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ALSA: intelhdmi - sticky infoframe 

Remember the active infoframe, so as to avoid stop/restart infoframe
transmission when switching between audio clips of the same format.

Proposed by Shang and David.

CC: Shane W <shane-alsa@csy.ca>
CC: David Härdeman <david@hardeman.nu>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Wu Fengguang 2009-11-18 12:38:05 +08:00 committed by Takashi Iwai
parent 978be6d711
commit 848de598ee
1 changed files with 26 additions and 12 deletions
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38
sound/pci/hda/patch_intelhdmi.c
View File

@ -646,6 +646,27 @@ static void hdmi_setup_channel_mapping(struct hda_codec *codec, hda_nid_t nid,
hdmi_debug_channel_mapping(codec, nid);
}
static bool hdmi_infoframe_uptodate(struct hda_codec *codec, hda_nid_t pin_nid,
struct hdmi_audio_infoframe *ai)
{
u8 *bytes = (u8 *)ai;
u8 val;
int i;
if (snd_hda_codec_read(codec, pin_nid, 0, AC_VERB_GET_HDMI_DIP_XMIT, 0)
!= AC_DIPXMIT_BEST)
return false;
hdmi_set_dip_index(codec, pin_nid, 0x0, 0x0);
for (i = 0; i < sizeof(*ai); i++) {
val = snd_hda_codec_read(codec, pin_nid, 0,
AC_VERB_GET_HDMI_DIP_DATA, 0);
if (val != bytes[i])
return false;
}
return true;
}
static void hdmi_setup_audio_infoframe(struct hda_codec *codec, hda_nid_t nid,
struct snd_pcm_substream *substream)
@ -670,8 +691,11 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec, hda_nid_t nid,
continue;
pin_nid = spec->pin[i];
hdmi_fill_audio_infoframe(codec, pin_nid, &ai);
hdmi_start_infoframe_trans(codec, pin_nid);
if (!hdmi_infoframe_uptodate(codec, pin_nid, &ai)) {
hdmi_stop_infoframe_trans(codec, pin_nid);
hdmi_fill_audio_infoframe(codec, pin_nid, &ai);
hdmi_start_infoframe_trans(codec, pin_nid);
}
}
}
@ -767,16 +791,6 @@ static int intel_hdmi_playback_pcm_cleanup(struct hda_pcm_stream *hinfo,
struct hda_codec *codec,
struct snd_pcm_substream *substream)
{
struct intel_hdmi_spec *spec = codec->spec;
int i;
for (i = 0; i < spec->num_pins; i++) {
if (spec->pin_cvt[i] != hinfo->nid)
continue;
hdmi_stop_infoframe_trans(codec, spec->pin[i]);
}
snd_hda_codec_cleanup_stream(codec, hinfo->nid);
return 0;
}