Wei Ni kirjoitti tiistai, 27. heinäkuuta 2010 10:14:37:
> Hi, Takashi
> MCP7x use old HW design in HDMI, they don't support channel mapping like
> MCP89. It use nvhdmi_dig_playback_pcm_prepare_8ch() to prepare channel
> mapping and steam id,format.
>
> Anssi Hannula
> Please try the following changes in patch_nvhdmi.c
> static hda_nid_t nvhdmi_con_nids_7x[4] = {
> /*front, rear, clfe, rear_surr */
> - 0x6, 0x8, 0xa, 0xc,
> + 0x6, 0xa, 0x8, 0xc,
> };
I actually tried that already, but for some reason changing the order in
nvhdmi_con_nids_7x doesn't have any effect.
Actually, disabling the whole for loop that assigns the channels in
nvhdmi_dig_playback_pcm_prepare_8ch() has no effect, leading me to believe
that the commands are not reaching the hardware or they are being overridden.
I also just noticed that the HDMI output is the only detected output, even
though this board has analog audio and S/PDIF outputs as well. I'm not sure if
this is related or not.
> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@xxxxxxx]
> Sent: Monday, July 26, 2010 5:35 PM
> To: Anssi Hannula
> Cc: alsa-devel@xxxxxxxxxxxxxxxx; Wei Ni
> Subject: Re: Wrong channel order with multichannel HDMI on
> MCP7A
>
> At Mon, 26 Jul 2010 11:14:17 +0200,
>
> 私 wrote:
> > At Sun, 25 Jul 2010 19:51:39 +0300,
> >
> > Anssi Hannula wrote:
> > > Hi all!
> > >
> > > I have a motherboard with NVIDIA MCP7A HDMI audio.
> > > However, multichannel audio is not mapped properly into the HDMI order.
> > >
> > > On 5.1, I get RL in FC, RR in LFE, FC in RL, LFE in RR.
> > >
> > > Interestingly, this is not consistent with the ALSA channel order (FL
> > > FR RL RR FC LFE) being passed directly to HDMI (FL FR LFE FC RL RR).
> > > Instead it looks like there has been a waveformatex (FL FR FC LFE RL
> > > RR; windows?) => HDMI conversion instead of ALSA => HDMI.
> > >
> > > Same happens for 7.1.
> > >
> > > Is it possible to set the hardware to do an ALSA => HDMI conversion
> > > instead? If not, we should manually compensate for this somewhere,
> > > right?
> >
> > Does the patch below change anything?
>
> Ah crap, it should be irrelevant.
> Wei, don't MCP 7x chips support the channel mapping as MCP 89?
>
>
> thanks,
>
> Takashi
>
> > > Somewhat relatedly, trying to output 4 channels results in silence
> > > only.
> >
> > Although 5.1/7.1 work?
> >
> > > Trying to output 3 or 5 channels triggers a timeout with I/O error,
> > > with the following in the kernel log: "ALSA pcm_lib.c:1757: playback
> > > write error (DMA or IRQ trouble?)"
> >
> > HD-audio doesn't support the odd number of channels in general, so
> > they should be played as 4 or 6 channels. But, it looks like
> > something wrong in the setup...
> >
> >
> > thanks,
> >
> > Takashi
> >
> > ---
> > diff --git a/sound/pci/hda/patch_nvhdmi.c b/sound/pci/hda/patch_nvhdmi.c
> > index 3c10c0b..7355c60 100644
> > --- a/sound/pci/hda/patch_nvhdmi.c
> > +++ b/sound/pci/hda/patch_nvhdmi.c
> > @@ -511,6 +511,8 @@ static int patch_nvhdmi_8ch_7x(struct hda_codec
> > *codec)
> >
> > codec->patch_ops = nvhdmi_patch_ops_8ch_7x;
> >
> > + init_channel_allocations();
> > +
> >
> > return 0;
> >
> > }
>
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--
Anssi Hannula
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