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ASoC: wm8962: Wait for updated value of WM8962_CLOCKING1 register

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[ Upstream commit 3ca507bf99 ]

DSPCLK_DIV field in WM8962_CLOCKING1 register is used to generate
correct frequency of LRCLK and BCLK. Sometimes the read-only value
can't be updated timely after enabling SYSCLK. This results in wrong
calculation values. Delay is introduced here to wait for newest value
from register. The time of the delay should be at least 500~1000us
according to test.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20221109121354.123958-1-chancel.liu@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chancel Liu 2022-11-09 20:13:54 +08:00 committed by Greg Kroah-Hartman
parent b4d70acb25
commit 5e8a6f40d1
1 changed files with 8 additions and 0 deletions
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8
sound/soc/codecs/wm8962.c
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@ -2503,6 +2503,14 @@ static void wm8962_configure_bclk(struct snd_soc_component *component)
snd_soc_component_update_bits(component, WM8962_CLOCKING2,
WM8962_SYSCLK_ENA_MASK, WM8962_SYSCLK_ENA);
/* DSPCLK_DIV field in WM8962_CLOCKING1 register is used to generate
* correct frequency of LRCLK and BCLK. Sometimes the read-only value
* can't be updated timely after enabling SYSCLK. This results in wrong
* calculation values. Delay is introduced here to wait for newest
* value from register. The time of the delay should be at least
* 500~1000us according to test.
*/
usleep_range(500, 1000);
dspclk = snd_soc_component_read(component, WM8962_CLOCKING1);
if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_ON)