[PATCH] ASoC: codec: rt5640: Resolve failure to set DMIC clock after playback

[Jarrah Gosbell]

From: Ondrej Jirman <megi@xxxxxx>

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@xxxxxx>
Signed-off-by: Jarrah Gosbell <kernel@undef.tools>
---
 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 18e01949f20e..054de41ceccb 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 reg_val = 0;
 	unsigned int pll_bit = 0;
 
+	if (freq == 0)
+		return 0;
+
 	switch (clk_id) {
 	case RT5640_SCLK_S_MCLK:
 		reg_val |= RT5640_SCLK_SRC_MCLK;
-- 
2.39.0