On Wed, May 12, 2010 at 10:35:46PM +0800, Takashi Iwai wrote:
> At Wed, 12 May 2010 09:30:17 +0800,
> Wu Fengguang wrote:
> >
> > Currently AZX_MAX_CODECS is defined to 8. Increase it to 10 in order to
> > support the HDMI device indices {3, 7, 8, 9}.
>
> If I understand correctly, the codec slot number is basically
> independent from the PCM device number assigned. Hence this change
> shouldn't be necessary unless you really have more than 8 codec
> chips. Or will be such a high codec address expected soon on new
> Intel platforms?
You are right, it works without this patch. Sorry for the confusion!
> > The HD audio spec allows up to 14 codecs. So we are still within the
> > hardware capacity.
>
> I thought this was at most 8, so I used the value 0x100 as a special
> bit flag for probe_mask module option :-<
> We'd need to change this if we extend the max codecs...
It may allow 15 codecs in fact. I get the max number from "Figure 32.
Codec Address Assignment Frame":
CODEC Samples Address ** Address 15 is reserved for
0 1 2 3 ......... 14 link protocol purposes and
may not be assigned to
CODECs
And STATESTS has bits 14:0 allocated for "SDIN State Change Status Flags
(SDIWAKE)".
However we don't need to increase AZX_MAX_CODECS and probe_mask for now.
Thanks,
Fengguang
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