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authorWu Fengguang <fengguang.wu@intel.com>2009-02-11 07:22:29 (GMT)
committerTakashi Iwai <tiwai@suse.de>2009-02-11 08:08:59 (GMT)
commit606c0cee695bbd0c2bf32132999e35cff5a6dd9e (patch)
tree0e180183852098d0349eec5419f747d5ea2c8ca9 /sound
parenta1667e4eea0a7085815d1532d7630bb4611271d0 (diff)
downloadlinux-606c0cee695bbd0c2bf32132999e35cff5a6dd9e.tar.xz
ALSA: hda - enable HDMI audio pin out at module loading time
We found that enabling/disabling HDMI audio pin out at stream start/stop time will kill the leading 500ms or so sound samples. Avoid this by enabling pin out once and for ever at module loading time. The leading ~500ms audio samples will still be lost when switching from X-channel playback to Y-channel playback where X != Y. However there's no much we can do about it: the audio infoframe has to change and it looks like either G45 or YAMAHA requires some time to switch the configuration. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/patch_intelhdmi.c42
1 files changed, 19 insertions, 23 deletions
diff --git a/sound/pci/hda/patch_intelhdmi.c b/sound/pci/hda/patch_intelhdmi.c
index a864350..f2610d6 100644
--- a/sound/pci/hda/patch_intelhdmi.c
+++ b/sound/pci/hda/patch_intelhdmi.c
@@ -49,11 +49,6 @@ static struct hda_verb pinout_enable_verb[] = {
{} /* terminator */
};
-static struct hda_verb pinout_disable_verb[] = {
- {PIN_NID, AC_VERB_SET_PIN_WIDGET_CONTROL, 0x00},
- {}
-};
-
static struct hda_verb unsolicited_response_verb[] = {
{PIN_NID, AC_VERB_SET_UNSOLICITED_ENABLE, AC_USRSP_EN |
INTEL_HDMI_EVENT_TAG},
@@ -248,10 +243,6 @@ static void hdmi_write_dip_byte(struct hda_codec *codec, hda_nid_t nid,
static void hdmi_enable_output(struct hda_codec *codec)
{
- /* Enable Audio InfoFrame Transmission */
- hdmi_set_dip_index(codec, PIN_NID, 0x0, 0x0);
- snd_hda_codec_write(codec, PIN_NID, 0, AC_VERB_SET_HDMI_DIP_XMIT,
- AC_DIPXMIT_BEST);
/* Unmute */
if (get_wcaps(codec, PIN_NID) & AC_WCAP_OUT_AMP)
snd_hda_codec_write(codec, PIN_NID, 0,
@@ -260,17 +251,24 @@ static void hdmi_enable_output(struct hda_codec *codec)
snd_hda_sequence_write(codec, pinout_enable_verb);
}
-static void hdmi_disable_output(struct hda_codec *codec)
+/*
+ * Enable Audio InfoFrame Transmission
+ */
+static void hdmi_start_infoframe_trans(struct hda_codec *codec)
{
- snd_hda_sequence_write(codec, pinout_disable_verb);
- if (get_wcaps(codec, PIN_NID) & AC_WCAP_OUT_AMP)
- snd_hda_codec_write(codec, PIN_NID, 0,
- AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_MUTE);
+ hdmi_set_dip_index(codec, PIN_NID, 0x0, 0x0);
+ snd_hda_codec_write(codec, PIN_NID, 0, AC_VERB_SET_HDMI_DIP_XMIT,
+ AC_DIPXMIT_BEST);
+}
- /*
- * FIXME: noises may arise when playing music after reloading the
- * kernel module, until the next X restart or monitor repower.
- */
+/*
+ * Disable Audio InfoFrame Transmission
+ */
+static void hdmi_stop_infoframe_trans(struct hda_codec *codec)
+{
+ hdmi_set_dip_index(codec, PIN_NID, 0x0, 0x0);
+ snd_hda_codec_write(codec, PIN_NID, 0, AC_VERB_SET_HDMI_DIP_XMIT,
+ AC_DIPXMIT_DISABLE);
}
static int hdmi_get_channel_count(struct hda_codec *codec)
@@ -489,6 +487,7 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec,
hdmi_setup_channel_mapping(codec, &ai);
hdmi_fill_audio_infoframe(codec, &ai);
+ hdmi_start_infoframe_trans(codec);
}
@@ -566,7 +565,7 @@ static int intel_hdmi_playback_pcm_close(struct hda_pcm_stream *hinfo,
{
struct intel_hdmi_spec *spec = codec->spec;
- hdmi_disable_output(codec);
+ hdmi_stop_infoframe_trans(codec);
return snd_hda_multi_out_dig_close(codec, &spec->multiout);
}
@@ -586,8 +585,6 @@ static int intel_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
hdmi_setup_audio_infoframe(codec, substream);
- hdmi_enable_output(codec);
-
return 0;
}
@@ -632,8 +629,7 @@ static int intel_hdmi_build_controls(struct hda_codec *codec)
static int intel_hdmi_init(struct hda_codec *codec)
{
- /* disable audio output as early as possible */
- hdmi_disable_output(codec);
+ hdmi_enable_output(codec);
snd_hda_sequence_write(codec, unsolicited_response_verb);