[3.11.y.z extended stable] Patch "ALSA: hda - Mute all aamix inputs as default" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ALSA: hda - Mute all aamix inputs as default

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 88f6bc2a39489ce57047c4ad390733703101f0c8 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai at suse.de>
Date: Tue, 10 Dec 2013 17:33:49 +0100
Subject: ALSA: hda - Mute all aamix inputs as default

commit ebb93c057dda376414fbc499ad6ace9b527dff5a upstream.

Not all channels have been initialized, so far, especially when aamix
NID itself doesn't have amps but its leaves have.  This patch fixes
these holes.  Otherwise you might get unexpected loopback inputs,
e.g. from surround channels.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 sound/pci/hda/hda_generic.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index c6cb67b..bd7efe8 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -4246,6 +4246,26 @@ static unsigned int snd_hda_gen_path_power_filter(struct hda_codec *codec,
 	return AC_PWRST_D3;
 }

+/* mute all aamix inputs initially; parse up to the first leaves */
+static void mute_all_mixer_nid(struct hda_codec *codec, hda_nid_t mix)
+{
+	int i, nums;
+	const hda_nid_t *conn;
+	bool has_amp;
+
+	nums = snd_hda_get_conn_list(codec, mix, &conn);
+	has_amp = nid_has_mute(codec, mix, HDA_INPUT);
+	for (i = 0; i < nums; i++) {
+		if (has_amp)
+			snd_hda_codec_amp_stereo(codec, mix,
+						 HDA_INPUT, i,
+						 0xff, HDA_AMP_MUTE);
+		else if (nid_has_volume(codec, conn[i], HDA_OUTPUT))
+			snd_hda_codec_amp_stereo(codec, conn[i],
+						 HDA_OUTPUT, 0,
+						 0xff, HDA_AMP_MUTE);
+	}
+}

 /*
  * Parse the given BIOS configuration and set up the hda_gen_spec
@@ -4384,6 +4404,10 @@ int snd_hda_gen_parse_auto_config(struct hda_codec *codec,
 		}
 	}

+	/* mute all aamix input initially */
+	if (spec->mixer_nid)
+		mute_all_mixer_nid(codec, spec->mixer_nid);
+
  dig_only:
 	parse_digital(codec);

--
1.8.3.2