1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright(c) 2016, Analogix Semiconductor. 4 * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io> 5 * 6 * Based on anx7808 driver obtained from chromeos with copyright: 7 * Copyright(c) 2013, Google Inc. 8 */ 9 #include <linux/delay.h> 10 #include <linux/err.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/i2c.h> 13 #include <linux/interrupt.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/of_platform.h> 17 #include <linux/regmap.h> 18 #include <linux/regulator/consumer.h> 19 #include <linux/types.h> 20 21 #include <drm/display/drm_dp_helper.h> 22 #include <drm/drm_atomic_helper.h> 23 #include <drm/drm_bridge.h> 24 #include <drm/drm_crtc.h> 25 #include <drm/drm_edid.h> 26 #include <drm/drm_of.h> 27 #include <drm/drm_panel.h> 28 #include <drm/drm_print.h> 29 #include <drm/drm_probe_helper.h> 30 31 #include "analogix-i2c-dptx.h" 32 #include "analogix-i2c-txcommon.h" 33 34 #define POLL_DELAY 50000 /* us */ 35 #define POLL_TIMEOUT 5000000 /* us */ 36 37 #define I2C_IDX_DPTX 0 38 #define I2C_IDX_TXCOM 1 39 40 static const u8 anx6345_i2c_addresses[] = { 41 [I2C_IDX_DPTX] = 0x70, 42 [I2C_IDX_TXCOM] = 0x72, 43 }; 44 #define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses) 45 46 struct anx6345 { 47 struct drm_dp_aux aux; 48 struct drm_bridge bridge; 49 struct i2c_client *client; 50 struct edid *edid; 51 struct drm_connector connector; 52 struct drm_panel *panel; 53 struct regulator *dvdd12; 54 struct regulator *dvdd25; 55 struct gpio_desc *gpiod_reset; 56 struct mutex lock; /* protect EDID access */ 57 58 /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */ 59 struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES]; 60 struct regmap *map[I2C_NUM_ADDRESSES]; 61 62 u16 chipid; 63 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 64 65 bool powered; 66 }; 67 68 static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c) 69 { 70 return container_of(c, struct anx6345, connector); 71 } 72 73 static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge) 74 { 75 return container_of(bridge, struct anx6345, bridge); 76 } 77 78 static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask) 79 { 80 return regmap_update_bits(map, reg, mask, mask); 81 } 82 83 static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask) 84 { 85 return regmap_update_bits(map, reg, mask, 0); 86 } 87 88 static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux, 89 struct drm_dp_aux_msg *msg) 90 { 91 struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux); 92 93 return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg); 94 } 95 96 static int anx6345_dp_link_training(struct anx6345 *anx6345) 97 { 98 unsigned int value; 99 u8 dp_bw, dpcd[2]; 100 int err; 101 102 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 103 SP_POWERDOWN_CTRL_REG, 104 SP_TOTAL_PD); 105 if (err) 106 return err; 107 108 err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw); 109 if (err < 0) 110 return err; 111 112 switch (dp_bw) { 113 case DP_LINK_BW_1_62: 114 case DP_LINK_BW_2_7: 115 break; 116 117 default: 118 DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw); 119 return -EINVAL; 120 } 121 122 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 123 SP_VIDEO_MUTE); 124 if (err) 125 return err; 126 127 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 128 SP_VID_CTRL1_REG, SP_VIDEO_EN); 129 if (err) 130 return err; 131 132 /* Get DPCD info */ 133 err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV, 134 &anx6345->dpcd, DP_RECEIVER_CAP_SIZE); 135 if (err < 0) { 136 DRM_ERROR("Failed to read DPCD: %d\n", err); 137 return err; 138 } 139 140 /* Clear channel x SERDES power down */ 141 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 142 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD); 143 if (err) 144 return err; 145 146 /* 147 * Power up the sink (DP_SET_POWER register is only available on DPCD 148 * v1.1 and later). 149 */ 150 if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) { 151 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]); 152 if (err < 0) { 153 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n", 154 err); 155 return err; 156 } 157 158 dpcd[0] &= ~DP_SET_POWER_MASK; 159 dpcd[0] |= DP_SET_POWER_D0; 160 161 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]); 162 if (err < 0) { 163 DRM_ERROR("Failed to power up DisplayPort link: %d\n", 164 err); 165 return err; 166 } 167 168 /* 169 * According to the DP 1.1 specification, a "Sink Device must 170 * exit the power saving state within 1 ms" (Section 2.5.3.1, 171 * Table 5-52, "Sink Control Field" (register 0x600). 172 */ 173 usleep_range(1000, 2000); 174 } 175 176 /* Possibly enable downspread on the sink */ 177 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 178 SP_DP_DOWNSPREAD_CTRL1_REG, 0); 179 if (err) 180 return err; 181 182 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) { 183 DRM_DEBUG("Enable downspread on the sink\n"); 184 /* 4000PPM */ 185 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 186 SP_DP_DOWNSPREAD_CTRL1_REG, 8); 187 if (err) 188 return err; 189 190 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 191 DP_SPREAD_AMP_0_5); 192 if (err < 0) 193 return err; 194 } else { 195 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0); 196 if (err < 0) 197 return err; 198 } 199 200 /* Set the lane count and the link rate on the sink */ 201 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 202 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 203 SP_DP_SYSTEM_CTRL_BASE + 4, 204 SP_ENHANCED_MODE); 205 else 206 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 207 SP_DP_SYSTEM_CTRL_BASE + 4, 208 SP_ENHANCED_MODE); 209 if (err) 210 return err; 211 212 dpcd[0] = dp_bw; 213 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 214 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]); 215 if (err) 216 return err; 217 218 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd); 219 220 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 221 SP_DP_LANE_COUNT_SET_REG, dpcd[1]); 222 if (err) 223 return err; 224 225 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 226 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 227 228 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd, 229 sizeof(dpcd)); 230 231 if (err < 0) { 232 DRM_ERROR("Failed to configure link: %d\n", err); 233 return err; 234 } 235 236 /* Start training on the source */ 237 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, 238 SP_LT_EN); 239 if (err) 240 return err; 241 242 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], 243 SP_DP_LT_CTRL_REG, 244 value, !(value & SP_DP_LT_INPROGRESS), 245 POLL_DELAY, POLL_TIMEOUT); 246 } 247 248 static int anx6345_tx_initialization(struct anx6345 *anx6345) 249 { 250 int err, i; 251 252 /* FIXME: colordepth is hardcoded for now */ 253 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, 254 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); 255 if (err) 256 return err; 257 258 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); 259 if (err) 260 return err; 261 262 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], 263 SP_ANALOG_DEBUG1_REG, 0); 264 if (err) 265 return err; 266 267 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 268 SP_DP_LINK_DEBUG_CTRL_REG, 269 SP_NEW_PRBS7 | SP_M_VID_DEBUG); 270 if (err) 271 return err; 272 273 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 274 SP_DP_ANALOG_POWER_DOWN_REG, 0); 275 if (err) 276 return err; 277 278 /* Force HPD */ 279 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 280 SP_DP_SYSTEM_CTRL_BASE + 3, 281 SP_HPD_FORCE | SP_HPD_CTRL); 282 if (err) 283 return err; 284 285 for (i = 0; i < 4; i++) { 286 /* 4 lanes */ 287 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 288 SP_DP_LANE0_LT_CTRL_REG + i, 0); 289 if (err) 290 return err; 291 } 292 293 /* Reset AUX */ 294 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], 295 SP_RESET_CTRL2_REG, SP_AUX_RST); 296 if (err) 297 return err; 298 299 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 300 SP_RESET_CTRL2_REG, SP_AUX_RST); 301 } 302 303 static void anx6345_poweron(struct anx6345 *anx6345) 304 { 305 int err; 306 307 /* Ensure reset is asserted before starting power on sequence */ 308 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 309 usleep_range(1000, 2000); 310 311 err = regulator_enable(anx6345->dvdd12); 312 if (err) { 313 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", 314 err); 315 return; 316 } 317 318 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ 319 usleep_range(1000, 2000); 320 321 err = regulator_enable(anx6345->dvdd25); 322 if (err) { 323 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", 324 err); 325 return; 326 } 327 328 /* T2 - delay between RESETN and all power rail stable, 329 * should be 2-5ms 330 */ 331 usleep_range(2000, 5000); 332 333 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); 334 335 /* Power on registers module */ 336 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 337 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 338 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 339 SP_REGISTER_PD | SP_TOTAL_PD); 340 341 if (anx6345->panel) 342 drm_panel_prepare(anx6345->panel); 343 344 anx6345->powered = true; 345 } 346 347 static void anx6345_poweroff(struct anx6345 *anx6345) 348 { 349 int err; 350 351 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 352 usleep_range(1000, 2000); 353 354 if (anx6345->panel) 355 drm_panel_unprepare(anx6345->panel); 356 357 err = regulator_disable(anx6345->dvdd25); 358 if (err) { 359 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", 360 err); 361 return; 362 } 363 364 usleep_range(5000, 10000); 365 366 err = regulator_disable(anx6345->dvdd12); 367 if (err) { 368 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", 369 err); 370 return; 371 } 372 373 usleep_range(1000, 2000); 374 375 anx6345->powered = false; 376 } 377 378 static int anx6345_start(struct anx6345 *anx6345) 379 { 380 int err; 381 382 if (!anx6345->powered) 383 anx6345_poweron(anx6345); 384 385 /* Power on needed modules */ 386 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 387 SP_POWERDOWN_CTRL_REG, 388 SP_VIDEO_PD | SP_LINK_PD); 389 390 err = anx6345_tx_initialization(anx6345); 391 if (err) { 392 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); 393 anx6345_poweroff(anx6345); 394 return err; 395 } 396 397 err = anx6345_dp_link_training(anx6345); 398 if (err) { 399 DRM_ERROR("Failed link training: %d\n", err); 400 anx6345_poweroff(anx6345); 401 return err; 402 } 403 404 /* 405 * This delay seems to help keep the hardware in a good state. Without 406 * it, there are times where it fails silently. 407 */ 408 usleep_range(10000, 15000); 409 410 return 0; 411 } 412 413 static int anx6345_config_dp_output(struct anx6345 *anx6345) 414 { 415 int err; 416 417 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 418 SP_VIDEO_MUTE); 419 if (err) 420 return err; 421 422 /* Enable DP output */ 423 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 424 SP_VIDEO_EN); 425 if (err) 426 return err; 427 428 /* Force stream valid */ 429 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 430 SP_DP_SYSTEM_CTRL_BASE + 3, 431 SP_STRM_FORCE | SP_STRM_CTRL); 432 } 433 434 static int anx6345_get_downstream_info(struct anx6345 *anx6345) 435 { 436 u8 value; 437 int err; 438 439 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); 440 if (err < 0) { 441 DRM_ERROR("Get sink count failed %d\n", err); 442 return err; 443 } 444 445 if (!DP_GET_SINK_COUNT(value)) { 446 DRM_ERROR("Downstream disconnected\n"); 447 return -EIO; 448 } 449 450 return 0; 451 } 452 453 static int anx6345_get_modes(struct drm_connector *connector) 454 { 455 struct anx6345 *anx6345 = connector_to_anx6345(connector); 456 int err, num_modes = 0; 457 bool power_off = false; 458 459 mutex_lock(&anx6345->lock); 460 461 if (!anx6345->edid) { 462 if (!anx6345->powered) { 463 anx6345_poweron(anx6345); 464 power_off = true; 465 } 466 467 err = anx6345_get_downstream_info(anx6345); 468 if (err) { 469 DRM_ERROR("Failed to get downstream info: %d\n", err); 470 goto unlock; 471 } 472 473 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); 474 if (!anx6345->edid) 475 DRM_ERROR("Failed to read EDID from panel\n"); 476 477 err = drm_connector_update_edid_property(connector, 478 anx6345->edid); 479 if (err) { 480 DRM_ERROR("Failed to update EDID property: %d\n", err); 481 goto unlock; 482 } 483 } 484 485 num_modes += drm_add_edid_modes(connector, anx6345->edid); 486 487 /* Driver currently supports only 6bpc */ 488 connector->display_info.bpc = 6; 489 490 unlock: 491 if (power_off) 492 anx6345_poweroff(anx6345); 493 494 mutex_unlock(&anx6345->lock); 495 496 if (!num_modes && anx6345->panel) 497 num_modes += drm_panel_get_modes(anx6345->panel, connector); 498 499 return num_modes; 500 } 501 502 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { 503 .get_modes = anx6345_get_modes, 504 }; 505 506 static void 507 anx6345_connector_destroy(struct drm_connector *connector) 508 { 509 drm_connector_cleanup(connector); 510 } 511 512 static const struct drm_connector_funcs anx6345_connector_funcs = { 513 .fill_modes = drm_helper_probe_single_connector_modes, 514 .destroy = anx6345_connector_destroy, 515 .reset = drm_atomic_helper_connector_reset, 516 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 517 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 518 }; 519 520 static int anx6345_bridge_attach(struct drm_bridge *bridge, 521 enum drm_bridge_attach_flags flags) 522 { 523 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 524 int err; 525 526 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { 527 DRM_ERROR("Fix bridge driver to make connector optional!"); 528 return -EINVAL; 529 } 530 531 if (!bridge->encoder) { 532 DRM_ERROR("Parent encoder object not found"); 533 return -ENODEV; 534 } 535 536 /* Register aux channel */ 537 anx6345->aux.name = "DP-AUX"; 538 anx6345->aux.dev = &anx6345->client->dev; 539 anx6345->aux.drm_dev = bridge->dev; 540 anx6345->aux.transfer = anx6345_aux_transfer; 541 542 err = drm_dp_aux_register(&anx6345->aux); 543 if (err < 0) { 544 DRM_ERROR("Failed to register aux channel: %d\n", err); 545 return err; 546 } 547 548 err = drm_connector_init(bridge->dev, &anx6345->connector, 549 &anx6345_connector_funcs, 550 DRM_MODE_CONNECTOR_eDP); 551 if (err) { 552 DRM_ERROR("Failed to initialize connector: %d\n", err); 553 goto aux_unregister; 554 } 555 556 drm_connector_helper_add(&anx6345->connector, 557 &anx6345_connector_helper_funcs); 558 559 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; 560 561 err = drm_connector_attach_encoder(&anx6345->connector, 562 bridge->encoder); 563 if (err) { 564 DRM_ERROR("Failed to link up connector to encoder: %d\n", err); 565 goto connector_cleanup; 566 } 567 568 err = drm_connector_register(&anx6345->connector); 569 if (err) { 570 DRM_ERROR("Failed to register connector: %d\n", err); 571 goto connector_cleanup; 572 } 573 574 return 0; 575 connector_cleanup: 576 drm_connector_cleanup(&anx6345->connector); 577 aux_unregister: 578 drm_dp_aux_unregister(&anx6345->aux); 579 return err; 580 } 581 582 static void anx6345_bridge_detach(struct drm_bridge *bridge) 583 { 584 drm_dp_aux_unregister(&bridge_to_anx6345(bridge)->aux); 585 } 586 587 static enum drm_mode_status 588 anx6345_bridge_mode_valid(struct drm_bridge *bridge, 589 const struct drm_display_info *info, 590 const struct drm_display_mode *mode) 591 { 592 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 593 return MODE_NO_INTERLACE; 594 595 /* Max 1200p at 5.4 Ghz, one lane */ 596 if (mode->clock > 154000) 597 return MODE_CLOCK_HIGH; 598 599 return MODE_OK; 600 } 601 602 static void anx6345_bridge_disable(struct drm_bridge *bridge) 603 { 604 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 605 606 /* Power off all modules except configuration registers access */ 607 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 608 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 609 if (anx6345->panel) 610 drm_panel_disable(anx6345->panel); 611 612 if (anx6345->powered) 613 anx6345_poweroff(anx6345); 614 } 615 616 static void anx6345_bridge_enable(struct drm_bridge *bridge) 617 { 618 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 619 int err; 620 621 if (anx6345->panel) 622 drm_panel_enable(anx6345->panel); 623 624 err = anx6345_start(anx6345); 625 if (err) { 626 DRM_ERROR("Failed to initialize: %d\n", err); 627 return; 628 } 629 630 err = anx6345_config_dp_output(anx6345); 631 if (err) 632 DRM_ERROR("Failed to enable DP output: %d\n", err); 633 } 634 635 static const struct drm_bridge_funcs anx6345_bridge_funcs = { 636 .attach = anx6345_bridge_attach, 637 .detach = anx6345_bridge_detach, 638 .mode_valid = anx6345_bridge_mode_valid, 639 .disable = anx6345_bridge_disable, 640 .enable = anx6345_bridge_enable, 641 }; 642 643 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) 644 { 645 unsigned int i; 646 647 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) 648 if (anx6345->i2c_clients[i] && 649 anx6345->i2c_clients[i]->addr != anx6345->client->addr) 650 i2c_unregister_device(anx6345->i2c_clients[i]); 651 } 652 653 static const struct regmap_config anx6345_regmap_config = { 654 .reg_bits = 8, 655 .val_bits = 8, 656 .max_register = 0xff, 657 .cache_type = REGCACHE_NONE, 658 }; 659 660 static const u16 anx6345_chipid_list[] = { 661 0x6345, 662 }; 663 664 static bool anx6345_get_chip_id(struct anx6345 *anx6345) 665 { 666 unsigned int i, idl, idh, version; 667 668 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) 669 return false; 670 671 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) 672 return false; 673 674 anx6345->chipid = (u8)idl | ((u8)idh << 8); 675 676 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, 677 &version)) 678 return false; 679 680 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { 681 if (anx6345->chipid == anx6345_chipid_list[i]) { 682 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", 683 anx6345->chipid, version); 684 return true; 685 } 686 } 687 688 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", 689 anx6345->chipid, version); 690 691 return false; 692 } 693 694 static int anx6345_i2c_probe(struct i2c_client *client) 695 { 696 struct anx6345 *anx6345; 697 struct device *dev; 698 int i, err; 699 700 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); 701 if (!anx6345) 702 return -ENOMEM; 703 704 mutex_init(&anx6345->lock); 705 706 anx6345->bridge.of_node = client->dev.of_node; 707 708 anx6345->client = client; 709 i2c_set_clientdata(client, anx6345); 710 711 dev = &anx6345->client->dev; 712 713 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, 714 &anx6345->panel, NULL); 715 if (err == -EPROBE_DEFER) 716 return err; 717 718 if (err) 719 DRM_DEBUG("No panel found\n"); 720 721 /* 1.2V digital core power regulator */ 722 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12"); 723 if (IS_ERR(anx6345->dvdd12)) { 724 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER) 725 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n", 726 PTR_ERR(anx6345->dvdd12)); 727 return PTR_ERR(anx6345->dvdd12); 728 } 729 730 /* 2.5V digital core power regulator */ 731 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25"); 732 if (IS_ERR(anx6345->dvdd25)) { 733 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER) 734 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n", 735 PTR_ERR(anx6345->dvdd25)); 736 return PTR_ERR(anx6345->dvdd25); 737 } 738 739 /* GPIO for chip reset */ 740 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 741 if (IS_ERR(anx6345->gpiod_reset)) { 742 DRM_ERROR("Reset gpio not found\n"); 743 return PTR_ERR(anx6345->gpiod_reset); 744 } 745 746 /* Map slave addresses of ANX6345 */ 747 for (i = 0; i < I2C_NUM_ADDRESSES; i++) { 748 if (anx6345_i2c_addresses[i] >> 1 != client->addr) 749 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter, 750 anx6345_i2c_addresses[i] >> 1); 751 else 752 anx6345->i2c_clients[i] = client; 753 754 if (IS_ERR(anx6345->i2c_clients[i])) { 755 err = PTR_ERR(anx6345->i2c_clients[i]); 756 DRM_ERROR("Failed to reserve I2C bus %02x\n", 757 anx6345_i2c_addresses[i]); 758 goto err_unregister_i2c; 759 } 760 761 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], 762 &anx6345_regmap_config); 763 if (IS_ERR(anx6345->map[i])) { 764 err = PTR_ERR(anx6345->map[i]); 765 DRM_ERROR("Failed regmap initialization %02x\n", 766 anx6345_i2c_addresses[i]); 767 goto err_unregister_i2c; 768 } 769 } 770 771 /* Look for supported chip ID */ 772 anx6345_poweron(anx6345); 773 if (anx6345_get_chip_id(anx6345)) { 774 anx6345->bridge.funcs = &anx6345_bridge_funcs; 775 drm_bridge_add(&anx6345->bridge); 776 777 return 0; 778 } else { 779 anx6345_poweroff(anx6345); 780 err = -ENODEV; 781 } 782 783 err_unregister_i2c: 784 unregister_i2c_dummy_clients(anx6345); 785 return err; 786 } 787 788 static void anx6345_i2c_remove(struct i2c_client *client) 789 { 790 struct anx6345 *anx6345 = i2c_get_clientdata(client); 791 792 drm_bridge_remove(&anx6345->bridge); 793 794 unregister_i2c_dummy_clients(anx6345); 795 796 kfree(anx6345->edid); 797 798 mutex_destroy(&anx6345->lock); 799 } 800 801 static const struct i2c_device_id anx6345_id[] = { 802 { "anx6345", 0 }, 803 { /* sentinel */ } 804 }; 805 MODULE_DEVICE_TABLE(i2c, anx6345_id); 806 807 static const struct of_device_id anx6345_match_table[] = { 808 { .compatible = "analogix,anx6345", }, 809 { /* sentinel */ }, 810 }; 811 MODULE_DEVICE_TABLE(of, anx6345_match_table); 812 813 static struct i2c_driver anx6345_driver = { 814 .driver = { 815 .name = "anx6345", 816 .of_match_table = of_match_ptr(anx6345_match_table), 817 }, 818 .probe_new = anx6345_i2c_probe, 819 .remove = anx6345_i2c_remove, 820 .id_table = anx6345_id, 821 }; 822 module_i2c_driver(anx6345_driver); 823 824 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); 825 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); 826 MODULE_LICENSE("GPL v2"); 827