linux-kernel - [RESEND PATCH] ASoC: wm8960: Fix clock configuration on slave mode

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Date:   Tue, 12 Oct 2021 18:54:30 +0800
From:   Shengjiu Wang <shengjiu.wang@....com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, ckeepax@...nsource.cirrus.com,
        kuninori.morimoto.gx@...esas.com, patches@...nsource.cirrus.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [RESEND PATCH] ASoC: wm8960: Fix clock configuration on slave mode

There is a noise issue for 8kHz sample rate on slave mode.
Compared with master mode, the difference is the DACDIV
setting, after correcting the DACDIV, the noise is gone.

There is no noise issue for 48kHz sample rate, because
the default value of DACDIV is correct for 48kHz.

So wm8960_configure_clocking() should be functional for
ADC and DAC function even if it is slave mode.

In order to be compatible for old use case, just add
condition for checking that sysclk is zero with
slave mode.

Fixes: 0e50b51aa22f ("ASoC: wm8960: Let wm8960 driver configure its bit clock and frame clock")
Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 sound/soc/codecs/wm8960.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 9e621a254392..9c6af76a60fd 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -742,7 +742,7 @@ static int wm8960_configure_clocking(struct snd_soc_component *component)
 	int i, j, k;
 	int ret;
 
-	if (!(iface1 & (1<<6))) {
+	if (!(iface1 & (1 << 6)) && !wm8960->sysclk) {
 		dev_dbg(component->dev,
 			"Codec is slave mode, no need to configure clock\n");
 		return 0;
-- 
2.17.1