linux-kernel - Applied "ASoC: AMD: Reset bytescount when starting transaction" to the asoc tree

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Date:   Tue, 03 Jul 2018 16:34:13 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Daniel Kurtz <djkurtz@...omium.org>
Cc:     Mark Brown <broonie@...nel.org>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Guenter Roeck <linux@...ck-us.net>,
        Akshu Agrawal <akshu.agrawal@....com>,
        alsa-devel@...a-project.org
Subject: Applied "ASoC: AMD: Reset bytescount when starting transaction" to the asoc tree

The patch

   ASoC: AMD: Reset bytescount when starting transaction

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 1a337a1e7885085d224583c766614e5945bde671 Mon Sep 17 00:00:00 2001
From: Daniel Kurtz <djkurtz@...omium.org>
Date: Mon, 2 Jul 2018 15:19:51 -0600
Subject: [PATCH] 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@...omium.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 sound/soc/amd/acp-pcm-dma.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

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;
-- 
2.18.0.rc2