Commit | Line | Data |
---|---|---|
98d8fc6c ML |
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> | |
bb03ed21 | 23 | #include <sound/hda_register.h> |
98d8fc6c ML |
24 | |
25 | static struct i915_audio_component *hdac_acomp; | |
26 | ||
78dd5e21 TI |
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 | */ | |
98d8fc6c ML |
40 | int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) |
41 | { | |
42 | struct i915_audio_component *acomp = bus->audio_component; | |
43 | ||
692af901 | 44 | if (!acomp || !acomp->ops) |
98d8fc6c ML |
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 | ||
78dd5e21 TI |
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 | */ | |
98d8fc6c ML |
75 | int snd_hdac_display_power(struct hdac_bus *bus, bool enable) |
76 | { | |
77 | struct i915_audio_component *acomp = bus->audio_component; | |
78 | ||
692af901 | 79 | if (!acomp || !acomp->ops) |
98d8fc6c ML |
80 | return -ENODEV; |
81 | ||
82 | dev_dbg(bus->dev, "display power %s\n", | |
83 | enable ? "enable" : "disable"); | |
84 | ||
85 | if (enable) { | |
033ea349 | 86 | if (!bus->i915_power_refcount++) { |
98d8fc6c | 87 | acomp->ops->get_power(acomp->dev); |
033ea349 DH |
88 | snd_hdac_set_codec_wakeup(bus, true); |
89 | snd_hdac_set_codec_wakeup(bus, false); | |
90 | } | |
98d8fc6c ML |
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 | ||
bb03ed21 TI |
101 | #define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \ |
102 | ((pci)->device == 0x0c0c) || \ | |
103 | ((pci)->device == 0x0d0c) || \ | |
104 | ((pci)->device == 0x160c)) | |
105 | ||
78dd5e21 | 106 | /** |
bb03ed21 | 107 | * snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW |
78dd5e21 TI |
108 | * @bus: HDA core bus |
109 | * | |
bb03ed21 TI |
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. | |
78dd5e21 | 116 | * |
bb03ed21 TI |
117 | * Call this function at initializing and changing power well, as well as |
118 | * at ELD notifier for the hotplug. | |
78dd5e21 | 119 | */ |
bb03ed21 | 120 | void snd_hdac_i915_set_bclk(struct hdac_bus *bus) |
98d8fc6c ML |
121 | { |
122 | struct i915_audio_component *acomp = bus->audio_component; | |
bb03ed21 TI |
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 | } | |
98d8fc6c | 155 | |
bb03ed21 TI |
156 | snd_hdac_chip_writew(bus, HSW_EM4, bclk_m); |
157 | snd_hdac_chip_writew(bus, HSW_EM5, bclk_n); | |
98d8fc6c | 158 | } |
bb03ed21 | 159 | EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk); |
98d8fc6c | 160 | |
e2dc7d7d TI |
161 | /* There is a fixed mapping between audio pin node and display port |
162 | * on current Intel platforms: | |
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 | static int pin2port(hda_nid_t pin_nid) | |
168 | { | |
1a414f48 TI |
169 | if (WARN_ON(pin_nid < 5 || pin_nid > 7)) |
170 | return -1; | |
e2dc7d7d TI |
171 | return pin_nid - 4; |
172 | } | |
173 | ||
174 | /** | |
175 | * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate | |
176 | * @bus: HDA core bus | |
177 | * @nid: the pin widget NID | |
178 | * @rate: the sample rate to set | |
179 | * | |
180 | * This function is supposed to be used only by a HD-audio controller | |
181 | * driver that needs the interaction with i915 graphics. | |
182 | * | |
183 | * This function sets N/CTS value based on the given sample rate. | |
184 | * Returns zero for success, or a negative error code. | |
185 | */ | |
186 | int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate) | |
187 | { | |
188 | struct i915_audio_component *acomp = bus->audio_component; | |
1a414f48 | 189 | int port; |
e2dc7d7d TI |
190 | |
191 | if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate) | |
192 | return -ENODEV; | |
1a414f48 TI |
193 | port = pin2port(nid); |
194 | if (port < 0) | |
195 | return -EINVAL; | |
196 | return acomp->ops->sync_audio_rate(acomp->dev, port, rate); | |
e2dc7d7d TI |
197 | } |
198 | EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate); | |
199 | ||
200 | /** | |
201 | * snd_hdac_acomp_get_eld - Get the audio state and ELD via component | |
202 | * @bus: HDA core bus | |
203 | * @nid: the pin widget NID | |
204 | * @audio_enabled: the pointer to store the current audio state | |
205 | * @buffer: the buffer pointer to store ELD bytes | |
206 | * @max_bytes: the max bytes to be stored on @buffer | |
207 | * | |
208 | * This function is supposed to be used only by a HD-audio controller | |
209 | * driver that needs the interaction with i915 graphics. | |
210 | * | |
211 | * This function queries the current state of the audio on the given | |
212 | * digital port and fetches the ELD bytes onto the given buffer. | |
213 | * It returns the number of bytes for the total ELD data, zero for | |
214 | * invalid ELD, or a negative error code. | |
215 | * | |
216 | * The return size is the total bytes required for the whole ELD bytes, | |
217 | * thus it may be over @max_bytes. If it's over @max_bytes, it implies | |
218 | * that only a part of ELD bytes have been fetched. | |
219 | */ | |
220 | int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid, | |
221 | bool *audio_enabled, char *buffer, int max_bytes) | |
222 | { | |
223 | struct i915_audio_component *acomp = bus->audio_component; | |
1a414f48 | 224 | int port; |
e2dc7d7d TI |
225 | |
226 | if (!acomp || !acomp->ops || !acomp->ops->get_eld) | |
227 | return -ENODEV; | |
228 | ||
1a414f48 TI |
229 | port = pin2port(nid); |
230 | if (port < 0) | |
231 | return -EINVAL; | |
232 | return acomp->ops->get_eld(acomp->dev, port, audio_enabled, | |
e2dc7d7d TI |
233 | buffer, max_bytes); |
234 | } | |
235 | EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld); | |
236 | ||
98d8fc6c ML |
237 | static int hdac_component_master_bind(struct device *dev) |
238 | { | |
239 | struct i915_audio_component *acomp = hdac_acomp; | |
240 | int ret; | |
241 | ||
242 | ret = component_bind_all(dev, acomp); | |
243 | if (ret < 0) | |
244 | return ret; | |
245 | ||
246 | if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power && | |
247 | acomp->ops->put_power && acomp->ops->get_cdclk_freq))) { | |
248 | ret = -EINVAL; | |
249 | goto out_unbind; | |
250 | } | |
251 | ||
252 | /* | |
253 | * Atm, we don't support dynamic unbinding initiated by the child | |
254 | * component, so pin its containing module until we unbind. | |
255 | */ | |
256 | if (!try_module_get(acomp->ops->owner)) { | |
257 | ret = -ENODEV; | |
258 | goto out_unbind; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | ||
263 | out_unbind: | |
264 | component_unbind_all(dev, acomp); | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | static void hdac_component_master_unbind(struct device *dev) | |
270 | { | |
271 | struct i915_audio_component *acomp = hdac_acomp; | |
272 | ||
273 | module_put(acomp->ops->owner); | |
274 | component_unbind_all(dev, acomp); | |
275 | WARN_ON(acomp->ops || acomp->dev); | |
276 | } | |
277 | ||
278 | static const struct component_master_ops hdac_component_master_ops = { | |
279 | .bind = hdac_component_master_bind, | |
280 | .unbind = hdac_component_master_unbind, | |
281 | }; | |
282 | ||
283 | static int hdac_component_master_match(struct device *dev, void *data) | |
284 | { | |
285 | /* i915 is the only supported component */ | |
286 | return !strcmp(dev->driver->name, "i915"); | |
287 | } | |
288 | ||
78dd5e21 TI |
289 | /** |
290 | * snd_hdac_i915_register_notifier - Register i915 audio component ops | |
291 | * @aops: i915 audio component ops | |
292 | * | |
293 | * This function is supposed to be used only by a HD-audio controller | |
294 | * driver that needs the interaction with i915 graphics. | |
295 | * | |
296 | * This function sets the given ops to be called by the i915 graphics driver. | |
297 | * | |
298 | * Returns zero for success or a negative error code. | |
299 | */ | |
45c053df DH |
300 | int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops) |
301 | { | |
302 | if (WARN_ON(!hdac_acomp)) | |
303 | return -ENODEV; | |
304 | ||
305 | hdac_acomp->audio_ops = aops; | |
306 | return 0; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier); | |
309 | ||
bfa5fb14 TI |
310 | /* check whether intel graphics is present */ |
311 | static bool i915_gfx_present(void) | |
312 | { | |
313 | static struct pci_device_id ids[] = { | |
314 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID), | |
315 | .class = PCI_BASE_CLASS_DISPLAY << 16, | |
316 | .class_mask = 0xff << 16 }, | |
317 | {} | |
318 | }; | |
319 | return pci_dev_present(ids); | |
320 | } | |
321 | ||
78dd5e21 TI |
322 | /** |
323 | * snd_hdac_i915_init - Initialize i915 audio component | |
324 | * @bus: HDA core bus | |
325 | * | |
326 | * This function is supposed to be used only by a HD-audio controller | |
327 | * driver that needs the interaction with i915 graphics. | |
328 | * | |
329 | * This function initializes and sets up the audio component to communicate | |
330 | * with i915 graphics driver. | |
331 | * | |
332 | * Returns zero for success or a negative error code. | |
333 | */ | |
98d8fc6c ML |
334 | int snd_hdac_i915_init(struct hdac_bus *bus) |
335 | { | |
336 | struct component_match *match = NULL; | |
337 | struct device *dev = bus->dev; | |
338 | struct i915_audio_component *acomp; | |
339 | int ret; | |
340 | ||
bfa5fb14 TI |
341 | if (!i915_gfx_present()) |
342 | return -ENODEV; | |
343 | ||
98d8fc6c ML |
344 | acomp = kzalloc(sizeof(*acomp), GFP_KERNEL); |
345 | if (!acomp) | |
346 | return -ENOMEM; | |
347 | bus->audio_component = acomp; | |
348 | hdac_acomp = acomp; | |
349 | ||
350 | component_match_add(dev, &match, hdac_component_master_match, bus); | |
351 | ret = component_master_add_with_match(dev, &hdac_component_master_ops, | |
352 | match); | |
353 | if (ret < 0) | |
354 | goto out_err; | |
355 | ||
356 | /* | |
357 | * Atm, we don't support deferring the component binding, so make sure | |
358 | * i915 is loaded and that the binding successfully completes. | |
359 | */ | |
360 | request_module("i915"); | |
361 | ||
362 | if (!acomp->ops) { | |
363 | ret = -ENODEV; | |
364 | goto out_master_del; | |
365 | } | |
366 | dev_dbg(dev, "bound to i915 component master\n"); | |
367 | ||
368 | return 0; | |
369 | out_master_del: | |
370 | component_master_del(dev, &hdac_component_master_ops); | |
371 | out_err: | |
372 | kfree(acomp); | |
373 | bus->audio_component = NULL; | |
bed2e98e | 374 | dev_info(dev, "failed to add i915 component master (%d)\n", ret); |
98d8fc6c ML |
375 | |
376 | return ret; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(snd_hdac_i915_init); | |
379 | ||
78dd5e21 TI |
380 | /** |
381 | * snd_hdac_i915_exit - Finalize i915 audio component | |
382 | * @bus: HDA core bus | |
383 | * | |
384 | * This function is supposed to be used only by a HD-audio controller | |
385 | * driver that needs the interaction with i915 graphics. | |
386 | * | |
387 | * This function releases the i915 audio component that has been used. | |
388 | * | |
389 | * Returns zero for success or a negative error code. | |
390 | */ | |
98d8fc6c ML |
391 | int snd_hdac_i915_exit(struct hdac_bus *bus) |
392 | { | |
393 | struct device *dev = bus->dev; | |
394 | struct i915_audio_component *acomp = bus->audio_component; | |
395 | ||
692af901 TI |
396 | if (!acomp) |
397 | return 0; | |
398 | ||
98d8fc6c | 399 | WARN_ON(bus->i915_power_refcount); |
692af901 | 400 | if (bus->i915_power_refcount > 0 && acomp->ops) |
98d8fc6c ML |
401 | acomp->ops->put_power(acomp->dev); |
402 | ||
403 | component_master_del(dev, &hdac_component_master_ops); | |
404 | ||
405 | kfree(acomp); | |
406 | bus->audio_component = NULL; | |
407 | ||
408 | return 0; | |
409 | } | |
410 | EXPORT_SYMBOL_GPL(snd_hdac_i915_exit); |