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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 /sound/core
parentbfeffd155283772bbe78c6a05dec7c0128ee500c (diff)
downloadlinux-3d21ef0b49f84d3341984caafc5c658739674927.tar.bz2
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 'sound/core')
-rw-r--r--sound/core/pcm.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 01b9d62eef14..ca1ea3cf9350 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -683,6 +683,31 @@ static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substrea
static const struct attribute_group *pcm_dev_attr_groups[];
+/*
+ * PM callbacks: we need to deal only with suspend here, as the resume is
+ * triggered either from user-space or the driver's resume callback
+ */
+#ifdef CONFIG_PM_SLEEP
+static int do_pcm_suspend(struct device *dev)
+{
+ struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
+
+ if (!pstr->pcm->no_device_suspend)
+ snd_pcm_suspend_all(pstr->pcm);
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops pcm_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
+};
+
+/* device type for PCM -- basically only for passing PM callbacks */
+static const struct device_type pcm_dev_type = {
+ .name = "pcm",
+ .pm = &pcm_dev_pm_ops,
+};
+
/**
* snd_pcm_new_stream - create a new PCM stream
* @pcm: the pcm instance
@@ -713,6 +738,7 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
snd_device_initialize(&pstr->dev, pcm->card);
pstr->dev.groups = pcm_dev_attr_groups;
+ pstr->dev.type = &pcm_dev_type;
dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');