ALSA: hda - Make converter setups sticky

So far, we reset the converter setups like the stream-tag, the
channel-id and format-id in prepare callbacks, and clear them in
cleanup callbacks.  This often causes a silence of the digital
receiver for a couple of seconds.

This patch tries to delay the converter setup changes as much as
possible.  The converter setups are cached and aren't reset as long
as the same values are used.  At suspend/resume, they are cleared
to be recovered properly, too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 0328cf55cdba..3f7a479881e5 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -826,12 +826,14 @@ struct hda_codec {
 
 	struct mutex spdif_mutex;
 	struct mutex control_mutex;
+	struct mutex prepare_mutex;
 	unsigned int spdif_status;	/* IEC958 status bits */
 	unsigned short spdif_ctls;	/* SPDIF control bits */
 	unsigned int spdif_in_enable;	/* SPDIF input enable? */
 	hda_nid_t *slave_dig_outs; /* optional digital out slave widgets */
 	struct snd_array init_pins;	/* initial (BIOS) pin configurations */
 	struct snd_array driver_pins;	/* pin configs set by codec parser */
+	struct snd_array cvt_setups;	/* audio convert setups */
 
 #ifdef CONFIG_SND_HDA_HWDEP
 	struct snd_hwdep *hwdep;	/* assigned hwdep device */
@@ -948,6 +950,16 @@ int snd_hda_codec_build_controls(struct hda_codec *codec);
  */
 int snd_hda_build_pcms(struct hda_bus *bus);
 int snd_hda_codec_build_pcms(struct hda_codec *codec);
+
+int snd_hda_codec_prepare(struct hda_codec *codec,
+			  struct hda_pcm_stream *hinfo,
+			  unsigned int stream,
+			  unsigned int format,
+			  struct snd_pcm_substream *substream);
+void snd_hda_codec_cleanup(struct hda_codec *codec,
+			   struct hda_pcm_stream *hinfo,
+			   struct snd_pcm_substream *substream);
+
 void snd_hda_codec_setup_stream(struct hda_codec *codec, hda_nid_t nid,
 				u32 stream_tag,
 				int channel_id, int format);