ASoC: dmaengine-pcm: Add support for platforms which can't report residue
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>
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 @@
.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 @@
}
}
- 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);