1 files changed, 19 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index acbfbe087ee8..3a2d4a5a1714 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1775,6 +1775,16 @@ static bool check_non_pcm_per_cvt(struct hda_codec *codec, hda_nid_t cvt_nid)
         return non_pcm;
 }
 
+/* There is a fixed mapping between audio pin node and display port
+ * on current Intel platforms:
+ * Pin Widget 5 - PORT B (port = 1 in i915 driver)
+ * Pin Widget 6 - PORT C (port = 2 in i915 driver)
+ * Pin Widget 7 - PORT D (port = 3 in i915 driver)
+ */
+static int intel_pin2port(hda_nid_t pin_nid)
+{
+        return pin_nid - 4;
+}
 
 /*
  * HDMI callbacks
@@ -1791,6 +1801,8 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
         int pin_idx = hinfo_to_pin_index(codec, hinfo);
         struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
         hda_nid_t pin_nid = per_pin->pin_nid;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct i915_audio_component *acomp = codec->bus->core.audio_component;
         bool non_pcm;
         int pinctl;
 
@@ -1807,6 +1819,13 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
                 intel_not_share_assigned_cvt(codec, pin_nid, per_pin->mux_idx);
         }
 
+        /* Call sync_audio_rate to set the N/CTS/M manually if necessary */
+        /* Todo: add DP1.2 MST audio support later */
+        if (acomp && acomp->ops && acomp->ops->sync_audio_rate)
+                acomp->ops->sync_audio_rate(acomp->dev,
+                                intel_pin2port(pin_nid),
+                                runtime->rate);
+
         non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
         mutex_lock(&per_pin->lock);
         per_pin->channels = substream->runtime->channels;