diff mbox

[1/3] ASoC: Drop SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME flag

Message ID 1477392991-10604-1-git-send-email-s.nawrocki@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sylwester Nawrocki/Kernel \(PLT\) /SRPOL/Staff Engineer/Samsung Electronics Oct. 25, 2016, 10:56 a.m. UTC 
Since commit 194c7dea00c68c1b1f8ff26304fa937a006f66dd
"ASoC: dmaengine: add custom DMA config to snd_dmaengine_pcm_config"
custom DMA channels can be also specified in chan_names[] field of
struct snd_dmaengine_pcm_config.  This patch drops chan_name field
of struct snd_dmaengine_dai_dma_data and makes soc-generic-dmaengine-pcm
module using config->chan_names instead.  Remaining users of struct
snd_dmaengine_dai_dma_data::chan_name are updated to not require
that field.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
 include/sound/dmaengine_pcm.h         |  6 ------
 sound/soc/samsung/dmaengine.c         |  8 ++------
 sound/soc/samsung/i2s.c               |  3 ---
 sound/soc/samsung/s3c2412-i2s.c       |  2 --
 sound/soc/samsung/s3c24xx-i2s.c       |  2 --
 sound/soc/soc-generic-dmaengine-pcm.c | 12 +++---------
 6 files changed, 5 insertions(+), 28 deletions(-)

Comments

Lars-Peter Clausen Oct. 25, 2016, 12:22 p.m. UTC | #1 
On 10/25/2016 12:56 PM, Sylwester Nawrocki wrote:
> Since commit 194c7dea00c68c1b1f8ff26304fa937a006f66dd
> "ASoC: dmaengine: add custom DMA config to snd_dmaengine_pcm_config"
> custom DMA channels can be also specified in chan_names[] field of
> struct snd_dmaengine_pcm_config.  This patch drops chan_name field
> of struct snd_dmaengine_dai_dma_data and makes soc-generic-dmaengine-pcm
> module using config->chan_names instead.  Remaining users of struct
> snd_dmaengine_dai_dma_data::chan_name are updated to not require
> that field.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Nice patch. One nice-to-have change request, can you split this into two
patches, one which removes the last users and one patch which removes
support for it from the framework?

Having the new DMA map framework should also allow us to eventually remove
the channel request in dmaengine_pcm_new() once all users of filter
functions have gone.

[...]
> diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
> index 6cef397..f2d372d 100644
> --- a/sound/soc/soc-generic-dmaengine-pcm.c
> +++ b/sound/soc/soc-generic-dmaengine-pcm.c
> @@ -263,7 +263,6 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
>  	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
>  	const struct snd_dmaengine_pcm_config *config = pcm->config;
>  	struct device *dev = rtd->platform->dev;
> -	struct snd_dmaengine_dai_dma_data *dma_data;
>  	struct snd_pcm_substream *substream;
>  	size_t prealloc_buffer_size;
>  	size_t max_buffer_size;
> @@ -284,12 +283,9 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
>  		if (!substream)
>  			continue;
>  
> -		dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
> -
> -		if (!pcm->chan[i] &&
> -		    (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
> +		if (!pcm->chan[i] && config->chan_names[i])
>  			pcm->chan[i] = dma_request_slave_channel(dev,
> -				dma_data->chan_name);
> +				config->chan_names[i]);

I think this can be removed altogether. The only reason why we did the
delayed request is because the name would have not been available when
initially trying to request the channel when the PCM device is registered.

>  
>  		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
>  			pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
> @@ -359,9 +355,7 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
>  	const char *name;
>  	struct dma_chan *chan;
>  
> -	if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
> -			   SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
> -	    !dev->of_node)
> +	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node)
>  		return 0;
>  
>  	if (config && config->dma_dev) {
>
Sylwester Nawrocki/Kernel \(PLT\) /SRPOL/Staff Engineer/Samsung Electronics Oct. 25, 2016, 1:39 p.m. UTC | #2 
On 10/25/2016 02:22 PM, Lars-Peter Clausen wrote:
> On 10/25/2016 12:56 PM, Sylwester Nawrocki wrote:
<...>
> Nice patch. One nice-to-have change request, can you split this into two
> patches, one which removes the last users and one patch which removes
> support for it from the framework?

OK, I've made such split, looks cleaner this way indeed.

> Having the new DMA map framework should also allow us to eventually remove
> the channel request in dmaengine_pcm_new() once all users of filter
> functions have gone.

I've started working on removing all DMA filter uses from sound/soc/samsung,
hopefully it's ready in coming or next kernel release.  I need to add couple
more DMA map tables and support for DMA slave map to the PL080 controller.

> [...]
>> @@ -284,12 +283,9 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
>>  		if (!substream)
>>  			continue;
>>  
>> -		dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
>> -
>> -		if (!pcm->chan[i] &&
>> -		    (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
>> +		if (!pcm->chan[i] && config->chan_names[i])
>>  			pcm->chan[i] = dma_request_slave_channel(dev,
>> -				dma_data->chan_name);
>> +				config->chan_names[i]);
> 
> I think this can be removed altogether. The only reason why we did the
> delayed request is because the name would have not been available when
> initially trying to request the channel when the PCM device is registered.

Thanks for the hint, I will remove that call in v2.  I suspected it might
not be necessary any more but was afraid a bit of introducing a breakage.

Now the patch will be basically a revert of

commit ea73b7ddf13548afd666373dc5e26ee7c812a3fe
ASoC: dmaengine: Support custom channel names
diff mbox

Patch

diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index 67be244..1c8f9e1 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -71,7 +71,6 @@  struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
  * @slave_id: Slave requester id for the DMA channel.
  * @filter_data: Custom DMA channel filter data, this will usually be used when
  * requesting the DMA channel.
- * @chan_name: Custom channel name to use when requesting DMA channel.
  * @fifo_size: FIFO size of the DAI controller in bytes
  * @flags: PCM_DAI flags, only SND_DMAENGINE_PCM_DAI_FLAG_PACK for now
  */
@@ -81,7 +80,6 @@  struct snd_dmaengine_dai_dma_data {
 	u32 maxburst;
 	unsigned int slave_id;
 	void *filter_data;
-	const char *chan_name;
 	unsigned int fifo_size;
 	unsigned int flags;
 };
@@ -107,10 +105,6 @@  void snd_dmaengine_pcm_set_config_from_dai_data(
  * playback.
  */
 #define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
-/*
- * The PCM streams have custom channel names specified.
- */
-#define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4)
 
 /**
  * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
diff --git a/sound/soc/samsung/dmaengine.c b/sound/soc/samsung/dmaengine.c
index 9104c98..cda656e 100644
--- a/sound/soc/samsung/dmaengine.c
+++ b/sound/soc/samsung/dmaengine.c
@@ -37,12 +37,8 @@  int samsung_asoc_dma_platform_register(struct device *dev, dma_filter_fn filter,
 	pcm_conf->prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
 	pcm_conf->compat_filter_fn = filter;
 
-	if (dev->of_node) {
-		pcm_conf->chan_names[SNDRV_PCM_STREAM_PLAYBACK] = tx;
-		pcm_conf->chan_names[SNDRV_PCM_STREAM_CAPTURE] = rx;
-	} else {
-		flags |= SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME;
-	}
+	pcm_conf->chan_names[SNDRV_PCM_STREAM_PLAYBACK] = tx;
+	pcm_conf->chan_names[SNDRV_PCM_STREAM_CAPTURE] = rx;
 
 	return devm_snd_dmaengine_pcm_register(dev, pcm_conf, flags);
 }
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index 588aa01..e06aa31 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -1305,8 +1305,6 @@  static int samsung_i2s_probe(struct platform_device *pdev)
 	}
 	pri_dai->dma_playback.addr = regs_base + I2STXD;
 	pri_dai->dma_capture.addr = regs_base + I2SRXD;
-	pri_dai->dma_playback.chan_name = "tx";
-	pri_dai->dma_capture.chan_name = "rx";
 	pri_dai->dma_playback.addr_width = 4;
 	pri_dai->dma_capture.addr_width = 4;
 	pri_dai->quirks = quirks;
@@ -1326,7 +1324,6 @@  static int samsung_i2s_probe(struct platform_device *pdev)
 		sec_dai->lock = &pri_dai->spinlock;
 		sec_dai->variant_regs = pri_dai->variant_regs;
 		sec_dai->dma_playback.addr = regs_base + I2STXDS;
-		sec_dai->dma_playback.chan_name = "tx-sec";
 
 		if (!np) {
 			sec_dai->dma_playback.filter_data = i2s_pdata->dma_play_sec;
diff --git a/sound/soc/samsung/s3c2412-i2s.c b/sound/soc/samsung/s3c2412-i2s.c
index 3e89fbc..40331a0 100644
--- a/sound/soc/samsung/s3c2412-i2s.c
+++ b/sound/soc/samsung/s3c2412-i2s.c
@@ -35,12 +35,10 @@ 
 #include <linux/platform_data/asoc-s3c.h>
 
 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_out = {
-	.chan_name	= "tx",
 	.addr_width	= 4,
 };
 
 static struct snd_dmaengine_dai_dma_data s3c2412_i2s_pcm_stereo_in = {
-	.chan_name	= "rx",
 	.addr_width	= 4,
 };
 
diff --git a/sound/soc/samsung/s3c24xx-i2s.c b/sound/soc/samsung/s3c24xx-i2s.c
index c78a936..d59a47d 100644
--- a/sound/soc/samsung/s3c24xx-i2s.c
+++ b/sound/soc/samsung/s3c24xx-i2s.c
@@ -33,12 +33,10 @@ 
 #include <linux/platform_data/asoc-s3c.h>
 
 static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_out = {
-	.chan_name	= "tx",
 	.addr_width	= 2,
 };
 
 static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_in = {
-	.chan_name	= "rx",
 	.addr_width	= 2,
 };
 
diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index 6cef397..f2d372d 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -263,7 +263,6 @@  static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
 	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
 	const struct snd_dmaengine_pcm_config *config = pcm->config;
 	struct device *dev = rtd->platform->dev;
-	struct snd_dmaengine_dai_dma_data *dma_data;
 	struct snd_pcm_substream *substream;
 	size_t prealloc_buffer_size;
 	size_t max_buffer_size;
@@ -284,12 +283,9 @@  static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
 		if (!substream)
 			continue;
 
-		dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
-
-		if (!pcm->chan[i] &&
-		    (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
+		if (!pcm->chan[i] && config->chan_names[i])
 			pcm->chan[i] = dma_request_slave_channel(dev,
-				dma_data->chan_name);
+				config->chan_names[i]);
 
 		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
 			pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
@@ -359,9 +355,7 @@  static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
 	const char *name;
 	struct dma_chan *chan;
 
-	if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
-			   SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
-	    !dev->of_node)
+	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node)
 		return 0;
 
 	if (config && config->dma_dev) {