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ALSA: Fix AC97 power down 

Some laptops don't like PR3 powerdown.  Do PR3 powerdown only
for the real power-saving.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Takashi Iwai 2008-06-27 11:55:20 +02:00 committed by Jaroslav Kysela
parent 942fd1ebf6
commit 6cabf6b069
1 changed files with 3 additions and 1 deletions
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4
sound/pci/ac97/ac97_codec.c
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@ -2295,9 +2295,11 @@ static void snd_ac97_powerdown(struct snd_ac97 *ac97)
power |= AC97_PD_PR0 | AC97_PD_PR1; /* ADC & DAC powerdown */
snd_ac97_write(ac97, AC97_POWERDOWN, power);
udelay(100);
power |= AC97_PD_PR2 | AC97_PD_PR3; /* Analog Mixer powerdown */
power |= AC97_PD_PR2; /* Analog Mixer powerdown (Vref on) */
snd_ac97_write(ac97, AC97_POWERDOWN, power);
if (ac97_is_power_save_mode(ac97)) {
power |= AC97_PD_PR3; /* Analog Mixer powerdown */
snd_ac97_write(ac97, AC97_POWERDOWN, power);
udelay(100);
/* AC-link powerdown, internal Clk disable */
/* FIXME: this may cause click noises on some boards */