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6a9ee8af | 1 | /* |
a645654b LW |
2 | * vga_switcheroo.c - Support for laptop with dual GPU using one set of outputs |
3 | * | |
6a9ee8af DA |
4 | * Copyright (c) 2010 Red Hat Inc. |
5 | * Author : Dave Airlie <airlied@redhat.com> | |
6 | * | |
a645654b | 7 | * Copyright (c) 2015 Lukas Wunner <lukas@wunner.de> |
6a9ee8af | 8 | * |
a645654b LW |
9 | * Permission is hereby granted, free of charge, to any person obtaining a |
10 | * copy of this software and associated documentation files (the "Software"), | |
11 | * to deal in the Software without restriction, including without limitation | |
12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
13 | * and/or sell copies of the Software, and to permit persons to whom the | |
14 | * Software is furnished to do so, subject to the following conditions: | |
6a9ee8af | 15 | * |
a645654b LW |
16 | * The above copyright notice and this permission notice (including the next |
17 | * paragraph) shall be included in all copies or substantial portions of the | |
18 | * Software. | |
71309278 | 19 | * |
a645654b LW |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
26 | * DEALINGS | |
27 | * IN THE SOFTWARE. | |
71309278 | 28 | * |
6a9ee8af DA |
29 | */ |
30 | ||
9b0be1eb TR |
31 | #define pr_fmt(fmt) "vga_switcheroo: " fmt |
32 | ||
4127838c | 33 | #include <linux/console.h> |
6a9ee8af DA |
34 | #include <linux/debugfs.h> |
35 | #include <linux/fb.h> | |
4127838c LW |
36 | #include <linux/fs.h> |
37 | #include <linux/module.h> | |
6a9ee8af | 38 | #include <linux/pci.h> |
989561de | 39 | #include <linux/pm_domain.h> |
0d69704a | 40 | #include <linux/pm_runtime.h> |
4127838c LW |
41 | #include <linux/seq_file.h> |
42 | #include <linux/uaccess.h> | |
2fbe8c7c | 43 | #include <linux/vgaarb.h> |
4127838c | 44 | #include <linux/vga_switcheroo.h> |
2fbe8c7c | 45 | |
a645654b LW |
46 | /** |
47 | * DOC: Overview | |
48 | * | |
49 | * vga_switcheroo is the Linux subsystem for laptop hybrid graphics. | |
50 | * These come in two flavors: | |
51 | * | |
52 | * * muxed: Dual GPUs with a multiplexer chip to switch outputs between GPUs. | |
53 | * * muxless: Dual GPUs but only one of them is connected to outputs. | |
54 | * The other one is merely used to offload rendering, its results | |
55 | * are copied over PCIe into the framebuffer. On Linux this is | |
56 | * supported with DRI PRIME. | |
57 | * | |
58 | * Hybrid graphics started to appear in the late Naughties and were initially | |
59 | * all muxed. Newer laptops moved to a muxless architecture for cost reasons. | |
60 | * A notable exception is the MacBook Pro which continues to use a mux. | |
61 | * Muxes come with varying capabilities: Some switch only the panel, others | |
62 | * can also switch external displays. Some switch all display pins at once | |
63 | * while others can switch just the DDC lines. (To allow EDID probing | |
64 | * for the inactive GPU.) Also, muxes are often used to cut power to the | |
65 | * discrete GPU while it is not used. | |
66 | * | |
3a848662 | 67 | * DRM drivers register GPUs with vga_switcheroo, these are henceforth called |
a645654b LW |
68 | * clients. The mux is called the handler. Muxless machines also register a |
69 | * handler to control the power state of the discrete GPU, its ->switchto | |
70 | * callback is a no-op for obvious reasons. The discrete GPU is often equipped | |
71 | * with an HDA controller for the HDMI/DP audio signal, this will also | |
72 | * register as a client so that vga_switcheroo can take care of the correct | |
73 | * suspend/resume order when changing the discrete GPU's power state. In total | |
74 | * there can thus be up to three clients: Two vga clients (GPUs) and one audio | |
75 | * client (on the discrete GPU). The code is mostly prepared to support | |
76 | * machines with more than two GPUs should they become available. | |
77 | * The GPU to which the outputs are currently switched is called the | |
78 | * active client in vga_switcheroo parlance. The GPU not in use is the | |
79 | * inactive client. | |
80 | */ | |
81 | ||
82 | /** | |
83 | * struct vga_switcheroo_client - registered client | |
84 | * @pdev: client pci device | |
85 | * @fb_info: framebuffer to which console is remapped on switching | |
86 | * @pwr_state: current power state | |
87 | * @ops: client callbacks | |
21c5ba8c LW |
88 | * @id: client identifier. Determining the id requires the handler, |
89 | * so gpus are initially assigned VGA_SWITCHEROO_UNKNOWN_ID | |
90 | * and later given their true id in vga_switcheroo_enable() | |
a645654b LW |
91 | * @active: whether the outputs are currently switched to this client |
92 | * @driver_power_control: whether power state is controlled by the driver's | |
93 | * runtime pm. If true, writing ON and OFF to the vga_switcheroo debugfs | |
94 | * interface is a no-op so as not to interfere with runtime pm | |
95 | * @list: client list | |
96 | * | |
97 | * Registered client. A client can be either a GPU or an audio device on a GPU. | |
98 | * For audio clients, the @fb_info, @active and @driver_power_control members | |
99 | * are bogus. | |
100 | */ | |
6a9ee8af DA |
101 | struct vga_switcheroo_client { |
102 | struct pci_dev *pdev; | |
103 | struct fb_info *fb_info; | |
203d027d | 104 | enum vga_switcheroo_state pwr_state; |
26ec685f | 105 | const struct vga_switcheroo_client_ops *ops; |
fa3e967f | 106 | enum vga_switcheroo_client_id id; |
6a9ee8af | 107 | bool active; |
0d69704a | 108 | bool driver_power_control; |
79721e0a | 109 | struct list_head list; |
6a9ee8af DA |
110 | }; |
111 | ||
a645654b LW |
112 | /* |
113 | * protects access to struct vgasr_priv | |
114 | */ | |
6a9ee8af DA |
115 | static DEFINE_MUTEX(vgasr_mutex); |
116 | ||
a645654b LW |
117 | /** |
118 | * struct vgasr_priv - vga_switcheroo private data | |
119 | * @active: whether vga_switcheroo is enabled. | |
120 | * Prerequisite is the registration of two GPUs and a handler | |
121 | * @delayed_switch_active: whether a delayed switch is pending | |
122 | * @delayed_client_id: client to which a delayed switch is pending | |
123 | * @debugfs_root: directory for vga_switcheroo debugfs interface | |
124 | * @switch_file: file for vga_switcheroo debugfs interface | |
125 | * @registered_clients: number of registered GPUs | |
126 | * (counting only vga clients, not audio clients) | |
127 | * @clients: list of registered clients | |
128 | * @handler: registered handler | |
129 | * | |
130 | * vga_switcheroo private data. Currently only one vga_switcheroo instance | |
131 | * per system is supported. | |
132 | */ | |
6a9ee8af | 133 | struct vgasr_priv { |
6a9ee8af DA |
134 | bool active; |
135 | bool delayed_switch_active; | |
136 | enum vga_switcheroo_client_id delayed_client_id; | |
137 | ||
138 | struct dentry *debugfs_root; | |
139 | struct dentry *switch_file; | |
140 | ||
141 | int registered_clients; | |
79721e0a | 142 | struct list_head clients; |
6a9ee8af | 143 | |
5d170139 | 144 | const struct vga_switcheroo_handler *handler; |
6a9ee8af DA |
145 | }; |
146 | ||
3e9e63db TI |
147 | #define ID_BIT_AUDIO 0x100 |
148 | #define client_is_audio(c) ((c)->id & ID_BIT_AUDIO) | |
21c5ba8c LW |
149 | #define client_is_vga(c) ((c)->id == VGA_SWITCHEROO_UNKNOWN_ID || \ |
150 | !client_is_audio(c)) | |
3e9e63db TI |
151 | #define client_id(c) ((c)->id & ~ID_BIT_AUDIO) |
152 | ||
6a9ee8af DA |
153 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv); |
154 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv); | |
155 | ||
156 | /* only one switcheroo per system */ | |
79721e0a TI |
157 | static struct vgasr_priv vgasr_priv = { |
158 | .clients = LIST_HEAD_INIT(vgasr_priv.clients), | |
159 | }; | |
6a9ee8af | 160 | |
36704c0c | 161 | static bool vga_switcheroo_ready(void) |
6a9ee8af | 162 | { |
36704c0c SF |
163 | /* we're ready if we get two clients + handler */ |
164 | return !vgasr_priv.active && | |
165 | vgasr_priv.registered_clients == 2 && vgasr_priv.handler; | |
6a9ee8af | 166 | } |
6a9ee8af DA |
167 | |
168 | static void vga_switcheroo_enable(void) | |
169 | { | |
6a9ee8af | 170 | int ret; |
79721e0a TI |
171 | struct vga_switcheroo_client *client; |
172 | ||
6a9ee8af | 173 | /* call the handler to init */ |
e99eac5e SF |
174 | if (vgasr_priv.handler->init) |
175 | vgasr_priv.handler->init(); | |
6a9ee8af | 176 | |
79721e0a | 177 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
21c5ba8c | 178 | if (client->id != VGA_SWITCHEROO_UNKNOWN_ID) |
3e9e63db | 179 | continue; |
79721e0a | 180 | ret = vgasr_priv.handler->get_client_id(client->pdev); |
6a9ee8af DA |
181 | if (ret < 0) |
182 | return; | |
183 | ||
79721e0a | 184 | client->id = ret; |
6a9ee8af DA |
185 | } |
186 | vga_switcheroo_debugfs_init(&vgasr_priv); | |
187 | vgasr_priv.active = true; | |
188 | } | |
189 | ||
a645654b LW |
190 | /** |
191 | * vga_switcheroo_register_handler() - register handler | |
192 | * @handler: handler callbacks | |
193 | * | |
194 | * Register handler. Enable vga_switcheroo if two vga clients have already | |
195 | * registered. | |
196 | * | |
197 | * Return: 0 on success, -EINVAL if a handler was already registered. | |
198 | */ | |
5d170139 | 199 | int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler) |
36704c0c SF |
200 | { |
201 | mutex_lock(&vgasr_mutex); | |
202 | if (vgasr_priv.handler) { | |
203 | mutex_unlock(&vgasr_mutex); | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | vgasr_priv.handler = handler; | |
208 | if (vga_switcheroo_ready()) { | |
9b0be1eb | 209 | pr_info("enabled\n"); |
36704c0c SF |
210 | vga_switcheroo_enable(); |
211 | } | |
212 | mutex_unlock(&vgasr_mutex); | |
213 | return 0; | |
214 | } | |
215 | EXPORT_SYMBOL(vga_switcheroo_register_handler); | |
216 | ||
a645654b LW |
217 | /** |
218 | * vga_switcheroo_unregister_handler() - unregister handler | |
219 | * | |
220 | * Unregister handler. Disable vga_switcheroo. | |
221 | */ | |
36704c0c SF |
222 | void vga_switcheroo_unregister_handler(void) |
223 | { | |
224 | mutex_lock(&vgasr_mutex); | |
225 | vgasr_priv.handler = NULL; | |
226 | if (vgasr_priv.active) { | |
9b0be1eb | 227 | pr_info("disabled\n"); |
36704c0c SF |
228 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
229 | vgasr_priv.active = false; | |
230 | } | |
231 | mutex_unlock(&vgasr_mutex); | |
232 | } | |
233 | EXPORT_SYMBOL(vga_switcheroo_unregister_handler); | |
234 | ||
3e9e63db TI |
235 | static int register_client(struct pci_dev *pdev, |
236 | const struct vga_switcheroo_client_ops *ops, | |
fa3e967f LW |
237 | enum vga_switcheroo_client_id id, bool active, |
238 | bool driver_power_control) | |
6a9ee8af | 239 | { |
79721e0a | 240 | struct vga_switcheroo_client *client; |
6a9ee8af | 241 | |
79721e0a TI |
242 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
243 | if (!client) | |
244 | return -ENOMEM; | |
245 | ||
246 | client->pwr_state = VGA_SWITCHEROO_ON; | |
247 | client->pdev = pdev; | |
26ec685f | 248 | client->ops = ops; |
3e9e63db TI |
249 | client->id = id; |
250 | client->active = active; | |
0d69704a | 251 | client->driver_power_control = driver_power_control; |
6a9ee8af | 252 | |
79721e0a TI |
253 | mutex_lock(&vgasr_mutex); |
254 | list_add_tail(&client->list, &vgasr_priv.clients); | |
3e9e63db TI |
255 | if (client_is_vga(client)) |
256 | vgasr_priv.registered_clients++; | |
6a9ee8af | 257 | |
36704c0c | 258 | if (vga_switcheroo_ready()) { |
9b0be1eb | 259 | pr_info("enabled\n"); |
6a9ee8af DA |
260 | vga_switcheroo_enable(); |
261 | } | |
262 | mutex_unlock(&vgasr_mutex); | |
263 | return 0; | |
264 | } | |
3e9e63db | 265 | |
a645654b LW |
266 | /** |
267 | * vga_switcheroo_register_client - register vga client | |
268 | * @pdev: client pci device | |
269 | * @ops: client callbacks | |
270 | * @driver_power_control: whether power state is controlled by the driver's | |
271 | * runtime pm | |
272 | * | |
273 | * Register vga client (GPU). Enable vga_switcheroo if another GPU and a | |
274 | * handler have already registered. The power state of the client is assumed | |
275 | * to be ON. | |
276 | * | |
277 | * Return: 0 on success, -ENOMEM on memory allocation error. | |
278 | */ | |
3e9e63db | 279 | int vga_switcheroo_register_client(struct pci_dev *pdev, |
0d69704a DA |
280 | const struct vga_switcheroo_client_ops *ops, |
281 | bool driver_power_control) | |
3e9e63db | 282 | { |
21c5ba8c | 283 | return register_client(pdev, ops, VGA_SWITCHEROO_UNKNOWN_ID, |
7491bfb4 TR |
284 | pdev == vga_default_device(), |
285 | driver_power_control); | |
3e9e63db | 286 | } |
6a9ee8af DA |
287 | EXPORT_SYMBOL(vga_switcheroo_register_client); |
288 | ||
a645654b LW |
289 | /** |
290 | * vga_switcheroo_register_audio_client - register audio client | |
291 | * @pdev: client pci device | |
292 | * @ops: client callbacks | |
fa3e967f | 293 | * @id: client identifier |
a645654b LW |
294 | * |
295 | * Register audio client (audio device on a GPU). The power state of the | |
296 | * client is assumed to be ON. | |
297 | * | |
298 | * Return: 0 on success, -ENOMEM on memory allocation error. | |
299 | */ | |
3e9e63db TI |
300 | int vga_switcheroo_register_audio_client(struct pci_dev *pdev, |
301 | const struct vga_switcheroo_client_ops *ops, | |
fa3e967f | 302 | enum vga_switcheroo_client_id id) |
3e9e63db | 303 | { |
21b45676 | 304 | return register_client(pdev, ops, id | ID_BIT_AUDIO, false, false); |
3e9e63db TI |
305 | } |
306 | EXPORT_SYMBOL(vga_switcheroo_register_audio_client); | |
307 | ||
79721e0a TI |
308 | static struct vga_switcheroo_client * |
309 | find_client_from_pci(struct list_head *head, struct pci_dev *pdev) | |
310 | { | |
311 | struct vga_switcheroo_client *client; | |
7491bfb4 | 312 | |
79721e0a TI |
313 | list_for_each_entry(client, head, list) |
314 | if (client->pdev == pdev) | |
315 | return client; | |
316 | return NULL; | |
317 | } | |
318 | ||
319 | static struct vga_switcheroo_client * | |
fa3e967f LW |
320 | find_client_from_id(struct list_head *head, |
321 | enum vga_switcheroo_client_id client_id) | |
79721e0a TI |
322 | { |
323 | struct vga_switcheroo_client *client; | |
7491bfb4 | 324 | |
79721e0a TI |
325 | list_for_each_entry(client, head, list) |
326 | if (client->id == client_id) | |
327 | return client; | |
328 | return NULL; | |
329 | } | |
330 | ||
331 | static struct vga_switcheroo_client * | |
332 | find_active_client(struct list_head *head) | |
333 | { | |
334 | struct vga_switcheroo_client *client; | |
7491bfb4 | 335 | |
79721e0a | 336 | list_for_each_entry(client, head, list) |
21b45676 | 337 | if (client->active) |
79721e0a TI |
338 | return client; |
339 | return NULL; | |
340 | } | |
341 | ||
a645654b LW |
342 | /** |
343 | * vga_switcheroo_get_client_state() - obtain power state of a given client | |
344 | * @pdev: client pci device | |
345 | * | |
346 | * Obtain power state of a given client as seen from vga_switcheroo. | |
347 | * The function is only called from hda_intel.c. | |
348 | * | |
349 | * Return: Power state. | |
350 | */ | |
203d027d | 351 | enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *pdev) |
c8e9cf7b TI |
352 | { |
353 | struct vga_switcheroo_client *client; | |
8f12a311 | 354 | enum vga_switcheroo_state ret; |
c8e9cf7b | 355 | |
8f12a311 | 356 | mutex_lock(&vgasr_mutex); |
c8e9cf7b TI |
357 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
358 | if (!client) | |
8f12a311 | 359 | ret = VGA_SWITCHEROO_NOT_FOUND; |
8f12a311 LW |
360 | else |
361 | ret = client->pwr_state; | |
362 | mutex_unlock(&vgasr_mutex); | |
363 | return ret; | |
c8e9cf7b TI |
364 | } |
365 | EXPORT_SYMBOL(vga_switcheroo_get_client_state); | |
366 | ||
a645654b LW |
367 | /** |
368 | * vga_switcheroo_unregister_client() - unregister client | |
369 | * @pdev: client pci device | |
370 | * | |
371 | * Unregister client. Disable vga_switcheroo if this is a vga client (GPU). | |
372 | */ | |
6a9ee8af DA |
373 | void vga_switcheroo_unregister_client(struct pci_dev *pdev) |
374 | { | |
79721e0a | 375 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
376 | |
377 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
378 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
379 | if (client) { | |
3e9e63db TI |
380 | if (client_is_vga(client)) |
381 | vgasr_priv.registered_clients--; | |
79721e0a TI |
382 | list_del(&client->list); |
383 | kfree(client); | |
6a9ee8af | 384 | } |
3e9e63db | 385 | if (vgasr_priv.active && vgasr_priv.registered_clients < 2) { |
9b0be1eb | 386 | pr_info("disabled\n"); |
3e9e63db TI |
387 | vga_switcheroo_debugfs_fini(&vgasr_priv); |
388 | vgasr_priv.active = false; | |
389 | } | |
6a9ee8af DA |
390 | mutex_unlock(&vgasr_mutex); |
391 | } | |
392 | EXPORT_SYMBOL(vga_switcheroo_unregister_client); | |
393 | ||
a645654b LW |
394 | /** |
395 | * vga_switcheroo_client_fb_set() - set framebuffer of a given client | |
396 | * @pdev: client pci device | |
397 | * @info: framebuffer | |
398 | * | |
399 | * Set framebuffer of a given client. The console will be remapped to this | |
400 | * on switching. | |
401 | */ | |
6a9ee8af DA |
402 | void vga_switcheroo_client_fb_set(struct pci_dev *pdev, |
403 | struct fb_info *info) | |
404 | { | |
79721e0a | 405 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
406 | |
407 | mutex_lock(&vgasr_mutex); | |
79721e0a TI |
408 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
409 | if (client) | |
410 | client->fb_info = info; | |
6a9ee8af DA |
411 | mutex_unlock(&vgasr_mutex); |
412 | } | |
413 | EXPORT_SYMBOL(vga_switcheroo_client_fb_set); | |
414 | ||
a645654b LW |
415 | /** |
416 | * DOC: Manual switching and manual power control | |
417 | * | |
418 | * In this mode of use, the file /sys/kernel/debug/vgaswitcheroo/switch | |
419 | * can be read to retrieve the current vga_switcheroo state and commands | |
420 | * can be written to it to change the state. The file appears as soon as | |
421 | * two GPU drivers and one handler have registered with vga_switcheroo. | |
422 | * The following commands are understood: | |
423 | * | |
424 | * * OFF: Power off the device not in use. | |
425 | * * ON: Power on the device not in use. | |
426 | * * IGD: Switch to the integrated graphics device. | |
427 | * Power on the integrated GPU if necessary, power off the discrete GPU. | |
428 | * Prerequisite is that no user space processes (e.g. Xorg, alsactl) | |
429 | * have opened device files of the GPUs or the audio client. If the | |
430 | * switch fails, the user may invoke lsof(8) or fuser(1) on /dev/dri/ | |
431 | * and /dev/snd/controlC1 to identify processes blocking the switch. | |
432 | * * DIS: Switch to the discrete graphics device. | |
433 | * * DIGD: Delayed switch to the integrated graphics device. | |
434 | * This will perform the switch once the last user space process has | |
435 | * closed the device files of the GPUs and the audio client. | |
436 | * * DDIS: Delayed switch to the discrete graphics device. | |
437 | * * MIGD: Mux-only switch to the integrated graphics device. | |
438 | * Does not remap console or change the power state of either gpu. | |
439 | * If the integrated GPU is currently off, the screen will turn black. | |
440 | * If it is on, the screen will show whatever happens to be in VRAM. | |
441 | * Either way, the user has to blindly enter the command to switch back. | |
442 | * * MDIS: Mux-only switch to the discrete graphics device. | |
443 | * | |
444 | * For GPUs whose power state is controlled by the driver's runtime pm, | |
445 | * the ON and OFF commands are a no-op (see next section). | |
446 | * | |
447 | * For muxless machines, the IGD/DIS, DIGD/DDIS and MIGD/MDIS commands | |
448 | * should not be used. | |
449 | */ | |
450 | ||
6a9ee8af DA |
451 | static int vga_switcheroo_show(struct seq_file *m, void *v) |
452 | { | |
79721e0a TI |
453 | struct vga_switcheroo_client *client; |
454 | int i = 0; | |
7491bfb4 | 455 | |
6a9ee8af | 456 | mutex_lock(&vgasr_mutex); |
79721e0a | 457 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
0d69704a | 458 | seq_printf(m, "%d:%s%s:%c:%s%s:%s\n", i, |
7491bfb4 TR |
459 | client_id(client) == VGA_SWITCHEROO_DIS ? "DIS" : |
460 | "IGD", | |
3e9e63db | 461 | client_is_vga(client) ? "" : "-Audio", |
79721e0a | 462 | client->active ? '+' : ' ', |
0d69704a | 463 | client->driver_power_control ? "Dyn" : "", |
79721e0a TI |
464 | client->pwr_state ? "Pwr" : "Off", |
465 | pci_name(client->pdev)); | |
466 | i++; | |
6a9ee8af DA |
467 | } |
468 | mutex_unlock(&vgasr_mutex); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | static int vga_switcheroo_debugfs_open(struct inode *inode, struct file *file) | |
473 | { | |
474 | return single_open(file, vga_switcheroo_show, NULL); | |
475 | } | |
476 | ||
477 | static int vga_switchon(struct vga_switcheroo_client *client) | |
478 | { | |
0d69704a DA |
479 | if (client->driver_power_control) |
480 | return 0; | |
5cfb3c3a DA |
481 | if (vgasr_priv.handler->power_state) |
482 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON); | |
6a9ee8af | 483 | /* call the driver callback to turn on device */ |
26ec685f | 484 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
485 | client->pwr_state = VGA_SWITCHEROO_ON; |
486 | return 0; | |
487 | } | |
488 | ||
489 | static int vga_switchoff(struct vga_switcheroo_client *client) | |
490 | { | |
0d69704a DA |
491 | if (client->driver_power_control) |
492 | return 0; | |
6a9ee8af | 493 | /* call the driver callback to turn off device */ |
26ec685f | 494 | client->ops->set_gpu_state(client->pdev, VGA_SWITCHEROO_OFF); |
5cfb3c3a DA |
495 | if (vgasr_priv.handler->power_state) |
496 | vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF); | |
6a9ee8af DA |
497 | client->pwr_state = VGA_SWITCHEROO_OFF; |
498 | return 0; | |
499 | } | |
500 | ||
fa3e967f LW |
501 | static void set_audio_state(enum vga_switcheroo_client_id id, |
502 | enum vga_switcheroo_state state) | |
3e9e63db TI |
503 | { |
504 | struct vga_switcheroo_client *client; | |
505 | ||
506 | client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO); | |
507 | if (client && client->pwr_state != state) { | |
508 | client->ops->set_gpu_state(client->pdev, state); | |
509 | client->pwr_state = state; | |
510 | } | |
511 | } | |
512 | ||
66b37c67 DA |
513 | /* stage one happens before delay */ |
514 | static int vga_switchto_stage1(struct vga_switcheroo_client *new_client) | |
6a9ee8af | 515 | { |
79721e0a | 516 | struct vga_switcheroo_client *active; |
6a9ee8af | 517 | |
79721e0a | 518 | active = find_active_client(&vgasr_priv.clients); |
6a9ee8af DA |
519 | if (!active) |
520 | return 0; | |
521 | ||
6a9ee8af DA |
522 | if (new_client->pwr_state == VGA_SWITCHEROO_OFF) |
523 | vga_switchon(new_client); | |
524 | ||
2fbe8c7c | 525 | vga_set_default_device(new_client->pdev); |
66b37c67 DA |
526 | return 0; |
527 | } | |
528 | ||
529 | /* post delay */ | |
530 | static int vga_switchto_stage2(struct vga_switcheroo_client *new_client) | |
531 | { | |
532 | int ret; | |
79721e0a | 533 | struct vga_switcheroo_client *active; |
66b37c67 | 534 | |
79721e0a | 535 | active = find_active_client(&vgasr_priv.clients); |
66b37c67 DA |
536 | if (!active) |
537 | return 0; | |
538 | ||
539 | active->active = false; | |
6a9ee8af | 540 | |
c91c3fae TI |
541 | set_audio_state(active->id, VGA_SWITCHEROO_OFF); |
542 | ||
6a9ee8af DA |
543 | if (new_client->fb_info) { |
544 | struct fb_event event; | |
7491bfb4 | 545 | |
054430e7 | 546 | console_lock(); |
6a9ee8af DA |
547 | event.info = new_client->fb_info; |
548 | fb_notifier_call_chain(FB_EVENT_REMAP_ALL_CONSOLE, &event); | |
054430e7 | 549 | console_unlock(); |
6a9ee8af DA |
550 | } |
551 | ||
552 | ret = vgasr_priv.handler->switchto(new_client->id); | |
553 | if (ret) | |
554 | return ret; | |
555 | ||
26ec685f TI |
556 | if (new_client->ops->reprobe) |
557 | new_client->ops->reprobe(new_client->pdev); | |
8d608aa6 | 558 | |
6a9ee8af DA |
559 | if (active->pwr_state == VGA_SWITCHEROO_ON) |
560 | vga_switchoff(active); | |
561 | ||
c91c3fae TI |
562 | set_audio_state(new_client->id, VGA_SWITCHEROO_ON); |
563 | ||
6a9ee8af DA |
564 | new_client->active = true; |
565 | return 0; | |
566 | } | |
567 | ||
79721e0a TI |
568 | static bool check_can_switch(void) |
569 | { | |
570 | struct vga_switcheroo_client *client; | |
571 | ||
572 | list_for_each_entry(client, &vgasr_priv.clients, list) { | |
26ec685f | 573 | if (!client->ops->can_switch(client->pdev)) { |
9b0be1eb | 574 | pr_err("client %x refused switch\n", client->id); |
79721e0a TI |
575 | return false; |
576 | } | |
577 | } | |
578 | return true; | |
579 | } | |
580 | ||
6a9ee8af DA |
581 | static ssize_t |
582 | vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf, | |
583 | size_t cnt, loff_t *ppos) | |
584 | { | |
585 | char usercmd[64]; | |
79721e0a | 586 | int ret; |
6a9ee8af | 587 | bool delay = false, can_switch; |
851ab954 | 588 | bool just_mux = false; |
fa3e967f | 589 | enum vga_switcheroo_client_id client_id = VGA_SWITCHEROO_UNKNOWN_ID; |
6a9ee8af DA |
590 | struct vga_switcheroo_client *client = NULL; |
591 | ||
592 | if (cnt > 63) | |
593 | cnt = 63; | |
594 | ||
595 | if (copy_from_user(usercmd, ubuf, cnt)) | |
596 | return -EFAULT; | |
597 | ||
598 | mutex_lock(&vgasr_mutex); | |
599 | ||
8c88e50b JS |
600 | if (!vgasr_priv.active) { |
601 | cnt = -EINVAL; | |
602 | goto out; | |
603 | } | |
6a9ee8af DA |
604 | |
605 | /* pwr off the device not in use */ | |
606 | if (strncmp(usercmd, "OFF", 3) == 0) { | |
79721e0a | 607 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 608 | if (client->active || client_is_audio(client)) |
6a9ee8af | 609 | continue; |
0d69704a DA |
610 | if (client->driver_power_control) |
611 | continue; | |
c91c3fae | 612 | set_audio_state(client->id, VGA_SWITCHEROO_OFF); |
79721e0a TI |
613 | if (client->pwr_state == VGA_SWITCHEROO_ON) |
614 | vga_switchoff(client); | |
6a9ee8af DA |
615 | } |
616 | goto out; | |
617 | } | |
618 | /* pwr on the device not in use */ | |
619 | if (strncmp(usercmd, "ON", 2) == 0) { | |
79721e0a | 620 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
c91c3fae | 621 | if (client->active || client_is_audio(client)) |
6a9ee8af | 622 | continue; |
0d69704a DA |
623 | if (client->driver_power_control) |
624 | continue; | |
79721e0a TI |
625 | if (client->pwr_state == VGA_SWITCHEROO_OFF) |
626 | vga_switchon(client); | |
c91c3fae | 627 | set_audio_state(client->id, VGA_SWITCHEROO_ON); |
6a9ee8af DA |
628 | } |
629 | goto out; | |
630 | } | |
631 | ||
632 | /* request a delayed switch - test can we switch now */ | |
633 | if (strncmp(usercmd, "DIGD", 4) == 0) { | |
634 | client_id = VGA_SWITCHEROO_IGD; | |
635 | delay = true; | |
636 | } | |
637 | ||
638 | if (strncmp(usercmd, "DDIS", 4) == 0) { | |
639 | client_id = VGA_SWITCHEROO_DIS; | |
640 | delay = true; | |
641 | } | |
642 | ||
643 | if (strncmp(usercmd, "IGD", 3) == 0) | |
644 | client_id = VGA_SWITCHEROO_IGD; | |
645 | ||
646 | if (strncmp(usercmd, "DIS", 3) == 0) | |
647 | client_id = VGA_SWITCHEROO_DIS; | |
648 | ||
fea6f330 | 649 | if (strncmp(usercmd, "MIGD", 4) == 0) { |
851ab954 DA |
650 | just_mux = true; |
651 | client_id = VGA_SWITCHEROO_IGD; | |
652 | } | |
fea6f330 | 653 | if (strncmp(usercmd, "MDIS", 4) == 0) { |
851ab954 DA |
654 | just_mux = true; |
655 | client_id = VGA_SWITCHEROO_DIS; | |
656 | } | |
657 | ||
21c5ba8c | 658 | if (client_id == VGA_SWITCHEROO_UNKNOWN_ID) |
6a9ee8af | 659 | goto out; |
79721e0a TI |
660 | client = find_client_from_id(&vgasr_priv.clients, client_id); |
661 | if (!client) | |
662 | goto out; | |
6a9ee8af DA |
663 | |
664 | vgasr_priv.delayed_switch_active = false; | |
851ab954 DA |
665 | |
666 | if (just_mux) { | |
667 | ret = vgasr_priv.handler->switchto(client_id); | |
668 | goto out; | |
669 | } | |
670 | ||
79721e0a | 671 | if (client->active) |
a67b8887 FM |
672 | goto out; |
673 | ||
6a9ee8af | 674 | /* okay we want a switch - test if devices are willing to switch */ |
79721e0a | 675 | can_switch = check_can_switch(); |
6a9ee8af DA |
676 | |
677 | if (can_switch == false && delay == false) | |
678 | goto out; | |
679 | ||
79721e0a | 680 | if (can_switch) { |
66b37c67 DA |
681 | ret = vga_switchto_stage1(client); |
682 | if (ret) | |
9b0be1eb | 683 | pr_err("switching failed stage 1 %d\n", ret); |
66b37c67 DA |
684 | |
685 | ret = vga_switchto_stage2(client); | |
6a9ee8af | 686 | if (ret) |
9b0be1eb | 687 | pr_err("switching failed stage 2 %d\n", ret); |
66b37c67 | 688 | |
6a9ee8af | 689 | } else { |
9b0be1eb | 690 | pr_info("setting delayed switch to client %d\n", client->id); |
6a9ee8af DA |
691 | vgasr_priv.delayed_switch_active = true; |
692 | vgasr_priv.delayed_client_id = client_id; | |
693 | ||
66b37c67 DA |
694 | ret = vga_switchto_stage1(client); |
695 | if (ret) | |
9b0be1eb | 696 | pr_err("delayed switching stage 1 failed %d\n", ret); |
6a9ee8af DA |
697 | } |
698 | ||
699 | out: | |
700 | mutex_unlock(&vgasr_mutex); | |
701 | return cnt; | |
702 | } | |
703 | ||
704 | static const struct file_operations vga_switcheroo_debugfs_fops = { | |
705 | .owner = THIS_MODULE, | |
706 | .open = vga_switcheroo_debugfs_open, | |
707 | .write = vga_switcheroo_debugfs_write, | |
708 | .read = seq_read, | |
709 | .llseek = seq_lseek, | |
710 | .release = single_release, | |
711 | }; | |
712 | ||
713 | static void vga_switcheroo_debugfs_fini(struct vgasr_priv *priv) | |
714 | { | |
798ae0f6 TR |
715 | debugfs_remove(priv->switch_file); |
716 | priv->switch_file = NULL; | |
717 | ||
718 | debugfs_remove(priv->debugfs_root); | |
719 | priv->debugfs_root = NULL; | |
6a9ee8af DA |
720 | } |
721 | ||
722 | static int vga_switcheroo_debugfs_init(struct vgasr_priv *priv) | |
723 | { | |
9b0be1eb TR |
724 | static const char mp[] = "/sys/kernel/debug"; |
725 | ||
6a9ee8af DA |
726 | /* already initialised */ |
727 | if (priv->debugfs_root) | |
728 | return 0; | |
729 | priv->debugfs_root = debugfs_create_dir("vgaswitcheroo", NULL); | |
730 | ||
731 | if (!priv->debugfs_root) { | |
9b0be1eb | 732 | pr_err("Cannot create %s/vgaswitcheroo\n", mp); |
6a9ee8af DA |
733 | goto fail; |
734 | } | |
735 | ||
736 | priv->switch_file = debugfs_create_file("switch", 0644, | |
7491bfb4 TR |
737 | priv->debugfs_root, NULL, |
738 | &vga_switcheroo_debugfs_fops); | |
6a9ee8af | 739 | if (!priv->switch_file) { |
9b0be1eb | 740 | pr_err("cannot create %s/vgaswitcheroo/switch\n", mp); |
6a9ee8af DA |
741 | goto fail; |
742 | } | |
743 | return 0; | |
744 | fail: | |
745 | vga_switcheroo_debugfs_fini(priv); | |
746 | return -1; | |
747 | } | |
748 | ||
a645654b LW |
749 | /** |
750 | * vga_switcheroo_process_delayed_switch() - helper for delayed switching | |
751 | * | |
752 | * Process a delayed switch if one is pending. DRM drivers should call this | |
753 | * from their ->lastclose callback. | |
754 | * | |
755 | * Return: 0 on success. -EINVAL if no delayed switch is pending, if the client | |
756 | * has unregistered in the meantime or if there are other clients blocking the | |
757 | * switch. If the actual switch fails, an error is reported and 0 is returned. | |
758 | */ | |
6a9ee8af DA |
759 | int vga_switcheroo_process_delayed_switch(void) |
760 | { | |
79721e0a | 761 | struct vga_switcheroo_client *client; |
6a9ee8af DA |
762 | int ret; |
763 | int err = -EINVAL; | |
764 | ||
765 | mutex_lock(&vgasr_mutex); | |
766 | if (!vgasr_priv.delayed_switch_active) | |
767 | goto err; | |
768 | ||
9b0be1eb TR |
769 | pr_info("processing delayed switch to %d\n", |
770 | vgasr_priv.delayed_client_id); | |
6a9ee8af | 771 | |
79721e0a TI |
772 | client = find_client_from_id(&vgasr_priv.clients, |
773 | vgasr_priv.delayed_client_id); | |
774 | if (!client || !check_can_switch()) | |
6a9ee8af DA |
775 | goto err; |
776 | ||
66b37c67 | 777 | ret = vga_switchto_stage2(client); |
6a9ee8af | 778 | if (ret) |
9b0be1eb | 779 | pr_err("delayed switching failed stage 2 %d\n", ret); |
6a9ee8af DA |
780 | |
781 | vgasr_priv.delayed_switch_active = false; | |
782 | err = 0; | |
783 | err: | |
784 | mutex_unlock(&vgasr_mutex); | |
785 | return err; | |
786 | } | |
787 | EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch); | |
0d69704a | 788 | |
a645654b LW |
789 | /** |
790 | * DOC: Driver power control | |
791 | * | |
792 | * In this mode of use, the discrete GPU automatically powers up and down at | |
793 | * the discretion of the driver's runtime pm. On muxed machines, the user may | |
794 | * still influence the muxer state by way of the debugfs interface, however | |
795 | * the ON and OFF commands become a no-op for the discrete GPU. | |
796 | * | |
797 | * This mode is the default on Nvidia HybridPower/Optimus and ATI PowerXpress. | |
798 | * Specifying nouveau.runpm=0, radeon.runpm=0 or amdgpu.runpm=0 on the kernel | |
799 | * command line disables it. | |
800 | * | |
801 | * When the driver decides to power up or down, it notifies vga_switcheroo | |
802 | * thereof so that it can (a) power the audio device on the GPU up or down, | |
803 | * and (b) update its internal power state representation for the device. | |
804 | * This is achieved by vga_switcheroo_set_dynamic_switch(). | |
805 | * | |
806 | * After the GPU has been suspended, the handler needs to be called to cut | |
807 | * power to the GPU. Likewise it needs to reinstate power before the GPU | |
808 | * can resume. This is achieved by vga_switcheroo_init_domain_pm_ops(), | |
809 | * which augments the GPU's suspend/resume functions by the requisite | |
810 | * calls to the handler. | |
811 | * | |
812 | * When the audio device resumes, the GPU needs to be woken. This is achieved | |
813 | * by vga_switcheroo_init_domain_pm_optimus_hdmi_audio(), which augments the | |
814 | * audio device's resume function. | |
815 | * | |
816 | * On muxed machines, if the mux is initially switched to the discrete GPU, | |
817 | * the user ends up with a black screen when the GPU powers down after boot. | |
818 | * As a workaround, the mux is forced to the integrated GPU on runtime suspend, | |
819 | * cf. https://bugs.freedesktop.org/show_bug.cgi?id=75917 | |
820 | */ | |
821 | ||
7491bfb4 TR |
822 | static void vga_switcheroo_power_switch(struct pci_dev *pdev, |
823 | enum vga_switcheroo_state state) | |
0d69704a DA |
824 | { |
825 | struct vga_switcheroo_client *client; | |
826 | ||
827 | if (!vgasr_priv.handler->power_state) | |
828 | return; | |
829 | ||
830 | client = find_client_from_pci(&vgasr_priv.clients, pdev); | |
831 | if (!client) | |
832 | return; | |
833 | ||
834 | if (!client->driver_power_control) | |
835 | return; | |
836 | ||
837 | vgasr_priv.handler->power_state(client->id, state); | |
838 | } | |
839 | ||
a645654b LW |
840 | /** |
841 | * vga_switcheroo_set_dynamic_switch() - helper for driver power control | |
842 | * @pdev: client pci device | |
843 | * @dynamic: new power state | |
844 | * | |
845 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
846 | * When the driver decides to power up or down, it notifies vga_switcheroo | |
847 | * thereof using this helper so that it can (a) power the audio device on | |
848 | * the GPU up or down, and (b) update its internal power state representation | |
849 | * for the device. | |
850 | */ | |
7491bfb4 TR |
851 | void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, |
852 | enum vga_switcheroo_state dynamic) | |
0d69704a DA |
853 | { |
854 | struct vga_switcheroo_client *client; | |
855 | ||
8f12a311 | 856 | mutex_lock(&vgasr_mutex); |
0d69704a | 857 | client = find_client_from_pci(&vgasr_priv.clients, pdev); |
8f12a311 LW |
858 | if (!client || !client->driver_power_control) { |
859 | mutex_unlock(&vgasr_mutex); | |
0d69704a | 860 | return; |
8f12a311 | 861 | } |
0d69704a DA |
862 | |
863 | client->pwr_state = dynamic; | |
864 | set_audio_state(client->id, dynamic); | |
8f12a311 | 865 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
866 | } |
867 | EXPORT_SYMBOL(vga_switcheroo_set_dynamic_switch); | |
868 | ||
869 | /* switcheroo power domain */ | |
870 | static int vga_switcheroo_runtime_suspend(struct device *dev) | |
871 | { | |
872 | struct pci_dev *pdev = to_pci_dev(dev); | |
873 | int ret; | |
874 | ||
875 | ret = dev->bus->pm->runtime_suspend(dev); | |
876 | if (ret) | |
877 | return ret; | |
8f12a311 | 878 | mutex_lock(&vgasr_mutex); |
f2bc5616 AD |
879 | if (vgasr_priv.handler->switchto) |
880 | vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD); | |
0d69704a | 881 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_OFF); |
8f12a311 | 882 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
883 | return 0; |
884 | } | |
885 | ||
886 | static int vga_switcheroo_runtime_resume(struct device *dev) | |
887 | { | |
888 | struct pci_dev *pdev = to_pci_dev(dev); | |
889 | int ret; | |
890 | ||
8f12a311 | 891 | mutex_lock(&vgasr_mutex); |
0d69704a | 892 | vga_switcheroo_power_switch(pdev, VGA_SWITCHEROO_ON); |
8f12a311 | 893 | mutex_unlock(&vgasr_mutex); |
0d69704a DA |
894 | ret = dev->bus->pm->runtime_resume(dev); |
895 | if (ret) | |
896 | return ret; | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
a645654b LW |
901 | /** |
902 | * vga_switcheroo_init_domain_pm_ops() - helper for driver power control | |
903 | * @dev: vga client device | |
904 | * @domain: power domain | |
905 | * | |
906 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
907 | * After the GPU has been suspended, the handler needs to be called to cut | |
908 | * power to the GPU. Likewise it needs to reinstate power before the GPU | |
909 | * can resume. To this end, this helper augments the suspend/resume functions | |
910 | * by the requisite calls to the handler. It needs only be called on platforms | |
911 | * where the power switch is separate to the device being powered down. | |
912 | */ | |
7491bfb4 TR |
913 | int vga_switcheroo_init_domain_pm_ops(struct device *dev, |
914 | struct dev_pm_domain *domain) | |
0d69704a DA |
915 | { |
916 | /* copy over all the bus versions */ | |
917 | if (dev->bus && dev->bus->pm) { | |
918 | domain->ops = *dev->bus->pm; | |
919 | domain->ops.runtime_suspend = vga_switcheroo_runtime_suspend; | |
920 | domain->ops.runtime_resume = vga_switcheroo_runtime_resume; | |
921 | ||
989561de | 922 | dev_pm_domain_set(dev, domain); |
0d69704a DA |
923 | return 0; |
924 | } | |
989561de | 925 | dev_pm_domain_set(dev, NULL); |
0d69704a DA |
926 | return -EINVAL; |
927 | } | |
928 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_ops); | |
929 | ||
766a53d0 AD |
930 | void vga_switcheroo_fini_domain_pm_ops(struct device *dev) |
931 | { | |
989561de | 932 | dev_pm_domain_set(dev, NULL); |
766a53d0 AD |
933 | } |
934 | EXPORT_SYMBOL(vga_switcheroo_fini_domain_pm_ops); | |
935 | ||
0d69704a DA |
936 | static int vga_switcheroo_runtime_resume_hdmi_audio(struct device *dev) |
937 | { | |
938 | struct pci_dev *pdev = to_pci_dev(dev); | |
8f12a311 LW |
939 | struct vga_switcheroo_client *client; |
940 | struct device *video_dev = NULL; | |
0d69704a | 941 | int ret; |
0d69704a DA |
942 | |
943 | /* we need to check if we have to switch back on the video | |
944 | device so the audio device can come back */ | |
8f12a311 | 945 | mutex_lock(&vgasr_mutex); |
0d69704a | 946 | list_for_each_entry(client, &vgasr_priv.clients, list) { |
7491bfb4 TR |
947 | if (PCI_SLOT(client->pdev->devfn) == PCI_SLOT(pdev->devfn) && |
948 | client_is_vga(client)) { | |
8f12a311 | 949 | video_dev = &client->pdev->dev; |
0d69704a DA |
950 | break; |
951 | } | |
952 | } | |
8f12a311 LW |
953 | mutex_unlock(&vgasr_mutex); |
954 | ||
955 | if (video_dev) { | |
956 | ret = pm_runtime_get_sync(video_dev); | |
957 | if (ret && ret != 1) | |
958 | return ret; | |
959 | } | |
0d69704a DA |
960 | ret = dev->bus->pm->runtime_resume(dev); |
961 | ||
962 | /* put the reference for the gpu */ | |
8f12a311 LW |
963 | if (video_dev) { |
964 | pm_runtime_mark_last_busy(video_dev); | |
965 | pm_runtime_put_autosuspend(video_dev); | |
0d69704a DA |
966 | } |
967 | return ret; | |
968 | } | |
969 | ||
a645654b LW |
970 | /** |
971 | * vga_switcheroo_init_domain_pm_optimus_hdmi_audio() - helper for driver | |
972 | * power control | |
973 | * @dev: audio client device | |
974 | * @domain: power domain | |
975 | * | |
976 | * Helper for GPUs whose power state is controlled by the driver's runtime pm. | |
977 | * When the audio device resumes, the GPU needs to be woken. This helper | |
978 | * augments the audio device's resume function to do that. | |
979 | * | |
980 | * Return: 0 on success, -EINVAL if no power management operations are | |
981 | * defined for this device. | |
982 | */ | |
7491bfb4 TR |
983 | int |
984 | vga_switcheroo_init_domain_pm_optimus_hdmi_audio(struct device *dev, | |
985 | struct dev_pm_domain *domain) | |
0d69704a DA |
986 | { |
987 | /* copy over all the bus versions */ | |
988 | if (dev->bus && dev->bus->pm) { | |
989 | domain->ops = *dev->bus->pm; | |
7491bfb4 TR |
990 | domain->ops.runtime_resume = |
991 | vga_switcheroo_runtime_resume_hdmi_audio; | |
0d69704a | 992 | |
989561de | 993 | dev_pm_domain_set(dev, domain); |
0d69704a DA |
994 | return 0; |
995 | } | |
989561de | 996 | dev_pm_domain_set(dev, NULL); |
0d69704a DA |
997 | return -EINVAL; |
998 | } | |
999 | EXPORT_SYMBOL(vga_switcheroo_init_domain_pm_optimus_hdmi_audio); |