ALSA: hda/realtek - Avoid invalid COEFs for ALC271X

commit d3c56568f43807135f2c2a09582a69f809f0d8b7 upstream.

We've seen often problems after suspend/resume on Acer Aspire One
AO725 with ALC271X codec as reported in kernel bugzilla, and it turned
out that some COEFs doesn't work and triggers the codec communication
stall.

Since these magic COEF setups are specific to ALC269VB for some PLL
configurations, the machine works even without these manual
adjustment.  So, let's simply avoid applying them for ALC271X.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=52181
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[bwh: Backported to 3.2: return 0]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 1f78ca6..36bce68 100644 (file)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -5157,6 +5157,9 @@ static int alc269_fill_coef(struct hda_codec *codec)
 
        if (spec->codec_variant != ALC269_TYPE_ALC269VB)
                return 0;
+       /* ALC271X doesn't seem to support these COEFs (bko#52181) */
+       if (!strcmp(codec->chip_name, "ALC271X"))
+               return 0;
 
        if ((alc_get_coef0(codec) & 0x00ff) < 0x015) {
                alc_write_coef_idx(codec, 0xf, 0x960b);