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Commit 78e45c99 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Mark Brown
Browse files

ASoC: pcm: Always honor DAI min and max sample rate constraints 



snd_pcm_limit_hw_rates() will initialize the minimum and maximum sample rate for
the PCM stream based on the rates specified in the rates field. Since we call
snd_pcm_limit_hw_rates() after soc_pcm_init_runtime_hw() it will essentially
overwrite the min and max rate set in soc_pcm_init_runtime_hw(). This may cause
the minimum or maximum rate to be set to a value outside the range of one of the
components if one of the components sets either SNDRV_PCM_RATE_CONTINUOUS or
SNDRV_PCM_RATE_KNOT and the other component specified a discrete rate via
SNDRV_PCM_RATE_[0-9]* that is outside of the first component's rate range. To
fix this first calculate the minimum and maximum rates using
snd_pcm_limit_hw_rates() and then on top of that apply the contraints specified
in the snd_soc_pcm_stream structs.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Acked-by: default avatarTakashi iwai <tiwai@suse.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 17b6c19b

sound/soc/soc-pcm.c

+12 −6
Original line number Diff line number Diff line
@@ -148,12 +148,12 @@ static void soc_pcm_apply_msb(struct snd_pcm_substream *substream, 
	}

}



static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw,

static void soc_pcm_init_runtime_hw(struct snd_pcm_runtime *runtime,

	struct snd_soc_pcm_stream *codec_stream,

	struct snd_soc_pcm_stream *cpu_stream)

{

	hw->rate_min = max(codec_stream->rate_min, cpu_stream->rate_min);

	hw->rate_max = min_not_zero(codec_stream->rate_max, cpu_stream->rate_max);

	struct snd_pcm_hardware *hw = &runtime->hw;



	hw->channels_min = max(codec_stream->channels_min,

		cpu_stream->channels_min);

	hw->channels_max = min(codec_stream->channels_max,
@@ -166,6 +166,13 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_hardware *hw, 
	if (cpu_stream->rates

		& (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))

		hw->rates |= codec_stream->rates;



	snd_pcm_limit_hw_rates(runtime);



	hw->rate_min = max(hw->rate_min, cpu_stream->rate_min);

	hw->rate_min = max(hw->rate_min, codec_stream->rate_min);

	hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);

	hw->rate_max = min_not_zero(hw->rate_max, codec_stream->rate_max);

}



/*
@@ -235,15 +242,14 @@ static int soc_pcm_open(struct snd_pcm_substream *substream) 


	/* Check that the codec and cpu DAIs are compatible */

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {

		soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->playback,

		soc_pcm_init_runtime_hw(runtime, &codec_dai_drv->playback,

			&cpu_dai_drv->playback);

	} else {

		soc_pcm_init_runtime_hw(&runtime->hw, &codec_dai_drv->capture,

		soc_pcm_init_runtime_hw(runtime, &codec_dai_drv->capture,

			&cpu_dai_drv->capture);

	}



	ret = -EINVAL;

	snd_pcm_limit_hw_rates(runtime);

	if (!runtime->hw.rates) {

		printk(KERN_ERR "ASoC: %s <-> %s No matching rates\n",

			codec_dai->name, cpu_dai->name);