linux-kernel - [PATCH] ASoC: amd :High hw_level while simultaneous capture

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Date:   Wed,  6 May 2020 15:56:00 +0530
From:   Akshu Agrawal <akshu.agrawal@....com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     akshu.agrawal@....com,
        Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        alsa-devel@...a-project.org (moderated list:SOUND - SOC LAYER / DYNAMIC
        AUDIO POWER MANAGEM...), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ASoC: amd :High hw_level while simultaneous capture

Simultaneous capture on dmic and headset mic is having
issue with high hw_level being reported.

Issue Can be reproduced by:
arecord -D hw:2,0 -f dat -d 60 /tmp/test0 &
arecord -D hw:2,2 -f dat -d 60 /tmp/test1 &
cat /proc/asound/card2/pcm?c/sub0/status

Actual issue is :
When we open one capture stream on one instance lets say I2S_SP and then
once again if we open other capture on other instance lets say I2S_BT while
first capture is in progress and when we try to read the status of both
running instances by below command cat /proc/asound/card2/pcm?c/sub0/status
we observe that avail_max is being doubled on first opened
capture(I2S_SP in the example).

This is because our previous implementation was like when any instance is
opened it gets initialized in dma_open irrespective of on what instance it
called open.

For example:
First I2S_SP called opened it initializes both SP/BT capture streams
irrespective of on which instance the stream opened.next time I2S_BT
called opened and it initializes both SP/BT this corrupts the behaviour .

So with this patch the stream gets initialized only on specific instance
when ever it gets opened calls hw_params.

This rectifies the issue.

Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati@....com>
Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
---
 sound/soc/amd/raven/acp3x-pcm-dma.c | 37 +++++++++++++++++++----------
 1 file changed, 24 insertions(+), 13 deletions(-)

diff --git a/sound/soc/amd/raven/acp3x-pcm-dma.c b/sound/soc/amd/raven/acp3x-pcm-dma.c
index e362f0bc9e46..a36c5cb848cd 100644
--- a/sound/soc/amd/raven/acp3x-pcm-dma.c
+++ b/sound/soc/amd/raven/acp3x-pcm-dma.c
@@ -241,14 +241,6 @@ static int acp3x_dma_open(struct snd_soc_component *component,
 		adata->i2ssp_play_stream && !adata->i2ssp_capture_stream)
 		rv_writel(1, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		adata->play_stream = substream;
-		adata->i2ssp_play_stream = substream;
-	} else {
-		adata->capture_stream = substream;
-		adata->i2ssp_capture_stream = substream;
-	}
-
 	i2s_data->acp3x_base = adata->acp3x_base;
 	runtime->private_data = i2s_data;
 	return ret;
@@ -263,23 +255,42 @@ static int acp3x_dma_hw_params(struct snd_soc_component *component,
 	struct snd_soc_pcm_runtime *prtd;
 	struct snd_soc_card *card;
 	struct acp3x_platform_info *pinfo;
+	struct i2s_dev_data *adata;
 	u64 size;
 
 	prtd = substream->private_data;
 	card = prtd->card;
 	pinfo = snd_soc_card_get_drvdata(card);
+	adata = dev_get_drvdata(component->dev);
 	rtd = substream->runtime->private_data;
 	if (!rtd)
 		return -EINVAL;
 
-	if (pinfo)
-		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+	if (pinfo) {
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			rtd->i2s_instance = pinfo->play_i2s_instance;
-		else
+			switch (rtd->i2s_instance) {
+			case I2S_BT_INSTANCE:
+				adata->play_stream = substream;
+				break;
+			case I2S_SP_INSTANCE:
+			default:
+				adata->i2ssp_play_stream = substream;
+			}
+		} else {
 			rtd->i2s_instance = pinfo->cap_i2s_instance;
-	else
+			switch (rtd->i2s_instance) {
+			case I2S_BT_INSTANCE:
+				adata->capture_stream = substream;
+				break;
+			case I2S_SP_INSTANCE:
+			default:
+				adata->i2ssp_capture_stream = substream;
+			}
+		}
+	} else {
 		pr_err("pinfo failed\n");
-
+	}
 	size = params_buffer_bytes(params);
 	rtd->dma_addr = substream->dma_buffer.addr;
 	rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
-- 
2.17.1