diff mbox series

[v2] ASoC: wm8962: Wait for updated value of WM8962_CLOCKING1 register

Message ID 20221109121354.123958-1-chancel.liu@nxp.com
State Accepted
Commit 3ca507bf99611c82dafced73e921c1b10ee12869
Headers show
Series [v2] ASoC: wm8962: Wait for updated value of WM8962_CLOCKING1 register | expand

Commit Message

Chancel Liu Nov. 9, 2022, 12:13 p.m. UTC 
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>
---
 sound/soc/codecs/wm8962.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c
index b4b4355c6728..b901e4c65e8a 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)