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Linux/sound/hda/hdac_i915.c

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  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 (WARN_ON(!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 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);
442 

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