github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-13 05:41:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ASoC: apple: mca: Add delay after configuring clock

Browse Source 
Right after the early FE setup, ADMAC gets told to start the DMA. This
can end up in a weird "slip" state with the channels transposed. Waiting
a bit fixes this; presumably this allows the clock to stabilize.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
Link: https://patch.msgid.link/20260711-apple-audio-redux-v4-7-2994d87c2f24@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Hector Martin 2026-07-11 11:11:25 +10:00 committed by Mark Brown
parent 889c26cfb9
commit 8dd595bca5
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sound/soc/apple/mca.c
View File

@ -225,6 +225,12 @@ static void mca_fe_early_trigger(struct snd_pcm_substream *substream, int cmd,
FIELD_PREP(SERDES_CONF_SYNC_SEL, 0));
mca_modify(cl, serdes_conf, SERDES_CONF_SYNC_SEL,
FIELD_PREP(SERDES_CONF_SYNC_SEL, cl->no + 1));
/*
* ADMAC gets started right after this. This delay seems
* to be needed for that to be reliable, e.g. ensure the
* clock is stable?
*/
udelay(100);
break;
default:
break;