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Commit bfcc8c2c authored by Meng Wang's avatar Meng Wang Committed by Gerrit - the friendly Code Review server
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SoC: pcm: Add delay_blk feature 



Add delay_blk() to pcm, platform and DAI ops.
The pcm delay_blk() op collects the audio DSP path
delay from the low-level drivers and sets the
runtime->delay field to their aggregate.

Change-Id: Ib7e10f44ab8ccb46dc2f5825081d0afef662d827
Signed-off-by: default avatarKenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: default avatarMeng Wang <mwang@codeaurora.org>
parent 879425ed

include/sound/pcm.h

+3 −0
Original line number Diff line number Diff line
@@ -80,6 +80,9 @@ struct snd_pcm_ops { 
			struct timespec *system_ts, struct timespec *audio_ts,

			struct snd_pcm_audio_tstamp_config *audio_tstamp_config,

			struct snd_pcm_audio_tstamp_report *audio_tstamp_report);

	int (*delay_blk)(struct snd_pcm_substream *substream);

	int (*wall_clock)(struct snd_pcm_substream *substream,

			struct timespec *audio_ts);

	int (*fill_silence)(struct snd_pcm_substream *substream, int channel,

			    unsigned long pos, unsigned long bytes);

	int (*copy_user)(struct snd_pcm_substream *substream, int channel,

include/sound/soc.h

+10 −0
Original line number Diff line number Diff line
@@ -986,6 +986,16 @@ struct snd_soc_platform_driver { 
	int (*pcm_new)(struct snd_soc_pcm_runtime *);

	void (*pcm_free)(struct snd_pcm *);



	/*

	 * For platform-caused delay reporting, where the thread blocks waiting

	 * for the delay amount to be determined.  Defining this will cause the

	 * ASoC core to skip calling the delay callbacks for all components in

	 * the runtime.

	 * Optional.

	 */

	snd_pcm_sframes_t (*delay_blk)(struct snd_pcm_substream *,

		struct snd_soc_dai *);



	/* platform stream pcm ops */

	const struct snd_pcm_ops *ops;

sound/soc/soc-pcm.c

+21 −0
Original line number Diff line number Diff line
@@ -1190,6 +1190,9 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream) 
	if (platform->driver->ops && platform->driver->ops->pointer)

		offset = platform->driver->ops->pointer(substream);



	if (platform->driver->delay_blk)

		return offset;



	if (cpu_dai->driver->ops && cpu_dai->driver->ops->delay)

		delay += cpu_dai->driver->ops->delay(substream, cpu_dai);
@@ -1207,6 +1210,22 @@ static snd_pcm_uframes_t soc_pcm_pointer(struct snd_pcm_substream *substream) 
	return offset;

}



static int soc_pcm_delay_blk(struct snd_pcm_substream *substream)

{

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_platform *platform = rtd->platform;

	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_sframes_t delay = 0;



	if (platform->driver->delay_blk)

		delay = platform->driver->delay_blk(substream,

				rtd->codec_dais[0]);



	runtime->delay = delay;



	return 0;

}



/* connect a FE and BE */

static int dpcm_be_connect(struct snd_soc_pcm_runtime *fe,

		struct snd_soc_pcm_runtime *be, int stream)
@@ -2838,6 +2857,7 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) 
		rtd->ops.hw_free	= dpcm_fe_dai_hw_free;

		rtd->ops.close		= dpcm_fe_dai_close;

		rtd->ops.pointer	= soc_pcm_pointer;

		rtd->ops.delay_blk	= soc_pcm_delay_blk;

		rtd->ops.ioctl		= soc_pcm_ioctl;

		rtd->ops.compat_ioctl   = soc_pcm_compat_ioctl;

	} else {
@@ -2848,6 +2868,7 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) 
		rtd->ops.hw_free	= soc_pcm_hw_free;

		rtd->ops.close		= soc_pcm_close;

		rtd->ops.pointer	= soc_pcm_pointer;

		rtd->ops.delay_blk	= soc_pcm_delay_blk;

		rtd->ops.ioctl		= soc_pcm_ioctl;

		rtd->ops.compat_ioctl   = soc_pcm_compat_ioctl;

	}