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From: Richard Fitzgerald <rf@opensource.cirrus.com>
To: <broonie@kernel.org>
Cc: <alsa-devel@alsa-project.org>, <patches@opensource.cirrus.com>,
	<linux-kernel@vger.kernel.org>,
	Richard Fitzgerald <rf@opensource.cirrus.com>
Subject: [PATCH 3/3] ASoC: cs42l42: Fix bclk calculation for mono
Date: Thu, 29 Jul 2021 18:09:29 +0100	[thread overview]
Message-ID: <20210729170929.6589-3-rf@opensource.cirrus.com> (raw)
In-Reply-To: <20210729170929.6589-1-rf@opensource.cirrus.com>

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")
---
 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 38e243a815b1..08ca05bfbeb3 100644
--- 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) {
-- 
2.11.0


  parent reply	other threads:[~2021-07-29 17:09 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 17:09 [PATCH 1/3] ASoC: cs42l42: Correct definition of ADC Volume control Richard Fitzgerald
2021-07-29 17:09 ` [PATCH 2/3] ASoC: cs42l42: Don't allow SND_SOC_DAIFMT_LEFT_J Richard Fitzgerald
2021-07-29 17:09 ` Richard Fitzgerald [this message]
2021-07-29 19:49 ` [PATCH 1/3] ASoC: cs42l42: Correct definition of ADC Volume control Mark Brown
2021-07-29 19:53   ` Mark Brown

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