[alsa-devel] [PATCH 3/4] ALSA: hda - display audio call ncts callback

[libin.yang at intel.com]

From: Libin Yang <libin.yang at intel.com>

On some Intel platforms, display audio need set N/CTS
manually at some TMDS frequencies.

Signed-off-by: Libin Yang <libin.yang at intel.com>
---
 sound/pci/hda/patch_hdmi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index a97db5f..4bd11ff 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1786,6 +1786,8 @@ 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;
 
@@ -1802,6 +1804,11 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 		intel_not_share_assigned_cvt(codec, pin_nid, per_pin->mux_idx);
 	}
 
+	if (is_haswell_plus(codec)) {
+		if (acomp && acomp->ops && acomp->ops->set_ncts)
+			acomp->ops->set_ncts(acomp->dev, per_pin->pin_nid - 4,
+				0, runtime->rate);
+	}
 	non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
 	mutex_lock(&per_pin->lock);
 	per_pin->channels = substream->runtime->channels;
-- 
1.9.1