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[ALSA] ac97 - Add a workaround for broken quirk for VT1617A codec 

On boards with VT1617A codec, the sound disappears suddenly.
This looks like a problem with HPE-bit control that is supposed to be
set in patch_vt1617a().  However, on such problematic hardwares, the
bit is actually reset mysteriously.

The patch adds a workaround for the wrong quirk.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-05-03 18:46:56 +02:00
parent 564c5bead4
commit 2e75d050e4
1 changed files with 8 additions and 1 deletions
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9
sound/pci/ac97/ac97_patch.c
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@ -3446,6 +3446,7 @@ static const struct snd_kcontrol_new snd_ac97_controls_vt1617a[] = {
int patch_vt1617a(struct snd_ac97 * ac97)
{
int err = 0;
int val;
/* we choose to not fail out at this point, but we tell the
caller when we return */
@ -3456,7 +3457,13 @@ int patch_vt1617a(struct snd_ac97 * ac97)
/* bring analog power consumption to normal by turning off the
* headphone amplifier, like WinXP driver for EPIA SP
*/
snd_ac97_write_cache(ac97, 0x5c, 0x20);
/* We need to check the bit before writing it.
* On some (many?) hardwares, setting bit actually clears it!
*/
val = snd_ac97_read(ac97, 0x5c);
if (!(val & 0x20))
snd_ac97_write_cache(ac97, 0x5c, 0x20);
ac97->ext_id |= AC97_EI_SPDIF; /* force the detection of spdif */
ac97->rates[AC97_RATES_SPDIF] = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000;
ac97->build_ops = &patch_vt1616_ops;