[alsa-devel] [PATCH] ALSA: hda - Turn on PIN_OUT from hdmi playback prepare.

Dylan Reid dgreid at chromium.org
Thu Jul 19 11:19:11 CEST 2012

Turn on the pin widget's PIN_OUT bit from playback prepare. The pin is
enabled in open, but is disabled in hdmi_init_pin which is called during
system resume. This causes a system suspend/resume during playback to
mute HDMI/DP. Enabling the pin in prepare allows calling snd_pcm_prepare
after a system resume to restore audio.

Signed-off-by: Dylan Reid <dgreid at chromium.org>
 sound/pci/hda/patch_hdmi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 0b4a1ea..c53f99c 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1153,11 +1153,17 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 	struct hdmi_spec *spec = codec->spec;
 	int pin_idx = hinfo_to_pin_index(spec, hinfo);
 	hda_nid_t pin_nid = spec->pins[pin_idx].pin_nid;
+	int pinctl;
 	hdmi_set_channel_count(codec, cvt_nid, substream->runtime->channels);
 	hdmi_setup_audio_infoframe(codec, pin_idx, substream);
+	pinctl = snd_hda_codec_read(codec, pin_nid, 0,
+	snd_hda_codec_write(codec, pin_nid, 0,
 	return hdmi_setup_stream(codec, cvt_nid, pin_nid, stream_tag, format);

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