL_S2P; 868 869 if (tc->mode.flags & DRM_MODE_FLAG_NHSYNC) 870 value |= POCTRL_HS_POL; 871 872 if (tc->mode.flags & DRM_MODE_FLAG_NVSYNC) 873 value |= POCTRL_VS_POL; 874 875 return regmap_write(tc->regmap, POCTRL, value); 876 } 877 878 static int tc_set_edp_video_mode(struct tc_data *tc, 879 const struct drm_display_mode *mode) 880 { 881 int ret; 882 int vid_sync_dly; 883 int max_tu_symbol; 884 885 int left_margin = mode->htotal - mode->hsync_end; 886 int hsync_len = mode->hsync_end - mode->hsync_start; 887 int upper_margin = mode->vtotal - mode->vsync_end; 888 int vsync_len = mode->vsync_end - mode->vsync_start; 889 u32 dp0_syncval; 890 u32 bits_per_pixel = 24; 891 u32 in_bw, out_bw; 892 u32 dpipxlfmt; 893 894 /* 895 * Recommended maximum number of symbols transferred in a transfer unit: 896 * DIV_ROUND_UP((input active video bandwidth in bytes) * tu_size, 897 * (output active video bandwidth in bytes)) 898 * Must be less than tu_size. 899 */ 900 901 in_bw = mode->clock * bits_per_pixel / 8; 902 out_bw = tc->link.num_lanes * tc->link.rate; 903 max_tu_symbol = DIV_ROUND_UP(in_bw * TU_SIZE_RECOMMENDED, out_bw); 904 905 /* DP Main Stream Attributes */ 906 vid_sync_dly = hsync_len + left_margin + mode->hdisplay; 907 ret = regmap_write(tc->regmap, DP0_VIDSYNCDELAY, 908 FIELD_PREP(THRESH_DLY, max_tu_symbol) | 909 FIELD_PREP(VID_SYNC_DLY, vid_sync_dly)); 910 911 ret = regmap_write(tc->regmap, DP0_TOTALVAL, 912 FIELD_PREP(H_TOTAL, mode->htotal) | 913 FIELD_PREP(V_TOTAL, mode->vtotal)); 914 if (ret) 915 return ret; 916 917 ret = regmap_write(tc->regmap, DP0_STARTVAL, 918 FIELD_PREP(H_START, left_margin + hsync_len) | 919 FIELD_PREP(V_START, upper_margin + vsync_len)); 920 if (ret) 921 return ret; 922 923 ret = regmap_write(tc->regmap, DP0_ACTIVEVAL, 924 FIELD_PREP(V_ACT, mode->vdisplay) | 925 FIELD_PREP(H_ACT, mode->hdisplay)); 926 if (ret) 927 return ret; 928 929 dp0_syncval = FIELD_PREP(VS_WIDTH, vsync_len) | 930 FIELD_PREP(HS_WIDTH, hsync_len); 931 932 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 933 dp0_syncval |= SYNCVAL_VS_POL_ACTIVE_LOW; 934 935 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 936 dp0_syncval |= SYNCVAL_HS_POL_ACTIVE_LOW; 937 938 ret = regmap_write(tc->regmap, DP0_SYNCVAL, dp0_syncval); 939 if (ret) 940 return ret; 941 942 dpipxlfmt = DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888; 943 944 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 945 dpipxlfmt |= VS_POL_ACTIVE_LOW; 946 947 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 948 dpipxlfmt |= HS_POL_ACTIVE_LOW; 949 950 ret = regmap_write(tc->regmap, DPIPXLFMT, dpipxlfmt); 951 if (ret) 952 return ret; 953 954 ret = regmap_write(tc->regmap, DP0_MISC, 955 FIELD_PREP(MAX_TU_SYMBOL, max_tu_symbol) | 956 FIELD_PREP(TU_SIZE, TU_SIZE_RECOMMENDED) | 957 BPC_8); 958 return ret; 959 } 960 961 static int tc_wait_link_training(struct tc_data *tc) 962 { 963 u32 value; 964 int ret; 965 966 ret = tc_poll_timeout(tc, DP0_LTSTAT, LT_LOOPDONE, 967 LT_LOOPDONE, 500, 100000); 968 if (ret) { 969 dev_err(tc->dev, "Link training timeout waiting for LT_LOOPDONE!\n"); 970 return ret; 971 } 972 973 ret = regmap_read(tc->regmap, DP0_LTSTAT, &value); 974 if (ret) 975 return ret; 976 977 return (value >> 8) & 0x7; 978 } 979 980 static int tc_main_link_enable(struct tc_data *tc) 981 { 982 struct drm_dp_aux *aux = &tc->aux; 983 struct device *dev = tc->dev; 984 u32 dp_phy_ctrl; 985 u32 value; 986 int ret; 987 u8 tmp[DP_LINK_STATUS_SIZE]; 988 989 dev_dbg(tc->dev, "link enable\n"); 990 991 ret = regmap_read(tc->regmap, DP0CTL, &value); 992 if (ret) 993 return ret; 994 995 if (WARN_ON(value & DP_EN)) { 996 ret = regmap_write(tc->regmap, DP0CTL, 0); 997 if (ret) 998 return ret; 999 } 1000 1001 ret = regmap_write(tc->regmap, DP0_SRCCTRL, tc_srcctrl(tc)); 1002 if (ret) 1003 return ret; 1004 /* SSCG and BW27 on DP1 must be set to the same as on DP0 */ 1005 ret = regmap_write(tc->regmap, DP1_SRCCTRL, 1006 (tc->link.spread ? DP0_SRCCTRL_SSCG : 0) | 1007 ((tc->link.rate != 162000) ? DP0_SRCCTRL_BW27 : 0)); 1008 if (ret) 1009 return ret; 1010 1011 ret = tc_set_syspllparam(tc); 1012 if (ret) 1013 return ret; 1014 1015 /* Setup Main Link */ 1016 dp_phy_ctrl = BGREN | PWR_SW_EN | PHY_A0_EN | PHY_M0_EN; 1017 if (tc->link.num_lanes == 2) 1018 dp_phy_ctrl |= PHY_2LANE; 1019 1020 ret = regmap_write(tc->regmap, DP_PHY_CTRL, dp_phy_ctrl); 1021 if (ret) 1022 return ret; 1023 1024 /* PLL setup */ 1025 ret = tc_pllupdate(tc, DP0_PLLCTRL); 1026 if (ret) 1027 return ret; 1028 1029 ret = tc_pllupdate(tc, DP1_PLLCTRL); 1030 if (ret) 1031 return ret; 1032 1033 /* Reset/Enable Main Links */ 1034 dp_phy_ctrl |= DP_PHY_RST | PHY_M1_RST | PHY_M0_RST; 1035 ret = regmap_write(tc->regmap, DP_PHY_CTRL, dp_phy_ctrl); 1036 usleep_range(100, 200); 1037 dp_phy_ctrl &= ~(DP_PHY_RST | PHY_M1_RST | PHY_M0_RST); 1038 ret = regmap_write(tc->regmap, DP_PHY_CTRL, dp_phy_ctrl); 1039 1040 ret = tc_poll_timeout(tc, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 500, 100000); 1041 if (ret) { 1042 dev_err(dev, "timeout waiting for phy become ready"); 1043 return ret; 1044 } 1045 1046 /* Set misc: 8 bits per color */ 1047 ret = regmap_update_bits(tc->regmap, DP0_MISC, BPC_8, BPC_8); 1048 if (ret) 1049 return ret; 1050 1051 /* 1052 * ASSR mode 1053 * on TC358767 side ASSR configured through strap pin 1054 * seems there is no way to change this setting from SW 1055 * 1056 * check is tc configured for same mode 1057 */ 1058 if (tc->assr != tc->link.assr) { 1059 dev_dbg(dev, "Trying to set display to ASSR: %d\n", 1060 tc->assr); 1061 /* try to set ASSR on display side */ 1062 tmp[0] = tc->assr; 1063 ret = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET, tmp[0]); 1064 if (ret < 0) 1065 goto err_dpcd_read; 1066 /* read back */ 1067 ret = drm_dp_dpcd_readb(aux, DP_EDP_CONFIGURATION_SET, tmp); 1068 if (ret < 0) 1069 goto err_dpcd_read; 1070 1071 if (tmp[0] != tc->assr) { 1072 dev_dbg(dev, "Failed to switch display ASSR to %d, falling back to unscrambled mode\n", 1073 tc->assr); 1074 /* trying with disabled scrambler */ 1075 tc->link.scrambler_dis = true; 1076 } 1077 } 1078 1079 /* Setup Link & DPRx Config for Training */ 1080 tmp[0] = drm_dp_link_rate_to_bw_code(tc->link.rate); 1081 tmp[1] = tc->link.num_lanes; 1082 1083 if (drm_dp_enhanced_frame_cap(tc->link.dpcd)) 1084 tmp[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 1085 1086 ret = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, tmp, 2); 1087 if (ret < 0) 1088 goto err_dpcd_write; 1089 1090 /* DOWNSPREAD_CTRL */ 1091 tmp[0] = tc->link.spread ? DP_SPREAD_AMP_0_5 : 0x00; 1092 /* MAIN_LINK_CHANNEL_CODING_SET */ 1093 tmp[1] = DP_SET_ANSI_8B10B; 1094 ret = drm_dp_dpcd_write(aux, DP_DOWNSPREAD_CTRL, tmp, 2); 1095 if (ret < 0) 1096 goto err_dpcd_write; 1097 1098 /* Reset voltage-swing & pre-emphasis */ 1099 tmp[0] = tmp[1] = DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | 1100 DP_TRAIN_PRE_EMPH_LEVEL_0; 1101 ret = drm_dp_dpcd_write(aux, DP_TRAINING_LANE0_SET, tmp, 2); 1102 if (ret < 0) 1103 goto err_dpcd_write; 1104 1105 /* Clock-Recovery */ 1106 1107 /* Set DPCD 0x102 for Training Pattern 1 */ 1108 ret = regmap_write(tc->regmap, DP0_SNKLTCTRL, 1109 DP_LINK_SCRAMBLING_DISABLE | 1110 DP_TRAINING_PATTERN_1); 1111 if (ret) 1112 return ret; 1113 1114 ret = regmap_write(tc->regmap, DP0_LTLOOPCTRL, 1115 (15 << 28) | /* Defer Iteration Count */ 1116 (15 << 24) | /* Loop Iteration Count */ 1117 (0xd << 0)); /* Loop Timer Delay */ 1118 if (ret) 1119 return ret; 1120 1121 ret = regmap_write(tc->regmap, DP0_SRCCTRL, 1122 tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | 1123 DP0_SRCCTRL_AUTOCORRECT | 1124 DP0_SRCCTRL_TP1); 1125 if (ret) 1126 return ret; 1127 1128 /* Enable DP0 to start Link Training */ 1129 ret = regmap_write(tc->regmap, DP0CTL, 1130 (drm_dp_enhanced_frame_cap(tc->link.dpcd) ? 1131 EF_EN : 0) | DP_EN); 1132 if (ret) 1133 return ret; 1134 1135 /* wait */ 1136 1137 ret = tc_wait_link_training(tc); 1138 if (ret < 0) 1139 return ret; 1140 1141 if (ret) { 1142 dev_err(tc->dev, "Link training phase 1 failed: %s\n", 1143 training_pattern1_errors[ret]); 1144 return -ENODEV; 1145 } 1146 1147 /* Channel Equalization */ 1148 1149 /* Set DPCD 0x102 for Training Pattern 2 */ 1150 ret = regmap_write(tc->regmap, DP0_SNKLTCTRL, 1151 DP_LINK_SCRAMBLING_DISABLE | 1152 DP_TRAINING_PATTERN_2); 1153 if (ret) 1154 return ret; 1155 1156 ret = regmap_write(tc->regmap, DP0_SRCCTRL, 1157 tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | 1158 DP0_SRCCTRL_AUTOCORRECT | 1159 DP0_SRCCTRL_TP2); 1160 if (ret) 1161 return ret; 1162 1163 /* wait */ 1164 ret = tc_wait_link_training(tc); 1165 if (ret < 0) 1166 return ret; 1167 1168 if (ret) { 1169 dev_err(tc->dev, "Link training phase 2 failed: %s\n", 1170 training_pattern2_errors[ret]); 1171 return -ENODEV; 1172 } 1173 1174 /* 1175 * Toshiba's documentation suggests to first clear DPCD 0x102, then 1176 * clear the training pattern bit in DP0_SRCCTRL. Testing shows 1177 * that the link sometimes drops if those steps are done in that order, 1178 * but if the steps are done in reverse order, the link stays up. 1179 * 1180 * So we do the steps differently than documented here. 1181 */ 1182 1183 /* Clear Training Pattern, set AutoCorrect Mode = 1 */ 1184 ret = regmap_write(tc->regmap, DP0_SRCCTRL, tc_srcctrl(tc) | 1185 DP0_SRCCTRL_AUTOCORRECT); 1186 if (ret) 1187 return ret; 1188 1189 /* Clear DPCD 0x102 */ 1190 /* Note: Can Not use DP0_SNKLTCTRL (0x06E4) short cut */ 1191 tmp[0] = tc->link.scrambler_dis ? DP_LINK_SCRAMBLING_DISABLE : 0x00; 1192 ret = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET, tmp[0]); 1193 if (ret < 0) 1194 goto err_dpcd_write; 1195 1196 /* Check link status */ 1197 ret = drm_dp_dpcd_read_link_status(aux, tmp); 1198 if (ret < 0) 1199 goto err_dpcd_read; 1200 1201 ret = 0; 1202 1203 value = tmp[0] & DP_CHANNEL_EQ_BITS; 1204 1205 if (value != DP_CHANNEL_EQ_BITS) { 1206 dev_err(tc->dev, "Lane 0 failed: %x\n", value); 1207 ret = -ENODEV; 1208 } 1209 1210 if (tc->link.num_lanes == 2) { 1211 value = (tmp[0] >> 4) & DP_CHANNEL_EQ_BITS; 1212 1213 if (value != DP_CHANNEL_EQ_BITS) { 1214 dev_err(tc->dev, "Lane 1 failed: %x\n", value); 1215 ret = -ENODEV; 1216 } 1217 1218 if (!(tmp[2] & DP_INTERLANE_ALIGN_DONE)) { 1219 dev_err(tc->dev, "Interlane align failed\n"); 1220 ret = -ENODEV; 1221 } 1222 } 1223 1224 if (ret) { 1225 dev_err(dev, "0x0202 LANE0_1_STATUS: 0x%02x\n", tmp[0]); 1226 dev_err(dev, "0x0203 LANE2_3_STATUS 0x%02x\n", tmp[1]); 1227 dev_err(dev, "0x0204 LANE_ALIGN_STATUS_UPDATED: 0x%02x\n", tmp[2]); 1228 dev_err(dev, "0x0205 SINK_STATUS: 0x%02x\n", tmp[3]); 1229 dev_err(dev, "0x0206 ADJUST_REQUEST_LANE0_1: 0x%02x\n", tmp[4]); 1230 dev_err(dev, "0x0207 ADJUST_REQUEST_LANE2_3: 0x%02x\n", tmp[5]); 1231 return ret; 1232 } 1233 1234 return 0; 1235 err_dpcd_read: 1236 dev_err(tc->dev, "Failed to read DPCD: %d\n", ret); 1237 return ret; 1238 err_dpcd_write: 1239 dev_err(tc->dev, "Failed to write DPCD: %d\n", ret); 1240 return ret; 1241 } 1242 1243 static int tc_main_link_disable(struct tc_data *tc) 1244 { 1245 int ret; 1246 1247 dev_dbg(tc->dev, "link disable\n"); 1248 1249 ret = regmap_write(tc->regmap, DP0_SRCCTRL, 0); 1250 if (ret) 1251 return ret; 1252 1253 ret = regmap_write(tc->regmap, DP0CTL, 0); 1254 if (ret) 1255 return ret; 1256 1257 return regmap_update_bits(tc->regmap, DP_PHY_CTRL, 1258 PHY_M0_RST | PHY_M1_RST | PHY_M0_EN, 1259 PHY_M0_RST | PHY_M1_RST); 1260 } 1261 1262 static int tc_dsi_rx_enable(struct tc_data *tc) 1263 { 1264 u32 value; 1265 int ret; 1266 1267 regmap_write(tc->regmap, PPI_D0S_CLRSIPOCOUNT, 25); 1268 regmap_write(tc->regmap, PPI_D1S_CLRSIPOCOUNT, 25); 1269 regmap_write(tc->regmap, PPI_D2S_CLRSIPOCOUNT, 25); 1270 regmap_write(tc->regmap, PPI_D3S_CLRSIPOCOUNT, 25); 1271 regmap_write(tc->regmap, PPI_D0S_ATMR, 0); 1272 regmap_write(tc->regmap, PPI_D1S_ATMR, 0); 1273 regmap_write(tc->regmap, PPI_TX_RX_TA, TTA_GET | TTA_SURE); 1274 regmap_write(tc->regmap, PPI_LPTXTIMECNT, LPX_PERIOD); 1275 1276 value = ((LANEENABLE_L0EN << tc->dsi->lanes) - LANEENABLE_L0EN) | 1277 LANEENABLE_CLEN; 1278 regmap_write(tc->regmap, PPI_LANEENABLE, value); 1279 regmap_write(tc->regmap, DSI_LANEENABLE, value); 1280 1281 /* Set input interface */ 1282 value = DP0_AUDSRC_NO_INPUT; 1283 if (tc_test_pattern) 1284 value |= DP0_VIDSRC_COLOR_BAR; 1285 else 1286 value |= DP0_VIDSRC_DSI_RX; 1287 ret = regmap_write(tc->regmap, SYSCTRL, value); 1288 if (ret) 1289 return ret; 1290 1291 usleep_range(120, 150); 1292 1293 regmap_write(tc->regmap, PPI_STARTPPI, PPI_START_FUNCTION); 1294 regmap_write(tc->regmap, DSI_STARTDSI, DSI_RX_START); 1295 1296 return 0; 1297 } 1298 1299 static int tc_dpi_rx_enable(struct tc_data *tc) 1300 { 1301 u32 value; 1302 1303 /* Set input interface */ 1304 value = DP0_AUDSRC_NO_INPUT; 1305 if (tc_test_pattern) 1306 value |= DP0_VIDSRC_COLOR_BAR; 1307 else 1308 value |= DP0_VIDSRC_DPI_RX; 1309 return regmap_write(tc->regmap, SYSCTRL, value); 1310 } 1311 1312 static int tc_dpi_stream_enable(struct tc_data *tc) 1313 { 1314 int ret; 1315 1316 dev_dbg(tc->dev, "enable video stream\n"); 1317 1318 /* Setup PLL */ 1319 ret = tc_set_syspllparam(tc); 1320 if (ret) 1321 return ret; 1322 1323 /* 1324 * Initially PLLs are in bypass. Force PLL parameter update, 1325 * disable PLL bypass, enable PLL 1326 */ 1327 ret = tc_pllupdate(tc, DP0_PLLCTRL); 1328 if (ret) 1329 return ret; 1330 1331 ret = tc_pllupdate(tc, DP1_PLLCTRL); 1332 if (ret) 1333 return ret; 1334 1335 /* Pixel PLL must always be enabled for DPI mode */ 1336 ret = tc_pxl_pll_en(tc, clk_get_rate(tc->refclk), 1337 1000 * tc->mode.clock); 1338 if (ret) 1339 return ret; 1340 1341 ret = tc_set_common_video_mode(tc, &tc->mode); 1342 if (ret) 1343 return ret; 1344 1345 ret = tc_set_dpi_video_mode(tc, &tc->mode); 1346 if (ret) 1347 return ret; 1348 1349 return tc_dsi_rx_enable(tc); 1350 } 1351 1352 static int tc_dpi_stream_disable(struct tc_data *tc) 1353 { 1354 dev_dbg(tc->dev, "disable video stream\n"); 1355 1356 tc_pxl_pll_dis(tc); 1357 1358 return 0; 1359 } 1360 1361 static int tc_edp_stream_enable(struct tc_data *tc) 1362 { 1363 int ret; 1364 u32 value; 1365 1366 dev_dbg(tc->dev, "enable video stream\n"); 1367 1368 /* 1369 * Pixel PLL must be enabled for DSI input mode and test pattern. 1370 * 1371 * Per TC9595XBG datasheet Revision 0.1 2018-12-27 Figure 4.18 1372 * "Clock Mode Selection and Clock Sources", either Pixel PLL 1373 * or DPI_PCLK supplies StrmClk. DPI_PCLK is only available in 1374 * case valid Pixel Clock are supplied to the chip DPI input. 1375 * In case built-in test pattern is desired OR DSI input mode 1376 * is used, DPI_PCLK is not available and thus Pixel PLL must 1377 * be used instead. 1378 */ 1379 if (tc->input_connector_dsi || tc_test_pattern) { 1380 ret = tc_pxl_pll_en(tc, clk_get_rate(tc->refclk), 1381 1000 * tc->mode.clock); 1382 if (ret) 1383 return ret; 1384 } 1385 1386 ret = tc_set_common_video_mode(tc, &tc->mode); 1387 if (ret) 1388 return ret; 1389 1390 ret = tc_set_edp_video_mode(tc, &tc->mode); 1391 if (ret) 1392 return ret; 1393 1394 /* Set M/N */ 1395 ret = tc_stream_clock_calc(tc); 1396 if (ret) 1397 return ret; 1398 1399 value = VID_MN_GEN | DP_EN; 1400 if (drm_dp_enhanced_frame_cap(tc->link.dpcd)) 1401 value |= EF_EN; 1402 ret = regmap_write(tc->regmap, DP0CTL, value); 1403 if (ret) 1404 return ret; 1405 /* 1406 * VID_EN assertion should be delayed by at least N * LSCLK 1407 * cycles from the time VID_MN_GEN is enabled in order to 1408 * generate stable values for VID_M. LSCLK is 270 MHz or 1409 * 162 MHz, VID_N is set to 32768 in tc_stream_clock_calc(), 1410 * so a delay of at least 203 us should suffice. 1411 */ 1412 usleep_range(500, 1000); 1413 value |= VID_EN; 1414 ret = regmap_write(tc->regmap, DP0CTL, value); 1415 if (ret) 1416 return ret; 1417 1418 /* Set input interface */ 1419 if (tc->input_connector_dsi) 1420 return tc_dsi_rx_enable(tc); 1421 else 1422 return tc_dpi_rx_enable(tc); 1423 } 1424 1425 static int tc_edp_stream_disable(struct tc_data *tc) 1426 { 1427 int ret; 1428 1429 dev_dbg(tc->dev, "disable video stream\n"); 1430 1431 ret = regmap_update_bits(tc->regmap, DP0CTL, VID_EN, 0); 1432 if (ret) 1433 return ret; 1434 1435 tc_pxl_pll_dis(tc); 1436 1437 return 0; 1438 } 1439 1440 static void 1441 tc_dpi_bridge_atomic_enable(struct drm_bridge *bridge, 1442 struct drm_bridge_state *old_bridge_state) 1443 1444 { 1445 struct tc_data *tc = bridge_to_tc(bridge); 1446 int ret; 1447 1448 ret = tc_dpi_stream_enable(tc); 1449 if (ret < 0) { 1450 dev_err(tc->dev, "main link stream start error: %d\n", ret); 1451 tc_main_link_disable(tc); 1452 return; 1453 } 1454 } 1455 1456 static void 1457 tc_dpi_bridge_atomic_disable(struct drm_bridge *bridge, 1458 struct drm_bridge_state *old_bridge_state) 1459 { 1460 struct tc_data *tc = bridge_to_tc(bridge); 1461 int ret; 1462 1463 ret = tc_dpi_stream_disable(tc); 1464 if (ret < 0) 1465 dev_err(tc->dev, "main link stream stop error: %d\n", ret); 1466 } 1467 1468 static void 1469 tc_edp_bridge_atomic_enable(struct drm_bridge *bridge, 1470 struct drm_bridge_state *old_bridge_state) 1471 { 1472 struct tc_data *tc = bridge_to_tc(bridge); 1473 int ret; 1474 1475 ret = tc_get_display_props(tc); 1476 if (ret < 0) { 1477 dev_err(tc->dev, "failed to read display props: %d\n", ret); 1478 return; 1479 } 1480 1481 ret = tc_main_link_enable(tc); 1482 if (ret < 0) { 1483 dev_err(tc->dev, "main link enable error: %d\n", ret); 1484 return; 1485 } 1486 1487 ret = tc_edp_stream_enable(tc); 1488 if (ret < 0) { 1489 dev_err(tc->dev, "main link stream start error: %d\n", ret); 1490 tc_main_link_disable(tc); 1491 return; 1492 } 1493 } 1494 1495 static void 1496 tc_edp_bridge_atomic_disable(struct drm_bridge *bridge, 1497 struct drm_bridge_state *old_bridge_state) 1498 { 1499 struct tc_data *tc = bridge_to_tc(bridge); 1500 int ret; 1501 1502 ret = tc_edp_stream_disable(tc); 1503 if (ret < 0) 1504 dev_err(tc->dev, "main link stream stop error: %d\n", ret); 1505 1506 ret = tc_main_link_disable(tc); 1507 if (ret < 0) 1508 dev_err(tc->dev, "main link disable error: %d\n", ret); 1509 } 1510 1511 static int tc_dpi_atomic_check(struct drm_bridge *bridge, 1512 struct drm_bridge_state *bridge_state, 1513 struct drm_crtc_state *crtc_state, 1514 struct drm_connector_state *conn_state) 1515 { 1516 /* DSI->DPI interface clock limitation: upto 100 MHz */ 1517 if (crtc_state->adjusted_mode.clock > 100000) 1518 return -EINVAL; 1519 1520 return 0; 1521 } 1522 1523 static int tc_edp_atomic_check(struct drm_bridge *bridge, 1524 struct drm_bridge_state *bridge_state, 1525 struct drm_crtc_state *crtc_state, 1526 struct drm_connector_state *conn_state) 1527 { 1528 /* DPI->(e)DP interface clock limitation: upto 154 MHz */ 1529 if (crtc_state->adjusted_mode.clock > 154000) 1530 return -EINVAL; 1531 1532 return 0; 1533 } 1534 1535 static enum drm_mode_status 1536 tc_dpi_mode_valid(struct drm_bridge *bridge, 1537 const struct drm_display_info *info, 1538 const struct drm_display_mode *mode) 1539 { 1540 /* DPI interface clock limitation: upto 100 MHz */ 1541 if (mode->clock > 100000) 1542 return MODE_CLOCK_HIGH; 1543 1544 return MODE_OK; 1545 } 1546 1547 static enum drm_mode_status 1548 tc_edp_mode_valid(struct drm_bridge *bridge, 1549 const struct drm_display_info *info, 1550 const struct drm_display_mode *mode) 1551 { 1552 struct tc_data *tc = bridge_to_tc(bridge); 1553 u32 req, avail; 1554 u32 bits_per_pixel = 24; 1555 1556 /* DPI interface clock limitation: upto 154 MHz */ 1557 if (mode->clock > 154000) 1558 return MODE_CLOCK_HIGH; 1559 1560 req = mode->clock * bits_per_pixel / 8; 1561 avail = tc->link.num_lanes * tc->link.rate; 1562 1563 if (req > avail) 1564 return MODE_BAD; 1565 1566 return MODE_OK; 1567 } 1568 1569 static void tc_bridge_mode_set(struct drm_bridge *bridge, 1570 const struct drm_display_mode *mode, 1571 const struct drm_display_mode *adj) 1572 { 1573 struct tc_data *tc = bridge_to_tc(bridge); 1574 1575 drm_mode_copy(&tc->mode, mode); 1576 } 1577 1578 static struct edid *tc_get_edid(struct drm_bridge *bridge, 1579 struct drm_connector *connector) 1580 { 1581 struct tc_data *tc = bridge_to_tc(bridge); 1582 1583 return drm_get_edid(connector, &tc->aux.ddc); 1584 } 1585 1586 static int tc_connector_get_modes(struct drm_connector *connector) 1587 { 1588 struct tc_data *tc = connector_to_tc(connector); 1589 int num_modes; 1590 struct edid *edid; 1591 int ret; 1592 1593 ret = tc_get_display_props(tc); 1594 if (ret < 0) { 1595 dev_err(tc->dev, "failed to read display props: %d\n", ret); 1596 return 0; 1597 } 1598 1599 if (tc->panel_bridge) { 1600 num_modes = drm_bridge_get_modes(tc->panel_bridge, connector); 1601 if (num_modes > 0) 1602 return num_modes; 1603 } 1604 1605 edid = tc_get_edid(&tc->bridge, connector); 1606 num_modes = drm_add_edid_modes(connector, edid); 1607 kfree(edid); 1608 1609 return num_modes; 1610 } 1611 1612 static const struct drm_connector_helper_funcs tc_connector_helper_funcs = { 1613 .get_modes = tc_connector_get_modes, 1614 }; 1615 1616 static enum drm_connector_status tc_bridge_detect(struct drm_bridge *bridge) 1617 { 1618 struct tc_data *tc = bridge_to_tc(bridge); 1619 bool conn; 1620 u32 val; 1621 int ret; 1622 1623 ret = regmap_read(tc->regmap, GPIOI, &val); 1624 if (ret) 1625 return connector_status_unknown; 1626 1627 conn = val & BIT(tc->hpd_pin); 1628 1629 if (conn) 1630 return connector_status_connected; 1631 else 1632 return connector_status_disconnected; 1633 } 1634 1635 static enum drm_connector_status 1636 tc_connector_detect(struct drm_connector *connector, bool force) 1637 { 1638 struct tc_data *tc = connector_to_tc(connector); 1639 1640 if (tc->hpd_pin >= 0) 1641 return tc_bridge_detect(&tc->bridge); 1642 1643 if (tc->panel_bridge) 1644 return connector_status_connected; 1645 else 1646 return connector_status_unknown; 1647 } 1648 1649 static const struct drm_connector_funcs tc_connector_funcs = { 1650 .detect = tc_connector_detect, 1651 .fill_modes = drm_helper_probe_single_connector_modes, 1652 .destroy = drm_connector_cleanup, 1653 .reset = drm_atomic_helper_connector_reset, 1654 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 1655 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 1656 }; 1657 1658 static int tc_dpi_bridge_attach(struct drm_bridge *bridge, 1659 enum drm_bridge_attach_flags flags) 1660 { 1661 struct tc_data *tc = bridge_to_tc(bridge); 1662 1663 if (!tc->panel_bridge) 1664 return 0; 1665 1666 return drm_bridge_attach(tc->bridge.encoder, tc->panel_bridge, 1667 &tc->bridge, flags); 1668 } 1669 1670 static int tc_edp_bridge_attach(struct drm_bridge *bridge, 1671 enum drm_bridge_attach_flags flags) 1672 { 1673 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 1674 struct tc_data *tc = bridge_to_tc(bridge); 1675 struct drm_device *drm = bridge->dev; 1676 int ret; 1677 1678 if (tc->panel_bridge) { 1679 /* If a connector is required then this driver shall create it */ 1680 ret = drm_bridge_attach(tc->bridge.encoder, tc->panel_bridge, 1681 &tc->bridge, flags | DRM_BRIDGE_ATTACH_NO_CONNECTOR); 1682 if (ret) 1683 return ret; 1684 } 1685 1686 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) 1687 return 0; 1688 1689 tc->aux.drm_dev = drm; 1690 ret = drm_dp_aux_register(&tc->aux); 1691 if (ret < 0) 1692 return ret; 1693 1694 /* Create DP/eDP connector */ 1695 drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs); 1696 ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs, tc->bridge.type); 1697 if (ret) 1698 goto aux_unregister; 1699 1700 /* Don't poll if don't have HPD connected */ 1701 if (tc->hpd_pin >= 0) { 1702 if (tc->have_irq) 1703 tc->connector.polled = DRM_CONNECTOR_POLL_HPD; 1704 else 1705 tc->connector.polled = DRM_CONNECTOR_POLL_CONNECT | 1706 DRM_CONNECTOR_POLL_DISCONNECT; 1707 } 1708 1709 drm_display_info_set_bus_formats(&tc->connector.display_info, 1710 &bus_format, 1); 1711 tc->connector.display_info.bus_flags = 1712 DRM_BUS_FLAG_DE_HIGH | 1713 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE | 1714 DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE; 1715 drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder); 1716 1717 return 0; 1718 aux_unregister: 1719 drm_dp_aux_unregister(&tc->aux); 1720 return ret; 1721 } 1722 1723 static void tc_edp_bridge_detach(struct drm_bridge *bridge) 1724 { 1725 drm_dp_aux_unregister(&bridge_to_tc(bridge)->aux); 1726 } 1727 1728 #define MAX_INPUT_SEL_FORMATS 1 1729 1730 static u32 * 1731 tc_dpi_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 1732 struct drm_bridge_state *bridge_state, 1733 struct drm_crtc_state *crtc_state, 1734 struct drm_connector_state *conn_state, 1735 u32 output_fmt, 1736 unsigned int *num_input_fmts) 1737 { 1738 u32 *input_fmts; 1739 1740 *num_input_fmts = 0; 1741 1742 input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts), 1743 GFP_KERNEL); 1744 if (!input_fmts) 1745 return NULL; 1746 1747 /* This is the DSI-end bus format */ 1748 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24; 1749 *num_input_fmts = 1; 1750 1751 return input_fmts; 1752 } 1753 1754 static const struct drm_bridge_funcs tc_dpi_bridge_funcs = { 1755 .attach = tc_dpi_bridge_attach, 1756 .mode_valid = tc_dpi_mode_valid, 1757 .mode_set = tc_bridge_mode_set, 1758 .atomic_check = tc_dpi_atomic_check, 1759 .atomic_enable = tc_dpi_bridge_atomic_enable, 1760 .atomic_disable = tc_dpi_bridge_atomic_disable, 1761 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 1762 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 1763 .atomic_reset = drm_atomic_helper_bridge_reset, 1764 .atomic_get_input_bus_fmts = tc_dpi_atomic_get_input_bus_fmts, 1765 }; 1766 1767 static const struct drm_bridge_funcs tc_edp_bridge_funcs = { 1768 .attach = tc_edp_bridge_attach, 1769 .detach = tc_edp_bridge_detach, 1770 .mode_valid = tc_edp_mode_valid, 1771 .mode_set = tc_bridge_mode_set, 1772 .atomic_check = tc_edp_atomic_check, 1773 .atomic_enable = tc_edp_bridge_atomic_enable, 1774 .atomic_disable = tc_edp_bridge_atomic_disable, 1775 .detect = tc_bridge_detect, 1776 .get_edid = tc_get_edid, 1777 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 1778 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 1779 .atomic_reset = drm_atomic_helper_bridge_reset, 1780 }; 1781 1782 static bool tc_readable_reg(struct device *dev, unsigned int reg) 1783 { 1784 return reg != SYSCTRL; 1785 } 1786 1787 static const struct regmap_range tc_volatile_ranges[] = { 1788 regmap_reg_range(DP0_AUXWDATA(0), DP0_AUXSTATUS), 1789 regmap_reg_range(DP0_LTSTAT, DP0_SNKLTCHGREQ), 1790 regmap_reg_range(DP_PHY_CTRL, DP_PHY_CTRL), 1791 regmap_reg_range(DP0_PLLCTRL, PXL_PLLCTRL), 1792 regmap_reg_range(VFUEN0, VFUEN0), 1793 regmap_reg_range(INTSTS_G, INTSTS_G), 1794 regmap_reg_range(GPIOI, GPIOI), 1795 }; 1796 1797 static const struct regmap_access_table tc_volatile_table = { 1798 .yes_ranges = tc_volatile_ranges, 1799 .n_yes_ranges = ARRAY_SIZE(tc_volatile_ranges), 1800 }; 1801 1802 static bool tc_writeable_reg(struct device *dev, unsigned int reg) 1803 { 1804 return (reg != TC_IDREG) && 1805 (reg != DP0_LTSTAT) && 1806 (reg != DP0_SNKLTCHGREQ); 1807 } 1808 1809 static const struct regmap_config tc_regmap_config = { 1810 .name = "tc358767", 1811 .reg_bits = 16, 1812 .val_bits = 32, 1813 .reg_stride = 4, 1814 .max_register = PLL_DBG, 1815 .cache_type = REGCACHE_RBTREE, 1816 .readable_reg = tc_readable_reg, 1817 .volatile_table = &tc_volatile_table, 1818 .writeable_reg = tc_writeable_reg, 1819 .reg_format_endian = REGMAP_ENDIAN_BIG, 1820 .val_format_endian = REGMAP_ENDIAN_LITTLE, 1821 }; 1822 1823 static irqreturn_t tc_irq_handler(int irq, void *arg) 1824 { 1825 struct tc_data *tc = arg; 1826 u32 val; 1827 int r; 1828 1829 r = regmap_read(tc->regmap, INTSTS_G, &val); 1830 if (r) 1831 return IRQ_NONE; 1832 1833 if (!val) 1834 return IRQ_NONE; 1835 1836 if (val & INT_SYSERR) { 1837 u32 stat = 0; 1838 1839 regmap_read(tc->regmap, SYSSTAT, &stat); 1840 1841 dev_err(tc->dev, "syserr %x\n", stat); 1842 } 1843 1844 if (tc->hpd_pin >= 0 && tc->bridge.dev) { 1845 /* 1846 * H is triggered when the GPIO goes high. 1847 * 1848 * LC is triggered when the GPIO goes low and stays low for 1849 * the duration of LCNT 1850 */ 1851 bool h = val & INT_GPIO_H(tc->hpd_pin); 1852 bool lc = val & INT_GPIO_LC(tc->hpd_pin); 1853 1854 dev_dbg(tc->dev, "GPIO%d: %s %s\n", tc->hpd_pin, 1855 h ? "H" : "", lc ? "LC" : ""); 1856 1857 if (h || lc) 1858 drm_kms_helper_hotplug_event(tc->bridge.dev); 1859 } 1860 1861 regmap_write(tc->regmap, INTSTS_G, val); 1862 1863 return IRQ_HANDLED; 1864 } 1865 1866 static int tc_mipi_dsi_host_attach(struct tc_data *tc) 1867 { 1868 struct device *dev = tc->dev; 1869 struct device_node *host_node; 1870 struct device_node *endpoint; 1871 struct mipi_dsi_device *dsi; 1872 struct mipi_dsi_host *host; 1873 const struct mipi_dsi_device_info info = { 1874 .type = "tc358767", 1875 .channel = 0, 1876 .node = NULL, 1877 }; 1878 int dsi_lanes, ret; 1879 1880 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); 1881 dsi_lanes = drm_of_get_data_lanes_count(endpoint, 1, 4); 1882 host_node = of_graph_get_remote_port_parent(endpoint); 1883 host = of_find_mipi_dsi_host_by_node(host_node); 1884 of_node_put(host_node); 1885 of_node_put(endpoint); 1886 1887 if (!host) 1888 return -EPROBE_DEFER; 1889 1890 if (dsi_lanes < 0) 1891 return dsi_lanes; 1892 1893 dsi = mipi_dsi_device_register_full(host, &info); 1894 if (IS_ERR(dsi)) 1895 return dev_err_probe(dev, PTR_ERR(dsi), 1896 "failed to create dsi device\n"); 1897 1898 tc->dsi = dsi; 1899 dsi->lanes = dsi_lanes; 1900 dsi->format = MIPI_DSI_FMT_RGB888; 1901 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | 1902 MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS; 1903 1904 ret = mipi_dsi_attach(dsi); 1905 if (ret < 0) { 1906 dev_err(dev, "failed to attach dsi to host: %d\n", ret); 1907 return ret; 1908 } 1909 1910 return 0; 1911 } 1912 1913 static int tc_probe_dpi_bridge_endpoint(struct tc_data *tc) 1914 { 1915 struct device *dev = tc->dev; 1916 struct drm_bridge *bridge; 1917 struct drm_panel *panel; 1918 int ret; 1919 1920 /* port@1 is the DPI input/output port */ 1921 ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, &bridge); 1922 if (ret && ret != -ENODEV) 1923 return ret; 1924 1925 if (panel) { 1926 bridge = devm_drm_panel_bridge_add(dev, panel); 1927 if (IS_ERR(bridge)) 1928 return PTR_ERR(bridge); 1929 } 1930 1931 if (bridge) { 1932 tc->panel_bridge = bridge; 1933 tc->bridge.type = DRM_MODE_CONNECTOR_DPI; 1934 tc->bridge.funcs = &tc_dpi_bridge_funcs; 1935 1936 return 0; 1937 } 1938 1939 return ret; 1940 } 1941 1942 static int tc_probe_edp_bridge_endpoint(struct tc_data *tc) 1943 { 1944 struct device *dev = tc->dev; 1945 struct drm_panel *panel; 1946 int ret; 1947 1948 /* port@2 is the output port */ 1949 ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &panel, NULL); 1950 if (ret && ret != -ENODEV) 1951 return ret; 1952 1953 if (panel) { 1954 struct drm_bridge *panel_bridge; 1955 1956 panel_bridge = devm_drm_panel_bridge_add(dev, panel); 1957 if (IS_ERR(panel_bridge)) 1958 return PTR_ERR(panel_bridge); 1959 1960 tc->panel_bridge = panel_bridge; 1961 tc->bridge.type = DRM_MODE_CONNECTOR_eDP; 1962 } else { 1963 tc->bridge.type = DRM_MODE_CONNECTOR_DisplayPort; 1964 } 1965 1966 tc->bridge.funcs = &tc_edp_bridge_funcs; 1967 if (tc->hpd_pin >= 0) 1968 tc->bridge.ops |= DRM_BRIDGE_OP_DETECT; 1969 tc->bridge.ops |= DRM_BRIDGE_OP_EDID; 1970 1971 return 0; 1972 } 1973 1974 static int tc_probe_bridge_endpoint(struct tc_data *tc) 1975 { 1976 struct device *dev = tc->dev; 1977 struct of_endpoint endpoint; 1978 struct device_node *node = NULL; 1979 const u8 mode_dpi_to_edp = BIT(1) | BIT(2); 1980 const u8 mode_dpi_to_dp = BIT(1); 1981 const u8 mode_dsi_to_edp = BIT(0) | BIT(2); 1982 const u8 mode_dsi_to_dp = BIT(0); 1983 const u8 mode_dsi_to_dpi = BIT(0) | BIT(1); 1984 u8 mode = 0; 1985 1986 /* 1987 * Determine bridge configuration. 1988 * 1989 * Port allocation: 1990 * port@0 - DSI input 1991 * port@1 - DPI input/output 1992 * port@2 - eDP output 1993 * 1994 * Possible connections: 1995 * DPI -> port@1 -> port@2 -> eDP :: [port@0 is not connected] 1996 * DSI -> port@0 -> port@2 -> eDP :: [port@1 is not connected] 1997 * DSI -> port@0 -> port@1 -> DPI :: [port@2 is not connected] 1998 */ 1999 2000 for_each_endpoint_of_node(dev->of_node, node) { 2001 of_graph_parse_endpoint(node, &endpoint); 2002 if (endpoint.port > 2) { 2003 of_node_put(node); 2004 return -EINVAL; 2005 } 2006 mode |= BIT(endpoint.port); 2007 } 2008 2009 if (mode == mode_dpi_to_edp || mode == mode_dpi_to_dp) { 2010 tc->input_connector_dsi = false; 2011 return tc_probe_edp_bridge_endpoint(tc); 2012 } else if (mode == mode_dsi_to_dpi) { 2013 tc->input_connector_dsi = true; 2014 return tc_probe_dpi_bridge_endpoint(tc); 2015 } else if (mode == mode_dsi_to_edp || mode == mode_dsi_to_dp) { 2016 tc->input_connector_dsi = true; 2017 return tc_probe_edp_bridge_endpoint(tc); 2018 } 2019 2020 dev_warn(dev, "Invalid mode (0x%x) is not supported!\n", mode); 2021 2022 return -EINVAL; 2023 } 2024 2025 static void tc_clk_disable(void *data) 2026 { 2027 struct clk *refclk = data; 2028 2029 clk_disable_unprepare(refclk); 2030 } 2031 2032 static int tc_probe(struct i2c_client *client) 2033 { 2034 struct device *dev = &client->dev; 2035 struct tc_data *tc; 2036 int ret; 2037 2038 tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL); 2039 if (!tc) 2040 return -ENOMEM; 2041 2042 tc->dev = dev; 2043 2044 ret = tc_probe_bridge_endpoint(tc); 2045 if (ret) 2046 return ret; 2047 2048 tc->refclk = devm_clk_get(dev, "ref"); 2049 if (IS_ERR(tc->refclk)) { 2050 ret = PTR_ERR(tc->refclk); 2051 dev_err(dev, "Failed to get refclk: %d\n", ret); 2052 return ret; 2053 } 2054 2055 ret = clk_prepare_enable(tc->refclk); 2056 if (ret) 2057 return ret; 2058 2059 ret = devm_add_action_or_reset(dev, tc_clk_disable, tc->refclk); 2060 if (ret) 2061 return ret; 2062 2063 /* tRSTW = 100 cycles , at 13 MHz that is ~7.69 us */ 2064 usleep_range(10, 15); 2065 2066 /* Shut down GPIO is optional */ 2067 tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH); 2068 if (IS_ERR(tc->sd_gpio)) 2069 return PTR_ERR(tc->sd_gpio); 2070 2071 if (tc->sd_gpio) { 2072 gpiod_set_value_cansleep(tc->sd_gpio, 0); 2073 usleep_range(5000, 10000); 2074 } 2075 2076 /* Reset GPIO is optional */ 2077 tc->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 2078 if (IS_ERR(tc->reset_gpio)) 2079 return PTR_ERR(tc->reset_gpio); 2080 2081 if (tc->reset_gpio) { 2082 gpiod_set_value_cansleep(tc->reset_gpio, 1); 2083 usleep_range(5000, 10000); 2084 } 2085 2086 tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config); 2087 if (IS_ERR(tc->regmap)) { 2088 ret = PTR_ERR(tc->regmap); 2089 dev_err(dev, "Failed to initialize regmap: %d\n", ret); 2090 return ret; 2091 } 2092 2093 ret = of_property_read_u32(dev->of_node, "toshiba,hpd-pin", 2094 &tc->hpd_pin); 2095 if (ret) { 2096 tc->hpd_pin = -ENODEV; 2097 } else { 2098 if (tc->hpd_pin < 0 || tc->hpd_pin > 1) { 2099 dev_err(dev, "failed to parse HPD number\n"); 2100 return ret; 2101 } 2102 } 2103 2104 if (client->irq > 0) { 2105 /* enable SysErr */ 2106 regmap_write(tc->regmap, INTCTL_G, INT_SYSERR); 2107 2108 ret = devm_request_threaded_irq(dev, client->irq, 2109 NULL, tc_irq_handler, 2110 IRQF_ONESHOT, 2111 "tc358767-irq", tc); 2112 if (ret) { 2113 dev_err(dev, "failed to register dp interrupt\n"); 2114 return ret; 2115 } 2116 2117 tc->have_irq = true; 2118 } 2119 2120 ret = regmap_read(tc->regmap, TC_IDREG, &tc->rev); 2121 if (ret) { 2122 dev_err(tc->dev, "can not read device ID: %d\n", ret); 2123 return ret; 2124 } 2125 2126 if ((tc->rev != 0x6601) && (tc->rev != 0x6603)) { 2127 dev_err(tc->dev, "invalid device ID: 0x%08x\n", tc->rev); 2128 return -EINVAL; 2129 } 2130 2131 tc->assr = (tc->rev == 0x6601); /* Enable ASSR for eDP panels */ 2132 2133 if (!tc->reset_gpio) { 2134 /* 2135 * If the reset pin isn't present, do a software reset. It isn't 2136 * as thorough as the hardware reset, as we can't reset the I2C 2137 * communication block for obvious reasons, but it's getting the 2138 * chip into a defined state. 2139 */ 2140 regmap_update_bits(tc->regmap, SYSRSTENB, 2141 ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP, 2142 0); 2143 regmap_update_bits(tc->regmap, SYSRSTENB, 2144 ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP, 2145 ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP); 2146 usleep_range(5000, 10000); 2147 } 2148 2149 if (tc->hpd_pin >= 0) { 2150 u32 lcnt_reg = tc->hpd_pin == 0 ? INT_GP0_LCNT : INT_GP1_LCNT; 2151 u32 h_lc = INT_GPIO_H(tc->hpd_pin) | INT_GPIO_LC(tc->hpd_pin); 2152 2153 /* Set LCNT to 2ms */ 2154 regmap_write(tc->regmap, lcnt_reg, 2155 clk_get_rate(tc->refclk) * 2 / 1000); 2156 /* We need the "alternate" mode for HPD */ 2157 regmap_write(tc->regmap, GPIOM, BIT(tc->hpd_pin)); 2158 2159 if (tc->have_irq) { 2160 /* enable H & LC */ 2161 regmap_update_bits(tc->regmap, INTCTL_G, h_lc, h_lc); 2162 } 2163 } 2164 2165 if (tc->bridge.type != DRM_MODE_CONNECTOR_DPI) { /* (e)DP output */ 2166 ret = tc_aux_link_setup(tc); 2167 if (ret) 2168 return ret; 2169 } 2170 2171 tc->bridge.of_node = dev->of_node; 2172 drm_bridge_add(&tc->bridge); 2173 2174 i2c_set_clientdata(client, tc); 2175 2176 if (tc->input_connector_dsi) { /* DSI input */ 2177 ret = tc_mipi_dsi_host_attach(tc); 2178 if (ret) { 2179 drm_bridge_remove(&tc->bridge); 2180 return ret; 2181 } 2182 } 2183 2184 return 0; 2185 } 2186 2187 static void tc_remove(struct i2c_client *client) 2188 { 2189 struct tc_data *tc = i2c_get_clientdata(client); 2190 2191 drm_bridge_remove(&tc->bridge); 2192 } 2193 2194 static const struct i2c_device_id tc358767_i2c_ids[] = { 2195 { "tc358767", 0 }, 2196 { } 2197 }; 2198 MODULE_DEVICE_TABLE(i2c, tc358767_i2c_ids); 2199 2200 static const struct of_device_id tc358767_of_ids[] = { 2201 { .compatible = "toshiba,tc358767", }, 2202 { } 2203 }; 2204 MODULE_DEVICE_TABLE(of, tc358767_of_ids); 2205 2206 static struct i2c_driver tc358767_driver = { 2207 .driver = { 2208 .name = "tc358767", 2209 .of_match_table = tc358767_of_ids, 2210 }, 2211 .id_table = tc358767_i2c_ids, 2212 .probe_new = tc_probe, 2213 .remove = tc_remove, 2214 }; 2215 module_i2c_driver(tc358767_driver); 2216 2217 MODULE_AUTHOR("Andrey Gusakov <andrey.gusakov@cogentembedded.com>"); 2218 MODULE_DESCRIPTION("tc358767 eDP encoder driver"); 2219 MODULE_LICENSE("GPL"); 2220