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path: root/sound/soc/soc-generic-dmaengine-pcm.c
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Diffstat (limited to 'sound/soc/soc-generic-dmaengine-pcm.c')
-rw-r--r--sound/soc/soc-generic-dmaengine-pcm.c66
1 files changed, 42 insertions, 24 deletions
diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index 2a6c569d991f..560a7787d8a7 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -144,6 +144,8 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
if (ret == 0) {
if (dma_caps.cmd_pause)
hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
+ if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
+ hw.info |= SNDRV_PCM_INFO_BATCH;
}
return snd_soc_set_runtime_hwparams(substream, &hw);
@@ -187,6 +189,21 @@ static struct dma_chan *dmaengine_pcm_compat_request_channel(
dma_data->filter_data);
}
+static bool dmaengine_pcm_can_report_residue(struct dma_chan *chan)
+{
+ struct dma_slave_caps dma_caps;
+ int ret;
+
+ ret = dma_get_slave_caps(chan, &dma_caps);
+ if (ret != 0)
+ return true;
+
+ if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
+ return false;
+
+ return true;
+}
+
static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
@@ -239,6 +256,16 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
max_buffer_size);
if (ret)
goto err_free;
+
+ /*
+ * This will only return false if we know for sure that at least
+ * one channel does not support residue reporting. If the DMA
+ * driver does not implement the slave_caps API we rely having
+ * the NO_RESIDUE flag set manually in case residue reporting is
+ * not supported.
+ */
+ if (!dmaengine_pcm_can_report_residue(pcm->chan[i]))
+ pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;
}
return 0;
@@ -248,6 +275,18 @@ err_free:
return ret;
}
+static snd_pcm_uframes_t dmaengine_pcm_pointer(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
+
+ if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
+ return snd_dmaengine_pcm_pointer_no_residue(substream);
+ else
+ return snd_dmaengine_pcm_pointer(substream);
+}
+
static const struct snd_pcm_ops dmaengine_pcm_ops = {
.open = dmaengine_pcm_open,
.close = snd_dmaengine_pcm_close,
@@ -255,7 +294,7 @@ static const struct snd_pcm_ops dmaengine_pcm_ops = {
.hw_params = dmaengine_pcm_hw_params,
.hw_free = snd_pcm_lib_free_pages,
.trigger = snd_dmaengine_pcm_trigger,
- .pointer = snd_dmaengine_pcm_pointer,
+ .pointer = dmaengine_pcm_pointer,
};
static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
@@ -265,23 +304,6 @@ 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",
@@ -374,12 +396,8 @@ int snd_dmaengine_pcm_register(struct device *dev,
if (ret)
goto err_free_dma;
- if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
- ret = snd_soc_add_platform(dev, &pcm->platform,
- &dmaengine_no_residue_pcm_platform);
- else
- ret = snd_soc_add_platform(dev, &pcm->platform,
- &dmaengine_pcm_platform);
+ ret = snd_soc_add_platform(dev, &pcm->platform,
+ &dmaengine_pcm_platform);
if (ret)
goto err_free_dma;