linux/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
<<
>>
Prefs
   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
  41static 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
  47struct 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
  69static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
  70{
  71        return container_of(c, struct anx6345, connector);
  72}
  73
  74static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
  75{
  76        return container_of(bridge, struct anx6345, bridge);
  77}
  78
  79static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
  80{
  81        return regmap_update_bits(map, reg, mask, mask);
  82}
  83
  84static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
  85{
  86        return regmap_update_bits(map, reg, mask, 0);
  87}
  88
  89static 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
  97static 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
 249static 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
 304static 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
 348static 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
 379static 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
 414static 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
 435static 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
 454static 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        /* Driver currently supports only 6bpc */
 489        connector->display_info.bpc = 6;
 490
 491unlock:
 492        if (power_off)
 493                anx6345_poweroff(anx6345);
 494
 495        mutex_unlock(&anx6345->lock);
 496
 497        if (!num_modes && anx6345->panel)
 498                num_modes += drm_panel_get_modes(anx6345->panel, connector);
 499
 500        return num_modes;
 501}
 502
 503static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = {
 504        .get_modes = anx6345_get_modes,
 505};
 506
 507static void
 508anx6345_connector_destroy(struct drm_connector *connector)
 509{
 510        struct anx6345 *anx6345 = connector_to_anx6345(connector);
 511
 512        if (anx6345->panel)
 513                drm_panel_detach(anx6345->panel);
 514        drm_connector_cleanup(connector);
 515}
 516
 517static const struct drm_connector_funcs anx6345_connector_funcs = {
 518        .fill_modes = drm_helper_probe_single_connector_modes,
 519        .destroy = anx6345_connector_destroy,
 520        .reset = drm_atomic_helper_connector_reset,
 521        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 522        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 523};
 524
 525static int anx6345_bridge_attach(struct drm_bridge *bridge,
 526                                 enum drm_bridge_attach_flags flags)
 527{
 528        struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
 529        int err;
 530
 531        if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
 532                DRM_ERROR("Fix bridge driver to make connector optional!");
 533                return -EINVAL;
 534        }
 535
 536        if (!bridge->encoder) {
 537                DRM_ERROR("Parent encoder object not found");
 538                return -ENODEV;
 539        }
 540
 541        /* Register aux channel */
 542        anx6345->aux.name = "DP-AUX";
 543        anx6345->aux.dev = &anx6345->client->dev;
 544        anx6345->aux.transfer = anx6345_aux_transfer;
 545
 546        err = drm_dp_aux_register(&anx6345->aux);
 547        if (err < 0) {
 548                DRM_ERROR("Failed to register aux channel: %d\n", err);
 549                return err;
 550        }
 551
 552        err = drm_connector_init(bridge->dev, &anx6345->connector,
 553                                 &anx6345_connector_funcs,
 554                                 DRM_MODE_CONNECTOR_eDP);
 555        if (err) {
 556                DRM_ERROR("Failed to initialize connector: %d\n", err);
 557                return err;
 558        }
 559
 560        drm_connector_helper_add(&anx6345->connector,
 561                                 &anx6345_connector_helper_funcs);
 562
 563        err = drm_connector_register(&anx6345->connector);
 564        if (err) {
 565                DRM_ERROR("Failed to register connector: %d\n", err);
 566                return err;
 567        }
 568
 569        anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
 570
 571        err = drm_connector_attach_encoder(&anx6345->connector,
 572                                           bridge->encoder);
 573        if (err) {
 574                DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
 575                return err;
 576        }
 577
 578        if (anx6345->panel) {
 579                err = drm_panel_attach(anx6345->panel, &anx6345->connector);
 580                if (err) {
 581                        DRM_ERROR("Failed to attach panel: %d\n", err);
 582                        return err;
 583                }
 584        }
 585
 586        return 0;
 587}
 588
 589static enum drm_mode_status
 590anx6345_bridge_mode_valid(struct drm_bridge *bridge,
 591                          const struct drm_display_mode *mode)
 592{
 593        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 594                return MODE_NO_INTERLACE;
 595
 596        /* Max 1200p at 5.4 Ghz, one lane */
 597        if (mode->clock > 154000)
 598                return MODE_CLOCK_HIGH;
 599
 600        return MODE_OK;
 601}
 602
 603static void anx6345_bridge_disable(struct drm_bridge *bridge)
 604{
 605        struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
 606
 607        /* Power off all modules except configuration registers access */
 608        anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
 609                         SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
 610        if (anx6345->panel)
 611                drm_panel_disable(anx6345->panel);
 612
 613        if (anx6345->powered)
 614                anx6345_poweroff(anx6345);
 615}
 616
 617static void anx6345_bridge_enable(struct drm_bridge *bridge)
 618{
 619        struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
 620        int err;
 621
 622        if (anx6345->panel)
 623                drm_panel_enable(anx6345->panel);
 624
 625        err = anx6345_start(anx6345);
 626        if (err) {
 627                DRM_ERROR("Failed to initialize: %d\n", err);
 628                return;
 629        }
 630
 631        err = anx6345_config_dp_output(anx6345);
 632        if (err)
 633                DRM_ERROR("Failed to enable DP output: %d\n", err);
 634}
 635
 636static const struct drm_bridge_funcs anx6345_bridge_funcs = {
 637        .attach = anx6345_bridge_attach,
 638        .mode_valid = anx6345_bridge_mode_valid,
 639        .disable = anx6345_bridge_disable,
 640        .enable = anx6345_bridge_enable,
 641};
 642
 643static 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
 653static 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
 660static const u16 anx6345_chipid_list[] = {
 661        0x6345,
 662};
 663
 664static 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
 694static int anx6345_i2c_probe(struct i2c_client *client,
 695                             const struct i2c_device_id *id)
 696{
 697        struct anx6345 *anx6345;
 698        struct device *dev;
 699        int i, err;
 700
 701        anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
 702        if (!anx6345)
 703                return -ENOMEM;
 704
 705        mutex_init(&anx6345->lock);
 706
 707        anx6345->bridge.of_node = client->dev.of_node;
 708
 709        anx6345->client = client;
 710        i2c_set_clientdata(client, anx6345);
 711
 712        dev = &anx6345->client->dev;
 713
 714        err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
 715                                          &anx6345->panel, NULL);
 716        if (err == -EPROBE_DEFER)
 717                return err;
 718
 719        if (err)
 720                DRM_DEBUG("No panel found\n");
 721
 722        /* 1.2V digital core power regulator  */
 723        anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12");
 724        if (IS_ERR(anx6345->dvdd12)) {
 725                if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER)
 726                        DRM_ERROR("Failed to get dvdd12 supply (%ld)\n",
 727                                  PTR_ERR(anx6345->dvdd12));
 728                return PTR_ERR(anx6345->dvdd12);
 729        }
 730
 731        /* 2.5V digital core power regulator  */
 732        anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25");
 733        if (IS_ERR(anx6345->dvdd25)) {
 734                if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER)
 735                        DRM_ERROR("Failed to get dvdd25 supply (%ld)\n",
 736                                  PTR_ERR(anx6345->dvdd25));
 737                return PTR_ERR(anx6345->dvdd25);
 738        }
 739
 740        /* GPIO for chip reset */
 741        anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
 742        if (IS_ERR(anx6345->gpiod_reset)) {
 743                DRM_ERROR("Reset gpio not found\n");
 744                return PTR_ERR(anx6345->gpiod_reset);
 745        }
 746
 747        /* Map slave addresses of ANX6345 */
 748        for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
 749                if (anx6345_i2c_addresses[i] >> 1 != client->addr)
 750                        anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter,
 751                                                anx6345_i2c_addresses[i] >> 1);
 752                else
 753                        anx6345->i2c_clients[i] = client;
 754
 755                if (IS_ERR(anx6345->i2c_clients[i])) {
 756                        err = PTR_ERR(anx6345->i2c_clients[i]);
 757                        DRM_ERROR("Failed to reserve I2C bus %02x\n",
 758                                  anx6345_i2c_addresses[i]);
 759                        goto err_unregister_i2c;
 760                }
 761
 762                anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
 763                                                       &anx6345_regmap_config);
 764                if (IS_ERR(anx6345->map[i])) {
 765                        err = PTR_ERR(anx6345->map[i]);
 766                        DRM_ERROR("Failed regmap initialization %02x\n",
 767                                  anx6345_i2c_addresses[i]);
 768                        goto err_unregister_i2c;
 769                }
 770        }
 771
 772        /* Look for supported chip ID */
 773        anx6345_poweron(anx6345);
 774        if (anx6345_get_chip_id(anx6345)) {
 775                anx6345->bridge.funcs = &anx6345_bridge_funcs;
 776                drm_bridge_add(&anx6345->bridge);
 777
 778                return 0;
 779        } else {
 780                anx6345_poweroff(anx6345);
 781                err = -ENODEV;
 782        }
 783
 784err_unregister_i2c:
 785        unregister_i2c_dummy_clients(anx6345);
 786        return err;
 787}
 788
 789static int anx6345_i2c_remove(struct i2c_client *client)
 790{
 791        struct anx6345 *anx6345 = i2c_get_clientdata(client);
 792
 793        drm_bridge_remove(&anx6345->bridge);
 794
 795        unregister_i2c_dummy_clients(anx6345);
 796
 797        kfree(anx6345->edid);
 798
 799        mutex_destroy(&anx6345->lock);
 800
 801        return 0;
 802}
 803
 804static const struct i2c_device_id anx6345_id[] = {
 805        { "anx6345", 0 },
 806        { /* sentinel */ }
 807};
 808MODULE_DEVICE_TABLE(i2c, anx6345_id);
 809
 810static const struct of_device_id anx6345_match_table[] = {
 811        { .compatible = "analogix,anx6345", },
 812        { /* sentinel */ },
 813};
 814MODULE_DEVICE_TABLE(of, anx6345_match_table);
 815
 816static struct i2c_driver anx6345_driver = {
 817        .driver = {
 818                   .name = "anx6345",
 819                   .of_match_table = of_match_ptr(anx6345_match_table),
 820                  },
 821        .probe = anx6345_i2c_probe,
 822        .remove = anx6345_i2c_remove,
 823        .id_table = anx6345_id,
 824};
 825module_i2c_driver(anx6345_driver);
 826
 827MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
 828MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
 829MODULE_LICENSE("GPL v2");
 830