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authorTakashi Iwai <tiwai@suse.de>2019-01-11 15:58:39 +0100
committerTakashi Iwai <tiwai@suse.de>2019-01-15 17:46:36 +0100
commit3d21ef0b49f84d3341984caafc5c658739674927 (patch)
tree6af726a82265963dbebb22b360f66a7befdd6ca8 /include/sound
parentLinux 5.0-rc1 (diff)
downloadlinux-dev-3d21ef0b49f84d3341984caafc5c658739674927.tar.xz
linux-dev-3d21ef0b49f84d3341984caafc5c658739674927.zip
ALSA: pcm: Suspend streams globally via device type PM ops
Until now we rely on each driver calling snd_pcm_suspend*() explicitly at its own PM handling. However, this can be done far more easily by setting the PM ops to each actual snd_pcm device object. This patch adds the device_type object for PCM stream and assigns to each PCM stream object. The type contains only the PM ops for system suspend; we don't need to deal with the resume in general. The suspend hook simply calls snd_pcm_suspend_all() for the given PCM streams. This implies that the PM order is correctly put, i.e. PCM is suspended before the main (or codec) driver, which should be true in general. If a special ordering is needed, you'd need to adjust the device PM order manually later. This patch introduces a new flag, snd_pcm.no_device_suspend, too. With this flag set, the PCM device object won't invoke snd_pcm_suspend_all() by itself. This is needed for ASoC who wants to manage the PM call orders in its serialized way, and the flag is set in soc_new_pcm() as default. For the non-ASoC world, we can get rid of the manual snd_pcm_suspend calls. This will be done in the later patches. Reviewed-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/pcm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index d6bd3caf6878..04e97564949c 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -538,6 +538,7 @@ struct snd_pcm {
void (*private_free) (struct snd_pcm *pcm);
bool internal; /* pcm is for internal use only */
bool nonatomic; /* whole PCM operations are in non-atomic context */
+ bool no_device_suspend; /* don't invoke device PM suspend */
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
struct snd_pcm_oss oss;
#endif