drivers/gpu/drm/radeon/evergreen_hdmi.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Christian König.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Christian König
  25  *          Rafał Miłecki
  26  */
  27 #include <linux/hdmi.h>
  28 #include <drm/drmP.h>
  29 #include <drm/radeon_drm.h>
  30 #include "radeon.h"
  31 #include "radeon_asic.h"
  32 #include "evergreend.h"
  33 #include "atom.h"
  34
  35 extern void dce6_afmt_write_speaker_allocation(struct drm_encoder *encoder);
  36 extern void dce6_afmt_write_sad_regs(struct drm_encoder *encoder);
  37 extern void dce6_afmt_select_pin(struct drm_encoder *encoder);
  38 extern void dce6_afmt_write_latency_fields(struct drm_encoder *encoder,
  39                                            struct drm_display_mode *mode);
  40
  41 /*
  42  * update the N and CTS parameters for a given pixel clock rate
  43  */
  44 static void evergreen_hdmi_update_ACR(struct drm_encoder *encoder, uint32_t clock)
  45 {
  46         struct drm_device *dev = encoder->dev;
  47         struct radeon_device *rdev = dev->dev_private;
  48         struct radeon_hdmi_acr acr = r600_hdmi_acr(clock);
  49         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
  50         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
  51         uint32_t offset = dig->afmt->offset;
  52
  53         WREG32(HDMI_ACR_32_0 + offset, HDMI_ACR_CTS_32(acr.cts_32khz));
  54         WREG32(HDMI_ACR_32_1 + offset, acr.n_32khz);
  55
  56         WREG32(HDMI_ACR_44_0 + offset, HDMI_ACR_CTS_44(acr.cts_44_1khz));
  57         WREG32(HDMI_ACR_44_1 + offset, acr.n_44_1khz);
  58
  59         WREG32(HDMI_ACR_48_0 + offset, HDMI_ACR_CTS_48(acr.cts_48khz));
  60         WREG32(HDMI_ACR_48_1 + offset, acr.n_48khz);
  61 }
  62
  63 static void dce4_afmt_write_latency_fields(struct drm_encoder *encoder,
  64                                            struct drm_display_mode *mode)
  65 {
  66         struct radeon_device *rdev = encoder->dev->dev_private;
  67         struct drm_connector *connector;
  68         struct radeon_connector *radeon_connector = NULL;
  69         u32 tmp = 0;
  70
  71         list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) {
  72                 if (connector->encoder == encoder) {
  73                         radeon_connector = to_radeon_connector(connector);
  74                         break;
  75                 }
  76         }
  77
  78         if (!radeon_connector) {
  79                 DRM_ERROR("Couldn't find encoder's connector\n");
  80                 return;
  81         }
  82
  83         if (mode->flags & DRM_MODE_FLAG_INTERLACE) {
  84                 if (connector->latency_present[1])
  85                         tmp = VIDEO_LIPSYNC(connector->video_latency[1]) |
  86                                 AUDIO_LIPSYNC(connector->audio_latency[1]);
  87                 else
  88                         tmp = VIDEO_LIPSYNC(255) | AUDIO_LIPSYNC(255);
  89         } else {
  90                 if (connector->latency_present[0])
  91                         tmp = VIDEO_LIPSYNC(connector->video_latency[0]) |
  92                                 AUDIO_LIPSYNC(connector->audio_latency[0]);
  93                 else
  94                         tmp = VIDEO_LIPSYNC(255) | AUDIO_LIPSYNC(255);
  95         }
  96         WREG32(AZ_F0_CODEC_PIN0_CONTROL_RESPONSE_LIPSYNC, tmp);
  97 }
  98
  99 static void dce4_afmt_write_speaker_allocation(struct drm_encoder *encoder)
 100 {
 101         struct radeon_device *rdev = encoder->dev->dev_private;
 102         struct drm_connector *connector;
 103         struct radeon_connector *radeon_connector = NULL;
 104         u32 tmp;
 105         u8 *sadb;
 106         int sad_count;
 107
 108         list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) {
 109                 if (connector->encoder == encoder) {
 110                         radeon_connector = to_radeon_connector(connector);
 111                         break;
 112                 }
 113         }
 114
 115         if (!radeon_connector) {
 116                 DRM_ERROR("Couldn't find encoder's connector\n");
 117                 return;
 118         }
 119
 120         sad_count = drm_edid_to_speaker_allocation(radeon_connector_edid(connector), &sadb);
 121         if (sad_count <= 0) {
 122                 DRM_ERROR("Couldn't read Speaker Allocation Data Block: %d\n", sad_count);
 123                 return;
 124         }
 125
 126         /* program the speaker allocation */
 127         tmp = RREG32(AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER);
 128         tmp &= ~(DP_CONNECTION | SPEAKER_ALLOCATION_MASK);
 129         /* set HDMI mode */
 130         tmp |= HDMI_CONNECTION;
 131         if (sad_count)
 132                 tmp |= SPEAKER_ALLOCATION(sadb[0]);
 133         else
 134                 tmp |= SPEAKER_ALLOCATION(5); /* stereo */
 135         WREG32(AZ_F0_CODEC_PIN0_CONTROL_CHANNEL_SPEAKER, tmp);
 136
 137         kfree(sadb);
 138 }
 139
 140 static void evergreen_hdmi_write_sad_regs(struct drm_encoder *encoder)
 141 {
 142         struct radeon_device *rdev = encoder->dev->dev_private;
 143         struct drm_connector *connector;
 144         struct radeon_connector *radeon_connector = NULL;
 145         struct cea_sad *sads;
 146         int i, sad_count;
 147
 148         static const u16 eld_reg_to_type[][2] = {
 149                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR0, HDMI_AUDIO_CODING_TYPE_PCM },
 150                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR1, HDMI_AUDIO_CODING_TYPE_AC3 },
 151                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR2, HDMI_AUDIO_CODING_TYPE_MPEG1 },
 152                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR3, HDMI_AUDIO_CODING_TYPE_MP3 },
 153                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR4, HDMI_AUDIO_CODING_TYPE_MPEG2 },
 154                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR5, HDMI_AUDIO_CODING_TYPE_AAC_LC },
 155                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR6, HDMI_AUDIO_CODING_TYPE_DTS },
 156                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR7, HDMI_AUDIO_CODING_TYPE_ATRAC },
 157                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR9, HDMI_AUDIO_CODING_TYPE_EAC3 },
 158                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR10, HDMI_AUDIO_CODING_TYPE_DTS_HD },
 159                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR11, HDMI_AUDIO_CODING_TYPE_MLP },
 160                 { AZ_F0_CODEC_PIN0_CONTROL_AUDIO_DESCRIPTOR13, HDMI_AUDIO_CODING_TYPE_WMA_PRO },
 161         };
 162
 163         list_for_each_entry(connector, &encoder->dev->mode_config.connector_list, head) {
 164                 if (connector->encoder == encoder) {
 165                         radeon_connector = to_radeon_connector(connector);
 166                         break;
 167                 }
 168         }
 169
 170         if (!radeon_connector) {
 171                 DRM_ERROR("Couldn't find encoder's connector\n");
 172                 return;
 173         }
 174
 175         sad_count = drm_edid_to_sad(radeon_connector_edid(connector), &sads);
 176         if (sad_count <= 0) {
 177                 DRM_ERROR("Couldn't read SADs: %d\n", sad_count);
 178                 return;
 179         }
 180         BUG_ON(!sads);
 181
 182         for (i = 0; i < ARRAY_SIZE(eld_reg_to_type); i++) {
 183                 u32 value = 0;
 184                 u8 stereo_freqs = 0;
 185                 int max_channels = -1;
 186                 int j;
 187
 188                 for (j = 0; j < sad_count; j++) {
 189                         struct cea_sad *sad = &sads[j];
 190
 191                         if (sad->format == eld_reg_to_type[i][1]) {
 192                                 if (sad->channels > max_channels) {
 193                                         value = MAX_CHANNELS(sad->channels) |
 194                                                 DESCRIPTOR_BYTE_2(sad->byte2) |
 195                                                 SUPPORTED_FREQUENCIES(sad->freq);
 196                                         max_channels = sad->channels;
 197                                 }
 198
 199                                 if (sad->format == HDMI_AUDIO_CODING_TYPE_PCM)
 200                                         stereo_freqs |= sad->freq;
 201                                 else
 202                                         break;
 203                         }
 204                 }
 205
 206                 value |= SUPPORTED_FREQUENCIES_STEREO(stereo_freqs);
 207
 208                 WREG32(eld_reg_to_type[i][0], value);
 209         }
 210
 211         kfree(sads);
 212 }
 213
 214 /*
 215  * build a HDMI Video Info Frame
 216  */
 217 static void evergreen_hdmi_update_avi_infoframe(struct drm_encoder *encoder,
 218                                                 void *buffer, size_t size)
 219 {
 220         struct drm_device *dev = encoder->dev;
 221         struct radeon_device *rdev = dev->dev_private;
 222         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 223         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 224         uint32_t offset = dig->afmt->offset;
 225         uint8_t *frame = buffer + 3;
 226         uint8_t *header = buffer;
 227
 228         WREG32(AFMT_AVI_INFO0 + offset,
 229                 frame[0x0] | (frame[0x1] << 8) | (frame[0x2] << 16) | (frame[0x3] << 24));
 230         WREG32(AFMT_AVI_INFO1 + offset,
 231                 frame[0x4] | (frame[0x5] << 8) | (frame[0x6] << 16) | (frame[0x7] << 24));
 232         WREG32(AFMT_AVI_INFO2 + offset,
 233                 frame[0x8] | (frame[0x9] << 8) | (frame[0xA] << 16) | (frame[0xB] << 24));
 234         WREG32(AFMT_AVI_INFO3 + offset,
 235                 frame[0xC] | (frame[0xD] << 8) | (header[1] << 24));
 236 }
 237
 238 static void evergreen_audio_set_dto(struct drm_encoder *encoder, u32 clock)
 239 {
 240         struct drm_device *dev = encoder->dev;
 241         struct radeon_device *rdev = dev->dev_private;
 242         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 243         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 244         struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
 245         u32 base_rate = 24000;
 246         u32 max_ratio = clock / base_rate;
 247         u32 dto_phase;
 248         u32 dto_modulo = clock;
 249         u32 wallclock_ratio;
 250         u32 dto_cntl;
 251
 252         if (!dig || !dig->afmt)
 253                 return;
 254
 255         if (ASIC_IS_DCE6(rdev)) {
 256                 dto_phase = 24 * 1000;
 257         } else {
 258                 if (max_ratio >= 8) {
 259                         dto_phase = 192 * 1000;
 260                         wallclock_ratio = 3;
 261                 } else if (max_ratio >= 4) {
 262                         dto_phase = 96 * 1000;
 263                         wallclock_ratio = 2;
 264                 } else if (max_ratio >= 2) {
 265                         dto_phase = 48 * 1000;
 266                         wallclock_ratio = 1;
 267                 } else {
 268                         dto_phase = 24 * 1000;
 269                         wallclock_ratio = 0;
 270                 }
 271                 dto_cntl = RREG32(DCCG_AUDIO_DTO0_CNTL) & ~DCCG_AUDIO_DTO_WALLCLOCK_RATIO_MASK;
 272                 dto_cntl |= DCCG_AUDIO_DTO_WALLCLOCK_RATIO(wallclock_ratio);
 273                 WREG32(DCCG_AUDIO_DTO0_CNTL, dto_cntl);
 274         }
 275
 276         /* XXX two dtos; generally use dto0 for hdmi */
 277         /* Express [24MHz / target pixel clock] as an exact rational
 278          * number (coefficient of two integer numbers.  DCCG_AUDIO_DTOx_PHASE
 279          * is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
 280          */
 281         WREG32(DCCG_AUDIO_DTO_SOURCE, DCCG_AUDIO_DTO0_SOURCE_SEL(radeon_crtc->crtc_id));
 282         WREG32(DCCG_AUDIO_DTO0_PHASE, dto_phase);
 283         WREG32(DCCG_AUDIO_DTO0_MODULE, dto_modulo);
 284 }
 285
 286
 287 /*
 288  * update the info frames with the data from the current display mode
 289  */
 290 void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mode)
 291 {
 292         struct drm_device *dev = encoder->dev;
 293         struct radeon_device *rdev = dev->dev_private;
 294         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 295         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 296         struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);
 297         u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
 298         struct hdmi_avi_infoframe frame;
 299         uint32_t offset;
 300         ssize_t err;
 301         uint32_t val;
 302         int bpc = 8;
 303
 304         if (!dig || !dig->afmt)
 305                 return;
 306
 307         /* Silent, r600_hdmi_enable will raise WARN for us */
 308         if (!dig->afmt->enabled)
 309                 return;
 310         offset = dig->afmt->offset;
 311
 312         /* hdmi deep color mode general control packets setup, if bpc > 8 */
 313         if (encoder->crtc) {
 314                 struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
 315                 bpc = radeon_crtc->bpc;
 316         }
 317
 318         /* disable audio prior to setting up hw */
 319         if (ASIC_IS_DCE6(rdev)) {
 320                 dig->afmt->pin = dce6_audio_get_pin(rdev);
 321                 dce6_audio_enable(rdev, dig->afmt->pin, false);
 322         } else {
 323                 dig->afmt->pin = r600_audio_get_pin(rdev);
 324                 r600_audio_enable(rdev, dig->afmt->pin, false);
 325         }
 326
 327         evergreen_audio_set_dto(encoder, mode->clock);
 328
 329         WREG32(HDMI_VBI_PACKET_CONTROL + offset,
 330                HDMI_NULL_SEND); /* send null packets when required */
 331
 332         WREG32(AFMT_AUDIO_CRC_CONTROL + offset, 0x1000);
 333
 334         val = RREG32(HDMI_CONTROL + offset);
 335         val &= ~HDMI_DEEP_COLOR_ENABLE;
 336         val &= ~HDMI_DEEP_COLOR_DEPTH_MASK;
 337
 338         switch (bpc) {
 339                 case 0:
 340                 case 6:
 341                 case 8:
 342                 case 16:
 343                 default:
 344                         DRM_DEBUG("%s: Disabling hdmi deep color for %d bpc.\n",
 345                                          connector->name, bpc);
 346                         break;
 347                 case 10:
 348                         val |= HDMI_DEEP_COLOR_ENABLE;
 349                         val |= HDMI_DEEP_COLOR_DEPTH(HDMI_30BIT_DEEP_COLOR);
 350                         DRM_DEBUG("%s: Enabling hdmi deep color 30 for 10 bpc.\n",
 351                                          connector->name);
 352                         break;
 353                 case 12:
 354                         val |= HDMI_DEEP_COLOR_ENABLE;
 355                         val |= HDMI_DEEP_COLOR_DEPTH(HDMI_36BIT_DEEP_COLOR);
 356                         DRM_DEBUG("%s: Enabling hdmi deep color 36 for 12 bpc.\n",
 357                                          connector->name);
 358                         break;
 359         }
 360
 361         WREG32(HDMI_CONTROL + offset, val);
 362
 363         WREG32(HDMI_VBI_PACKET_CONTROL + offset,
 364                HDMI_NULL_SEND | /* send null packets when required */
 365                HDMI_GC_SEND | /* send general control packets */
 366                HDMI_GC_CONT); /* send general control packets every frame */
 367
 368         WREG32(HDMI_INFOFRAME_CONTROL0 + offset,
 369                HDMI_AUDIO_INFO_SEND | /* enable audio info frames (frames won't be set until audio is enabled) */
 370                HDMI_AUDIO_INFO_CONT); /* required for audio info values to be updated */
 371
 372         WREG32(AFMT_INFOFRAME_CONTROL0 + offset,
 373                AFMT_AUDIO_INFO_UPDATE); /* required for audio info values to be updated */
 374
 375         WREG32(HDMI_INFOFRAME_CONTROL1 + offset,
 376                HDMI_AUDIO_INFO_LINE(2)); /* anything other than 0 */
 377
 378         WREG32(HDMI_GC + offset, 0); /* unset HDMI_GC_AVMUTE */
 379
 380         WREG32(HDMI_AUDIO_PACKET_CONTROL + offset,
 381                HDMI_AUDIO_DELAY_EN(1) | /* set the default audio delay */
 382                HDMI_AUDIO_PACKETS_PER_LINE(3)); /* should be suffient for all audio modes and small enough for all hblanks */
 383
 384         WREG32(AFMT_AUDIO_PACKET_CONTROL + offset,
 385                AFMT_60958_CS_UPDATE); /* allow 60958 channel status fields to be updated */
 386
 387         /* fglrx clears sth in AFMT_AUDIO_PACKET_CONTROL2 here */
 388
 389         if (bpc > 8)
 390                 WREG32(HDMI_ACR_PACKET_CONTROL + offset,
 391                        HDMI_ACR_AUTO_SEND); /* allow hw to sent ACR packets when required */
 392         else
 393                 WREG32(HDMI_ACR_PACKET_CONTROL + offset,
 394                        HDMI_ACR_SOURCE | /* select SW CTS value */
 395                        HDMI_ACR_AUTO_SEND); /* allow hw to sent ACR packets when required */
 396
 397         evergreen_hdmi_update_ACR(encoder, mode->clock);
 398
 399         WREG32(AFMT_60958_0 + offset,
 400                AFMT_60958_CS_CHANNEL_NUMBER_L(1));
 401
 402         WREG32(AFMT_60958_1 + offset,
 403                AFMT_60958_CS_CHANNEL_NUMBER_R(2));
 404
 405         WREG32(AFMT_60958_2 + offset,
 406                AFMT_60958_CS_CHANNEL_NUMBER_2(3) |
 407                AFMT_60958_CS_CHANNEL_NUMBER_3(4) |
 408                AFMT_60958_CS_CHANNEL_NUMBER_4(5) |
 409                AFMT_60958_CS_CHANNEL_NUMBER_5(6) |
 410                AFMT_60958_CS_CHANNEL_NUMBER_6(7) |
 411                AFMT_60958_CS_CHANNEL_NUMBER_7(8));
 412
 413         if (ASIC_IS_DCE6(rdev)) {
 414                 dce6_afmt_write_speaker_allocation(encoder);
 415         } else {
 416                 dce4_afmt_write_speaker_allocation(encoder);
 417         }
 418
 419         WREG32(AFMT_AUDIO_PACKET_CONTROL2 + offset,
 420                AFMT_AUDIO_CHANNEL_ENABLE(0xff));
 421
 422         /* fglrx sets 0x40 in 0x5f80 here */
 423
 424         if (ASIC_IS_DCE6(rdev)) {
 425                 dce6_afmt_select_pin(encoder);
 426                 dce6_afmt_write_sad_regs(encoder);
 427                 dce6_afmt_write_latency_fields(encoder, mode);
 428         } else {
 429                 evergreen_hdmi_write_sad_regs(encoder);
 430                 dce4_afmt_write_latency_fields(encoder, mode);
 431         }
 432
 433         err = drm_hdmi_avi_infoframe_from_display_mode(&frame, mode);
 434         if (err < 0) {
 435                 DRM_ERROR("failed to setup AVI infoframe: %zd\n", err);
 436                 return;
 437         }
 438
 439         err = hdmi_avi_infoframe_pack(&frame, buffer, sizeof(buffer));
 440         if (err < 0) {
 441                 DRM_ERROR("failed to pack AVI infoframe: %zd\n", err);
 442                 return;
 443         }
 444
 445         evergreen_hdmi_update_avi_infoframe(encoder, buffer, sizeof(buffer));
 446
 447         WREG32_OR(HDMI_INFOFRAME_CONTROL0 + offset,
 448                   HDMI_AVI_INFO_SEND | /* enable AVI info frames */
 449                   HDMI_AVI_INFO_CONT); /* required for audio info values to be updated */
 450
 451         WREG32_P(HDMI_INFOFRAME_CONTROL1 + offset,
 452                  HDMI_AVI_INFO_LINE(2), /* anything other than 0 */
 453                  ~HDMI_AVI_INFO_LINE_MASK);
 454
 455         WREG32_OR(AFMT_AUDIO_PACKET_CONTROL + offset,
 456                   AFMT_AUDIO_SAMPLE_SEND); /* send audio packets */
 457
 458         /* it's unknown what these bits do excatly, but it's indeed quite useful for debugging */
 459         WREG32(AFMT_RAMP_CONTROL0 + offset, 0x00FFFFFF);
 460         WREG32(AFMT_RAMP_CONTROL1 + offset, 0x007FFFFF);
 461         WREG32(AFMT_RAMP_CONTROL2 + offset, 0x00000001);
 462         WREG32(AFMT_RAMP_CONTROL3 + offset, 0x00000001);
 463
 464         /* enable audio after to setting up hw */
 465         if (ASIC_IS_DCE6(rdev))
 466                 dce6_audio_enable(rdev, dig->afmt->pin, true);
 467         else
 468                 r600_audio_enable(rdev, dig->afmt->pin, true);
 469 }
 470
 471 void evergreen_hdmi_enable(struct drm_encoder *encoder, bool enable)
 472 {
 473         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
 474         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
 475
 476         if (!dig || !dig->afmt)
 477                 return;
 478
 479         /* Silent, r600_hdmi_enable will raise WARN for us */
 480         if (enable && dig->afmt->enabled)
 481                 return;
 482         if (!enable && !dig->afmt->enabled)
 483                 return;
 484
 485         dig->afmt->enabled = enable;
 486
 487         DRM_DEBUG("%sabling HDMI interface @ 0x%04X for encoder 0x%x\n",
 488                   enable ? "En" : "Dis", dig->afmt->offset, radeon_encoder->encoder_id);
 489 }