[ALSA] cmipci: add msbits constraint for 24-bit format

Add a msbits constraint to the SPDIF output device to indicate that
S32_LE samples use only 24 bits for data.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/pci/cmipci.c b/sound/pci/cmipci.c
index a8d6b54143fa..78a23984eac7 100644
--- a/sound/pci/cmipci.c
+++ b/sound/pci/cmipci.c
@@ -1599,8 +1599,10 @@ static int snd_cmipci_playback_spdif_open(struct snd_pcm_substream *substream)
                 return err;
         if (cm->can_ac3_hw) {
                 runtime->hw = snd_cmipci_playback_spdif;
-                if (cm->chip_version >= 37)
+                if (cm->chip_version >= 37) {
                         runtime->hw.formats |= SNDRV_PCM_FMTBIT_S32_LE;
+                        snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
+                }
                 if (cm->chip_version == 68) {
                         runtime->hw.rates |= SNDRV_PCM_RATE_88200 |
                                              SNDRV_PCM_RATE_96000;