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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>
This commit is contained in:
Wu Fengguang 2009-02-11 15:22:29 +08:00 committed by Takashi Iwai
parent a1667e4eea
commit 606c0cee69
1 changed files with 19 additions and 23 deletions
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42
sound/pci/hda/patch_intelhdmi.c
View File

@ -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);