From 7c298f52d6a371351d7e85af6da0412aeb2ff224 Mon Sep 17 00:00:00 2001
From: Ondrej Jirman <megi@xff.cz>
Date: Sat, 27 Aug 2022 20:48:32 +0200
Subject: [PATCH 332/463] ASoC: codecs: rt5640: Resolve failure to set DMIC
 clock after playback

rt5640_set_dai_sysclk is called with freq == 0 when playback stops. This
causes DMIC setup code to fail. I2S interface doesn't need to be active
for codec to work, so don't clear rt5640->sysclk after rt5640_set_dai_sysclk
is called with freq == 0.

Signed-off-by: Ondrej Jirman <megi@xff.cz>
---
 sound/soc/codecs/rt5640.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index 27db764ca273a..de3a0b7112a3e 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -1839,6 +1839,9 @@ static int rt5640_set_dai_sysclk(struct snd_soc_dai *dai,
 	unsigned int pll_bit = 0;
 	int ret;
 
+	if (freq == 0)
+		return 0;
+
 	switch (clk_id) {
 	case RT5640_SCLK_S_MCLK:
 		ret = clk_set_rate(rt5640->mclk, freq);
-- 
2.46.0

