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| author | Takashi Iwai <tiwai@suse.de> | 2008-05-03 18:46:56 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2008-05-05 14:12:08 +0200 |
| commit | 2e75d050e42d1c61e820f9a35078a2f69e02cc3e (patch) | |
| tree | ac8a76568f9a67097951d9eb466863cb4e42cfd7 /sound/pci | |
| parent | 564c5bead424fa798dfbd5fe382b4e0b7ea483fb (diff) | |
| download | linux-2e75d050e42d1c61e820f9a35078a2f69e02cc3e.tar.gz linux-2e75d050e42d1c61e820f9a35078a2f69e02cc3e.tar.bz2 linux-2e75d050e42d1c61e820f9a35078a2f69e02cc3e.zip | |
[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>
Diffstat (limited to 'sound/pci')
| -rw-r--r-- | sound/pci/ac97/ac97_patch.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c index 39198e505b12..2da89810ca10 100644 --- a/sound/pci/ac97/ac97_patch.c +++ b/sound/pci/ac97/ac97_patch.c @@ -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; |