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         bool powered;
  31
  32         unsigned int f_tmds;
  33
  34         unsigned int current_edid_segment;
  35         uint8_t edid_buf[256];
  36         bool edid_read;
  37
  38         wait_queue_head_t wq;
  39         struct drm_encoder *encoder;
  40
  41         bool embedded_sync;
  42         enum adv7511_sync_polarity vsync_polarity;
  43         enum adv7511_sync_polarity hsync_polarity;
  44         bool rgb;
  45
  46         struct edid *edid;
  47
  48         struct gpio_desc *gpio_pd;
  49 };
  50
  51 static struct adv7511 *encoder_to_adv7511(struct drm_encoder *encoder)
  52 {
  53         return to_encoder_slave(encoder)->slave_priv;
  54 }
  55
  56 /* ADI recommended values for proper operation. */
  57 static const struct reg_sequence adv7511_fixed_registers[] = {
  58         { 0x98, 0x03 },
  59         { 0x9a, 0xe0 },
  60         { 0x9c, 0x30 },
  61         { 0x9d, 0x61 },
  62         { 0xa2, 0xa4 },
  63         { 0xa3, 0xa4 },
  64         { 0xe0, 0xd0 },
  65         { 0xf9, 0x00 },
  66         { 0x55, 0x02 },
  67 };
  68
  69 /* -----------------------------------------------------------------------------
  70  * Register access
  71  */
  72
  73 static const uint8_t adv7511_register_defaults[] = {
  74         0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 00 */
  75         0x00, 0x00, 0x01, 0x0e, 0xbc, 0x18, 0x01, 0x13,
  76         0x25, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 10 */
  77         0x46, 0x62, 0x04, 0xa8, 0x00, 0x00, 0x1c, 0x84,
  78         0x1c, 0xbf, 0x04, 0xa8, 0x1e, 0x70, 0x02, 0x1e, /* 20 */
  79         0x00, 0x00, 0x04, 0xa8, 0x08, 0x12, 0x1b, 0xac,
  80         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 30 */
  81         0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0xb0,
  82         0x00, 0x50, 0x90, 0x7e, 0x79, 0x70, 0x00, 0x00, /* 40 */
  83         0x00, 0xa8, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  84         0x00, 0x00, 0x02, 0x0d, 0x00, 0x00, 0x00, 0x00, /* 50 */
  85         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  86         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 60 */
  87         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  88         0x01, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 70 */
  89         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  90         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 80 */
  91         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  92         0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00, /* 90 */
  93         0x0b, 0x02, 0x00, 0x18, 0x5a, 0x60, 0x00, 0x00,
  94         0x00, 0x00, 0x80, 0x80, 0x08, 0x04, 0x00, 0x00, /* a0 */
  95         0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x40, 0x14,
  96         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* b0 */
  97         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  98         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* c0 */
  99         0x00, 0x03, 0x00, 0x00, 0x02, 0x00, 0x01, 0x04,
 100         0x30, 0xff, 0x80, 0x80, 0x80, 0x00, 0x00, 0x00, /* d0 */
 101         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x01,
 102         0x80, 0x75, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, /* e0 */
 103         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 104         0x00, 0x00, 0x00, 0x00, 0x00, 0x75, 0x11, 0x00, /* f0 */
 105         0x00, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 106 };
 107
 108 static bool adv7511_register_volatile(struct device *dev, unsigned int reg)
 109 {
 110         switch (reg) {
 111         case ADV7511_REG_CHIP_REVISION:
 112         case ADV7511_REG_SPDIF_FREQ:
 113         case ADV7511_REG_CTS_AUTOMATIC1:
 114         case ADV7511_REG_CTS_AUTOMATIC2:
 115         case ADV7511_REG_VIC_DETECTED:
 116         case ADV7511_REG_VIC_SEND:
 117         case ADV7511_REG_AUX_VIC_DETECTED:
 118         case ADV7511_REG_STATUS:
 119         case ADV7511_REG_GC(1):
 120         case ADV7511_REG_INT(0):
 121         case ADV7511_REG_INT(1):
 122         case ADV7511_REG_PLL_STATUS:
 123         case ADV7511_REG_AN(0):
 124         case ADV7511_REG_AN(1):
 125         case ADV7511_REG_AN(2):
 126         case ADV7511_REG_AN(3):
 127         case ADV7511_REG_AN(4):
 128         case ADV7511_REG_AN(5):
 129         case ADV7511_REG_AN(6):
 130         case ADV7511_REG_AN(7):
 131         case ADV7511_REG_HDCP_STATUS:
 132         case ADV7511_REG_BCAPS:
 133         case ADV7511_REG_BKSV(0):
 134         case ADV7511_REG_BKSV(1):
 135         case ADV7511_REG_BKSV(2):
 136         case ADV7511_REG_BKSV(3):
 137         case ADV7511_REG_BKSV(4):
 138         case ADV7511_REG_DDC_STATUS:
 139         case ADV7511_REG_EDID_READ_CTRL:
 140         case ADV7511_REG_BSTATUS(0):
 141         case ADV7511_REG_BSTATUS(1):
 142         case ADV7511_REG_CHIP_ID_HIGH:
 143         case ADV7511_REG_CHIP_ID_LOW:
 144                 return true;
 145         }
 146
 147         return false;
 148 }
 149
 150 static const struct regmap_config adv7511_regmap_config = {
 151         .reg_bits = 8,
 152         .val_bits = 8,
 153
 154         .max_register = 0xff,
 155         .cache_type = REGCACHE_RBTREE,
 156         .reg_defaults_raw = adv7511_register_defaults,
 157         .num_reg_defaults_raw = ARRAY_SIZE(adv7511_register_defaults),
 158
 159         .volatile_reg = adv7511_register_volatile,
 160 };
 161
 162 /* -----------------------------------------------------------------------------
 163  * Hardware configuration
 164  */
 165
 166 static void adv7511_set_colormap(struct adv7511 *adv7511, bool enable,
 167                                  const uint16_t *coeff,
 168                                  unsigned int scaling_factor)
 169 {
 170         unsigned int i;
 171
 172         regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
 173                            ADV7511_CSC_UPDATE_MODE, ADV7511_CSC_UPDATE_MODE);
 174
 175         if (enable) {
 176                 for (i = 0; i < 12; ++i) {
 177                         regmap_update_bits(adv7511->regmap,
 178                                            ADV7511_REG_CSC_UPPER(i),
 179                                            0x1f, coeff[i] >> 8);
 180                         regmap_write(adv7511->regmap,
 181                                      ADV7511_REG_CSC_LOWER(i),
 182                                      coeff[i] & 0xff);
 183                 }
 184         }
 185
 186         if (enable)
 187                 regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
 188                                    0xe0, 0x80 | (scaling_factor << 5));
 189         else
 190                 regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(0),
 191                                    0x80, 0x00);
 192
 193         regmap_update_bits(adv7511->regmap, ADV7511_REG_CSC_UPPER(1),
 194                            ADV7511_CSC_UPDATE_MODE, 0);
 195 }
 196
 197 static int adv7511_packet_enable(struct adv7511 *adv7511, unsigned int packet)
 198 {
 199         if (packet & 0xff)
 200                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
 201                                    packet, 0xff);
 202
 203         if (packet & 0xff00) {
 204                 packet >>= 8;
 205                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 206                                    packet, 0xff);
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int adv7511_packet_disable(struct adv7511 *adv7511, unsigned int packet)
 213 {
 214         if (packet & 0xff)
 215                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE0,
 216                                    packet, 0x00);
 217
 218         if (packet & 0xff00) {
 219                 packet >>= 8;
 220                 regmap_update_bits(adv7511->regmap, ADV7511_REG_PACKET_ENABLE1,
 221                                    packet, 0x00);
 222         }
 223
 224         return 0;
 225 }
 226
 227 /* Coefficients for adv7511 color space conversion */
 228 static const uint16_t adv7511_csc_ycbcr_to_rgb[] = {
 229         0x0734, 0x04ad, 0x0000, 0x1c1b,
 230         0x1ddc, 0x04ad, 0x1f24, 0x0135,
 231         0x0000, 0x04ad, 0x087c, 0x1b77,
 232 };
 233
 234 static void adv7511_set_config_csc(struct adv7511 *adv7511,
 235                                    struct drm_connector *connector,
 236                                    bool rgb)
 237 {
 238         struct adv7511_video_config config;
 239         bool output_format_422, output_format_ycbcr;
 240         unsigned int mode;
 241         uint8_t infoframe[17];
 242
 243         if (adv7511->edid)
 244                 config.hdmi_mode = drm_detect_hdmi_monitor(adv7511->edid);
 245         else
 246                 config.hdmi_mode = false;
 247
 248         hdmi_avi_infoframe_init(&config.avi_infoframe);
 249
 250         config.avi_infoframe.scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
 251
 252         if (rgb) {
 253                 config.csc_enable = false;
 254                 config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
 255         } else {
 256                 config.csc_scaling_factor = ADV7511_CSC_SCALING_4;
 257                 config.csc_coefficents = adv7511_csc_ycbcr_to_rgb;
 258
 259                 if ((connector->display_info.color_formats &
 260                      DRM_COLOR_FORMAT_YCRCB422) &&
 261                     config.hdmi_mode) {
 262                         config.csc_enable = false;
 263                         config.avi_infoframe.colorspace =
 264                                 HDMI_COLORSPACE_YUV422;
 265                 } else {
 266                         config.csc_enable = true;
 267                         config.avi_infoframe.colorspace = HDMI_COLORSPACE_RGB;
 268                 }
 269         }
 270
 271         if (config.hdmi_mode) {
 272                 mode = ADV7511_HDMI_CFG_MODE_HDMI;
 273
 274                 switch (config.avi_infoframe.colorspace) {
 275                 case HDMI_COLORSPACE_YUV444:
 276                         output_format_422 = false;
 277                         output_format_ycbcr = true;
 278                         break;
 279                 case HDMI_COLORSPACE_YUV422:
 280                         output_format_422 = true;
 281                         output_format_ycbcr = true;
 282                         break;
 283                 default:
 284                         output_format_422 = false;
 285                         output_format_ycbcr = false;
 286                         break;
 287                 }
 288         } else {
 289                 mode = ADV7511_HDMI_CFG_MODE_DVI;
 290                 output_format_422 = false;
 291                 output_format_ycbcr = false;
 292         }
 293
 294         adv7511_packet_disable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
 295
 296         adv7511_set_colormap(adv7511, config.csc_enable,
 297                              config.csc_coefficents,
 298                              config.csc_scaling_factor);
 299
 300         regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x81,
 301                            (output_format_422 << 7) | output_format_ycbcr);
 302
 303         regmap_update_bits(adv7511->regmap, ADV7511_REG_HDCP_HDMI_CFG,
 304                            ADV7511_HDMI_CFG_MODE_MASK, mode);
 305
 306         hdmi_avi_infoframe_pack(&config.avi_infoframe, infoframe,
 307                                 sizeof(infoframe));
 308
 309         /* The AVI infoframe id is not configurable */
 310         regmap_bulk_write(adv7511->regmap, ADV7511_REG_AVI_INFOFRAME_VERSION,
 311                           infoframe + 1, sizeof(infoframe) - 1);
 312
 313         adv7511_packet_enable(adv7511, ADV7511_PACKET_ENABLE_AVI_INFOFRAME);
 314 }
 315
 316 static void adv7511_set_link_config(struct adv7511 *adv7511,
 317                                     const struct adv7511_link_config *config)
 318 {
 319         /*
 320          * The input style values documented in the datasheet don't match the
 321          * hardware register field values :-(
 322          */
 323         static const unsigned int input_styles[4] = { 0, 2, 1, 3 };
 324
 325         unsigned int clock_delay;
 326         unsigned int color_depth;
 327         unsigned int input_id;
 328
 329         clock_delay = (config->clock_delay + 1200) / 400;
 330         color_depth = config->input_color_depth == 8 ? 3
 331                     : (config->input_color_depth == 10 ? 1 : 2);
 332
 333         /* TODO Support input ID 6 */
 334         if (config->input_colorspace != HDMI_COLORSPACE_YUV422)
 335                 input_id = config->input_clock == ADV7511_INPUT_CLOCK_DDR
 336                          ? 5 : 0;
 337         else if (config->input_clock == ADV7511_INPUT_CLOCK_DDR)
 338                 input_id = config->embedded_sync ? 8 : 7;
 339         else if (config->input_clock == ADV7511_INPUT_CLOCK_2X)
 340                 input_id = config->embedded_sync ? 4 : 3;
 341         else
 342                 input_id = config->embedded_sync ? 2 : 1;
 343
 344         regmap_update_bits(adv7511->regmap, ADV7511_REG_I2C_FREQ_ID_CFG, 0xf,
 345                            input_id);
 346         regmap_update_bits(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG1, 0x7e,
 347                            (color_depth << 4) |
 348                            (input_styles[config->input_style] << 2));
 349         regmap_write(adv7511->regmap, ADV7511_REG_VIDEO_INPUT_CFG2,
 350                      config->input_justification << 3);
 351         regmap_write(adv7511->regmap, ADV7511_REG_TIMING_GEN_SEQ,
 352                      config->sync_pulse << 2);
 353
 354         regmap_write(adv7511->regmap, 0xba, clock_delay << 5);
 355
 356         adv7511->embedded_sync = config->embedded_sync;
 357         adv7511->hsync_polarity = config->hsync_polarity;
 358         adv7511->vsync_polarity = config->vsync_polarity;
 359         adv7511->rgb = config->input_colorspace == HDMI_COLORSPACE_RGB;
 360 }
 361
 362 static void adv7511_power_on(struct adv7511 *adv7511)
 363 {
 364         adv7511->current_edid_segment = -1;
 365
 366         regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 367                            ADV7511_POWER_POWER_DOWN, 0);
 368         if (adv7511->i2c_main->irq) {
 369                 /*
 370                  * Documentation says the INT_ENABLE registers are reset in
 371                  * POWER_DOWN mode. My 7511w preserved the bits, however.
 372                  * Still, let's be safe and stick to the documentation.
 373                  */
 374                 regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
 375                              ADV7511_INT0_EDID_READY);
 376                 regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
 377                              ADV7511_INT1_DDC_ERROR);
 378         }
 379
 380         /*
 381          * Per spec it is allowed to pulse the HPD signal to indicate that the
 382          * EDID information has changed. Some monitors do this when they wakeup
 383          * from standby or are enabled. When the HPD goes low the adv7511 is
 384          * reset and the outputs are disabled which might cause the monitor to
 385          * go to standby again. To avoid this we ignore the HPD pin for the
 386          * first few seconds after enabling the output.
 387          */
 388         regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 389                            ADV7511_REG_POWER2_HPD_SRC_MASK,
 390                            ADV7511_REG_POWER2_HPD_SRC_NONE);
 391
 392         /*
 393          * Most of the registers are reset during power down or when HPD is low.
 394          */
 395         regcache_sync(adv7511->regmap);
 396
 397         adv7511->powered = true;
 398 }
 399
 400 static void adv7511_power_off(struct adv7511 *adv7511)
 401 {
 402         /* TODO: setup additional power down modes */
 403         regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 404                            ADV7511_POWER_POWER_DOWN,
 405                            ADV7511_POWER_POWER_DOWN);
 406         regcache_mark_dirty(adv7511->regmap);
 407
 408         adv7511->powered = false;
 409 }
 410
 411 /* -----------------------------------------------------------------------------
 412  * Interrupt and hotplug detection
 413  */
 414
 415 static bool adv7511_hpd(struct adv7511 *adv7511)
 416 {
 417         unsigned int irq0;
 418         int ret;
 419
 420         ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
 421         if (ret < 0)
 422                 return false;
 423
 424         if (irq0 & ADV7511_INT0_HPD) {
 425                 regmap_write(adv7511->regmap, ADV7511_REG_INT(0),
 426                              ADV7511_INT0_HPD);
 427                 return true;
 428         }
 429
 430         return false;
 431 }
 432
 433 static int adv7511_irq_process(struct adv7511 *adv7511)
 434 {
 435         unsigned int irq0, irq1;
 436         int ret;
 437
 438         ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(0), &irq0);
 439         if (ret < 0)
 440                 return ret;
 441
 442         ret = regmap_read(adv7511->regmap, ADV7511_REG_INT(1), &irq1);
 443         if (ret < 0)
 444                 return ret;
 445
 446         regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0);
 447         regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1);
 448
 449         if (irq0 & ADV7511_INT0_HPD && adv7511->encoder)
 450                 drm_helper_hpd_irq_event(adv7511->encoder->dev);
 451
 452         if (irq0 & ADV7511_INT0_EDID_READY || irq1 & ADV7511_INT1_DDC_ERROR) {
 453                 adv7511->edid_read = true;
 454
 455                 if (adv7511->i2c_main->irq)
 456                         wake_up_all(&adv7511->wq);
 457         }
 458
 459         return 0;
 460 }
 461
 462 static irqreturn_t adv7511_irq_handler(int irq, void *devid)
 463 {
 464         struct adv7511 *adv7511 = devid;
 465         int ret;
 466
 467         ret = adv7511_irq_process(adv7511);
 468         return ret < 0 ? IRQ_NONE : IRQ_HANDLED;
 469 }
 470
 471 /* -----------------------------------------------------------------------------
 472  * EDID retrieval
 473  */
 474
 475 static int adv7511_wait_for_edid(struct adv7511 *adv7511, int timeout)
 476 {
 477         int ret;
 478
 479         if (adv7511->i2c_main->irq) {
 480                 ret = wait_event_interruptible_timeout(adv7511->wq,
 481                                 adv7511->edid_read, msecs_to_jiffies(timeout));
 482         } else {
 483                 for (; timeout > 0; timeout -= 25) {
 484                         ret = adv7511_irq_process(adv7511);
 485                         if (ret < 0)
 486                                 break;
 487
 488                         if (adv7511->edid_read)
 489                                 break;
 490
 491                         msleep(25);
 492                 }
 493         }
 494
 495         return adv7511->edid_read ? 0 : -EIO;
 496 }
 497
 498 static int adv7511_get_edid_block(void *data, u8 *buf, unsigned int block,
 499                                   size_t len)
 500 {
 501         struct adv7511 *adv7511 = data;
 502         struct i2c_msg xfer[2];
 503         uint8_t offset;
 504         unsigned int i;
 505         int ret;
 506
 507         if (len > 128)
 508                 return -EINVAL;
 509
 510         if (adv7511->current_edid_segment != block / 2) {
 511                 unsigned int status;
 512
 513                 ret = regmap_read(adv7511->regmap, ADV7511_REG_DDC_STATUS,
 514                                   &status);
 515                 if (ret < 0)
 516                         return ret;
 517
 518                 if (status != 2) {
 519                         adv7511->edid_read = false;
 520                         regmap_write(adv7511->regmap, ADV7511_REG_EDID_SEGMENT,
 521                                      block);
 522                         ret = adv7511_wait_for_edid(adv7511, 200);
 523                         if (ret < 0)
 524                                 return ret;
 525                 }
 526
 527                 /* Break this apart, hopefully more I2C controllers will
 528                  * support 64 byte transfers than 256 byte transfers
 529                  */
 530
 531                 xfer[0].addr = adv7511->i2c_edid->addr;
 532                 xfer[0].flags = 0;
 533                 xfer[0].len = 1;
 534                 xfer[0].buf = &offset;
 535                 xfer[1].addr = adv7511->i2c_edid->addr;
 536                 xfer[1].flags = I2C_M_RD;
 537                 xfer[1].len = 64;
 538                 xfer[1].buf = adv7511->edid_buf;
 539
 540                 offset = 0;
 541
 542                 for (i = 0; i < 4; ++i) {
 543                         ret = i2c_transfer(adv7511->i2c_edid->adapter, xfer,
 544                                            ARRAY_SIZE(xfer));
 545                         if (ret < 0)
 546                                 return ret;
 547                         else if (ret != 2)
 548                                 return -EIO;
 549
 550                         xfer[1].buf += 64;
 551                         offset += 64;
 552                 }
 553
 554                 adv7511->current_edid_segment = block / 2;
 555         }
 556
 557         if (block % 2 == 0)
 558                 memcpy(buf, adv7511->edid_buf, len);
 559         else
 560                 memcpy(buf, adv7511->edid_buf + 128, len);
 561
 562         return 0;
 563 }
 564
 565 /* -----------------------------------------------------------------------------
 566  * Encoder operations
 567  */
 568
 569 static int adv7511_get_modes(struct drm_encoder *encoder,
 570                              struct drm_connector *connector)
 571 {
 572         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 573         struct edid *edid;
 574         unsigned int count;
 575
 576         /* Reading the EDID only works if the device is powered */
 577         if (!adv7511->powered) {
 578                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 579                                    ADV7511_POWER_POWER_DOWN, 0);
 580                 if (adv7511->i2c_main->irq) {
 581                         regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(0),
 582                                      ADV7511_INT0_EDID_READY);
 583                         regmap_write(adv7511->regmap, ADV7511_REG_INT_ENABLE(1),
 584                                      ADV7511_INT1_DDC_ERROR);
 585                 }
 586                 adv7511->current_edid_segment = -1;
 587         }
 588
 589         edid = drm_do_get_edid(connector, adv7511_get_edid_block, adv7511);
 590
 591         if (!adv7511->powered)
 592                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER,
 593                                    ADV7511_POWER_POWER_DOWN,
 594                                    ADV7511_POWER_POWER_DOWN);
 595
 596         kfree(adv7511->edid);
 597         adv7511->edid = edid;
 598         if (!edid)
 599                 return 0;
 600
 601         drm_mode_connector_update_edid_property(connector, edid);
 602         count = drm_add_edid_modes(connector, edid);
 603
 604         adv7511_set_config_csc(adv7511, connector, adv7511->rgb);
 605
 606         return count;
 607 }
 608
 609 static void adv7511_encoder_dpms(struct drm_encoder *encoder, int mode)
 610 {
 611         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 612
 613         if (mode == DRM_MODE_DPMS_ON)
 614                 adv7511_power_on(adv7511);
 615         else
 616                 adv7511_power_off(adv7511);
 617 }
 618
 619 static enum drm_connector_status
 620 adv7511_encoder_detect(struct drm_encoder *encoder,
 621                        struct drm_connector *connector)
 622 {
 623         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 624         enum drm_connector_status status;
 625         unsigned int val;
 626         bool hpd;
 627         int ret;
 628
 629         ret = regmap_read(adv7511->regmap, ADV7511_REG_STATUS, &val);
 630         if (ret < 0)
 631                 return connector_status_disconnected;
 632
 633         if (val & ADV7511_STATUS_HPD)
 634                 status = connector_status_connected;
 635         else
 636                 status = connector_status_disconnected;
 637
 638         hpd = adv7511_hpd(adv7511);
 639
 640         /* The chip resets itself when the cable is disconnected, so in case
 641          * there is a pending HPD interrupt and the cable is connected there was
 642          * at least one transition from disconnected to connected and the chip
 643          * has to be reinitialized. */
 644         if (status == connector_status_connected && hpd && adv7511->powered) {
 645                 regcache_mark_dirty(adv7511->regmap);
 646                 adv7511_power_on(adv7511);
 647                 adv7511_get_modes(encoder, connector);
 648                 if (adv7511->status == connector_status_connected)
 649                         status = connector_status_disconnected;
 650         } else {
 651                 /* Renable HPD sensing */
 652                 regmap_update_bits(adv7511->regmap, ADV7511_REG_POWER2,
 653                                    ADV7511_REG_POWER2_HPD_SRC_MASK,
 654                                    ADV7511_REG_POWER2_HPD_SRC_BOTH);
 655         }
 656
 657         adv7511->status = status;
 658         return status;
 659 }
 660
 661 static int adv7511_encoder_mode_valid(struct drm_encoder *encoder,
 662                                       struct drm_display_mode *mode)
 663 {
 664         if (mode->clock > 165000)
 665                 return MODE_CLOCK_HIGH;
 666
 667         return MODE_OK;
 668 }
 669
 670 static void adv7511_encoder_mode_set(struct drm_encoder *encoder,
 671                                      struct drm_display_mode *mode,
 672                                      struct drm_display_mode *adj_mode)
 673 {
 674         struct adv7511 *adv7511 = encoder_to_adv7511(encoder);
 675         unsigned int low_refresh_rate;
 676         unsigned int hsync_polarity = 0;
 677         unsigned int vsync_polarity = 0;
 678
 679         if (adv7511->embedded_sync) {
 680                 unsigned int hsync_offset, hsync_len;
 681                 unsigned int vsync_offset, vsync_len;
 682
 683                 hsync_offset = adj_mode->crtc_hsync_start -
 684                                adj_mode->crtc_hdisplay;
 685                 vsync_offset = adj_mode->crtc_vsync_start -
 686                                adj_mode->crtc_vdisplay;
 687                 hsync_len = adj_mode->crtc_hsync_end -
 688                             adj_mode->crtc_hsync_start;
 689                 vsync_len = adj_mode->crtc_vsync_end -
 690                             adj_mode->crtc_vsync_start;
 691
 692                 /* The hardware vsync generator has a off-by-one bug */
 693                 vsync_offset += 1;
 694
 695                 regmap_write(adv7511->regmap, ADV7511_REG_HSYNC_PLACEMENT_MSB,
 696                              ((hsync_offset >> 10) & 0x7) << 5);
 697                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(0),
 698                              (hsync_offset >> 2) & 0xff);
 699                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(1),
 700                              ((hsync_offset & 0x3) << 6) |
 701                              ((hsync_len >> 4) & 0x3f));
 702                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(2),
 703                              ((hsync_len & 0xf) << 4) |
 704                              ((vsync_offset >> 6) & 0xf));
 705                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(3),
 706                              ((vsync_offset & 0x3f) << 2) |
 707                              ((vsync_len >> 8) & 0x3));
 708                 regmap_write(adv7511->regmap, ADV7511_REG_SYNC_DECODER(4),
 709                              vsync_len & 0xff);
 710
 711                 hsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PHSYNC);
 712                 vsync_polarity = !(adj_mode->flags & DRM_MODE_FLAG_PVSYNC);
 713         } else {
 714                 enum adv7511_sync_polarity mode_hsync_polarity;
 715                 enum adv7511_sync_polarity mode_vsync_polarity;
 716
 717                 /**
 718                  * If the input signal is always low or always high we want to
 719                  * invert or let it passthrough depending on the polarity of the
 720                  * current mode.
 721                  **/
 722                 if (adj_mode->flags & DRM_MODE_FLAG_NHSYNC)
 723                         mode_hsync_polarity = ADV7511_SYNC_POLARITY_LOW;
 724                 else
 725                         mode_hsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
 726
 727                 if (adj_mode->flags & DRM_MODE_FLAG_NVSYNC)
 728                         mode_vsync_polarity = ADV7511_SYNC_POLARITY_LOW;
 729                 else
 730                         mode_vsync_polarity = ADV7511_SYNC_POLARITY_HIGH;
 731
 732                 if (adv7511->hsync_polarity != mode_hsync_polarity &&
 733                     adv7511->hsync_polarity !=
 734                     ADV7511_SYNC_POLARITY_PASSTHROUGH)
 735                         hsync_polarity = 1;
 736
 737                 if (adv7511->vsync_polarity != mode_vsync_polarity &&
 738                     adv7511->vsync_polarity !=
 739                     ADV7511_SYNC_POLARITY_PASSTHROUGH)
 740                         vsync_polarity = 1;
 741         }
 742
 743         if (mode->vrefresh <= 24000)
 744                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_24HZ;
 745         else if (mode->vrefresh <= 25000)
 746                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_25HZ;
 747         else if (mode->vrefresh <= 30000)
 748                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_30HZ;
 749         else
 750                 low_refresh_rate = ADV7511_LOW_REFRESH_RATE_NONE;
 751
 752         regmap_update_bits(adv7511->regmap, 0xfb,
 753                 0x6, low_refresh_rate << 1);
 754         regmap_update_bits(adv7511->regmap, 0x17,
 755                 0x60, (vsync_polarity << 6) | (hsync_polarity << 5));
 756
 757         /*
 758          * TODO Test first order 4:2:2 to 4:4:4 up conversion method, which is
 759          * supposed to give better results.
 760          */
 761
 762         adv7511->f_tmds = mode->clock;
 763 }
 764
 765 static const struct drm_encoder_slave_funcs adv7511_encoder_funcs = {
 766         .dpms = adv7511_encoder_dpms,
 767         .mode_valid = adv7511_encoder_mode_valid,
 768         .mode_set = adv7511_encoder_mode_set,
 769         .detect = adv7511_encoder_detect,
 770         .get_modes = adv7511_get_modes,
 771 };
 772
 773 /* -----------------------------------------------------------------------------
 774  * Probe & remove
 775  */
 776
 777 static int adv7511_parse_dt(struct device_node *np,
 778                             struct adv7511_link_config *config)
 779 {
 780         const char *str;
 781         int ret;
 782
 783         memset(config, 0, sizeof(*config));
 784
 785         of_property_read_u32(np, "adi,input-depth", &config->input_color_depth);
 786         if (config->input_color_depth != 8 && config->input_color_depth != 10 &&
 787             config->input_color_depth != 12)
 788                 return -EINVAL;
 789
 790         ret = of_property_read_string(np, "adi,input-colorspace", &str);
 791         if (ret < 0)
 792                 return ret;
 793
 794         if (!strcmp(str, "rgb"))
 795                 config->input_colorspace = HDMI_COLORSPACE_RGB;
 796         else if (!strcmp(str, "yuv422"))
 797                 config->input_colorspace = HDMI_COLORSPACE_YUV422;
 798         else if (!strcmp(str, "yuv444"))
 799                 config->input_colorspace = HDMI_COLORSPACE_YUV444;
 800         else
 801                 return -EINVAL;
 802
 803         ret = of_property_read_string(np, "adi,input-clock", &str);
 804         if (ret < 0)
 805                 return ret;
 806
 807         if (!strcmp(str, "1x"))
 808                 config->input_clock = ADV7511_INPUT_CLOCK_1X;
 809         else if (!strcmp(str, "2x"))
 810                 config->input_clock = ADV7511_INPUT_CLOCK_2X;
 811         else if (!strcmp(str, "ddr"))
 812                 config->input_clock = ADV7511_INPUT_CLOCK_DDR;
 813         else
 814                 return -EINVAL;
 815
 816         if (config->input_colorspace == HDMI_COLORSPACE_YUV422 ||
 817             config->input_clock != ADV7511_INPUT_CLOCK_1X) {
 818                 ret = of_property_read_u32(np, "adi,input-style",
 819                                            &config->input_style);
 820                 if (ret)
 821                         return ret;
 822
 823                 if (config->input_style < 1 || config->input_style > 3)
 824                         return -EINVAL;
 825
 826                 ret = of_property_read_string(np, "adi,input-justification",
 827                                               &str);
 828                 if (ret < 0)
 829                         return ret;
 830
 831                 if (!strcmp(str, "left"))
 832                         config->input_justification =
 833                                 ADV7511_INPUT_JUSTIFICATION_LEFT;
 834                 else if (!strcmp(str, "evenly"))
 835                         config->input_justification =
 836                                 ADV7511_INPUT_JUSTIFICATION_EVENLY;
 837                 else if (!strcmp(str, "right"))
 838                         config->input_justification =
 839                                 ADV7511_INPUT_JUSTIFICATION_RIGHT;
 840                 else
 841                         return -EINVAL;
 842
 843         } else {
 844                 config->input_style = 1;
 845                 config->input_justification = ADV7511_INPUT_JUSTIFICATION_LEFT;
 846         }
 847
 848         of_property_read_u32(np, "adi,clock-delay", &config->clock_delay);
 849         if (config->clock_delay < -1200 || config->clock_delay > 1600)
 850                 return -EINVAL;
 851
 852         config->embedded_sync = of_property_read_bool(np, "adi,embedded-sync");
 853
 854         /* Hardcode the sync pulse configurations for now. */
 855         config->sync_pulse = ADV7511_INPUT_SYNC_PULSE_NONE;
 856         config->vsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
 857         config->hsync_polarity = ADV7511_SYNC_POLARITY_PASSTHROUGH;
 858
 859         return 0;
 860 }
 861
 862 static const int edid_i2c_addr = 0x7e;
 863 static const int packet_i2c_addr = 0x70;
 864 static const int cec_i2c_addr = 0x78;
 865
 866 static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 867 {
 868         struct adv7511_link_config link_config;
 869         struct adv7511 *adv7511;
 870         struct device *dev = &i2c->dev;
 871         unsigned int val;
 872         int ret;
 873
 874         if (!dev->of_node)
 875                 return -EINVAL;
 876
 877         adv7511 = devm_kzalloc(dev, sizeof(*adv7511), GFP_KERNEL);
 878         if (!adv7511)
 879                 return -ENOMEM;
 880
 881         adv7511->powered = false;
 882         adv7511->status = connector_status_disconnected;
 883
 884         ret = adv7511_parse_dt(dev->of_node, &link_config);
 885         if (ret)
 886                 return ret;
 887
 888         /*
 889          * The power down GPIO is optional. If present, toggle it from active to
 890          * inactive to wake up the encoder.
 891          */
 892         adv7511->gpio_pd = devm_gpiod_get_optional(dev, "pd", GPIOD_OUT_HIGH);
 893         if (IS_ERR(adv7511->gpio_pd))
 894                 return PTR_ERR(adv7511->gpio_pd);
 895
 896         if (adv7511->gpio_pd) {
 897                 mdelay(5);
 898                 gpiod_set_value_cansleep(adv7511->gpio_pd, 0);
 899         }
 900
 901         adv7511->regmap = devm_regmap_init_i2c(i2c, &adv7511_regmap_config);
 902         if (IS_ERR(adv7511->regmap))
 903                 return PTR_ERR(adv7511->regmap);
 904
 905         ret = regmap_read(adv7511->regmap, ADV7511_REG_CHIP_REVISION, &val);
 906         if (ret)
 907                 return ret;
 908         dev_dbg(dev, "Rev. %d\n", val);
 909
 910         ret = regmap_register_patch(adv7511->regmap, adv7511_fixed_registers,
 911                                     ARRAY_SIZE(adv7511_fixed_registers));
 912         if (ret)
 913                 return ret;
 914
 915         regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR, edid_i2c_addr);
 916         regmap_write(adv7511->regmap, ADV7511_REG_PACKET_I2C_ADDR,
 917                      packet_i2c_addr);
 918         regmap_write(adv7511->regmap, ADV7511_REG_CEC_I2C_ADDR, cec_i2c_addr);
 919         adv7511_packet_disable(adv7511, 0xffff);
 920
 921         adv7511->i2c_main = i2c;
 922         adv7511->i2c_edid = i2c_new_dummy(i2c->adapter, edid_i2c_addr >> 1);
 923         if (!adv7511->i2c_edid)
 924                 return -ENOMEM;
 925
 926         if (i2c->irq) {
 927                 init_waitqueue_head(&adv7511->wq);
 928
 929                 ret = devm_request_threaded_irq(dev, i2c->irq, NULL,
 930                                                 adv7511_irq_handler,
 931                                                 IRQF_ONESHOT, dev_name(dev),
 932                                                 adv7511);
 933                 if (ret)
 934                         goto err_i2c_unregister_device;
 935         }
 936
 937         /* CEC is unused for now */
 938         regmap_write(adv7511->regmap, ADV7511_REG_CEC_CTRL,
 939                      ADV7511_CEC_CTRL_POWER_DOWN);
 940
 941         adv7511_power_off(adv7511);
 942
 943         i2c_set_clientdata(i2c, adv7511);
 944
 945         adv7511_set_link_config(adv7511, &link_config);
 946
 947         return 0;
 948
 949 err_i2c_unregister_device:
 950         i2c_unregister_device(adv7511->i2c_edid);
 951
 952         return ret;
 953 }
 954
 955 static int adv7511_remove(struct i2c_client *i2c)
 956 {
 957         struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
 958
 959         i2c_unregister_device(adv7511->i2c_edid);
 960
 961         kfree(adv7511->edid);
 962
 963         return 0;
 964 }
 965
 966 static int adv7511_encoder_init(struct i2c_client *i2c, struct drm_device *dev,
 967                                 struct drm_encoder_slave *encoder)
 968 {
 969
 970         struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
 971
 972         encoder->slave_priv = adv7511;
 973         encoder->slave_funcs = &adv7511_encoder_funcs;
 974
 975         adv7511->encoder = &encoder->base;
 976
 977         return 0;
 978 }
 979
 980 static const struct i2c_device_id adv7511_i2c_ids[] = {
 981         { "adv7511", 0 },
 982         { "adv7511w", 0 },
 983         { "adv7513", 0 },
 984         { }
 985 };
 986 MODULE_DEVICE_TABLE(i2c, adv7511_i2c_ids);
 987
 988 static const struct of_device_id adv7511_of_ids[] = {
 989         { .compatible = "adi,adv7511", },
 990         { .compatible = "adi,adv7511w", },
 991         { .compatible = "adi,adv7513", },
 992         { }
 993 };
 994 MODULE_DEVICE_TABLE(of, adv7511_of_ids);
 995
 996 static struct drm_i2c_encoder_driver adv7511_driver = {
 997         .i2c_driver = {
 998                 .driver = {
 999                         .name = "adv7511",
1000                         .of_match_table = adv7511_of_ids,
1001                 },
1002                 .id_table = adv7511_i2c_ids,
1003                 .probe = adv7511_probe,
1004                 .remove = adv7511_remove,
1005         },
1006
1007         .encoder_init = adv7511_encoder_init,
1008 };
1009
1010 static int __init adv7511_init(void)
1011 {
1012         return drm_i2c_encoder_register(THIS_MODULE, &adv7511_driver);
1013 }
1014 module_init(adv7511_init);
1015
1016 static void __exit adv7511_exit(void)
1017 {
1018         drm_i2c_encoder_unregister(&adv7511_driver);
1019 }
1020 module_exit(adv7511_exit);
1021
1022 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
1023 MODULE_DESCRIPTION("ADV7511 HDMI transmitter driver");
1024 MODULE_LICENSE("GPL");