linux-kernel - [015/129] ALSA: hda - Fix the detection of "Loopback Mixing" control for VIA codecs

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Date:	Mon, 23 Jan 2012 18:33:55 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Takashi Iwai <tiwai@...e.de>
Subject: [015/129] ALSA: hda - Fix the detection of "Loopback Mixing" control for VIA codecs

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 1227
Lines: 35

From: Takashi Iwai <tiwai@...e.de>

commit 4808d12d1dddb046ec86425e5f6766f02e950292 upstream.

Currently the driver checks only the out_mix_path[] for the primary
output route for judging whether to create the loopback-mixing control
or not.  But, there are cases where aamix-routing is available only on
headphone or speaker paths but not on the primary output path.  So, the
driver ignores such cases inappropriately.

This patch fixes the check of the loopback-mixing control by testing
all mix-routing paths.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/pci/hda/patch_via.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -2200,7 +2200,10 @@ static int via_auto_create_loopback_swit
 {
 	struct via_spec *spec = codec->spec;
 
-	if (!spec->aa_mix_nid || !spec->out_mix_path.depth)
+	if (!spec->aa_mix_nid)
+		return 0; /* no loopback switching available */
+	if (!(spec->out_mix_path.depth || spec->hp_mix_path.depth ||
+	      spec->speaker_path.depth))
 		return 0; /* no loopback switching available */
 	if (!via_clone_control(spec, &via_aamix_ctl_enum))
 		return -ENOMEM;


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