From 393004b2ea49524ee41a562cae8db67f50f372a5 Mon Sep 17 00:00:00 2001 From: Nitin Daga Date: Mon, 10 Jan 2011 21:49:31 +0530 Subject: [PATCH] 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 Acked-By: Stephen Warren Cc: Signed-off-by: Takashi Iwai --- sound/pci/hda/patch_hdmi.c | 42 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 8804c05b5fc7..f29b97b5de8f 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -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); }