[alsa-devel] [PATCH] ALSA: hda: Disable 4/6 channels on some NVIDIA GPUs.

[Takashi Iwai]

At Mon, 10 Jan 2011 21:49:31 +0530,
Nitin Daga wrote:
> 
> 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 at nvidia.com>
> Acked-By: Stephen Warren <swarren at nvidia.com>

Applied now.  Thanks.


Takashi

> ---
>  pci/hda/patch_hdmi.c |   42 ++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 42 insertions(+), 0 deletions(-)
> 
> diff --git a/pci/hda/patch_hdmi.c b/pci/hda/patch_hdmi.c
> index d3e49aa..ddde59b 100644
> --- a/pci/hda/patch_hdmi.c
> +++ b/pci/hda/patch_hdmi.c
> @@ -1166,11 +1166,53 @@ 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);
>  }
>  
> -- 
> 1.7.0.4
> 
> 
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