[Utopic PATCH 1/2] ALSA: hda - Fix audio crackles on Dell Latitude E7x40

[Hui Wang]

From: Takashi Iwai <tiwai at suse.de>

BugLink: http://bugs.launchpad.net/bugs/1468582

We still got a report that the audio crackles and noises occur with
the recent 4.1 kernels on Dell machines.  These machines seem to need
similar workarounds that have been applied to the recent Dell XPS 13
models.  Since the codec of these machines (Dell Latitute E7240 and
E7440) is different from XPS 13's one, we need a new fixup entry.

Also, it was confirmed that the previous workaround to disable the
widget power-save (commit [219f47e4f964: ALSA: hda - Disable widget
power-saving for ALC292 & co]) is no longer needed after this fix.
So, this patch includes the partial revert of the commit, too.

Reported-and-tested-by: Mihai Don<C8><9B>u <mihai.dontu at gmail.com>
Tested-by: Jonathan McDowell <noodles at earth.li>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
(backport from commit 8b99aba70c5f581860736855e211cf981f438ad2)

[drop the part of adding the PCI_QURIK since those two machines have
their mic presence quirk in the 3.16 kernel. And also drop the part
of changing power_save_node, since there is no this feature in 3.16
kernel yet.]
Reviewed-by: Liming Wang <liming.wang at canonical.com>
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
 sound/pci/hda/patch_realtek.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index a10d51c..0e29f1f 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -4317,6 +4317,8 @@ enum {
 	ALC293_FIXUP_DELL1_MIC_NO_PRESENCE,
 	ALC292_FIXUP_TPT440_DOCK,
 	ALC255_FIXUP_DELL_WMI_MIC_MUTE_LED,
+	ALC292_FIXUP_DELL_E7X,
+	ALC292_FIXUP_DISABLE_AAMIX,
 };
 
 static const struct hda_fixup alc269_fixups[] = {
@@ -4758,6 +4760,16 @@ static const struct hda_fixup alc269_fixups[] = {
 		.type = HDA_FIXUP_FUNC,
 		.v.func = alc_fixup_dell_wmi,
 	},
+	[ALC292_FIXUP_DISABLE_AAMIX] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc_fixup_disable_aamix,
+	},
+	[ALC292_FIXUP_DELL_E7X] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc_fixup_dell_xps13,
+		.chained = true,
+		.chain_id = ALC292_FIXUP_DISABLE_AAMIX
+	},
 };
 
 static const struct snd_pci_quirk alc269_fixup_tbl[] = {
-- 
1.9.1