2020-06-12 07:51:02

by Shengjiu Wang

Subject: [RFC PATCH v3 1/4] ASoC: soc-card: export snd_soc_lookup_component_nolocked

snd_soc_lookup_component_nolocked can be used for the DPCM case
that Front-End needs to get the unused platform component but
added by Back-End cpu dai driver.

If the component is gotten, then we can get the dma chan created
by Back-End component and reused it in Front-End.

Signed-off-by: Shengjiu Wang <[email protected]>
---
include/sound/soc.h | 2 ++
sound/soc/soc-core.c | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 74868436ac79..565612a8d690 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -444,6 +444,8 @@ int devm_snd_soc_register_component(struct device *dev,
const struct snd_soc_component_driver *component_driver,
struct snd_soc_dai_driver *dai_drv, int num_dai);
void snd_soc_unregister_component(struct device *dev);
+struct snd_soc_component *snd_soc_lookup_component_nolocked(struct device *dev,
+ const char *driver_name);
struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
const char *driver_name);

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index b07eca2c6ccc..d4c73e86d058 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -310,7 +310,7 @@ struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
}
EXPORT_SYMBOL_GPL(snd_soc_rtdcom_lookup);

-static struct snd_soc_component
+struct snd_soc_component
*snd_soc_lookup_component_nolocked(struct device *dev, const char *driver_name)
{
struct snd_soc_component *component;
@@ -329,6 +329,7 @@ static struct snd_soc_component

return found_component;
}
+EXPORT_SYMBOL_GPL(snd_soc_lookup_component_nolocked);

struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
const char *driver_name)
--
2.21.0

2020-06-12 08:03:01

by Nicolin Chen

Subject: Re: [RFC PATCH v3 1/4] ASoC: soc-card: export snd_soc_lookup_component_nolocked

On Fri, Jun 12, 2020 at 03:37:48PM +0800, Shengjiu Wang wrote:
> snd_soc_lookup_component_nolocked can be used for the DPCM case
> that Front-End needs to get the unused platform component but
> added by Back-End cpu dai driver.
>
> If the component is gotten, then we can get the dma chan created
> by Back-End component and reused it in Front-End.
>
> Signed-off-by: Shengjiu Wang <[email protected]>

Reviewed-by: Nicolin Chen <[email protected]>