From: Ondrej Zary Date: Sun, 1 Nov 2015 19:53:14 +0000 (+0100) Subject: ALSA: maestro3: Fix Allegro mute until master volume/mute is touched X-Git-Tag: firefly_0821_release~176^2~581^2~31^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2c8d08925272b9be383cd81f1973c6faf9fbf53a;p=firefly-linux-kernel-4.4.55.git ALSA: maestro3: Fix Allegro mute until master volume/mute is touched 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 Signed-off-by: Takashi Iwai --- diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c index 965d5c6f2fa0..17ae92613de4 100644 --- a/sound/pci/maestro3.c +++ b/sound/pci/maestro3.c @@ -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); + } }