drivers/gpu/drm/i2c/adv7511.c

   1 /*
   2  * Analog Devices ADV7511 HDMI transmitter driver
   3  *
   4  * Copyright 2012 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2.
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/i2c.h>
  12 #include <linux/module.h>
  13 #include <linux/regmap.h>
  14 #include <linux/slab.h>
  15
  16 #include <drm/drmP.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_edid.h>
  19 #include <drm/drm_encoder_slave.h>
  20
  21 #include "adv7511.h"
  22
  23 struct adv7511 {
  24         struct i2c_client *i2c_main;
  25         struct i2c_client *i2c_edid;
  26
  27         struct regmap *regmap;
  28         struct regmap *packet_memory_regmap;
  29         enum drm_connector_status status;
  30         int dpms_mode;
  31
  32         unsigned int f_tmds;
  33
  34         unsigned int current_edid_segment;
  35         uint8_t edid_buf[256];
  36
  37         wait_queue_head_t wq;
  38         struct drm_encoder *encoder;
  39
  40         bool embedded_sync;
  41         enum adv7511_sync_polarity vsync_polarity;
  42         enum adv7511_sync_polarity hsync_polarity;
  43         bool rgb;
  44
  45         struct edid *edid;
  46
  47         struct gpio_desc *gpio_pd;
  48 };
  49
  50 static struct adv7511 *encoder_to_adv7511(struct drm_encoder *encoder)
  51 {
  52         return to_encoder_slave(encoder)->slave_priv;
  53 }
  54
  55 /* ADI recommended values for proper operation. */
  56 static const struct reg_default adv7511_fixed_registers[] = {
  57         { 0x98, 0x03 },
  58         { 0x9a, 0xe0 },
  59         { 0x9c, 0x30 },
  60         { 0x9d, 0x61 },
  61         { 0xa2, 0xa4 },
  62         { 0xa3, 0xa4 },
  63         { 0xe0, 0xd0 },
  64         { 0xf9, 0x00 },
  65         { 0x55, 0x02 },
  66 };
  67
  68 /* -----------------------------------------------------------------------------
  69  * Register access
  70  */
  71
  72 static const uint8_t adv7511_register_defaults[] = {
  73         0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00 */
  74         0x00, 0x00, 0x01, 0x0e, 0xbc, 0x18, 0x01, 0x13,
  75         0x25, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 10 */
  76         0x46, 0x62, 0x04, 0xa8, 0x00, 0x00, 0x1c, 0x84,
  77         0x1c, 0xbf, 0x04, 0xa8, 0x1e, 0x70, 0x02, 0x1e, /* 20 */
  78         0x00, 0x00, 0x04, 0xa8, 0x08, 0x12, 0x1b, 0xac,
  79         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 30 */
  80         0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0xb0,
  81         0x00, 0x50, 0x90, 0x7e, 0x79, 0x70, 0x00, 0x00, /* 40 */
  82         0x00, 0xa8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  83         0x00, 0x00, 0x02, 0x0d, 0x00, 0x00, 0x00, 0x00, /* 50 */
  84         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  85         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 60 */
  86         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  87         0x01, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 70 */
  88         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  89         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 80 */
  90         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  91         0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, /* 90 */
  92         0x0b, 0x02, 0x00, 0x18, 0x5a, 0x60, 0x00, 0x00,
  93         0x00, 0x00, 0x80, 0x80, 0x08, 0x04, 0x00, 0x00, /* a0 */
  94         0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x40, 0x14,
  95         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* b0 */
  96         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  97         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* c0 */
  98         0x00, 0x03, 0x00, 0x00, 0x02, 0x00, 0x01, 0x04,
  99         0x30, 0xff, 0x80, 0x80, 0x80, 0x00, 0x00, 0x00, /* d0 */
 100         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01,
 101         0x80, 0x75, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, /* e0 */
 102         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 103         0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x11, 0x00, /* f0 */
 104         0x00, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 105 };
 106
 107 static bool adv7511_register_volatile(struct device *dev, unsigned int reg)
 108 {
 109         switch (reg) {
 110         case ADV7511_REG_CHIP_REVISION:
 111         case ADV7511_REG_SPDIF_FREQ:
 112         case ADV7511_REG_CTS_AUTOMATIC1:
 113         case ADV7511_REG_CTS_AUTOMATIC2:
 114         case ADV7511_REG_VIC_DETECTED:
 115         case ADV7511_REG_VIC_SEND:
 116         case ADV7511_REG_AUX_VIC_DETECTED:
 117         case ADV7511_REG_STATUS:
 118         case ADV7511_REG_GC(1):
 119         case ADV7511_REG_INT(0):
 120         case ADV7511_REG_INT(1):
 121         case ADV7511_REG_PLL_STATUS:
 122         case ADV7511_REG_AN(0):
 123         case ADV7511_REG_AN(1):
 124         case ADV7511_REG_AN(2):
 125         case ADV7511_REG_AN(3):
 126         case ADV7511_REG_AN(4):
 127         case ADV7511_REG_AN(5):
 128         case ADV7511_REG_AN(6):
 129         case ADV7511_REG_AN(7):
 130         case ADV7511_REG_HDCP_STATUS:
 131         case ADV7511_REG_BCAPS:
 132         case ADV7511_REG_BKSV(0):
 133         case ADV7511_REG_BKSV(1):
 134         case ADV7511_REG_BKSV(2):
 135         case ADV7511_REG_BKSV(3):
 136         case ADV7511_REG_BKSV(4):
 137         case ADV7511_REG_DDC_STATUS:
 138         case ADV7511_REG_BSTATUS(0):
 139         case ADV7511_REG_BSTATUS(1):
 140         case ADV7511_REG_CHIP_ID_HIGH:
 141         case ADV7511_REG_CHIP_ID_LOW:
 142                 return true;
 143         }
 144
 145         return false;
 146 }
 147
 148 static const struct regmap_config adv7511_regmap_config = {
 149         .reg_bits = 8,
 150         .val_bits = 8,
 151
 152         .max_register = 0xff,
 153         .cache_type = REGCACHE_RBTREE,
 154         .reg_defaults_raw = adv7511_register_defaults,
 155         .num_reg_defaults_raw = ARRAY_SIZE(adv7511_register_defaults),
 156
 157         .volatile_reg = adv7511_register_volatile,
 158 };
 159
 160 /* -----------------------------------------------------------------------------
 161  * Hardware configuration
 162  */
 163
 164 static void adv7511_set_colormap(struct adv7511 *adv7511, bool enable,
 165                                  const uint16_t *coeff,
 166                                  unsigned int scaling_factor)
 167 {
 168         unsigned int i;
 169
 170         regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
 171                            ADV7511_CSC_UPDATE_MODE, ADV7511_CSC_UPDATE_MODE);
 172
 173         if (enable) {
 174                 for (i = 0; i < 12; ++i) {
 175                         regmap_update_bits(adv7511->regmap,
 176                                            ADV7511_REG_CSC_UPPER(i),
 177                                            0x1f, coeff[i] >> 8);
 178                         regmap_write(adv7511->regmap,
 179                                      ADV7511_REG_CSC_LOWER(i),
 180                                      coeff[i] & 0xff);
 181                 }
 182         }
 183
 184         if (enable)
 185                 regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
 186                                    0xe0, 0x80 | (scaling_factor << 5));
 187         else
 188                 regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
 189                                    0x80, 0x00);
 190
 191         regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
 192                            ADV7511_CSC_UPDATE_MODE, 0);
 193 }
 194
 195 static int adv7511_packet_enable(struct adv7511 *adv7511, unsigned int packet)
 196 {
 197         if (packet & 0xff)
 198                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
 199                                    packet, 0xff);
 200
 201         if (packet & 0xff00) {
 202                 packet >>= 8;
 203                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 204                                    packet, 0xff);
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int adv7511_packet_disable(struct adv7511 *adv7511, unsigned int packet)
 211 {
 212         if (packet & 0xff)
 213                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
 214                                    packet, 0x00);
 215
 216         if (packet & 0xff00) {
 217                 packet >>= 8;
 218                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 219                                    packet, 0x00);
 220         }
 221
 222         return 0;
 223 }
 224
 225 /* Coefficients for adv7511 color space conversion */
 226 static const uint16_t adv7511_csc_ycbcr_to_rgb[] = {
 227         0x0734, 0x04ad, 0x0000, 0x1c1b,
 228         0x1ddc, 0x04ad, 0x1f24, 0x0135,
 229         0x0000, 0x04ad, 0x087c, 0x1b77,
 230 };
 231
 232 static void adv7511_set_config_csc(struct adv7511 *adv7511,
 233                                    struct drm_connector *connector,
 234                                    bool rgb)
 235 {
 236         struct adv7511_video_config config;
 237         bool output_format_422, output_format_ycbcr;
 238         unsigned int mode;
 239         uint8_t infoframe[17];
 240
 241         if (adv7511->edid)
 242                 config.hdmi_mode = drm_detect_hdmi_monitor(adv7511->edid);
 243         else
 244                 config.hdmi_mode = false;
 245
 246         hdmi_avi_infoframe_init(&config.avi_infoframe);
 247
 248         config.avi_infoframe.scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
 249
 250         if (rgb) {
 251                 config.csc_enable = false;
 252                 config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
 253         } else {
 254                 config.csc_scaling_factor = ADV7511_CSC_SCALING_4;
 255                 config.csc_coefficents = adv7511_csc_ycbcr_to_rgb;
 256
 257                 if ((connector->display_info.color_formats &
 258                      DRM_COLOR_FORMAT_YCRCB422) &&
 259                     config.hdmi_mode) {
 260                         config.csc_enable = false;
 261                         config.avi_infoframe.colorspace =
 262                                 HDMI_COLORSPACE_YUV422;
 263                 } else {
 264                         config.csc_enable = true;
 265                         config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
 266                 }
 267         }
 268
 269         if (config.hdmi_mode) {
 270                 mode = ADV7511_HDMI_CFG_MODE_HDMI;
 271
 272                 switch (config.avi_infoframe.colorspace) {
 273                 case HDMI_COLORSPACE_YUV444:
 274                         output_format_422 = false;
 275                         output_format_ycbcr = true;
 276                         break;
 277                 case HDMI_COLORSPACE_YUV422:
 278                         output_format_422 = true;
 279                         output_format_ycbcr = true;
 280                         break;
 281                 default:
 282                         output_format_422 = false;
 283                         output_format_ycbcr = false;
 284                         break;
 285                 }
 286         } else {
 287                 mode = ADV7511_HDMI_CFG_MODE_DVI;
 288                 output_format_422 = false;
 289                 output_format_ycbcr = false;
 290         }
 291
 292         adv7511_packet_disable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
 293
 294         adv7511_set_colormap(adv7511, config.csc_enable,
 295                              config.csc_coefficents,
 296                              config.csc_scaling_factor);
 297
 298         regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x81,
 299                            (output_format_422 << 7) | output_format_ycbcr);
 300
 301         regmap_update_bits(adv7511->regmap, ADV7511_REG_HDCP_HDMI_CFG,
 302                            ADV7511_HDMI_CFG_MODE_MASK, mode);
 303
 304         hdmi_avi_infoframe_pack(&config.avi_infoframe, infoframe,
 305                                 sizeof(infoframe));
 306
 307         /* The AVI infoframe id is not configurable */
 308         regmap_bulk_write(adv7511->regmap, ADV7511_REG_AVI_INFOFRAME_VERSION,
 309                           infoframe + 1, sizeof(infoframe) - 1);
 310
 311         adv7511_packet_enable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
 312 }
 313
 314 static void adv7511_set_link_config(struct adv7511 *adv7511,
 315                                     const struct adv7511_link_config *config)
 316 {
 317         /*
 318          * The input style values documented in the datasheet don't match the
 319          * hardware register field values :-(
 320          */
 321         static const unsigned int input_styles[4] = { 0, 2, 1, 3 };
 322
 323         unsigned int clock_delay;
 324         unsigned int color_depth;
 325         unsigned int input_id;
 326
 327         clock_delay = (config->clock_delay + 1200) / 400;
 328         color_depth = config->input_color_depth == 8 ? 3
 329                     : (config->input_color_depth == 10 ? 1 : 2);
 330
 331         /* TODO Support input ID 6 */
 332         if (config->input_colorspace != HDMI_COLORSPACE_YUV422)
 333                 input_id = config->input_clock == ADV7511_INPUT_CLOCK_DDR
 334                          ? 5 : 0;
 335         else if (config->input_clock == ADV7511_INPUT_CLOCK_DDR)
 336                 input_id = config->embedded_sync ? 8 : 7;
 337         else if (config->input_clock == ADV7511_INPUT_CLOCK_2X)
 338                 input_id = config->embedded_sync ? 4 : 3;
 339         else
 340                 input_id = config->embedded_sync ? 2 : 1;
 341
 342         regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG, 0xf,
 343                            input_id);
 344         regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x7e,
 345                            (color_depth << 4) |
 346                            (input_styles[config->input_style] << 2));
 347         regmap_write(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG2,
 348                      config->input_justification << 3);
 349         regmap_write(adv7511->regmap, ADV7511_REG_TIMING_GEN_SEQ,
 350                      config->sync_pulse << 2);
 351
 352         regmap_write(adv7511->regmap, 0xba, clock_delay << 5);
 353
 354         adv7511->embedded_sync = config->embedded_sync;
 355         adv7511->hsync_polarity = config->hsync_polarity;
 356         adv7511->vsync_polarity = config->vsync_polarity;
 357         adv7511->rgb = config->input_colorspace == HDMI_COLORSPACE_RGB;
 358 }
 359
 360 /* -----------------------------------------------------------------------------
 361  * Interrupt and hotplug detection
 362  */
 363
 364 static bool adv7511_hpd(struct adv7511 *adv7511)
 365 {
 366         unsigned int irq0;
 367         int ret;
 368
 369         ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
 370         if (ret < 0)
 371                 return false;
 372
 373         if (irq0 & ADV7511_INT0_HDP) {
 374                 regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
 375                              ADV7511_INT0_HDP);
 376                 return true;
 377         }
 378
 379         return false;
 380 }
 381
 382 static irqreturn_t adv7511_irq_handler(int irq, void *devid)
 383 {
 384         struct adv7511 *adv7511 = devid;
 385
 386         if (adv7511_hpd(adv7511))
 387                 drm_helper_hpd_irq_event(adv7511->encoder->dev);
 388
 389         wake_up_all(&adv7511->wq);
 390
 391         return IRQ_HANDLED;
 392 }
 393
 394 static unsigned int adv7511_is_interrupt_pending(struct adv7511 *adv7511,
 395                                                  unsigned int irq)
 396 {
 397         unsigned int irq0, irq1;
 398         unsigned int pending;
 399         int ret;
 400
 401         ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
 402         if (ret < 0)
 403                 return 0;
 404         ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(1), &irq1);
 405         if (ret < 0)
 406                 return 0;
 407
 408         pending = (irq1 << 8) | irq0;
 409
 410         return pending & irq;
 411 }
 412
 413 static int adv7511_wait_for_interrupt(struct adv7511 *adv7511, int irq,
 414                                       int timeout)
 415 {
 416         unsigned int pending;
 417         int ret;
 418
 419         if (adv7511->i2c_main->irq) {
 420                 ret = wait_event_interruptible_timeout(adv7511->wq,
 421                                 adv7511_is_interrupt_pending(adv7511, irq),
 422                                 msecs_to_jiffies(timeout));
 423                 if (ret <= 0)
 424                         return 0;
 425                 pending = adv7511_is_interrupt_pending(adv7511, irq);
 426         } else {
 427                 if (timeout < 25)
 428                         timeout = 25;
 429                 do {
 430                         pending = adv7511_is_interrupt_pending(adv7511, irq);
 431                         if (pending)
 432                                 break;
 433                         msleep(25);
 434                         timeout -= 25;
 435                 } while (timeout >= 25);
 436         }
 437
 438         return pending;
 439 }
 440
 441 /* -----------------------------------------------------------------------------
 442  * EDID retrieval
 443  */
 444
 445 static int adv7511_get_edid_block(void *data, u8 *buf, unsigned int block,
 446                                   size_t len)
 447 {
 448         struct adv7511 *adv7511 = data;
 449         struct i2c_msg xfer[2];
 450         uint8_t offset;
 451         unsigned int i;
 452         int ret;
 453
 454         if (len > 128)
 455                 return -EINVAL;
 456
 457         if (adv7511->current_edid_segment != block / 2) {
 458                 unsigned int status;
 459
 460                 ret = regmap_read(adv7511->regmap, ADV7511_REG_DDC_STATUS,
 461                                   &status);
 462                 if (ret < 0)
 463                         return ret;
 464
 465                 if (status != 2) {
 466                         regmap_write(adv7511->regmap, ADV7511_REG_EDID_SEGMENT,
 467                                      block);
 468                         ret = adv7511_wait_for_interrupt(adv7511,
 469                                         ADV7511_INT0_EDID_READY |
 470                                         ADV7511_INT1_DDC_ERROR, 200);
 471
 472                         if (!(ret & ADV7511_INT0_EDID_READY))
 473                                 return -EIO;
 474                 }
 475
 476                 regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
 477                              ADV7511_INT0_EDID_READY | ADV7511_INT1_DDC_ERROR);
 478
 479                 /* Break this apart, hopefully more I2C controllers will
 480                  * support 64 byte transfers than 256 byte transfers
 481                  */
 482
 483                 xfer[0].addr = adv7511->i2c_edid->addr;
 484                 xfer[0].flags = 0;
 485                 xfer[0].len = 1;
 486                 xfer[0].buf = &offset;
 487                 xfer[1].addr = adv7511->i2c_edid->addr;
 488                 xfer[1].flags = I2C_M_RD;
 489                 xfer[1].len = 64;
 490                 xfer[1].buf = adv7511->edid_buf;
 491
 492                 offset = 0;
 493
 494                 for (i = 0; i < 4; ++i) {
 495                         ret = i2c_transfer(adv7511->i2c_edid->adapter, xfer,
 496                                            ARRAY_SIZE(xfer));
 497                         if (ret < 0)
 498                                 return ret;
 499                         else if (ret != 2)
 500                                 return -EIO;
 501
 502                         xfer[1].buf += 64;
 503                         offset += 64;
 504                 }
 505
 506                 adv7511->current_edid_segment = block / 2;
 507         }
 508
 509         if (block % 2 == 0)
 510                 memcpy(buf, adv7511->edid_buf, len);
 511         else
 512                 memcpy(buf, adv7511->edid_buf + 128, len);
 513
 514         return 0;
 515 }
 516
 517 /* -----------------------------------------------------------------------------
 518  * Encoder operations
 519  */
 520
 521 static int adv7511_get_modes(struct drm_encoder *encoder,
 522                              struct drm_connector *connector)
 523 {
 524         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 525         struct edid *edid;
 526         unsigned int count;
 527
 528         /* Reading the EDID only works if the device is powered */
 529         if (adv7511->dpms_mode != DRM_MODE_DPMS_ON) {
 530                 regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
 531                              ADV7511_INT0_EDID_READY | ADV7511_INT1_DDC_ERROR);
 532                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 533                                    ADV7511_POWER_POWER_DOWN, 0);
 534                 adv7511->current_edid_segment = -1;
 535         }
 536
 537         edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);
 538
 539         if (adv7511->dpms_mode != DRM_MODE_DPMS_ON)
 540                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 541                                    ADV7511_POWER_POWER_DOWN,
 542                                    ADV7511_POWER_POWER_DOWN);
 543
 544         kfree(adv7511->edid);
 545         adv7511->edid = edid;
 546         if (!edid)
 547                 return 0;
 548
 549         drm_mode_connector_update_edid_property(connector, edid);
 550         count = drm_add_edid_modes(connector, edid);
 551
 552         adv7511_set_config_csc(adv7511, connector, adv7511->rgb);
 553
 554         return count;
 555 }
 556
 557 static void adv7511_encoder_dpms(struct drm_encoder *encoder, int mode)
 558 {
 559         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 560
 561         switch (mode) {
 562         case DRM_MODE_DPMS_ON:
 563                 adv7511->current_edid_segment = -1;
 564
 565                 regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
 566                              ADV7511_INT0_EDID_READY | ADV7511_INT1_DDC_ERROR);
 567                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 568                                    ADV7511_POWER_POWER_DOWN, 0);
 569                 /*
 570                  * Per spec it is allowed to pulse the HDP signal to indicate
 571                  * that the EDID information has changed. Some monitors do this
 572                  * when they wakeup from standby or are enabled. When the HDP
 573                  * goes low the adv7511 is reset and the outputs are disabled
 574                  * which might cause the monitor to go to standby again. To
 575                  * avoid this we ignore the HDP pin for the first few seconds
 576                  * after enabeling the output.
 577                  */
 578                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 579                                    ADV7511_REG_POWER2_HDP_SRC_MASK,
 580                                    ADV7511_REG_POWER2_HDP_SRC_NONE);
 581                 /* Most of the registers are reset during power down or
 582                  * when HPD is low
 583                  */
 584                 regcache_sync(adv7511->regmap);
 585                 break;
 586         default:
 587                 /* TODO: setup additional power down modes */
 588                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 589                                    ADV7511_POWER_POWER_DOWN,
 590                                    ADV7511_POWER_POWER_DOWN);
 591                 regcache_mark_dirty(adv7511->regmap);
 592                 break;
 593         }
 594
 595         adv7511->dpms_mode = mode;
 596 }
 597
 598 static enum drm_connector_status
 599 adv7511_encoder_detect(struct drm_encoder *encoder,
 600                        struct drm_connector *connector)
 601 {
 602         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 603         enum drm_connector_status status;
 604         unsigned int val;
 605         bool hpd;
 606         int ret;
 607
 608         ret = regmap_read(adv7511->regmap, ADV7511_REG_STATUS, &val);
 609         if (ret < 0)
 610                 return connector_status_disconnected;
 611
 612         if (val & ADV7511_STATUS_HPD)
 613                 status = connector_status_connected;
 614         else
 615                 status = connector_status_disconnected;
 616
 617         hpd = adv7511_hpd(adv7511);
 618
 619         /* The chip resets itself when the cable is disconnected, so in case
 620          * there is a pending HPD interrupt and the cable is connected there was
 621          * at least one transition from disconnected to connected and the chip
 622          * has to be reinitialized. */
 623         if (status == connector_status_connected && hpd &&
 624             adv7511->dpms_mode == DRM_MODE_DPMS_ON) {
 625                 regcache_mark_dirty(adv7511->regmap);
 626                 adv7511_encoder_dpms(encoder, adv7511->dpms_mode);
 627                 adv7511_get_modes(encoder, connector);
 628                 if (adv7511->status == connector_status_connected)
 629                         status = connector_status_disconnected;
 630         } else {
 631                 /* Renable HDP sensing */
 632                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 633                                    ADV7511_REG_POWER2_HDP_SRC_MASK,
 634                                    ADV7511_REG_POWER2_HDP_SRC_BOTH);
 635         }
 636
 637         adv7511->status = status;
 638         return status;
 639 }
 640
 641 static int adv7511_encoder_mode_valid(struct drm_encoder *encoder,
 642                                       struct drm_display_mode *mode)
 643 {
 644         if (mode->clock > 165000)
 645                 return MODE_CLOCK_HIGH;
 646
 647         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 648                 return MODE_NO_INTERLACE;
 649
 650         return MODE_OK;
 651 }
 652
 653 static void adv7511_encoder_mode_set(struct drm_encoder *encoder,
 654                                      struct drm_display_mode *mode,
 655                                      struct drm_display_mode *adj_mode)
 656 {
 657         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 658         unsigned int low_refresh_rate;
 659         unsigned int hsync_polarity = 0;
 660         unsigned int vsync_polarity = 0;
 661
 662         if (adv7511->embedded_sync) {
 663                 unsigned int hsync_offset, hsync_len;
 664                 unsigned int vsync_offset, vsync_len;
 665
 666                 hsync_offset = adj_mode->crtc_hsync_start -
 667                                adj_mode->crtc_hdisplay;
 668                 vsync_offset = adj_mode->crtc_vsync_start -
 669                                adj_mode->crtc_vdisplay;
 670                 hsync_len = adj_mode->crtc_hsync_end -
 671                             adj_mode->crtc_hsync_start;
 672                 vsync_len = adj_mode->crtc_vsync_end -
 673                             adj_mode->crtc_vsync_start;
 674
 675                 /* The hardware vsync generator has a off-by-one bug */
 676                 vsync_offset += 1;
 677
 678                 regmap_write(adv7511->regmap, ADV7511_REG_HSYNC_PLACEMENT_MSB,
 679                              ((hsync_offset >> 10) & 0x7) << 5);
 680                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(0),
 681                              (hsync_offset >> 2) & 0xff);
 682                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(1),
 683                              ((hsync_offset & 0x3) << 6) |
 684                              ((hsync_len >> 4) & 0x3f));
 685                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(2),
 686                              ((hsync_len & 0xf) << 4) |
 687                              ((vsync_offset >> 6) & 0xf));
 688                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(3),
 689                              ((vsync_offset & 0x3f) << 2) |
 690                              ((vsync_len >> 8) & 0x3));
 691                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(4),
 692                              vsync_len & 0xff);
 693
 694                 hsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PHSYNC);
 695                 vsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PVSYNC);
 696         } else {
 697                 enum adv7511_sync_polarity mode_hsync_polarity;
 698                 enum adv7511_sync_polarity mode_vsync_polarity;
 699
 700                 /**
 701                  * If the input signal is always low or always high we want to
 702                  * invert or let it passthrough depending on the polarity of the
 703                  * current mode.
 704                  **/
 705                 if (adj_mode->flags & DRM_MODE_FLAG_NHSYNC)
 706                         mode_hsync_polarity = ADV7511_SYNC_POLARITY_LOW;
 707                 else
 708                         mode_hsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
 709
 710                 if (adj_mode->flags & DRM_MODE_FLAG_NVSYNC)
 711                         mode_vsync_polarity = ADV7511_SYNC_POLARITY_LOW;
 712                 else
 713                         mode_vsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
 714
 715                 if (adv7511->hsync_polarity != mode_hsync_polarity &&
 716                     adv7511->hsync_polarity !=
 717                     ADV7511_SYNC_POLARITY_PASSTHROUGH)
 718                         hsync_polarity = 1;
 719
 720                 if (adv7511->vsync_polarity != mode_vsync_polarity &&
 721                     adv7511->vsync_polarity !=
 722                     ADV7511_SYNC_POLARITY_PASSTHROUGH)
 723                         vsync_polarity = 1;
 724         }
 725
 726         if (mode->vrefresh <= 24000)
 727                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_24HZ;
 728         else if (mode->vrefresh <= 25000)
 729                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_25HZ;
 730         else if (mode->vrefresh <= 30000)
 731                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_30HZ;
 732         else
 733                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
 734
 735         regmap_update_bits(adv7511->regmap, 0xfb,
 736                 0x6, low_refresh_rate << 1);
 737         regmap_update_bits(adv7511->regmap, 0x17,
 738                 0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
 739
 740         /*
 741          * TODO Test first order 4:2:2 to 4:4:4 up conversion method, which is
 742          * supposed to give better results.
 743          */
 744
 745         adv7511->f_tmds = mode->clock;
 746 }
 747
 748 static struct drm_encoder_slave_funcs adv7511_encoder_funcs = {
 749         .dpms = adv7511_encoder_dpms,
 750         .mode_valid = adv7511_encoder_mode_valid,
 751         .mode_set = adv7511_encoder_mode_set,
 752         .detect = adv7511_encoder_detect,
 753         .get_modes = adv7511_get_modes,
 754 };
 755
 756 /* -----------------------------------------------------------------------------
 757  * Probe & remove
 758  */
 759
 760 static int adv7511_parse_dt(struct device_node *np,
 761                             struct adv7511_link_config *config)
 762 {
 763         const char *str;
 764         int ret;
 765
 766         memset(config, 0, sizeof(*config));
 767
 768         of_property_read_u32(np, "adi,input-depth", &config->input_color_depth);
 769         if (config->input_color_depth != 8 && config->input_color_depth != 10 &&
 770             config->input_color_depth != 12)
 771                 return -EINVAL;
 772
 773         ret = of_property_read_string(np, "adi,input-colorspace", &str);
 774         if (ret < 0)
 775                 return ret;
 776
 777         if (!strcmp(str, "rgb"))
 778                 config->input_colorspace = HDMI_COLORSPACE_RGB;
 779         else if (!strcmp(str, "yuv422"))
 780                 config->input_colorspace = HDMI_COLORSPACE_YUV422;
 781         else if (!strcmp(str, "yuv444"))
 782                 config->input_colorspace = HDMI_COLORSPACE_YUV444;
 783         else
 784                 return -EINVAL;
 785
 786         ret = of_property_read_string(np, "adi,input-clock", &str);
 787         if (ret < 0)
 788                 return ret;
 789
 790         if (!strcmp(str, "1x"))
 791                 config->input_clock = ADV7511_INPUT_CLOCK_1X;
 792         else if (!strcmp(str, "2x"))
 793                 config->input_clock = ADV7511_INPUT_CLOCK_2X;
 794         else if (!strcmp(str, "ddr"))
 795                 config->input_clock = ADV7511_INPUT_CLOCK_DDR;
 796         else
 797                 return -EINVAL;
 798
 799         if (config->input_colorspace == HDMI_COLORSPACE_YUV422 ||
 800             config->input_clock != ADV7511_INPUT_CLOCK_1X) {
 801                 ret = of_property_read_u32(np, "adi,input-style",
 802                                            &config->input_style);
 803                 if (ret)
 804                         return ret;
 805
 806                 if (config->input_style < 1 || config->input_style > 3)
 807                         return -EINVAL;
 808
 809                 ret = of_property_read_string(np, "adi,input-justification",
 810                                               &str);
 811                 if (ret < 0)
 812                         return ret;
 813
 814                 if (!strcmp(str, "left"))
 815                         config->input_justification =
 816                                 ADV7511_INPUT_JUSTIFICATION_LEFT;
 817                 else if (!strcmp(str, "evenly"))
 818                         config->input_justification =
 819                                 ADV7511_INPUT_JUSTIFICATION_EVENLY;
 820                 else if (!strcmp(str, "right"))
 821                         config->input_justification =
 822                                 ADV7511_INPUT_JUSTIFICATION_RIGHT;
 823                 else
 824                         return -EINVAL;
 825
 826         } else {
 827                 config->input_style = 1;
 828                 config->input_justification = ADV7511_INPUT_JUSTIFICATION_LEFT;
 829         }
 830
 831         of_property_read_u32(np, "adi,clock-delay", &config->clock_delay);
 832         if (config->clock_delay < -1200 || config->clock_delay > 1600)
 833                 return -EINVAL;
 834
 835         config->embedded_sync = of_property_read_bool(np, "adi,embedded-sync");
 836
 837         /* Hardcode the sync pulse configurations for now. */
 838         config->sync_pulse = ADV7511_INPUT_SYNC_PULSE_NONE;
 839         config->vsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
 840         config->hsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
 841
 842         return 0;
 843 }
 844
 845 static const int edid_i2c_addr = 0x7e;
 846 static const int packet_i2c_addr = 0x70;
 847 static const int cec_i2c_addr = 0x78;
 848
 849 static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 850 {
 851         struct adv7511_link_config link_config;
 852         struct adv7511 *adv7511;
 853         struct device *dev = &i2c->dev;
 854         unsigned int val;
 855         int ret;
 856
 857         if (!dev->of_node)
 858                 return -EINVAL;
 859
 860         adv7511 = devm_kzalloc(dev, sizeof(*adv7511), GFP_KERNEL);
 861         if (!adv7511)
 862                 return -ENOMEM;
 863
 864         adv7511->dpms_mode = DRM_MODE_DPMS_OFF;
 865         adv7511->status = connector_status_disconnected;
 866
 867         ret = adv7511_parse_dt(dev->of_node, &link_config);
 868         if (ret)
 869                 return ret;
 870
 871         /*
 872          * The power down GPIO is optional. If present, toggle it from active to
 873          * inactive to wake up the encoder.
 874          */
 875         adv7511->gpio_pd = devm_gpiod_get_optional(dev, "pd", GPIOD_OUT_HIGH);
 876         if (IS_ERR(adv7511->gpio_pd))
 877                 return PTR_ERR(adv7511->gpio_pd);
 878
 879         if (adv7511->gpio_pd) {
 880                 mdelay(5);
 881                 gpiod_set_value_cansleep(adv7511->gpio_pd, 0);
 882         }
 883
 884         adv7511->regmap = devm_regmap_init_i2c(i2c, &adv7511_regmap_config);
 885         if (IS_ERR(adv7511->regmap))
 886                 return PTR_ERR(adv7511->regmap);
 887
 888         ret = regmap_read(adv7511->regmap, ADV7511_REG_CHIP_REVISION, &val);
 889         if (ret)
 890                 return ret;
 891         dev_dbg(dev, "Rev. %d\n", val);
 892
 893         ret = regmap_register_patch(adv7511->regmap, adv7511_fixed_registers,
 894                                     ARRAY_SIZE(adv7511_fixed_registers));
 895         if (ret)
 896                 return ret;
 897
 898         regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
 899         regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
 900                      packet_i2c_addr);
 901         regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, cec_i2c_addr);
 902         adv7511_packet_disable(adv7511, 0xffff);
 903
 904         adv7511->i2c_main = i2c;
 905         adv7511->i2c_edid = i2c_new_dummy(i2c->adapter, edid_i2c_addr >> 1);
 906         if (!adv7511->i2c_edid)
 907                 return -ENOMEM;
 908
 909         if (i2c->irq) {
 910                 init_waitqueue_head(&adv7511->wq);
 911
 912                 ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
 913                                                 adv7511_irq_handler,
 914                                                 IRQF_ONESHOT, dev_name(dev),
 915                                                 adv7511);
 916                 if (ret)
 917                         goto err_i2c_unregister_device;
 918         }
 919
 920         /* CEC is unused for now */
 921         regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL,
 922                      ADV7511_CEC_CTRL_POWER_DOWN);
 923
 924         regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 925                            ADV7511_POWER_POWER_DOWN, ADV7511_POWER_POWER_DOWN);
 926
 927         adv7511->current_edid_segment = -1;
 928
 929         i2c_set_clientdata(i2c, adv7511);
 930
 931         adv7511_set_link_config(adv7511, &link_config);
 932
 933         return 0;
 934
 935 err_i2c_unregister_device:
 936         i2c_unregister_device(adv7511->i2c_edid);
 937
 938         return ret;
 939 }
 940
 941 static int adv7511_remove(struct i2c_client *i2c)
 942 {
 943         struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
 944
 945         i2c_unregister_device(adv7511->i2c_edid);
 946
 947         kfree(adv7511->edid);
 948
 949         return 0;
 950 }
 951
 952 static int adv7511_encoder_init(struct i2c_client *i2c, struct drm_device *dev,
 953                                 struct drm_encoder_slave *encoder)
 954 {
 955
 956         struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
 957
 958         encoder->slave_priv = adv7511;
 959         encoder->slave_funcs = &adv7511_encoder_funcs;
 960
 961         adv7511->encoder = &encoder->base;
 962
 963         return 0;
 964 }
 965
 966 static const struct i2c_device_id adv7511_i2c_ids[] = {
 967         { "adv7511", 0 },
 968         { "adv7511w", 0 },
 969         { "adv7513", 0 },
 970         { }
 971 };
 972 MODULE_DEVICE_TABLE(i2c, adv7511_i2c_ids);
 973
 974 static const struct of_device_id adv7511_of_ids[] = {
 975         { .compatible = "adi,adv7511", },
 976         { .compatible = "adi,adv7511w", },
 977         { .compatible = "adi,adv7513", },
 978         { }
 979 };
 980 MODULE_DEVICE_TABLE(of, adv7511_of_ids);
 981
 982 static struct drm_i2c_encoder_driver adv7511_driver = {
 983         .i2c_driver = {
 984                 .driver = {
 985                         .name = "adv7511",
 986                         .of_match_table = adv7511_of_ids,
 987                 },
 988                 .id_table = adv7511_i2c_ids,
 989                 .probe = adv7511_probe,
 990                 .remove = adv7511_remove,
 991         },
 992
 993         .encoder_init = adv7511_encoder_init,
 994 };
 995
 996 static int __init adv7511_init(void)
 997 {
 998         return drm_i2c_encoder_register(THIS_MODULE, &adv7511_driver);
 999 }
1000 module_init(adv7511_init);
1001
1002 static void __exit adv7511_exit(void)
1003 {
1004         drm_i2c_encoder_unregister(&adv7511_driver);
1005 }
1006 module_exit(adv7511_exit);
1007
1008 MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
1009 MODULE_DESCRIPTION("ADV7511 HDMI transmitter driver");
1010 MODULE_LICENSE("GPL");