ALSA: hda - set up HDMI channels

Set up channel information for HDMI widgets.  This will allow LPCM
with multiple channels supported on some HDMI devices.

TODO: It still doesn't check ELD and doesn't change PCM parameters
dynamically.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/hda/patch_atihdmi.c

@@ -35,6 +35,9 @@ struct atihdmi_spec {
 	struct hda_pcm pcm_rec;
 };
 
+#define CVT_NID		0x02	/* audio converter */
+#define PIN_NID		0x03	/* HDMI output pin */
+
 static struct hda_verb atihdmi_basic_init[] = {
 	/* enable digital output on pin widget */
 	{ 0x03, AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_OUT },
@@ -60,8 +63,9 @@ static int atihdmi_init(struct hda_codec *codec)
 {
 	snd_hda_sequence_write(codec, atihdmi_basic_init);
 	/* SI codec requires to unmute the pin */
-	if (get_wcaps(codec, 0x03) & AC_WCAP_OUT_AMP)
-		snd_hda_codec_write(codec, 0x03, 0, AC_VERB_SET_AMP_GAIN_MUTE,
+	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_UNMUTE);
 	return 0;
 }
@@ -92,15 +96,29 @@ static int atihdmi_dig_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 					    struct snd_pcm_substream *substream)
 {
 	struct atihdmi_spec *spec = codec->spec;
-	return snd_hda_multi_out_dig_prepare(codec, &spec->multiout, stream_tag,
+	int chans = substream->runtime->channels;
+	int i, err;
+
+	err = snd_hda_multi_out_dig_prepare(codec, &spec->multiout, stream_tag,
 					    format, substream);
+	if (err < 0)
+		return err;
+	snd_hda_codec_write(codec, CVT_NID, 0, AC_VERB_SET_CVT_CHAN_COUNT,
+			    chans - 1);
+	/* FIXME: XXX */
+	for (i = 0; i < chans; i++) {
+		snd_hda_codec_write(codec, CVT_NID, 0,
+				    AC_VERB_SET_HDMI_CHAN_SLOT,
+				    (i << 4) | i);
+	}
+	return 0;
 }
 
 static struct hda_pcm_stream atihdmi_pcm_digital_playback = {
 	.substreams = 1,
 	.channels_min = 2,
 	.channels_max = 2,
-	.nid = 0x2, /* NID to query formats and rates and setup streams */
+	.nid = CVT_NID, /* NID to query formats and rates and setup streams */
 	.ops = {
 		.open = atihdmi_dig_playback_pcm_open,
 		.close = atihdmi_dig_playback_pcm_close,
@@ -112,6 +130,7 @@ static int atihdmi_build_pcms(struct hda_codec *codec)
 {
 	struct atihdmi_spec *spec = codec->spec;
 	struct hda_pcm *info = &spec->pcm_rec;
+	unsigned int chans;
 
 	codec->num_pcms = 1;
 	codec->pcm_info = info;
@@ -120,6 +139,13 @@ static int atihdmi_build_pcms(struct hda_codec *codec)
 	info->pcm_type = HDA_PCM_TYPE_HDMI;
 	info->stream[SNDRV_PCM_STREAM_PLAYBACK] = atihdmi_pcm_digital_playback;
 
+	/* FIXME: we must check ELD and change the PCM parameters dynamically
+	 */
+	chans = get_wcaps(codec, CVT_NID);
+	chans = (chans & AC_WCAP_CHAN_CNT_EXT) >> 13;
+	chans = ((chans << 1) | 1) + 1;
+	info->stream[SNDRV_PCM_STREAM_PLAYBACK].channels_max = chans;
+
 	return 0;
 }
 
@@ -147,9 +173,11 @@ static int patch_atihdmi(struct hda_codec *codec)
 
 	spec->multiout.num_dacs = 0;	  /* no analog */
 	spec->multiout.max_channels = 2;
-	spec->multiout.dig_out_nid = 0x2; /* NID for copying analog to digital,
+	/* NID for copying analog to digital,
 	 * seems to be unused in pure-digital
-					   * case. */
+	 * case.
+	 */
+	spec->multiout.dig_out_nid = CVT_NID;
 
 	codec->patch_ops = atihdmi_patch_ops;
 
@@ -164,6 +192,7 @@ struct hda_codec_preset snd_hda_preset_atihdmi[] = {
 	{ .id = 0x10027919, .name = "ATI RS600 HDMI", .patch = patch_atihdmi },
 	{ .id = 0x1002791a, .name = "ATI RS690/780 HDMI", .patch = patch_atihdmi },
 	{ .id = 0x1002aa01, .name = "ATI R6xx HDMI", .patch = patch_atihdmi },
+	{ .id = 0x10951390, .name = "SiI1390 HDMI", .patch = patch_atihdmi },
 	{ .id = 0x10951392, .name = "SiI1392 HDMI", .patch = patch_atihdmi },
 	{ .id = 0x17e80047, .name = "Chrontel HDMI",  .patch = patch_atihdmi },
 	{} /* terminator */