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Commit 393004b2 authored by Nitin Daga's avatar Nitin Daga Committed by Takashi Iwai
Browse files

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: default avatarNitin Daga <ndaga@nvidia.com>
Acked-By: default avatarStephen Warren <swarren@nvidia.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 0ebaa24c

sound/pci/hda/patch_hdmi.c

+42 −0
Original line number Diff line number Diff line
@@ -1193,11 +1193,53 @@ static int nvhdmi_7x_init(struct hda_codec *codec) 
	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);

}