Merge remote-tracking branch 'torvalds/master' into perf/core
[linux-2.6-microblaze.git] / sound / soc / sof / pm.c
1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2 //
3 // This file is provided under a dual BSD/GPLv2 license.  When using or
4 // redistributing this file, you may do so under either license.
5 //
6 // Copyright(c) 2018 Intel Corporation. All rights reserved.
7 //
8 // Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
9 //
10
11 #include "ops.h"
12 #include "sof-priv.h"
13 #include "sof-audio.h"
14
15 /*
16  * Helper function to determine the target DSP state during
17  * system suspend. This function only cares about the device
18  * D-states. Platform-specific substates, if any, should be
19  * handled by the platform-specific parts.
20  */
21 static u32 snd_sof_dsp_power_target(struct snd_sof_dev *sdev)
22 {
23         u32 target_dsp_state;
24
25         switch (sdev->system_suspend_target) {
26         case SOF_SUSPEND_S3:
27                 /* DSP should be in D3 if the system is suspending to S3 */
28                 target_dsp_state = SOF_DSP_PM_D3;
29                 break;
30         case SOF_SUSPEND_S0IX:
31                 /*
32                  * Currently, the only criterion for retaining the DSP in D0
33                  * is that there are streams that ignored the suspend trigger.
34                  * Additional criteria such Soundwire clock-stop mode and
35                  * device suspend latency considerations will be added later.
36                  */
37                 if (snd_sof_stream_suspend_ignored(sdev))
38                         target_dsp_state = SOF_DSP_PM_D0;
39                 else
40                         target_dsp_state = SOF_DSP_PM_D3;
41                 break;
42         default:
43                 /* This case would be during runtime suspend */
44                 target_dsp_state = SOF_DSP_PM_D3;
45                 break;
46         }
47
48         return target_dsp_state;
49 }
50
51 static int sof_send_pm_ctx_ipc(struct snd_sof_dev *sdev, int cmd)
52 {
53         struct sof_ipc_pm_ctx pm_ctx;
54         struct sof_ipc_reply reply;
55
56         memset(&pm_ctx, 0, sizeof(pm_ctx));
57
58         /* configure ctx save ipc message */
59         pm_ctx.hdr.size = sizeof(pm_ctx);
60         pm_ctx.hdr.cmd = SOF_IPC_GLB_PM_MSG | cmd;
61
62         /* send ctx save ipc to dsp */
63         return sof_ipc_tx_message(sdev->ipc, pm_ctx.hdr.cmd, &pm_ctx,
64                                  sizeof(pm_ctx), &reply, sizeof(reply));
65 }
66
67 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
68 static void sof_cache_debugfs(struct snd_sof_dev *sdev)
69 {
70         struct snd_sof_dfsentry *dfse;
71
72         list_for_each_entry(dfse, &sdev->dfsentry_list, list) {
73
74                 /* nothing to do if debugfs buffer is not IO mem */
75                 if (dfse->type == SOF_DFSENTRY_TYPE_BUF)
76                         continue;
77
78                 /* cache memory that is only accessible in D0 */
79                 if (dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY)
80                         memcpy_fromio(dfse->cache_buf, dfse->io_mem,
81                                       dfse->size);
82         }
83 }
84 #endif
85
86 static int sof_resume(struct device *dev, bool runtime_resume)
87 {
88         struct snd_sof_dev *sdev = dev_get_drvdata(dev);
89         u32 old_state = sdev->dsp_power_state.state;
90         int ret;
91
92         /* do nothing if dsp resume callbacks are not set */
93         if (!runtime_resume && !sof_ops(sdev)->resume)
94                 return 0;
95
96         if (runtime_resume && !sof_ops(sdev)->runtime_resume)
97                 return 0;
98
99         /* DSP was never successfully started, nothing to resume */
100         if (sdev->first_boot)
101                 return 0;
102
103         /*
104          * if the runtime_resume flag is set, call the runtime_resume routine
105          * or else call the system resume routine
106          */
107         if (runtime_resume)
108                 ret = snd_sof_dsp_runtime_resume(sdev);
109         else
110                 ret = snd_sof_dsp_resume(sdev);
111         if (ret < 0) {
112                 dev_err(sdev->dev,
113                         "error: failed to power up DSP after resume\n");
114                 return ret;
115         }
116
117         /*
118          * Nothing further to be done for platforms that support the low power
119          * D0 substate.
120          */
121         if (!runtime_resume && sof_ops(sdev)->set_power_state &&
122             old_state == SOF_DSP_PM_D0)
123                 return 0;
124
125         sdev->fw_state = SOF_FW_BOOT_PREPARE;
126
127         /* load the firmware */
128         ret = snd_sof_load_firmware(sdev);
129         if (ret < 0) {
130                 dev_err(sdev->dev,
131                         "error: failed to load DSP firmware after resume %d\n",
132                         ret);
133                 return ret;
134         }
135
136         sdev->fw_state = SOF_FW_BOOT_IN_PROGRESS;
137
138         /*
139          * Boot the firmware. The FW boot status will be modified
140          * in snd_sof_run_firmware() depending on the outcome.
141          */
142         ret = snd_sof_run_firmware(sdev);
143         if (ret < 0) {
144                 dev_err(sdev->dev,
145                         "error: failed to boot DSP firmware after resume %d\n",
146                         ret);
147                 return ret;
148         }
149
150         /* resume DMA trace, only need send ipc */
151         ret = snd_sof_init_trace_ipc(sdev);
152         if (ret < 0) {
153                 /* non fatal */
154                 dev_warn(sdev->dev,
155                          "warning: failed to init trace after resume %d\n",
156                          ret);
157         }
158
159         /* restore pipelines */
160         ret = sof_restore_pipelines(sdev->dev);
161         if (ret < 0) {
162                 dev_err(sdev->dev,
163                         "error: failed to restore pipeline after resume %d\n",
164                         ret);
165                 return ret;
166         }
167
168         /* notify DSP of system resume */
169         ret = sof_send_pm_ctx_ipc(sdev, SOF_IPC_PM_CTX_RESTORE);
170         if (ret < 0)
171                 dev_err(sdev->dev,
172                         "error: ctx_restore ipc error during resume %d\n",
173                         ret);
174
175         return ret;
176 }
177
178 static int sof_suspend(struct device *dev, bool runtime_suspend)
179 {
180         struct snd_sof_dev *sdev = dev_get_drvdata(dev);
181         u32 target_state = 0;
182         int ret;
183
184         /* do nothing if dsp suspend callback is not set */
185         if (!runtime_suspend && !sof_ops(sdev)->suspend)
186                 return 0;
187
188         if (runtime_suspend && !sof_ops(sdev)->runtime_suspend)
189                 return 0;
190
191         if (sdev->fw_state != SOF_FW_BOOT_COMPLETE)
192                 goto suspend;
193
194         /* set restore_stream for all streams during system suspend */
195         if (!runtime_suspend) {
196                 ret = sof_set_hw_params_upon_resume(sdev->dev);
197                 if (ret < 0) {
198                         dev_err(sdev->dev,
199                                 "error: setting hw_params flag during suspend %d\n",
200                                 ret);
201                         return ret;
202                 }
203         }
204
205         target_state = snd_sof_dsp_power_target(sdev);
206
207         /* Skip to platform-specific suspend if DSP is entering D0 */
208         if (target_state == SOF_DSP_PM_D0)
209                 goto suspend;
210
211         /* release trace */
212         snd_sof_release_trace(sdev);
213
214 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
215         /* cache debugfs contents during runtime suspend */
216         if (runtime_suspend)
217                 sof_cache_debugfs(sdev);
218 #endif
219         /* notify DSP of upcoming power down */
220         ret = sof_send_pm_ctx_ipc(sdev, SOF_IPC_PM_CTX_SAVE);
221         if (ret == -EBUSY || ret == -EAGAIN) {
222                 /*
223                  * runtime PM has logic to handle -EBUSY/-EAGAIN so
224                  * pass these errors up
225                  */
226                 dev_err(sdev->dev,
227                         "error: ctx_save ipc error during suspend %d\n",
228                         ret);
229                 return ret;
230         } else if (ret < 0) {
231                 /* FW in unexpected state, continue to power down */
232                 dev_warn(sdev->dev,
233                          "ctx_save ipc error %d, proceeding with suspend\n",
234                          ret);
235         }
236
237 suspend:
238
239         /* return if the DSP was not probed successfully */
240         if (sdev->fw_state == SOF_FW_BOOT_NOT_STARTED)
241                 return 0;
242
243         /* platform-specific suspend */
244         if (runtime_suspend)
245                 ret = snd_sof_dsp_runtime_suspend(sdev);
246         else
247                 ret = snd_sof_dsp_suspend(sdev, target_state);
248         if (ret < 0)
249                 dev_err(sdev->dev,
250                         "error: failed to power down DSP during suspend %d\n",
251                         ret);
252
253         /* Do not reset FW state if DSP is in D0 */
254         if (target_state == SOF_DSP_PM_D0)
255                 return ret;
256
257         /* reset FW state */
258         sdev->fw_state = SOF_FW_BOOT_NOT_STARTED;
259         sdev->enabled_cores_mask = 0;
260
261         return ret;
262 }
263
264 int snd_sof_dsp_power_down_notify(struct snd_sof_dev *sdev)
265 {
266         /* Notify DSP of upcoming power down */
267         if (sof_ops(sdev)->remove)
268                 return sof_send_pm_ctx_ipc(sdev, SOF_IPC_PM_CTX_SAVE);
269
270         return 0;
271 }
272
273 int snd_sof_runtime_suspend(struct device *dev)
274 {
275         return sof_suspend(dev, true);
276 }
277 EXPORT_SYMBOL(snd_sof_runtime_suspend);
278
279 int snd_sof_runtime_idle(struct device *dev)
280 {
281         struct snd_sof_dev *sdev = dev_get_drvdata(dev);
282
283         return snd_sof_dsp_runtime_idle(sdev);
284 }
285 EXPORT_SYMBOL(snd_sof_runtime_idle);
286
287 int snd_sof_runtime_resume(struct device *dev)
288 {
289         return sof_resume(dev, true);
290 }
291 EXPORT_SYMBOL(snd_sof_runtime_resume);
292
293 int snd_sof_resume(struct device *dev)
294 {
295         return sof_resume(dev, false);
296 }
297 EXPORT_SYMBOL(snd_sof_resume);
298
299 int snd_sof_suspend(struct device *dev)
300 {
301         return sof_suspend(dev, false);
302 }
303 EXPORT_SYMBOL(snd_sof_suspend);
304
305 int snd_sof_prepare(struct device *dev)
306 {
307         struct snd_sof_dev *sdev = dev_get_drvdata(dev);
308         const struct sof_dev_desc *desc = sdev->pdata->desc;
309
310         /* will suspend to S3 by default */
311         sdev->system_suspend_target = SOF_SUSPEND_S3;
312
313         if (!desc->use_acpi_target_states)
314                 return 0;
315
316 #if defined(CONFIG_ACPI)
317         if (acpi_target_system_state() == ACPI_STATE_S0)
318                 sdev->system_suspend_target = SOF_SUSPEND_S0IX;
319 #endif
320
321         return 0;
322 }
323 EXPORT_SYMBOL(snd_sof_prepare);
324
325 void snd_sof_complete(struct device *dev)
326 {
327         struct snd_sof_dev *sdev = dev_get_drvdata(dev);
328
329         sdev->system_suspend_target = SOF_SUSPEND_NONE;
330 }
331 EXPORT_SYMBOL(snd_sof_complete);