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  * @rate: the sample rate to set
 197  *
 198  * This function is supposed to be used only by a HD-audio controller
 199  * driver that needs the interaction with i915 graphics.
 200  *
 201  * This function sets N/CTS value based on the given sample rate.
 202  * Returns zero for success, or a negative error code.
 203  */
 204 int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, int rate)
 205 {
 206         struct hdac_bus *bus = codec->bus;
 207         struct i915_audio_component *acomp = bus->audio_component;
 208         int port;
 209
 210         if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
 211                 return -ENODEV;
 212         port = pin2port(codec, nid);
 213         if (port < 0)
 214                 return -EINVAL;
 215         return acomp->ops->sync_audio_rate(acomp->dev, port, rate);
 216 }
 217 EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
 218
 219 /**
 220  * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
 221  * @codec: HDA codec
 222  * @nid: the pin widget NID
 223  * @audio_enabled: the pointer to store the current audio state
 224  * @buffer: the buffer pointer to store ELD bytes
 225  * @max_bytes: the max bytes to be stored on @buffer
 226  *
 227  * This function is supposed to be used only by a HD-audio controller
 228  * driver that needs the interaction with i915 graphics.
 229  *
 230  * This function queries the current state of the audio on the given
 231  * digital port and fetches the ELD bytes onto the given buffer.
 232  * It returns the number of bytes for the total ELD data, zero for
 233  * invalid ELD, or a negative error code.
 234  *
 235  * The return size is the total bytes required for the whole ELD bytes,
 236  * thus it may be over @max_bytes.  If it's over @max_bytes, it implies
 237  * that only a part of ELD bytes have been fetched.
 238  */
 239 int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid,
 240                            bool *audio_enabled, char *buffer, int max_bytes)
 241 {
 242         struct hdac_bus *bus = codec->bus;
 243         struct i915_audio_component *acomp = bus->audio_component;
 244         int port;
 245
 246         if (!acomp || !acomp->ops || !acomp->ops->get_eld)
 247                 return -ENODEV;
 248
 249         port = pin2port(codec, nid);
 250         if (port < 0)
 251                 return -EINVAL;
 252         return acomp->ops->get_eld(acomp->dev, port, audio_enabled,
 253                                    buffer, max_bytes);
 254 }
 255 EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
 256
 257 static int hdac_component_master_bind(struct device *dev)
 258 {
 259         struct i915_audio_component *acomp = hdac_acomp;
 260         int ret;
 261
 262         ret = component_bind_all(dev, acomp);
 263         if (ret < 0)
 264                 return ret;
 265
 266         if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
 267                       acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
 268                 ret = -EINVAL;
 269                 goto out_unbind;
 270         }
 271
 272         /*
 273          * Atm, we don't support dynamic unbinding initiated by the child
 274          * component, so pin its containing module until we unbind.
 275          */
 276         if (!try_module_get(acomp->ops->owner)) {
 277                 ret = -ENODEV;
 278                 goto out_unbind;
 279         }
 280
 281         return 0;
 282
 283 out_unbind:
 284         component_unbind_all(dev, acomp);
 285
 286         return ret;
 287 }
 288
 289 static void hdac_component_master_unbind(struct device *dev)
 290 {
 291         struct i915_audio_component *acomp = hdac_acomp;
 292
 293         module_put(acomp->ops->owner);
 294         component_unbind_all(dev, acomp);
 295         WARN_ON(acomp->ops || acomp->dev);
 296 }
 297
 298 static const struct component_master_ops hdac_component_master_ops = {
 299         .bind = hdac_component_master_bind,
 300         .unbind = hdac_component_master_unbind,
 301 };
 302
 303 static int hdac_component_master_match(struct device *dev, void *data)
 304 {
 305         /* i915 is the only supported component */
 306         return !strcmp(dev->driver->name, "i915");
 307 }
 308
 309 /**
 310  * snd_hdac_i915_register_notifier - Register i915 audio component ops
 311  * @aops: i915 audio component ops
 312  *
 313  * This function is supposed to be used only by a HD-audio controller
 314  * driver that needs the interaction with i915 graphics.
 315  *
 316  * This function sets the given ops to be called by the i915 graphics driver.
 317  *
 318  * Returns zero for success or a negative error code.
 319  */
 320 int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
 321 {
 322         if (!hdac_acomp)
 323                 return -ENODEV;
 324
 325         hdac_acomp->audio_ops = aops;
 326         return 0;
 327 }
 328 EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
 329
 330 /* check whether intel graphics is present */
 331 static bool i915_gfx_present(void)
 332 {
 333         static struct pci_device_id ids[] = {
 334                 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
 335                   .class = PCI_BASE_CLASS_DISPLAY << 16,
 336                   .class_mask = 0xff << 16 },
 337                 {}
 338         };
 339         return pci_dev_present(ids);
 340 }
 341
 342 /**
 343  * snd_hdac_i915_init - Initialize i915 audio component
 344  * @bus: HDA core bus
 345  *
 346  * This function is supposed to be used only by a HD-audio controller
 347  * driver that needs the interaction with i915 graphics.
 348  *
 349  * This function initializes and sets up the audio component to communicate
 350  * with i915 graphics driver.
 351  *
 352  * Returns zero for success or a negative error code.
 353  */
 354 int snd_hdac_i915_init(struct hdac_bus *bus)
 355 {
 356         struct component_match *match = NULL;
 357         struct device *dev = bus->dev;
 358         struct i915_audio_component *acomp;
 359         int ret;
 360
 361         if (WARN_ON(hdac_acomp))
 362                 return -EBUSY;
 363
 364         if (!i915_gfx_present())
 365                 return -ENODEV;
 366
 367         acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
 368         if (!acomp)
 369                 return -ENOMEM;
 370         bus->audio_component = acomp;
 371         hdac_acomp = acomp;
 372
 373         component_match_add(dev, &match, hdac_component_master_match, bus);
 374         ret = component_master_add_with_match(dev, &hdac_component_master_ops,
 375                                               match);
 376         if (ret < 0)
 377                 goto out_err;
 378
 379         /*
 380          * Atm, we don't support deferring the component binding, so make sure
 381          * i915 is loaded and that the binding successfully completes.
 382          */
 383         request_module("i915");
 384
 385         if (!acomp->ops) {
 386                 ret = -ENODEV;
 387                 goto out_master_del;
 388         }
 389         dev_dbg(dev, "bound to i915 component master\n");
 390
 391         return 0;
 392 out_master_del:
 393         component_master_del(dev, &hdac_component_master_ops);
 394 out_err:
 395         kfree(acomp);
 396         bus->audio_component = NULL;
 397         hdac_acomp = NULL;
 398         dev_info(dev, "failed to add i915 component master (%d)\n", ret);
 399
 400         return ret;
 401 }
 402 EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
 403
 404 /**
 405  * snd_hdac_i915_exit - Finalize i915 audio component
 406  * @bus: HDA core bus
 407  *
 408  * This function is supposed to be used only by a HD-audio controller
 409  * driver that needs the interaction with i915 graphics.
 410  *
 411  * This function releases the i915 audio component that has been used.
 412  *
 413  * Returns zero for success or a negative error code.
 414  */
 415 int snd_hdac_i915_exit(struct hdac_bus *bus)
 416 {
 417         struct device *dev = bus->dev;
 418         struct i915_audio_component *acomp = bus->audio_component;
 419
 420         if (!acomp)
 421                 return 0;
 422
 423         WARN_ON(bus->i915_power_refcount);
 424         if (bus->i915_power_refcount > 0 && acomp->ops)
 425                 acomp->ops->put_power(acomp->dev);
 426
 427         component_master_del(dev, &hdac_component_master_ops);
 428
 429         kfree(acomp);
 430         bus->audio_component = NULL;
 431         hdac_acomp = NULL;
 432
 433         return 0;
 434 }
 435 EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);