path: root/sound/pci/maestro3.c
diff options
authorOndrej Zary <linux@rainbow-software.org>2015-11-01 20:53:14 +0100
committerTakashi Iwai <tiwai@suse.de>2015-11-02 08:46:30 +0100
commit2c8d08925272b9be383cd81f1973c6faf9fbf53a (patch)
tree6e012daa67c9e027e3505ec366a41f2800d63af1 /sound/pci/maestro3.c
parentALSA: maestro3: Enable docking support for Dell Latitude C810 (diff)
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 <linux@rainbow-software.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/pci/maestro3.c')
1 files changed, 10 insertions, 0 deletions
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)
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);
+ }