linux-kernel - [PATCH] ASoC: simple-card-utils: Don't reset clock of active DAI

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Date:   Thu, 10 Mar 2022 16:46:39 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <broonie@...nel.org>, <lgirdwood@...il.com>, <perex@...ex.cz>,
        <tiwai@...e.com>
CC:     <kuninori.morimoto.gx@...esas.com>, <robert.hancock@...ian.com>,
        <stephan@...hold.net>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, Sameer Pujar <spujar@...dia.com>
Subject: [PATCH] ASoC: simple-card-utils: Don't reset clock of active DAI

Playback or capture errors are seen when clock is reset during an active
stage of DAI. Presently this scenario happens when DAI has both playback
and capture sessions running and one of these finishes first which will
be followed by clock rate reset. The remaining active session will be
affected in such case.

Address this problem by allowing clock rate reset to happen only when
the DAI is no more active.

Signed-off-by: Sameer Pujar <spujar@...dia.com>
---
 sound/soc/generic/simple-card-utils.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index a4babfb..6a5faaf 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -272,15 +272,19 @@ void asoc_simple_shutdown(struct snd_pcm_substream *substream)
 	int i;
 
 	for_each_prop_dai_cpu(props, i, dai) {
-		if (props->mclk_fs && !dai->clk_fixed)
-			snd_soc_dai_set_sysclk(asoc_rtd_to_cpu(rtd, i),
+		struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, i);
+
+		if (props->mclk_fs && !dai->clk_fixed && !snd_soc_dai_active(cpu_dai))
+			snd_soc_dai_set_sysclk(cpu_dai,
 					       0, 0, SND_SOC_CLOCK_IN);
 
 		asoc_simple_clk_disable(dai);
 	}
 	for_each_prop_dai_codec(props, i, dai) {
-		if (props->mclk_fs && !dai->clk_fixed)
-			snd_soc_dai_set_sysclk(asoc_rtd_to_codec(rtd, i),
+		struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, i);
+
+		if (props->mclk_fs && !dai->clk_fixed && !snd_soc_dai_active(codec_dai))
+			snd_soc_dai_set_sysclk(codec_dai,
 					       0, 0, SND_SOC_CLOCK_IN);
 
 		asoc_simple_clk_disable(dai);
-- 
2.7.4