linux-kernel - [PATCH 04/12] ASoC: cs42l42: Don't reconfigure the PLL while it is running

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Message-ID: <20210810153759.24333-5-rf@opensource.cirrus.com>
Date:   Tue, 10 Aug 2021 16:37:51 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH 04/12] ASoC: cs42l42: Don't reconfigure the PLL while it is running

cs42l42_pcm_hw_params() must only configure the PLL if this is the first
stream to become active, otherwise it will be overwriting the registers
while the PLL is running.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 43fc357199f9 ("ASoC: cs42l42: Set clock source for both ways of stream")
---
 sound/soc/codecs/cs42l42.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 5dc3a30272a4..1893d3694570 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -884,7 +884,11 @@ static int cs42l42_pcm_hw_params(struct snd_pcm_substream *substream,
 		break;
 	}
 
-	return cs42l42_pll_config(component);
+	/* Configure the PLL if this is the first active stream */
+	if (!cs42l42->stream_use)
+		return cs42l42_pll_config(component);
+	else
+		return 0;
 }
 
 static int cs42l42_set_sysclk(struct snd_soc_dai *dai,
-- 
2.11.0