drivers/gpu/drm/i915/intel_audio.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/component.h>
  26 #include <drm/i915_component.h>
  27 #include "intel_drv.h"
  28
  29 #include <drm/drmP.h>
  30 #include <drm/drm_edid.h>
  31 #include "i915_drv.h"
  32
  33 /**
  34  * DOC: High Definition Audio over HDMI and Display Port
  35  *
  36  * The graphics and audio drivers together support High Definition Audio over
  37  * HDMI and Display Port. The audio programming sequences are divided into audio
  38  * codec and controller enable and disable sequences. The graphics driver
  39  * handles the audio codec sequences, while the audio driver handles the audio
  40  * controller sequences.
  41  *
  42  * The disable sequences must be performed before disabling the transcoder or
  43  * port. The enable sequences may only be performed after enabling the
  44  * transcoder and port, and after completed link training.
  45  *
  46  * The codec and controller sequences could be done either parallel or serial,
  47  * but generally the ELDV/PD change in the codec sequence indicates to the audio
  48  * driver that the controller sequence should start. Indeed, most of the
  49  * co-operation between the graphics and audio drivers is handled via audio
  50  * related registers. (The notable exception is the power management, not
  51  * covered here.)
  52  */
  53
  54 static const struct {
  55         int clock;
  56         u32 config;
  57 } hdmi_audio_clock[] = {
  58         { DIV_ROUND_UP(25200 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_25175 },
  59         { 25200, AUD_CONFIG_PIXEL_CLOCK_HDMI_25200 }, /* default per bspec */
  60         { 27000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27000 },
  61         { 27000 * 1001 / 1000, AUD_CONFIG_PIXEL_CLOCK_HDMI_27027 },
  62         { 54000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54000 },
  63         { 54000 * 1001 / 1000, AUD_CONFIG_PIXEL_CLOCK_HDMI_54054 },
  64         { DIV_ROUND_UP(74250 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_74176 },
  65         { 74250, AUD_CONFIG_PIXEL_CLOCK_HDMI_74250 },
  66         { DIV_ROUND_UP(148500 * 1000, 1001), AUD_CONFIG_PIXEL_CLOCK_HDMI_148352 },
  67         { 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
  68 };
  69
  70 /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
  71 static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
  72 {
  73         int i;
  74
  75         for (i = 0; i < ARRAY_SIZE(hdmi_audio_clock); i++) {
  76                 if (mode->clock == hdmi_audio_clock[i].clock)
  77                         break;
  78         }
  79
  80         if (i == ARRAY_SIZE(hdmi_audio_clock)) {
  81                 DRM_DEBUG_KMS("HDMI audio pixel clock setting for %d not found, falling back to defaults\n", mode->clock);
  82                 i = 1;
  83         }
  84
  85         DRM_DEBUG_KMS("Configuring HDMI audio for pixel clock %d (0x%08x)\n",
  86                       hdmi_audio_clock[i].clock,
  87                       hdmi_audio_clock[i].config);
  88
  89         return hdmi_audio_clock[i].config;
  90 }
  91
  92 static bool intel_eld_uptodate(struct drm_connector *connector,
  93                                int reg_eldv, uint32_t bits_eldv,
  94                                int reg_elda, uint32_t bits_elda,
  95                                int reg_edid)
  96 {
  97         struct drm_i915_private *dev_priv = connector->dev->dev_private;
  98         uint8_t *eld = connector->eld;
  99         uint32_t tmp;
 100         int i;
 101
 102         tmp = I915_READ(reg_eldv);
 103         tmp &= bits_eldv;
 104
 105         if (!tmp)
 106                 return false;
 107
 108         tmp = I915_READ(reg_elda);
 109         tmp &= ~bits_elda;
 110         I915_WRITE(reg_elda, tmp);
 111
 112         for (i = 0; i < drm_eld_size(eld) / 4; i++)
 113                 if (I915_READ(reg_edid) != *((uint32_t *)eld + i))
 114                         return false;
 115
 116         return true;
 117 }
 118
 119 static void g4x_audio_codec_disable(struct intel_encoder *encoder)
 120 {
 121         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 122         uint32_t eldv, tmp;
 123
 124         DRM_DEBUG_KMS("Disable audio codec\n");
 125
 126         tmp = I915_READ(G4X_AUD_VID_DID);
 127         if (tmp == INTEL_AUDIO_DEVBLC || tmp == INTEL_AUDIO_DEVCL)
 128                 eldv = G4X_ELDV_DEVCL_DEVBLC;
 129         else
 130                 eldv = G4X_ELDV_DEVCTG;
 131
 132         /* Invalidate ELD */
 133         tmp = I915_READ(G4X_AUD_CNTL_ST);
 134         tmp &= ~eldv;
 135         I915_WRITE(G4X_AUD_CNTL_ST, tmp);
 136 }
 137
 138 static void g4x_audio_codec_enable(struct drm_connector *connector,
 139                                    struct intel_encoder *encoder,
 140                                    struct drm_display_mode *mode)
 141 {
 142         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 143         uint8_t *eld = connector->eld;
 144         uint32_t eldv;
 145         uint32_t tmp;
 146         int len, i;
 147
 148         DRM_DEBUG_KMS("Enable audio codec, %u bytes ELD\n", eld[2]);
 149
 150         tmp = I915_READ(G4X_AUD_VID_DID);
 151         if (tmp == INTEL_AUDIO_DEVBLC || tmp == INTEL_AUDIO_DEVCL)
 152                 eldv = G4X_ELDV_DEVCL_DEVBLC;
 153         else
 154                 eldv = G4X_ELDV_DEVCTG;
 155
 156         if (intel_eld_uptodate(connector,
 157                                G4X_AUD_CNTL_ST, eldv,
 158                                G4X_AUD_CNTL_ST, G4X_ELD_ADDR_MASK,
 159                                G4X_HDMIW_HDMIEDID))
 160                 return;
 161
 162         tmp = I915_READ(G4X_AUD_CNTL_ST);
 163         tmp &= ~(eldv | G4X_ELD_ADDR_MASK);
 164         len = (tmp >> 9) & 0x1f;                /* ELD buffer size */
 165         I915_WRITE(G4X_AUD_CNTL_ST, tmp);
 166
 167         len = min(drm_eld_size(eld) / 4, len);
 168         DRM_DEBUG_DRIVER("ELD size %d\n", len);
 169         for (i = 0; i < len; i++)
 170                 I915_WRITE(G4X_HDMIW_HDMIEDID, *((uint32_t *)eld + i));
 171
 172         tmp = I915_READ(G4X_AUD_CNTL_ST);
 173         tmp |= eldv;
 174         I915_WRITE(G4X_AUD_CNTL_ST, tmp);
 175 }
 176
 177 static void hsw_audio_codec_disable(struct intel_encoder *encoder)
 178 {
 179         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 180         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 181         enum pipe pipe = intel_crtc->pipe;
 182         uint32_t tmp;
 183
 184         DRM_DEBUG_KMS("Disable audio codec on pipe %c\n", pipe_name(pipe));
 185
 186         /* Disable timestamps */
 187         tmp = I915_READ(HSW_AUD_CFG(pipe));
 188         tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
 189         tmp |= AUD_CONFIG_N_PROG_ENABLE;
 190         tmp &= ~AUD_CONFIG_UPPER_N_MASK;
 191         tmp &= ~AUD_CONFIG_LOWER_N_MASK;
 192         if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
 193                 tmp |= AUD_CONFIG_N_VALUE_INDEX;
 194         I915_WRITE(HSW_AUD_CFG(pipe), tmp);
 195
 196         /* Invalidate ELD */
 197         tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 198         tmp &= ~AUDIO_ELD_VALID(pipe);
 199         tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
 200         I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
 201 }
 202
 203 static void hsw_audio_codec_enable(struct drm_connector *connector,
 204                                    struct intel_encoder *encoder,
 205                                    struct drm_display_mode *mode)
 206 {
 207         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 208         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 209         enum pipe pipe = intel_crtc->pipe;
 210         const uint8_t *eld = connector->eld;
 211         uint32_t tmp;
 212         int len, i;
 213
 214         DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
 215                       pipe_name(pipe), drm_eld_size(eld));
 216
 217         /* Enable audio presence detect, invalidate ELD */
 218         tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 219         tmp |= AUDIO_OUTPUT_ENABLE(pipe);
 220         tmp &= ~AUDIO_ELD_VALID(pipe);
 221         I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
 222
 223         /*
 224          * FIXME: We're supposed to wait for vblank here, but we have vblanks
 225          * disabled during the mode set. The proper fix would be to push the
 226          * rest of the setup into a vblank work item, queued here, but the
 227          * infrastructure is not there yet.
 228          */
 229
 230         /* Reset ELD write address */
 231         tmp = I915_READ(HSW_AUD_DIP_ELD_CTRL(pipe));
 232         tmp &= ~IBX_ELD_ADDRESS_MASK;
 233         I915_WRITE(HSW_AUD_DIP_ELD_CTRL(pipe), tmp);
 234
 235         /* Up to 84 bytes of hw ELD buffer */
 236         len = min(drm_eld_size(eld), 84);
 237         for (i = 0; i < len / 4; i++)
 238                 I915_WRITE(HSW_AUD_EDID_DATA(pipe), *((uint32_t *)eld + i));
 239
 240         /* ELD valid */
 241         tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 242         tmp |= AUDIO_ELD_VALID(pipe);
 243         I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
 244
 245         /* Enable timestamps */
 246         tmp = I915_READ(HSW_AUD_CFG(pipe));
 247         tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
 248         tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
 249         tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
 250         if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
 251                 tmp |= AUD_CONFIG_N_VALUE_INDEX;
 252         else
 253                 tmp |= audio_config_hdmi_pixel_clock(mode);
 254         I915_WRITE(HSW_AUD_CFG(pipe), tmp);
 255 }
 256
 257 static void ilk_audio_codec_disable(struct intel_encoder *encoder)
 258 {
 259         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 260         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 261         struct intel_digital_port *intel_dig_port =
 262                 enc_to_dig_port(&encoder->base);
 263         enum port port = intel_dig_port->port;
 264         enum pipe pipe = intel_crtc->pipe;
 265         uint32_t tmp, eldv;
 266         int aud_config;
 267         int aud_cntrl_st2;
 268
 269         DRM_DEBUG_KMS("Disable audio codec on port %c, pipe %c\n",
 270                       port_name(port), pipe_name(pipe));
 271
 272         if (WARN_ON(port == PORT_A))
 273                 return;
 274
 275         if (HAS_PCH_IBX(dev_priv->dev)) {
 276                 aud_config = IBX_AUD_CFG(pipe);
 277                 aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
 278         } else if (IS_VALLEYVIEW(dev_priv)) {
 279                 aud_config = VLV_AUD_CFG(pipe);
 280                 aud_cntrl_st2 = VLV_AUD_CNTL_ST2;
 281         } else {
 282                 aud_config = CPT_AUD_CFG(pipe);
 283                 aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
 284         }
 285
 286         /* Disable timestamps */
 287         tmp = I915_READ(aud_config);
 288         tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
 289         tmp |= AUD_CONFIG_N_PROG_ENABLE;
 290         tmp &= ~AUD_CONFIG_UPPER_N_MASK;
 291         tmp &= ~AUD_CONFIG_LOWER_N_MASK;
 292         if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
 293                 tmp |= AUD_CONFIG_N_VALUE_INDEX;
 294         I915_WRITE(aud_config, tmp);
 295
 296         eldv = IBX_ELD_VALID(port);
 297
 298         /* Invalidate ELD */
 299         tmp = I915_READ(aud_cntrl_st2);
 300         tmp &= ~eldv;
 301         I915_WRITE(aud_cntrl_st2, tmp);
 302 }
 303
 304 static void ilk_audio_codec_enable(struct drm_connector *connector,
 305                                    struct intel_encoder *encoder,
 306                                    struct drm_display_mode *mode)
 307 {
 308         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 309         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
 310         struct intel_digital_port *intel_dig_port =
 311                 enc_to_dig_port(&encoder->base);
 312         enum port port = intel_dig_port->port;
 313         enum pipe pipe = intel_crtc->pipe;
 314         uint8_t *eld = connector->eld;
 315         uint32_t eldv;
 316         uint32_t tmp;
 317         int len, i;
 318         int hdmiw_hdmiedid;
 319         int aud_config;
 320         int aud_cntl_st;
 321         int aud_cntrl_st2;
 322
 323         DRM_DEBUG_KMS("Enable audio codec on port %c, pipe %c, %u bytes ELD\n",
 324                       port_name(port), pipe_name(pipe), drm_eld_size(eld));
 325
 326         if (WARN_ON(port == PORT_A))
 327                 return;
 328
 329         /*
 330          * FIXME: We're supposed to wait for vblank here, but we have vblanks
 331          * disabled during the mode set. The proper fix would be to push the
 332          * rest of the setup into a vblank work item, queued here, but the
 333          * infrastructure is not there yet.
 334          */
 335
 336         if (HAS_PCH_IBX(connector->dev)) {
 337                 hdmiw_hdmiedid = IBX_HDMIW_HDMIEDID(pipe);
 338                 aud_config = IBX_AUD_CFG(pipe);
 339                 aud_cntl_st = IBX_AUD_CNTL_ST(pipe);
 340                 aud_cntrl_st2 = IBX_AUD_CNTL_ST2;
 341         } else if (IS_VALLEYVIEW(connector->dev)) {
 342                 hdmiw_hdmiedid = VLV_HDMIW_HDMIEDID(pipe);
 343                 aud_config = VLV_AUD_CFG(pipe);
 344                 aud_cntl_st = VLV_AUD_CNTL_ST(pipe);
 345                 aud_cntrl_st2 = VLV_AUD_CNTL_ST2;
 346         } else {
 347                 hdmiw_hdmiedid = CPT_HDMIW_HDMIEDID(pipe);
 348                 aud_config = CPT_AUD_CFG(pipe);
 349                 aud_cntl_st = CPT_AUD_CNTL_ST(pipe);
 350                 aud_cntrl_st2 = CPT_AUD_CNTRL_ST2;
 351         }
 352
 353         eldv = IBX_ELD_VALID(port);
 354
 355         /* Invalidate ELD */
 356         tmp = I915_READ(aud_cntrl_st2);
 357         tmp &= ~eldv;
 358         I915_WRITE(aud_cntrl_st2, tmp);
 359
 360         /* Reset ELD write address */
 361         tmp = I915_READ(aud_cntl_st);
 362         tmp &= ~IBX_ELD_ADDRESS_MASK;
 363         I915_WRITE(aud_cntl_st, tmp);
 364
 365         /* Up to 84 bytes of hw ELD buffer */
 366         len = min(drm_eld_size(eld), 84);
 367         for (i = 0; i < len / 4; i++)
 368                 I915_WRITE(hdmiw_hdmiedid, *((uint32_t *)eld + i));
 369
 370         /* ELD valid */
 371         tmp = I915_READ(aud_cntrl_st2);
 372         tmp |= eldv;
 373         I915_WRITE(aud_cntrl_st2, tmp);
 374
 375         /* Enable timestamps */
 376         tmp = I915_READ(aud_config);
 377         tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
 378         tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
 379         tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
 380         if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
 381                 tmp |= AUD_CONFIG_N_VALUE_INDEX;
 382         else
 383                 tmp |= audio_config_hdmi_pixel_clock(mode);
 384         I915_WRITE(aud_config, tmp);
 385 }
 386
 387 /**
 388  * intel_audio_codec_enable - Enable the audio codec for HD audio
 389  * @intel_encoder: encoder on which to enable audio
 390  *
 391  * The enable sequences may only be performed after enabling the transcoder and
 392  * port, and after completed link training.
 393  */
 394 void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
 395 {
 396         struct drm_encoder *encoder = &intel_encoder->base;
 397         struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
 398         struct drm_display_mode *mode = &crtc->config->base.adjusted_mode;
 399         struct drm_connector *connector;
 400         struct drm_device *dev = encoder->dev;
 401         struct drm_i915_private *dev_priv = dev->dev_private;
 402
 403         connector = drm_select_eld(encoder, mode);
 404         if (!connector)
 405                 return;
 406
 407         DRM_DEBUG_DRIVER("ELD on [CONNECTOR:%d:%s], [ENCODER:%d:%s]\n",
 408                          connector->base.id,
 409                          connector->name,
 410                          connector->encoder->base.id,
 411                          connector->encoder->name);
 412
 413         /* ELD Conn_Type */
 414         connector->eld[5] &= ~(3 << 2);
 415         if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT))
 416                 connector->eld[5] |= (1 << 2);
 417
 418         connector->eld[6] = drm_av_sync_delay(connector, mode) / 2;
 419
 420         if (dev_priv->display.audio_codec_enable)
 421                 dev_priv->display.audio_codec_enable(connector, intel_encoder, mode);
 422 }
 423
 424 /**
 425  * intel_audio_codec_disable - Disable the audio codec for HD audio
 426  * @encoder: encoder on which to disable audio
 427  *
 428  * The disable sequences must be performed before disabling the transcoder or
 429  * port.
 430  */
 431 void intel_audio_codec_disable(struct intel_encoder *encoder)
 432 {
 433         struct drm_device *dev = encoder->base.dev;
 434         struct drm_i915_private *dev_priv = dev->dev_private;
 435
 436         if (dev_priv->display.audio_codec_disable)
 437                 dev_priv->display.audio_codec_disable(encoder);
 438 }
 439
 440 /**
 441  * intel_init_audio - Set up chip specific audio functions
 442  * @dev: drm device
 443  */
 444 void intel_init_audio(struct drm_device *dev)
 445 {
 446         struct drm_i915_private *dev_priv = dev->dev_private;
 447
 448         if (IS_G4X(dev)) {
 449                 dev_priv->display.audio_codec_enable = g4x_audio_codec_enable;
 450                 dev_priv->display.audio_codec_disable = g4x_audio_codec_disable;
 451         } else if (IS_VALLEYVIEW(dev)) {
 452                 dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
 453                 dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
 454         } else if (IS_HASWELL(dev) || INTEL_INFO(dev)->gen >= 8) {
 455                 dev_priv->display.audio_codec_enable = hsw_audio_codec_enable;
 456                 dev_priv->display.audio_codec_disable = hsw_audio_codec_disable;
 457         } else if (HAS_PCH_SPLIT(dev)) {
 458                 dev_priv->display.audio_codec_enable = ilk_audio_codec_enable;
 459                 dev_priv->display.audio_codec_disable = ilk_audio_codec_disable;
 460         }
 461 }
 462
 463 static void i915_audio_component_get_power(struct device *dev)
 464 {
 465         intel_display_power_get(dev_to_i915(dev), POWER_DOMAIN_AUDIO);
 466 }
 467
 468 static void i915_audio_component_put_power(struct device *dev)
 469 {
 470         intel_display_power_put(dev_to_i915(dev), POWER_DOMAIN_AUDIO);
 471 }
 472
 473 static void i915_audio_component_codec_wake_override(struct device *dev,
 474                                                      bool enable)
 475 {
 476         struct drm_i915_private *dev_priv = dev_to_i915(dev);
 477         u32 tmp;
 478
 479         if (!IS_SKYLAKE(dev_priv))
 480                 return;
 481
 482         /*
 483          * Enable/disable generating the codec wake signal, overriding the
 484          * internal logic to generate the codec wake to controller.
 485          */
 486         tmp = I915_READ(HSW_AUD_CHICKENBIT);
 487         tmp &= ~SKL_AUD_CODEC_WAKE_SIGNAL;
 488         I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
 489         usleep_range(1000, 1500);
 490
 491         if (enable) {
 492                 tmp = I915_READ(HSW_AUD_CHICKENBIT);
 493                 tmp |= SKL_AUD_CODEC_WAKE_SIGNAL;
 494                 I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
 495                 usleep_range(1000, 1500);
 496         }
 497 }
 498
 499 /* Get CDCLK in kHz  */
 500 static int i915_audio_component_get_cdclk_freq(struct device *dev)
 501 {
 502         struct drm_i915_private *dev_priv = dev_to_i915(dev);
 503         int ret;
 504
 505         if (WARN_ON_ONCE(!HAS_DDI(dev_priv)))
 506                 return -ENODEV;
 507
 508         intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
 509         ret = dev_priv->display.get_display_clock_speed(dev_priv->dev);
 510
 511         intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
 512
 513         return ret;
 514 }
 515
 516 static const struct i915_audio_component_ops i915_audio_component_ops = {
 517         .owner          = THIS_MODULE,
 518         .get_power      = i915_audio_component_get_power,
 519         .put_power      = i915_audio_component_put_power,
 520         .codec_wake_override = i915_audio_component_codec_wake_override,
 521         .get_cdclk_freq = i915_audio_component_get_cdclk_freq,
 522 };
 523
 524 static int i915_audio_component_bind(struct device *i915_dev,
 525                                      struct device *hda_dev, void *data)
 526 {
 527         struct i915_audio_component *acomp = data;
 528
 529         if (WARN_ON(acomp->ops || acomp->dev))
 530                 return -EEXIST;
 531
 532         acomp->ops = &i915_audio_component_ops;
 533         acomp->dev = i915_dev;
 534
 535         return 0;
 536 }
 537
 538 static void i915_audio_component_unbind(struct device *i915_dev,
 539                                         struct device *hda_dev, void *data)
 540 {
 541         struct i915_audio_component *acomp = data;
 542
 543         acomp->ops = NULL;
 544         acomp->dev = NULL;
 545 }
 546
 547 static const struct component_ops i915_audio_component_bind_ops = {
 548         .bind   = i915_audio_component_bind,
 549         .unbind = i915_audio_component_unbind,
 550 };
 551
 552 /**
 553  * i915_audio_component_init - initialize and register the audio component
 554  * @dev_priv: i915 device instance
 555  *
 556  * This will register with the component framework a child component which
 557  * will bind dynamically to the snd_hda_intel driver's corresponding master
 558  * component when the latter is registered. During binding the child
 559  * initializes an instance of struct i915_audio_component which it receives
 560  * from the master. The master can then start to use the interface defined by
 561  * this struct. Each side can break the binding at any point by deregistering
 562  * its own component after which each side's component unbind callback is
 563  * called.
 564  *
 565  * We ignore any error during registration and continue with reduced
 566  * functionality (i.e. without HDMI audio).
 567  */
 568 void i915_audio_component_init(struct drm_i915_private *dev_priv)
 569 {
 570         int ret;
 571
 572         ret = component_add(dev_priv->dev->dev, &i915_audio_component_bind_ops);
 573         if (ret < 0) {
 574                 DRM_ERROR("failed to add audio component (%d)\n", ret);
 575                 /* continue with reduced functionality */
 576                 return;
 577         }
 578
 579         dev_priv->audio_component_registered = true;
 580 }
 581
 582 /**
 583  * i915_audio_component_cleanup - deregister the audio component
 584  * @dev_priv: i915 device instance
 585  *
 586  * Deregisters the audio component, breaking any existing binding to the
 587  * corresponding snd_hda_intel driver's master component.
 588  */
 589 void i915_audio_component_cleanup(struct drm_i915_private *dev_priv)
 590 {
 591         if (!dev_priv->audio_component_registered)
 592                 return;
 593
 594         component_del(dev_priv->dev->dev, &i915_audio_component_bind_ops);
 595         dev_priv->audio_component_registered = false;
 596 }