ALSA: hda: Disable 4/6 channels on some NVIDIA GPUs.
Added hardware constraint in patch_hdmi.c to disable
channels 4/6 which are not supported by some older
NVIDIA GPUs.
Signed-off-by: Nitin Daga <ndaga@nvidia.com>
Acked-By: Stephen Warren <swarren@nvidia.com>
Cc: <stable@kernel.org>
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 8804c05..f29b97b 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1193,11 +1193,53 @@
return 0;
}
+static unsigned int channels_2_6_8[] = {
+ 2, 6, 8
+};
+
+static unsigned int channels_2_8[] = {
+ 2, 8
+};
+
+static struct snd_pcm_hw_constraint_list hw_constraints_2_6_8_channels = {
+ .count = ARRAY_SIZE(channels_2_6_8),
+ .list = channels_2_6_8,
+ .mask = 0,
+};
+
+static struct snd_pcm_hw_constraint_list hw_constraints_2_8_channels = {
+ .count = ARRAY_SIZE(channels_2_8),
+ .list = channels_2_8,
+ .mask = 0,
+};
+
static int simple_playback_pcm_open(struct hda_pcm_stream *hinfo,
struct hda_codec *codec,
struct snd_pcm_substream *substream)
{
struct hdmi_spec *spec = codec->spec;
+ struct snd_pcm_hw_constraint_list *hw_constraints_channels = NULL;
+
+ switch (codec->preset->id) {
+ case 0x10de0002:
+ case 0x10de0003:
+ case 0x10de0005:
+ case 0x10de0006:
+ hw_constraints_channels = &hw_constraints_2_8_channels;
+ break;
+ case 0x10de0007:
+ hw_constraints_channels = &hw_constraints_2_6_8_channels;
+ break;
+ default:
+ break;
+ }
+
+ if (hw_constraints_channels != NULL) {
+ snd_pcm_hw_constraint_list(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ hw_constraints_channels);
+ }
+
return snd_hda_multi_out_dig_open(codec, &spec->multiout);
}
