From 2df6742f613840a0b0a1590fb28f7af5b058a673 Mon Sep 17 00:00:00 2001
From: Mengdong Lin <mengdong.lin@intel.com>
Date: Thu, 20 Mar 2014 13:01:06 +0800
Subject: [PATCH] ALSA: hda - verify pin:cvt connection on preparing a stream for Intel HDMI codec
Git-commit: 2df6742f613840a0b0a1590fb28f7af5b058a673
Patch-mainline: 3.15-rc1
References: FATE#317933

This is a temporary fix for some Intel HDMI codecs to avoid no sound output for
a resuming playback after S3.

After S3, the audio driver restores pin:cvt connection selections by
snd_hda_codec_resume_cache(). However this can happen before the gfx side is
ready and such connect selection is overlooked by HW. After gfx is ready, the
pins make the default selection again. And this will cause multiple pins share
a same convertor and mute control will affect each other. Thus a resumed audio
playback become silent after S3.

This patch verifies pin:cvt connection on preparing a stream, to assure the pin
selects the right convetor and an assigned convertor is not shared by other
unused pins. Apply this fix-up on Haswell, Broadwell and Valleyview (Baytrail).

We need this temporary fix before a reliable software communication channel is
established between audio and gfx, to sync audio/gfx operations.

Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/pci/hda/patch_hdmi.c |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -74,6 +74,7 @@ struct hdmi_spec_per_pin {
 	hda_nid_t pin_nid;
 	int num_mux_nids;
 	hda_nid_t mux_nids[HDA_MAX_CONNECTIONS];
+	int mux_idx;
 
 	struct hda_codec *codec;
 	struct hdmi_eld sink_eld;
@@ -973,6 +974,8 @@ static int hdmi_choose_cvt(struct hda_co
 	if (cvt_idx == spec->num_cvts)
 		return -ENODEV;
 
+	per_pin->mux_idx = mux_idx;
+
 	if (cvt_id)
 		*cvt_id = cvt_idx;
 	if (mux_id)
@@ -981,6 +984,22 @@ static int hdmi_choose_cvt(struct hda_co
 	return 0;
 }
 
+/* Assure the pin select the right convetor */
+static void intel_verify_pin_cvt_connect(struct hda_codec *codec,
+			struct hdmi_spec_per_pin *per_pin)
+{
+	hda_nid_t pin_nid = per_pin->pin_nid;
+	int mux_idx, curr;
+
+	mux_idx = per_pin->mux_idx;
+	curr = snd_hda_codec_read(codec, pin_nid, 0,
+					  AC_VERB_GET_CONNECT_SEL, 0);
+	if (curr != mux_idx)
+		snd_hda_codec_write_cache(codec, pin_nid, 0,
+					    AC_VERB_SET_CONNECT_SEL,
+					    mux_idx);
+}
+
 /* 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
@@ -1353,6 +1372,19 @@ static int generic_hdmi_playback_pcm_pre
 	hda_nid_t pin_nid = per_pin->pin_nid;
 	bool non_pcm;
 
+	if (is_haswell_plus(codec) || is_valleyview(codec)) {
+		/* Verify pin:cvt selections to avoid silent audio after S3.
+		 * After S3, the audio driver restores pin:cvt selections
+		 * but this can happen before gfx is ready and such selection
+		 * is overlooked by HW. Thus multiple pins can share a same
+		 * default convertor and mute control will affect each other,
+		 * which can cause a resumed audio playback become silent
+		 * after S3.
+		 */
+		intel_verify_pin_cvt_connect(codec, per_pin);
+		intel_not_share_assigned_cvt(codec, pin_nid, per_pin->mux_idx);
+	}
+
 	non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
 	per_pin->channels = substream->runtime->channels;
 	per_pin->setup = true;
