ALSA: hda - Suppress the odd number of channels for HDMI

It looks like that HDMI codecs don't support the odd number of channels
although HD-audio spec doesn't have the restriction.  Add the
hw_constraint to limit to only the even number of channels.

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

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index f29b97b..2d28879 100644 (file)
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1238,6 +1238,9 @@ static int simple_playback_pcm_open(struct hda_pcm_stream *hinfo,
                snd_pcm_hw_constraint_list(substream->runtime, 0,
                                SNDRV_PCM_HW_PARAM_CHANNELS,
                                hw_constraints_channels);
+       } else {
+               snd_pcm_hw_constraint_step(substream->runtime, 0,
+                                          SNDRV_PCM_HW_PARAM_CHANNELS, 2);
        }
 
        return snd_hda_multi_out_dig_open(codec, &spec->multiout);