renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-15 08:44:14 +08:00
Code

ALSA: maestro3: Fix Allegro mute until master volume/mute is touched

Browse Source 
ESS Allegro (marked ES1989S), [125d:1988] (rev 10) is mute after
loading snd-maestro3 and running alsactl restore. Touching master
volume or mute makes it work.

Looks like a bug in the AC'97 codec integrated into the chip.

Write AC97_MASTER register twice to work-around the problem.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ondrej Zary 2015-11-01 20:53:14 +01:00 committed by Takashi Iwai
parent 030270ba1a
commit 2c8d089252
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sound/pci/maestro3.c
View File

@ -1929,6 +1929,16 @@ snd_m3_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
return;
snd_m3_outw(chip, val, CODEC_DATA);
snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
/*
* Workaround for buggy ES1988 integrated AC'97 codec. It remains silent
* until the MASTER volume or mute is touched (alsactl restore does not
* work).
*/
if (ac97->id == 0x45838308 && reg == AC97_MASTER) {
snd_m3_ac97_wait(chip);
snd_m3_outw(chip, val, CODEC_DATA);
snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
}
}