From: Daniel Kurtz Date: Mon, 2 Jul 2018 21:19:51 +0000 (-0600) Subject: ASoC: AMD: Reset bytescount when starting transaction X-Git-Tag: Ubuntu-5.2.0-15.16~3553^2^2~204 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=1a337a1e7885085d224583c766614e5945bde671;p=mirror_ubuntu-eoan-kernel.git 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 Signed-off-by: Mark Brown --- diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c index cd4d2520ac14..ab60129f4f26 100644 --- a/sound/soc/amd/acp-pcm-dma.c +++ b/sound/soc/amd/acp-pcm-dma.c @@ -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;