[PATCH v2 2/2] ALSA: hda/realtek: Limit Legion AW88399 playback to stereo

[Aaron Ma <mapengyu@gmail.com>]

The Legion AW88399 speaker routing sends a stereo FL/FR stream
to both speaker pairs. A four-channel stream leaves the front
pair silent, so advertising four channels exposes an unusable
playback mode.

Limit the analogue PCM and the multi-output runtime constraint
to two channels for the affected Legion codec SSIDs. This
exposes the usable stereo configuration and rejects
four-channel playback.

Signed-off-by: Aaron Ma <mapengyu@gmail.com>
---
Changes in v2:
- Based on the original 2/3 (39adb275a45cd "Use quad channel map for
  Legion AW88399 speakers"), reworked: instead of advertising a quad
  channel map, playback is now limited to stereo because both speaker
  pairs carry the same stereo signal.

 sound/hda/codecs/realtek/alc269.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/hda/codecs/realtek/alc269.c b/sound/hda/codecs/realtek/alc269.c
index 30d71575bac3b..1231d9bfeeb16 100644
--- a/sound/hda/codecs/realtek/alc269.c
+++ b/sound/hda/codecs/realtek/alc269.c
@@ -3291,6 +3291,10 @@ static void alc287_fixup_legion_16iax10h_aw88399(struct hda_codec *codec,
 		spec->gen.suppress_auto_mic = 1;
 		snd_hda_override_conn_list(codec, 0x17, ARRAY_SIZE(conn), conn);
 		break;
+	case HDA_FIXUP_ACT_BUILD:
+		spec->gen.multiout.max_channels = 2;
+		spec->gen.pcm_rec[0]->stream[SNDRV_PCM_STREAM_PLAYBACK].channels_max = 2;
+		break;
 	}
 }
 
-- 
2.53.0