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 --- include/sound/dmaengine_pcm.h | 5 +++++ sound/soc/soc-generic-dmaengine-pcm.c | 23 ++++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h index 1a7897a..e705286 100644 --- a/include/sound/dmaengine_pcm.h +++ b/include/sound/dmaengine_pcm.h @@ -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 diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c index d6e6380..ae0c37e 100644 --- a/sound/soc/soc-generic-dmaengine-pcm.c +++ b/sound/soc/soc-generic-dmaengine-pcm.c @@ -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);