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ASoC: amd: Reporting accurate hw_ptr for acp3x dma 

acp3x dma pointer callback has issues in reporting hw_ptr.
Modified logic to use linear position registers to
retrieve accurate hw_ptr.

Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati@amd.com>
Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ravulapati Vishnu vardhan rao 2019-05-10 07:11:07 +05:30 committed by Mark Brown
parent 261e90829f
commit 35a7086eaa
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 30 additions and 11 deletions
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41
sound/soc/amd/raven/acp3x-pcm-dma.c
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@ -32,6 +32,7 @@ struct i2s_stream_instance {
u16 channels;
u32 xfer_resolution;
struct page *pg;
u64 bytescount;
void __iomem *acp3x_base;
};
@ -317,6 +318,24 @@ static int acp3x_dma_open(struct snd_pcm_substream *substream)
return 0;
}
static u64 acp_get_byte_count(struct i2s_stream_instance *rtd, int direction)
{
u64 byte_count;
if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
byte_count = rv_readl(rtd->acp3x_base +
mmACP_BT_TX_LINEARPOSITIONCNTR_HIGH);
byte_count |= rv_readl(rtd->acp3x_base +
mmACP_BT_TX_LINEARPOSITIONCNTR_LOW);
} else {
byte_count = rv_readl(rtd->acp3x_base +
mmACP_BT_RX_LINEARPOSITIONCNTR_HIGH);
byte_count |= rv_readl(rtd->acp3x_base +
mmACP_BT_RX_LINEARPOSITIONCNTR_LOW);
}
return byte_count;
}
static int acp3x_dma_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
@ -350,18 +369,17 @@ static int acp3x_dma_hw_params(struct snd_pcm_substream *substream,
static snd_pcm_uframes_t acp3x_dma_pointer(struct snd_pcm_substream *substream)
{
u32 pos = 0;
struct i2s_stream_instance *rtd = substream->runtime->private_data;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
pos = rv_readl(rtd->acp3x_base +
mmACP_BT_TX_LINKPOSITIONCNTR);
else
pos = rv_readl(rtd->acp3x_base +
mmACP_BT_RX_LINKPOSITIONCNTR);
if (pos >= MAX_BUFFER)
pos = 0;
u32 buffersize = 0;
u64 bytescount = 0;
struct i2s_stream_instance *rtd =
substream->runtime->private_data;
buffersize = frames_to_bytes(substream->runtime,
substream->runtime->buffer_size);
bytescount = acp_get_byte_count(rtd, substream->stream);
if (bytescount > rtd->bytescount)
bytescount -= rtd->bytescount;
pos = do_div(bytescount, buffersize);
return bytes_to_frames(substream->runtime, pos);
}
@ -521,6 +539,7 @@ static int acp3x_dai_i2s_trigger(struct snd_pcm_substream *substream,
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
rtd->bytescount = acp_get_byte_count(rtd, substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
rv_writel(period_bytes, rtd->acp3x_base +
mmACP_BT_TX_INTR_WATERMARK_SIZE);