ASoC: cs42l42: Fix bclk calculation for mono

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>

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 38e243a..08ca05b 100644 (file)
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -830,6 +830,10 @@ 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) {