[PATCH 5.13 045/151] ASoC: cs42l42: Fix bclk calculation for mono

Greg Kroah-Hartman
2021-08-16T13:22:14Z

From: Richard Fitzgerald <rf@opensource.cirrus.com>

[ Upstream commit 926ef1a4c245c093acc07807e466ad2ef0ff6ccb ]

An I2S frame always has a left and right channel slot even if mono
data is being sent. So if channels==1 the actual bitclock frequency
is 2 * snd_soc_params_to_bclk(params).

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 2cdba9b045c7 ("ASoC: cs42l42: Use bclk from hw_params if set_sysclk was not called")
Link: https://lore.kernel.org/r/20210729170929.6589-3-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/codecs/cs42l42.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 0d31c84b0445..fe73a5c70bdd 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -820,6 +820,10 @@ static int cs42l42_pcm_hw_params(struct snd_pcm_substream *substream,
cs42l42->srate = params_rate(params);
cs42l42->bclk = snd_soc_params_to_bclk(params);

+ /* I2S frame always has 2 channels even for mono audio */
+ if (channels == 1)
+ cs42l42->bclk *= 2;
+
switch(substream->stream) {
case SNDRV_PCM_STREAM_CAPTURE:
if (channels == 2) {
--
2.30.2