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/drm_atomic_helper.h> 22 #include <drm/drm_bridge.h> 23 #include <drm/drm_crtc.h> 24 #include <drm/drm_crtc_helper.h> 25 #include <drm/drm_dp_helper.h> 26 #include <drm/drm_edid.h> 27 #include <drm/drm_of.h> 28 #include <drm/drm_panel.h> 29 #include <drm/drm_print.h> 30 #include <drm/drm_probe_helper.h> 31 32 #include "analogix-i2c-dptx.h" 33 #include "analogix-i2c-txcommon.h" 34 35 #define POLL_DELAY 50000 /* us */ 36 #define POLL_TIMEOUT 5000000 /* us */ 37 38 #define I2C_IDX_DPTX 0 39 #define I2C_IDX_TXCOM 1 40 41 static const u8 anx6345_i2c_addresses[] = { 42 [I2C_IDX_DPTX] = 0x70, 43 [I2C_IDX_TXCOM] = 0x72, 44 }; 45 #define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses) 46 47 struct anx6345 { 48 struct drm_dp_aux aux; 49 struct drm_bridge bridge; 50 struct i2c_client *client; 51 struct edid *edid; 52 struct drm_connector connector; 53 struct drm_panel *panel; 54 struct regulator *dvdd12; 55 struct regulator *dvdd25; 56 struct gpio_desc *gpiod_reset; 57 struct mutex lock; /* protect EDID access */ 58 59 /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */ 60 struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES]; 61 struct regmap *map[I2C_NUM_ADDRESSES]; 62 63 u16 chipid; 64 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 65 66 bool powered; 67 }; 68 69 static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c) 70 { 71 return container_of(c, struct anx6345, connector); 72 } 73 74 static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge) 75 { 76 return container_of(bridge, struct anx6345, bridge); 77 } 78 79 static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask) 80 { 81 return regmap_update_bits(map, reg, mask, mask); 82 } 83 84 static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask) 85 { 86 return regmap_update_bits(map, reg, mask, 0); 87 } 88 89 static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux, 90 struct drm_dp_aux_msg *msg) 91 { 92 struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux); 93 94 return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg); 95 } 96 97 static int anx6345_dp_link_training(struct anx6345 *anx6345) 98 { 99 unsigned int value; 100 u8 dp_bw, dpcd[2]; 101 int err; 102 103 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 104 SP_POWERDOWN_CTRL_REG, 105 SP_TOTAL_PD); 106 if (err) 107 return err; 108 109 err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw); 110 if (err < 0) 111 return err; 112 113 switch (dp_bw) { 114 case DP_LINK_BW_1_62: 115 case DP_LINK_BW_2_7: 116 break; 117 118 default: 119 DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw); 120 return -EINVAL; 121 } 122 123 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 124 SP_VIDEO_MUTE); 125 if (err) 126 return err; 127 128 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 129 SP_VID_CTRL1_REG, SP_VIDEO_EN); 130 if (err) 131 return err; 132 133 /* Get DPCD info */ 134 err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV, 135 &anx6345->dpcd, DP_RECEIVER_CAP_SIZE); 136 if (err < 0) { 137 DRM_ERROR("Failed to read DPCD: %d\n", err); 138 return err; 139 } 140 141 /* Clear channel x SERDES power down */ 142 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 143 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD); 144 if (err) 145 return err; 146 147 /* 148 * Power up the sink (DP_SET_POWER register is only available on DPCD 149 * v1.1 and later). 150 */ 151 if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) { 152 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]); 153 if (err < 0) { 154 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n", 155 err); 156 return err; 157 } 158 159 dpcd[0] &= ~DP_SET_POWER_MASK; 160 dpcd[0] |= DP_SET_POWER_D0; 161 162 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]); 163 if (err < 0) { 164 DRM_ERROR("Failed to power up DisplayPort link: %d\n", 165 err); 166 return err; 167 } 168 169 /* 170 * According to the DP 1.1 specification, a "Sink Device must 171 * exit the power saving state within 1 ms" (Section 2.5.3.1, 172 * Table 5-52, "Sink Control Field" (register 0x600). 173 */ 174 usleep_range(1000, 2000); 175 } 176 177 /* Possibly enable downspread on the sink */ 178 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 179 SP_DP_DOWNSPREAD_CTRL1_REG, 0); 180 if (err) 181 return err; 182 183 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) { 184 DRM_DEBUG("Enable downspread on the sink\n"); 185 /* 4000PPM */ 186 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 187 SP_DP_DOWNSPREAD_CTRL1_REG, 8); 188 if (err) 189 return err; 190 191 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 192 DP_SPREAD_AMP_0_5); 193 if (err < 0) 194 return err; 195 } else { 196 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0); 197 if (err < 0) 198 return err; 199 } 200 201 /* Set the lane count and the link rate on the sink */ 202 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 203 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 204 SP_DP_SYSTEM_CTRL_BASE + 4, 205 SP_ENHANCED_MODE); 206 else 207 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 208 SP_DP_SYSTEM_CTRL_BASE + 4, 209 SP_ENHANCED_MODE); 210 if (err) 211 return err; 212 213 dpcd[0] = dp_bw; 214 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 215 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]); 216 if (err) 217 return err; 218 219 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd); 220 221 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 222 SP_DP_LANE_COUNT_SET_REG, dpcd[1]); 223 if (err) 224 return err; 225 226 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 227 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 228 229 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd, 230 sizeof(dpcd)); 231 232 if (err < 0) { 233 DRM_ERROR("Failed to configure link: %d\n", err); 234 return err; 235 } 236 237 /* Start training on the source */ 238 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, 239 SP_LT_EN); 240 if (err) 241 return err; 242 243 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], 244 SP_DP_LT_CTRL_REG, 245 value, !(value & SP_DP_LT_INPROGRESS), 246 POLL_DELAY, POLL_TIMEOUT); 247 } 248 249 static int anx6345_tx_initialization(struct anx6345 *anx6345) 250 { 251 int err, i; 252 253 /* FIXME: colordepth is hardcoded for now */ 254 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, 255 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); 256 if (err) 257 return err; 258 259 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); 260 if (err) 261 return err; 262 263 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], 264 SP_ANALOG_DEBUG1_REG, 0); 265 if (err) 266 return err; 267 268 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 269 SP_DP_LINK_DEBUG_CTRL_REG, 270 SP_NEW_PRBS7 | SP_M_VID_DEBUG); 271 if (err) 272 return err; 273 274 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 275 SP_DP_ANALOG_POWER_DOWN_REG, 0); 276 if (err) 277 return err; 278 279 /* Force HPD */ 280 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 281 SP_DP_SYSTEM_CTRL_BASE + 3, 282 SP_HPD_FORCE | SP_HPD_CTRL); 283 if (err) 284 return err; 285 286 for (i = 0; i < 4; i++) { 287 /* 4 lanes */ 288 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 289 SP_DP_LANE0_LT_CTRL_REG + i, 0); 290 if (err) 291 return err; 292 } 293 294 /* Reset AUX */ 295 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], 296 SP_RESET_CTRL2_REG, SP_AUX_RST); 297 if (err) 298 return err; 299 300 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 301 SP_RESET_CTRL2_REG, SP_AUX_RST); 302 } 303 304 static void anx6345_poweron(struct anx6345 *anx6345) 305 { 306 int err; 307 308 /* Ensure reset is asserted before starting power on sequence */ 309 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 310 usleep_range(1000, 2000); 311 312 err = regulator_enable(anx6345->dvdd12); 313 if (err) { 314 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", 315 err); 316 return; 317 } 318 319 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ 320 usleep_range(1000, 2000); 321 322 err = regulator_enable(anx6345->dvdd25); 323 if (err) { 324 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", 325 err); 326 return; 327 } 328 329 /* T2 - delay between RESETN and all power rail stable, 330 * should be 2-5ms 331 */ 332 usleep_range(2000, 5000); 333 334 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); 335 336 /* Power on registers module */ 337 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 338 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 339 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 340 SP_REGISTER_PD | SP_TOTAL_PD); 341 342 if (anx6345->panel) 343 drm_panel_prepare(anx6345->panel); 344 345 anx6345->powered = true; 346 } 347 348 static void anx6345_poweroff(struct anx6345 *anx6345) 349 { 350 int err; 351 352 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 353 usleep_range(1000, 2000); 354 355 if (anx6345->panel) 356 drm_panel_unprepare(anx6345->panel); 357 358 err = regulator_disable(anx6345->dvdd25); 359 if (err) { 360 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", 361 err); 362 return; 363 } 364 365 usleep_range(5000, 10000); 366 367 err = regulator_disable(anx6345->dvdd12); 368 if (err) { 369 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", 370 err); 371 return; 372 } 373 374 usleep_range(1000, 2000); 375 376 anx6345->powered = false; 377 } 378 379 static int anx6345_start(struct anx6345 *anx6345) 380 { 381 int err; 382 383 if (!anx6345->powered) 384 anx6345_poweron(anx6345); 385 386 /* Power on needed modules */ 387 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 388 SP_POWERDOWN_CTRL_REG, 389 SP_VIDEO_PD | SP_LINK_PD); 390 391 err = anx6345_tx_initialization(anx6345); 392 if (err) { 393 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); 394 anx6345_poweroff(anx6345); 395 return err; 396 } 397 398 err = anx6345_dp_link_training(anx6345); 399 if (err) { 400 DRM_ERROR("Failed link training: %d\n", err); 401 anx6345_poweroff(anx6345); 402 return err; 403 } 404 405 /* 406 * This delay seems to help keep the hardware in a good state. Without 407 * it, there are times where it fails silently. 408 */ 409 usleep_range(10000, 15000); 410 411 return 0; 412 } 413 414 static int anx6345_config_dp_output(struct anx6345 *anx6345) 415 { 416 int err; 417 418 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 419 SP_VIDEO_MUTE); 420 if (err) 421 return err; 422 423 /* Enable DP output */ 424 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 425 SP_VIDEO_EN); 426 if (err) 427 return err; 428 429 /* Force stream valid */ 430 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 431 SP_DP_SYSTEM_CTRL_BASE + 3, 432 SP_STRM_FORCE | SP_STRM_CTRL); 433 } 434 435 static int anx6345_get_downstream_info(struct anx6345 *anx6345) 436 { 437 u8 value; 438 int err; 439 440 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); 441 if (err < 0) { 442 DRM_ERROR("Get sink count failed %d\n", err); 443 return err; 444 } 445 446 if (!DP_GET_SINK_COUNT(value)) { 447 DRM_ERROR("Downstream disconnected\n"); 448 return -EIO; 449 } 450 451 return 0; 452 } 453 454 static int anx6345_get_modes(struct drm_connector *connector) 455 { 456 struct anx6345 *anx6345 = connector_to_anx6345(connector); 457 int err, num_modes = 0; 458 bool power_off = false; 459 460 mutex_lock(&anx6345->lock); 461 462 if (!anx6345->edid) { 463 if (!anx6345->powered) { 464 anx6345_poweron(anx6345); 465 power_off = true; 466 } 467 468 err = anx6345_get_downstream_info(anx6345); 469 if (err) { 470 DRM_ERROR("Failed to get downstream info: %d\n", err); 471 goto unlock; 472 } 473 474 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); 475 if (!anx6345->edid) 476 DRM_ERROR("Failed to read EDID from panel\n"); 477 478 err = drm_connector_update_edid_property(connector, 479 anx6345->edid); 480 if (err) { 481 DRM_ERROR("Failed to update EDID property: %d\n", err); 482 goto unlock; 483 } 484 } 485 486 num_modes += drm_add_edid_modes(connector, anx6345->edid); 487 488 unlock: 489 if (power_off) 490 anx6345_poweroff(anx6345); 491 492 mutex_unlock(&anx6345->lock); 493 494 if (!num_modes && anx6345->panel) 495 num_modes += drm_panel_get_modes(anx6345->panel, connector); 496 497 return num_modes; 498 } 499 500 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { 501 .get_modes = anx6345_get_modes, 502 }; 503 504 static void 505 anx6345_connector_destroy(struct drm_connector *connector) 506 { 507 struct anx6345 *anx6345 = connector_to_anx6345(connector); 508 509 if (anx6345->panel) 510 drm_panel_detach(anx6345->panel); 511 drm_connector_cleanup(connector); 512 } 513 514 static const struct drm_connector_funcs anx6345_connector_funcs = { 515 .fill_modes = drm_helper_probe_single_connector_modes, 516 .destroy = anx6345_connector_destroy, 517 .reset = drm_atomic_helper_connector_reset, 518 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 519 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 520 }; 521 522 static int anx6345_bridge_attach(struct drm_bridge *bridge, 523 enum drm_bridge_attach_flags flags) 524 { 525 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 526 int err; 527 528 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { 529 DRM_ERROR("Fix bridge driver to make connector optional!"); 530 return -EINVAL; 531 } 532 533 if (!bridge->encoder) { 534 DRM_ERROR("Parent encoder object not found"); 535 return -ENODEV; 536 } 537 538 /* Register aux channel */ 539 anx6345->aux.name = "DP-AUX"; 540 anx6345->aux.dev = &anx6345->client->dev; 541 anx6345->aux.transfer = anx6345_aux_transfer; 542 543 err = drm_dp_aux_register(&anx6345->aux); 544 if (err < 0) { 545 DRM_ERROR("Failed to register aux channel: %d\n", err); 546 return err; 547 } 548 549 err = drm_connector_init(bridge->dev, &anx6345->connector, 550 &anx6345_connector_funcs, 551 DRM_MODE_CONNECTOR_eDP); 552 if (err) { 553 DRM_ERROR("Failed to initialize connector: %d\n", err); 554 return err; 555 } 556 557 drm_connector_helper_add(&anx6345->connector, 558 &anx6345_connector_helper_funcs); 559 560 err = drm_connector_register(&anx6345->connector); 561 if (err) { 562 DRM_ERROR("Failed to register connector: %d\n", err); 563 return err; 564 } 565 566 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; 567 568 err = drm_connector_attach_encoder(&anx6345->connector, 569 bridge->encoder); 570 if (err) { 571 DRM_ERROR("Failed to link up connector to encoder: %d\n", err); 572 return err; 573 } 574 575 if (anx6345->panel) { 576 err = drm_panel_attach(anx6345->panel, &anx6345->connector); 577 if (err) { 578 DRM_ERROR("Failed to attach panel: %d\n", err); 579 return err; 580 } 581 } 582 583 return 0; 584 } 585 586 static enum drm_mode_status 587 anx6345_bridge_mode_valid(struct drm_bridge *bridge, 588 const struct drm_display_info *info, 589 const struct drm_display_mode *mode) 590 { 591 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 592 return MODE_NO_INTERLACE; 593 594 /* Max 1200p at 5.4 Ghz, one lane */ 595 if (mode->clock > 154000) 596 return MODE_CLOCK_HIGH; 597 598 return MODE_OK; 599 } 600 601 static void anx6345_bridge_disable(struct drm_bridge *bridge) 602 { 603 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 604 605 /* Power off all modules except configuration registers access */ 606 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 607 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 608 if (anx6345->panel) 609 drm_panel_disable(anx6345->panel); 610 611 if (anx6345->powered) 612 anx6345_poweroff(anx6345); 613 } 614 615 static void anx6345_bridge_enable(struct drm_bridge *bridge) 616 { 617 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 618 int err; 619 620 if (anx6345->panel) 621 drm_panel_enable(anx6345->panel); 622 623 err = anx6345_start(anx6345); 624 if (err) { 625 DRM_ERROR("Failed to initialize: %d\n", err); 626 return; 627 } 628 629 err = anx6345_config_dp_output(anx6345); 630 if (err) 631 DRM_ERROR("Failed to enable DP output: %d\n", err); 632 } 633 634 static const struct drm_bridge_funcs anx6345_bridge_funcs = { 635 .attach = anx6345_bridge_attach, 636 .mode_valid = anx6345_bridge_mode_valid, 637 .disable = anx6345_bridge_disable, 638 .enable = anx6345_bridge_enable, 639 }; 640 641 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) 642 { 643 unsigned int i; 644 645 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) 646 if (anx6345->i2c_clients[i] && 647 anx6345->i2c_clients[i]->addr != anx6345->client->addr) 648 i2c_unregister_device(anx6345->i2c_clients[i]); 649 } 650 651 static const struct regmap_config anx6345_regmap_config = { 652 .reg_bits = 8, 653 .val_bits = 8, 654 .max_register = 0xff, 655 .cache_type = REGCACHE_NONE, 656 }; 657 658 static const u16 anx6345_chipid_list[] = { 659 0x6345, 660 }; 661 662 static bool anx6345_get_chip_id(struct anx6345 *anx6345) 663 { 664 unsigned int i, idl, idh, version; 665 666 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) 667 return false; 668 669 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) 670 return false; 671 672 anx6345->chipid = (u8)idl | ((u8)idh << 8); 673 674 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, 675 &version)) 676 return false; 677 678 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { 679 if (anx6345->chipid == anx6345_chipid_list[i]) { 680 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", 681 anx6345->chipid, version); 682 return true; 683 } 684 } 685 686 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", 687 anx6345->chipid, version); 688 689 return false; 690 } 691 692 static int anx6345_i2c_probe(struct i2c_client *client, 693 const struct i2c_device_id *id) 694 { 695 struct anx6345 *anx6345; 696 struct device *dev; 697 int i, err; 698 699 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); 700 if (!anx6345) 701 return -ENOMEM; 702 703 mutex_init(&anx6345->lock); 704 705 anx6345->bridge.of_node = client->dev.of_node; 706 707 anx6345->client = client; 708 i2c_set_clientdata(client, anx6345); 709 710 dev = &anx6345->client->dev; 711 712 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, 713 &anx6345->panel, NULL); 714 if (err == -EPROBE_DEFER) 715 return err; 716 717 if (err) 718 DRM_DEBUG("No panel found\n"); 719 720 /* 1.2V digital core power regulator */ 721 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12"); 722 if (IS_ERR(anx6345->dvdd12)) { 723 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER) 724 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n", 725 PTR_ERR(anx6345->dvdd12)); 726 return PTR_ERR(anx6345->dvdd12); 727 } 728 729 /* 2.5V digital core power regulator */ 730 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25"); 731 if (IS_ERR(anx6345->dvdd25)) { 732 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER) 733 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n", 734 PTR_ERR(anx6345->dvdd25)); 735 return PTR_ERR(anx6345->dvdd25); 736 } 737 738 /* GPIO for chip reset */ 739 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 740 if (IS_ERR(anx6345->gpiod_reset)) { 741 DRM_ERROR("Reset gpio not found\n"); 742 return PTR_ERR(anx6345->gpiod_reset); 743 } 744 745 /* Map slave addresses of ANX6345 */ 746 for (i = 0; i < I2C_NUM_ADDRESSES; i++) { 747 if (anx6345_i2c_addresses[i] >> 1 != client->addr) 748 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter, 749 anx6345_i2c_addresses[i] >> 1); 750 else 751 anx6345->i2c_clients[i] = client; 752 753 if (IS_ERR(anx6345->i2c_clients[i])) { 754 err = PTR_ERR(anx6345->i2c_clients[i]); 755 DRM_ERROR("Failed to reserve I2C bus %02x\n", 756 anx6345_i2c_addresses[i]); 757 goto err_unregister_i2c; 758 } 759 760 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], 761 &anx6345_regmap_config); 762 if (IS_ERR(anx6345->map[i])) { 763 err = PTR_ERR(anx6345->map[i]); 764 DRM_ERROR("Failed regmap initialization %02x\n", 765 anx6345_i2c_addresses[i]); 766 goto err_unregister_i2c; 767 } 768 } 769 770 /* Look for supported chip ID */ 771 anx6345_poweron(anx6345); 772 if (anx6345_get_chip_id(anx6345)) { 773 anx6345->bridge.funcs = &anx6345_bridge_funcs; 774 drm_bridge_add(&anx6345->bridge); 775 776 return 0; 777 } else { 778 anx6345_poweroff(anx6345); 779 err = -ENODEV; 780 } 781 782 err_unregister_i2c: 783 unregister_i2c_dummy_clients(anx6345); 784 return err; 785 } 786 787 static int anx6345_i2c_remove(struct i2c_client *client) 788 { 789 struct anx6345 *anx6345 = i2c_get_clientdata(client); 790 791 drm_bridge_remove(&anx6345->bridge); 792 793 unregister_i2c_dummy_clients(anx6345); 794 795 kfree(anx6345->edid); 796 797 mutex_destroy(&anx6345->lock); 798 799 return 0; 800 } 801 802 static const struct i2c_device_id anx6345_id[] = { 803 { "anx6345", 0 }, 804 { /* sentinel */ } 805 }; 806 MODULE_DEVICE_TABLE(i2c, anx6345_id); 807 808 static const struct of_device_id anx6345_match_table[] = { 809 { .compatible = "analogix,anx6345", }, 810 { /* sentinel */ }, 811 }; 812 MODULE_DEVICE_TABLE(of, anx6345_match_table); 813 814 static struct i2c_driver anx6345_driver = { 815 .driver = { 816 .name = "anx6345", 817 .of_match_table = of_match_ptr(anx6345_match_table), 818 }, 819 .probe = anx6345_i2c_probe, 820 .remove = anx6345_i2c_remove, 821 .id_table = anx6345_id, 822 }; 823 module_i2c_driver(anx6345_driver); 824 825 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); 826 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); 827 MODULE_LICENSE("GPL v2"); 828