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