linux-kernel - [PATCH] snd-maestro3: Fix Allegro mute until master volume/mute is touched

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Date:	Sun,  1 Nov 2015 20:53:14 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	alsa-devel@...a-project.org
Cc:	Takashi Iwai <tiwai@...e.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: [PATCH] snd-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@...nbow-software.org>
---
 sound/pci/maestro3.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
index 965d5c6..17ae926 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);
+	}
 }
 
 
-- 
Ondrej Zary

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