From: Chancel Liu Date: Wed, 9 Nov 2022 12:13:54 +0000 (+0800) Subject: ASoC: wm8962: Wait for updated value of WM8962_CLOCKING1 register X-Git-Tag: v6.6.17~5842^2~6^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3ca507bf99611c82dafced73e921c1b10ee12869;p=platform%2Fkernel%2Flinux-rpi.git ASoC: wm8962: Wait for updated value of WM8962_CLOCKING1 register 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 Acked-by: Charles Keepax Link: https://lore.kernel.org/r/20221109121354.123958-1-chancel.liu@nxp.com Signed-off-by: Mark Brown --- diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c index b4b4355..b901e4c 100644 --- a/sound/soc/codecs/wm8962.c +++ b/sound/soc/codecs/wm8962.c @@ -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)