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ASoC: dmaengine-pcm: Add support for platforms which can't report residue

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Unfortunately there are still quite a few platforms with a dmaengine driver
which do not support reporting the number of bytes left to transfer. If we want
to support these platforms in the generic dmaengine PCM driver we have.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen 2013-04-15 19:19:55 +02:00 committed by Mark Brown
parent 11a8576a0a
commit 610f780050
2 changed files with 27 additions and 1 deletions
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5
include/sound/dmaengine_pcm.h
View File

@ -86,6 +86,11 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
* makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well.
*/
#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
/*
* The platforms dmaengine driver does not support reporting the ammount of
* bytes that are still left to transfer.
*/
#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2)
/**
* struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM

23
sound/soc/soc-generic-dmaengine-pcm.c
View File

@ -193,6 +193,23 @@ static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
.probe_order = SND_SOC_COMP_ORDER_LATE,
};
static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
.open = dmaengine_pcm_open,
.close = snd_dmaengine_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = dmaengine_pcm_hw_params,
.hw_free = snd_pcm_lib_free_pages,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer_no_residue,
};
static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
.ops = &dmaengine_no_residue_pcm_ops,
.pcm_new = dmaengine_pcm_new,
.pcm_free = dmaengine_pcm_free,
.probe_order = SND_SOC_COMP_ORDER_LATE,
};
static const char * const dmaengine_pcm_dma_channel_names[] = {
[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
[SNDRV_PCM_STREAM_CAPTURE] = "rx",
@ -226,7 +243,11 @@ int snd_dmaengine_pcm_register(struct device *dev,
}
}
return snd_soc_add_platform(dev, &pcm->platform,
if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
return snd_soc_add_platform(dev, &pcm->platform,
&dmaengine_no_residue_pcm_platform);
else
return snd_soc_add_platform(dev, &pcm->platform,
&dmaengine_pcm_platform);
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);