[PATCH 3.2 081/200] ALSA: hda/realtek - Avoid invalid COEFs for ALC271X

[Ben Hutchings]

3.2.56-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@xxxxxxx>

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@xxxxxxx>
[bwh: Backported to 3.2: return 0]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 sound/pci/hda/patch_realtek.c | 3 +++
 1 file changed, 3 insertions(+)

--- 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_c
 
 	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);

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