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ASoC: AMD: Reset bytescount when starting transaction 

The pointer() callback gets its value by reading the I2S BYTE_COUNT
register.  This is a 64-bit runnning transaction counter. If a
transaction was aborted in the middle of a sample buffer, the counter will
stop counting on a number divisible by the buffer size.  Since we actually
use it as a pointer into an aligned buffer, however, we do want to ensure
that it always starts at a number divisible by the buffer size when
starting a transaction, hence we reset it whenever starting a transaction.

To accomplish this, it wasn't necessary to zero bytescount at the
termination of each transaction, so remove this unnecessary code.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Daniel Kurtz 2018-07-02 15:19:51 -06:00 committed by Mark Brown
parent 8c6b964edd
commit 1a337a1e78
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 5 deletions
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6
sound/soc/amd/acp-pcm-dma.c
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@ -1013,7 +1013,6 @@ static int acp_dma_prepare(struct snd_pcm_substream *substream)
static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
{
int ret;
u64 bytescount = 0;
struct snd_pcm_runtime *runtime = substream->runtime;
struct audio_substream_data *rtd = runtime->private_data;
@ -1024,9 +1023,7 @@ static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_RESUME:
bytescount = acp_get_byte_count(rtd);
if (rtd->bytescount == 0)
rtd->bytescount = bytescount;
rtd->bytescount = acp_get_byte_count(rtd);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
acp_dma_start(rtd->acp_mmio, rtd->ch1);
acp_dma_start(rtd->acp_mmio, rtd->ch2);
@ -1053,7 +1050,6 @@ static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_SUSPEND:
acp_dma_stop(rtd->acp_mmio, rtd->ch2);
ret = acp_dma_stop(rtd->acp_mmio, rtd->ch1);
rtd->bytescount = 0;
break;
default:
ret = -EINVAL;