FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-17 06:17:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

ASoC: Hold runtime PM references to components of active DAIs

Browse Source 
Every device that implements runtime power management for DAIs is doing
it in pretty much the same way: in the startup callback they take a
runtime PM reference and then in the shutdown callback they release that
reference, keeping the device active while the DAI is active. Given the
frequency with which this is done and the obviousness of the need to keep
the device active in this period factor the code out into the core, taking
references on the device for each CPU DAI, CODEC DAI and DMA device in the
core.

As runtime PM is reference counted this shouldn't interfere with any
other reference holding by the drivers, and since (in common with the
existing implementations) we don't check for errors on enabling it
shouldn't matter if the device actually has runtime PM enabled or not.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
This commit is contained in:
Mark Brown 2011-12-03 20:14:31 +00:00
parent bf4df93593
commit d6652ef822
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
sound/soc/soc-pcm.c
View File

@ -19,6 +19,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/workqueue.h> #include <linux/workqueue.h>
#include <sound/core.h> #include <sound/core.h>
@ -77,6 +78,10 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver; struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
int ret = 0; int ret = 0;
pm_runtime_get_sync(cpu_dai->dev);
pm_runtime_get_sync(codec_dai->dev);
pm_runtime_get_sync(platform->dev);
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass); mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
/* startup the audio subsystem */ /* startup the audio subsystem */
@ -233,6 +238,11 @@ platform_err:
cpu_dai->driver->ops->shutdown(substream, cpu_dai); cpu_dai->driver->ops->shutdown(substream, cpu_dai);
out: out:
mutex_unlock(&rtd->pcm_mutex); mutex_unlock(&rtd->pcm_mutex);
pm_runtime_put(platform->dev);
pm_runtime_put(codec_dai->dev);
pm_runtime_put(cpu_dai->dev);
return ret; return ret;
} }
@ -339,6 +349,11 @@ static int soc_pcm_close(struct snd_pcm_substream *substream)
} }
mutex_unlock(&rtd->pcm_mutex); mutex_unlock(&rtd->pcm_mutex);
pm_runtime_put(platform->dev);
pm_runtime_put(codec_dai->dev);
pm_runtime_put(cpu_dai->dev);
return 0; return 0;
} }