sound/hda/hdac_i915.c

   1 /*
   2  *  hdac_i915.c - routines for sync between HD-A core and i915 display driver
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under the terms of the GNU General Public License as published by the Free
   6  *  Software Foundation; either version 2 of the License, or (at your option)
   7  *  any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful, but
  10  *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/component.h>
  19 #include <drm/i915_component.h>
  20 #include <sound/core.h>
  21 #include <sound/hdaudio.h>
  22 #include <sound/hda_i915.h>
  23 #include <sound/hda_register.h>
  24
  25 static struct i915_audio_component *hdac_acomp;
  26
  27 /**
  28  * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
  29  * @bus: HDA core bus
  30  * @enable: enable or disable the wakeup
  31  *
  32  * This function is supposed to be used only by a HD-audio controller
  33  * driver that needs the interaction with i915 graphics.
  34  *
  35  * This function should be called during the chip reset, also called at
  36  * resume for updating STATESTS register read.
  37  *
  38  * Returns zero for success or a negative error code.
  39  */
  40 int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
  41 {
  42         struct i915_audio_component *acomp = bus->audio_component;
  43
  44         if (!acomp || !acomp->ops)
  45                 return -ENODEV;
  46
  47         if (!acomp->ops->codec_wake_override) {
  48                 dev_warn(bus->dev,
  49                         "Invalid codec wake callback\n");
  50                 return 0;
  51         }
  52
  53         dev_dbg(bus->dev, "%s codec wakeup\n",
  54                 enable ? "enable" : "disable");
  55
  56         acomp->ops->codec_wake_override(acomp->dev, enable);
  57
  58         return 0;
  59 }
  60 EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
  61
  62 /**
  63  * snd_hdac_display_power - Power up / down the power refcount
  64  * @bus: HDA core bus
  65  * @enable: power up or down
  66  *
  67  * This function is supposed to be used only by a HD-audio controller
  68  * driver that needs the interaction with i915 graphics.
  69  *
  70  * This function manages a refcount and calls the i915 get_power() and
  71  * put_power() ops accordingly, toggling the codec wakeup, too.
  72  *
  73  * Returns zero for success or a negative error code.
  74  */
  75 int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
  76 {
  77         struct i915_audio_component *acomp = bus->audio_component;
  78
  79         if (!acomp || !acomp->ops)
  80                 return -ENODEV;
  81
  82         dev_dbg(bus->dev, "display power %s\n",
  83                 enable ? "enable" : "disable");
  84
  85         if (enable) {
  86                 if (!bus->i915_power_refcount++) {
  87                         acomp->ops->get_power(acomp->dev);
  88                         snd_hdac_set_codec_wakeup(bus, true);
  89                         snd_hdac_set_codec_wakeup(bus, false);
  90                 }
  91         } else {
  92                 WARN_ON(!bus->i915_power_refcount);
  93                 if (!--bus->i915_power_refcount)
  94                         acomp->ops->put_power(acomp->dev);
  95         }
  96
  97         return 0;
  98 }
  99 EXPORT_SYMBOL_GPL(snd_hdac_display_power);
 100
 101 #define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \
 102                                 ((pci)->device == 0x0c0c) || \
 103                                 ((pci)->device == 0x0d0c) || \
 104                                 ((pci)->device == 0x160c))
 105
 106 /**
 107  * snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
 108  * @bus: HDA core bus
 109  *
 110  * Intel HSW/BDW display HDA controller is in GPU. Both its power and link BCLK
 111  * depends on GPU. Two Extended Mode registers EM4 (M value) and EM5 (N Value)
 112  * are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
 113  * BCLK = CDCLK * M / N
 114  * The values will be lost when the display power well is disabled and need to
 115  * be restored to avoid abnormal playback speed.
 116  *
 117  * Call this function at initializing and changing power well, as well as
 118  * at ELD notifier for the hotplug.
 119  */
 120 void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
 121 {
 122         struct i915_audio_component *acomp = bus->audio_component;
 123         struct pci_dev *pci = to_pci_dev(bus->dev);
 124         int cdclk_freq;
 125         unsigned int bclk_m, bclk_n;
 126
 127         if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq)
 128                 return; /* only for i915 binding */
 129         if (!CONTROLLER_IN_GPU(pci))
 130                 return; /* only HSW/BDW */
 131
 132         cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
 133         switch (cdclk_freq) {
 134         case 337500:
 135                 bclk_m = 16;
 136                 bclk_n = 225;
 137                 break;
 138
 139         case 450000:
 140         default: /* default CDCLK 450MHz */
 141                 bclk_m = 4;
 142                 bclk_n = 75;
 143                 break;
 144
 145         case 540000:
 146                 bclk_m = 4;
 147                 bclk_n = 90;
 148                 break;
 149
 150         case 675000:
 151                 bclk_m = 8;
 152                 bclk_n = 225;
 153                 break;
 154         }
 155
 156         snd_hdac_chip_writew(bus, HSW_EM4, bclk_m);
 157         snd_hdac_chip_writew(bus, HSW_EM5, bclk_n);
 158 }
 159 EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
 160
 161 /* There is a fixed mapping between audio pin node and display port.
 162  * on SNB, IVY, HSW, BSW, SKL, BXT, KBL:
 163  * Pin Widget 5 - PORT B (port = 1 in i915 driver)
 164  * Pin Widget 6 - PORT C (port = 2 in i915 driver)
 165  * Pin Widget 7 - PORT D (port = 3 in i915 driver)
 166  *
 167  * on VLV, ILK:
 168  * Pin Widget 4 - PORT B (port = 1 in i915 driver)
 169  * Pin Widget 5 - PORT C (port = 2 in i915 driver)
 170  * Pin Widget 6 - PORT D (port = 3 in i915 driver)
 171  */
 172 static int pin2port(struct hdac_device *codec, hda_nid_t pin_nid)
 173 {
 174         int base_nid;
 175
 176         switch (codec->vendor_id) {
 177         case 0x80860054: /* ILK */
 178         case 0x80862804: /* ILK */
 179         case 0x80862882: /* VLV */
 180                 base_nid = 3;
 181                 break;
 182         default:
 183                 base_nid = 4;
 184                 break;
 185         }
 186
 187         if (WARN_ON(pin_nid <= base_nid || pin_nid > base_nid + 3))
 188                 return -1;
 189         return pin_nid - base_nid;
 190 }
 191
 192 /**
 193  * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
 194  * @codec: HDA codec
 195  * @nid: the pin widget NID
 196  * @dev_id: device identifier
 197  * @rate: the sample rate to set
 198  *
 199  * This function is supposed to be used only by a HD-audio controller
 200  * driver that needs the interaction with i915 graphics.
 201  *
 202  * This function sets N/CTS value based on the given sample rate.
 203  * Returns zero for success, or a negative error code.
 204  */
 205 int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
 206                              int dev_id, int rate)
 207 {
 208         struct hdac_bus *bus = codec->bus;
 209         struct i915_audio_component *acomp = bus->audio_component;
 210         int port, pipe;
 211
 212         if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
 213                 return -ENODEV;
 214         port = pin2port(codec, nid);
 215         if (port < 0)
 216                 return -EINVAL;
 217         pipe = dev_id;
 218         return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);
 219 }
 220 EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
 221
 222 /**
 223  * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
 224  * @codec: HDA codec
 225  * @nid: the pin widget NID
 226  * @dev_id: device identifier
 227  * @audio_enabled: the pointer to store the current audio state
 228  * @buffer: the buffer pointer to store ELD bytes
 229  * @max_bytes: the max bytes to be stored on @buffer
 230  *
 231  * This function is supposed to be used only by a HD-audio controller
 232  * driver that needs the interaction with i915 graphics.
 233  *
 234  * This function queries the current state of the audio on the given
 235  * digital port and fetches the ELD bytes onto the given buffer.
 236  * It returns the number of bytes for the total ELD data, zero for
 237  * invalid ELD, or a negative error code.
 238  *
 239  * The return size is the total bytes required for the whole ELD bytes,
 240  * thus it may be over @max_bytes.  If it's over @max_bytes, it implies
 241  * that only a part of ELD bytes have been fetched.
 242  */
 243 int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
 244                            bool *audio_enabled, char *buffer, int max_bytes)
 245 {
 246         struct hdac_bus *bus = codec->bus;
 247         struct i915_audio_component *acomp = bus->audio_component;
 248         int port, pipe;
 249
 250         if (!acomp || !acomp->ops || !acomp->ops->get_eld)
 251                 return -ENODEV;
 252
 253         port = pin2port(codec, nid);
 254         if (port < 0)
 255                 return -EINVAL;
 256
 257         pipe = dev_id;
 258         return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled,
 259                                    buffer, max_bytes);
 260 }
 261 EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
 262
 263 static int hdac_component_master_bind(struct device *dev)
 264 {
 265         struct i915_audio_component *acomp = hdac_acomp;
 266         int ret;
 267
 268         ret = component_bind_all(dev, acomp);
 269         if (ret < 0)
 270                 return ret;
 271
 272         if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
 273                       acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
 274                 ret = -EINVAL;
 275                 goto out_unbind;
 276         }
 277
 278         /*
 279          * Atm, we don't support dynamic unbinding initiated by the child
 280          * component, so pin its containing module until we unbind.
 281          */
 282         if (!try_module_get(acomp->ops->owner)) {
 283                 ret = -ENODEV;
 284                 goto out_unbind;
 285         }
 286
 287         return 0;
 288
 289 out_unbind:
 290         component_unbind_all(dev, acomp);
 291
 292         return ret;
 293 }
 294
 295 static void hdac_component_master_unbind(struct device *dev)
 296 {
 297         struct i915_audio_component *acomp = hdac_acomp;
 298
 299         module_put(acomp->ops->owner);
 300         component_unbind_all(dev, acomp);
 301         WARN_ON(acomp->ops || acomp->dev);
 302 }
 303
 304 static const struct component_master_ops hdac_component_master_ops = {
 305         .bind = hdac_component_master_bind,
 306         .unbind = hdac_component_master_unbind,
 307 };
 308
 309 static int hdac_component_master_match(struct device *dev, void *data)
 310 {
 311         /* i915 is the only supported component */
 312         return !strcmp(dev->driver->name, "i915");
 313 }
 314
 315 /**
 316  * snd_hdac_i915_register_notifier - Register i915 audio component ops
 317  * @aops: i915 audio component ops
 318  *
 319  * This function is supposed to be used only by a HD-audio controller
 320  * driver that needs the interaction with i915 graphics.
 321  *
 322  * This function sets the given ops to be called by the i915 graphics driver.
 323  *
 324  * Returns zero for success or a negative error code.
 325  */
 326 int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
 327 {
 328         if (!hdac_acomp)
 329                 return -ENODEV;
 330
 331         hdac_acomp->audio_ops = aops;
 332         return 0;
 333 }
 334 EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
 335
 336 /* check whether intel graphics is present */
 337 static bool i915_gfx_present(void)
 338 {
 339         static const struct pci_device_id ids[] = {
 340                 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
 341                   .class = PCI_BASE_CLASS_DISPLAY << 16,
 342                   .class_mask = 0xff << 16 },
 343                 {}
 344         };
 345         return pci_dev_present(ids);
 346 }
 347
 348 /**
 349  * snd_hdac_i915_init - Initialize i915 audio component
 350  * @bus: HDA core bus
 351  *
 352  * This function is supposed to be used only by a HD-audio controller
 353  * driver that needs the interaction with i915 graphics.
 354  *
 355  * This function initializes and sets up the audio component to communicate
 356  * with i915 graphics driver.
 357  *
 358  * Returns zero for success or a negative error code.
 359  */
 360 int snd_hdac_i915_init(struct hdac_bus *bus)
 361 {
 362         struct component_match *match = NULL;
 363         struct device *dev = bus->dev;
 364         struct i915_audio_component *acomp;
 365         int ret;
 366
 367         if (WARN_ON(hdac_acomp))
 368                 return -EBUSY;
 369
 370         if (!i915_gfx_present())
 371                 return -ENODEV;
 372
 373         acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
 374         if (!acomp)
 375                 return -ENOMEM;
 376         bus->audio_component = acomp;
 377         hdac_acomp = acomp;
 378
 379         component_match_add(dev, &match, hdac_component_master_match, bus);
 380         ret = component_master_add_with_match(dev, &hdac_component_master_ops,
 381                                               match);
 382         if (ret < 0)
 383                 goto out_err;
 384
 385         /*
 386          * Atm, we don't support deferring the component binding, so make sure
 387          * i915 is loaded and that the binding successfully completes.
 388          */
 389         request_module("i915");
 390
 391         if (!acomp->ops) {
 392                 ret = -ENODEV;
 393                 goto out_master_del;
 394         }
 395         dev_dbg(dev, "bound to i915 component master\n");
 396
 397         return 0;
 398 out_master_del:
 399         component_master_del(dev, &hdac_component_master_ops);
 400 out_err:
 401         kfree(acomp);
 402         bus->audio_component = NULL;
 403         hdac_acomp = NULL;
 404         dev_info(dev, "failed to add i915 component master (%d)\n", ret);
 405
 406         return ret;
 407 }
 408 EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
 409
 410 /**
 411  * snd_hdac_i915_exit - Finalize i915 audio component
 412  * @bus: HDA core bus
 413  *
 414  * This function is supposed to be used only by a HD-audio controller
 415  * driver that needs the interaction with i915 graphics.
 416  *
 417  * This function releases the i915 audio component that has been used.
 418  *
 419  * Returns zero for success or a negative error code.
 420  */
 421 int snd_hdac_i915_exit(struct hdac_bus *bus)
 422 {
 423         struct device *dev = bus->dev;
 424         struct i915_audio_component *acomp = bus->audio_component;
 425
 426         if (!acomp)
 427                 return 0;
 428
 429         WARN_ON(bus->i915_power_refcount);
 430         if (bus->i915_power_refcount > 0 && acomp->ops)
 431                 acomp->ops->put_power(acomp->dev);
 432
 433         component_master_del(dev, &hdac_component_master_ops);
 434
 435         kfree(acomp);
 436         bus->audio_component = NULL;
 437         hdac_acomp = NULL;
 438
 439         return 0;
 440 }
 441 EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);