Patch "ALSA: hda - Fix headphone noise after Dell XPS 13 resume back from S3" has been added to the 4.3-stable tree

This is a note to let you know that I've just added the patch titled

ALSA: hda - Fix headphone noise after Dell XPS 13 resume back from S3

to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
alsa-hda-fix-headphone-noise-after-dell-xps-13-resume-back-from-s3.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Hui Wang <[email protected]>
Date: Tue, 24 Nov 2015 11:08:18 +0800
Subject: ALSA: hda - Fix headphone noise after Dell XPS 13 resume back from S3

From: Hui Wang <[email protected]>

commit 8c69729b4439bbda88c3073df7243f755cc418ed upstream.

We have a machine Dell XPS 13 with the codec alc256, after resume back from S3, the headphone has noise when play sound.

Through comparing with the coeff vaule before and after S3, we found restoring a coeff register will help remove noise.

---
 sound/pci/hda/patch_realtek.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

@@ -4597,6 +4597,7 @@ enum {
 	ALC292_FIXUP_DISABLE_AAMIX,
 	ALC298_FIXUP_DELL1_MIC_NO_PRESENCE,
 	ALC275_FIXUP_DELL_XPS,
+	ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE,
 };
 
 static const struct hda_fixup alc269_fixups[] = {

@@ -5177,6 +5178,17 @@ static const struct hda_fixup alc269_fix
 			{}
 		}
 	},
+	[ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE] = {
+		.type = HDA_FIXUP_VERBS,
+		.v.verbs = (const struct hda_verb[]) {
+			/* Disable pass-through path for FRONT 14h */
+			{0x20, AC_VERB_SET_COEF_INDEX, 0x36},
+			{0x20, AC_VERB_SET_PROC_COEF, 0x1737},
+			{}
+		},
+		.chained = true,
+		.chain_id = ALC255_FIXUP_DELL1_MIC_NO_PRESENCE
+	},
 };
 
 static const struct snd_pci_quirk alc269_fixup_tbl[] = {

@@ -5216,6 +5228,7 @@ static const struct snd_pci_quirk alc269
 	SND_PCI_QUIRK(0x1028, 0x06de, "Dell", ALC292_FIXUP_DISABLE_AAMIX),
 	SND_PCI_QUIRK(0x1028, 0x06df, "Dell", ALC292_FIXUP_DISABLE_AAMIX),
 	SND_PCI_QUIRK(0x1028, 0x06e0, "Dell", ALC292_FIXUP_DISABLE_AAMIX),
+	SND_PCI_QUIRK(0x1028, 0x0704, "Dell XPS 13", ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE),
 	SND_PCI_QUIRK(0x1028, 0x164a, "Dell", ALC293_FIXUP_DELL1_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1028, 0x164b, "Dell", ALC293_FIXUP_DELL1_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x103c, 0x1586, "HP", ALC269_FIXUP_HP_MUTE_LED_MIC2),

Patches currently in stable-queue which might be from [email protected] are

queue-4.3/alsa-hda-add-keycode-map-for-alc-input-device.patch queue-4.3/alsa-hda-add-mic-mute-hotkey-quirk-for-lenovo-thinkcentre-aio.patch queue-4.3/alsa-hda-fix-headphone-noise-after-dell-xps-13-resume-back-from-s3.patch queue-4.3/alsa-hda-fixing-speaker-noise-on-the-two-latest-thinkpad-models.patch