From: Mengdong Lin <mengdong.lin@xxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
commit 300016b960661b4df63690177b22ba5426ff5706 upstream.
The function name not_share_unassigned_cvt() is opposite to what it does.
This patch renames it to intel_not_share_assigned_cvt(), and addes comments
to explain why some Intel display codecs need this workaround.
Signed-off-by: Mengdong Lin <mengdong.lin@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
sound/pci/hda/patch_hdmi.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index c476921ba277..1ab7bcfe02fc 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1161,7 +1161,16 @@ static int hdmi_choose_cvt(struct hda_codec *codec,
return 0;
}
-static void not_share_unassigned_cvt(struct hda_codec *codec,
+/* Intel HDMI workaround to fix audio routing issue:
+ * For some Intel display codecs, pins share the same connection list.
+ * So a conveter can be selected by multiple pins and playback on any of these
+ * pins will generate sound on the external display, because audio flows from
+ * the same converter to the display pipeline. Also muting one pin may make
+ * other pins have no sound output.
+ * So this function assures that an assigned converter for a pin is not selected
+ * by any other pins.
+ */
+static void intel_not_share_assigned_cvt(struct hda_codec *codec,
hda_nid_t pin_nid, int mux_idx)
{
struct hdmi_spec *spec = codec->spec;
@@ -1240,7 +1249,7 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
/* configure unused pins to choose other converters */
if (is_haswell(codec) || is_valleyview(codec))
- not_share_unassigned_cvt(codec, per_pin->pin_nid, mux_idx);
+ intel_not_share_assigned_cvt(codec, per_pin->pin_nid, mux_idx);
snd_hda_spdif_ctls_assign(codec, pin_idx, per_cvt->cvt_nid);
--
1.9.0
--
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