On Fri, Aug 07, 2009 at 05:45:14PM +0800, Takashi Iwai wrote:
> At Fri, 7 Aug 2009 17:38:59 +0800,
> Wu Fengguang wrote:
> >
> > Hello,
> >
> > I'm not sure of the usage for GET_PROC_COEF/GET_COEF_INDEX, and found
> > that their return value is unstable (changing all the time) for codec:
> >
> > Codec: Realtek ALC888
> > Address: 2
> > Function Id: 0x1
> > Vendor Id: 0x10ec0888
> > Subsystem Id: 0x80860023
> > Revision Id: 0x100202
> >
> > For example:
> >
> > # hda-verb /dev/snd/hwC0D2 0x20 GET_PROC_COEF 0
> > nid = 0x20, verb = 0xc00, param = 0x0
> > value = 0x80
> > # hda-verb /dev/snd/hwC0D2 0x20 GET_COEF_INDEX 0
> > nid = 0x20, verb = 0xd00, param = 0x0
> > value = 0xe
> > # hda-verb /dev/snd/hwC0D2 0x20 GET_PROC_COEF 0
> > nid = 0x20, verb = 0xc00, param = 0x0
> > value = 0x9c00
> > # hda-verb /dev/snd/hwC0D2 0x20 GET_COEF_INDEX 0
> > nid = 0x20, verb = 0xd00, param = 0x0
> > value = 0xf
> >
> > I wonder if this is the normal case?
>
> AFAIK, depending on the mode, the index is incremented automatically.
Ah, yes. That's in line with the above data.
When repeatingly call GET_PROC_COEF, it returns some 'random' values:
# hda-verb /dev/snd/hwC0D2 0x20 GET_PROC_COEF 0
nid = 0x20, verb = 0xc00, param = 0x0
value = 0x4f
# hda-verb /dev/snd/hwC0D2 0x20 GET_PROC_COEF 0
nid = 0x20, verb = 0xc00, param = 0x0
value = 0x8000
# hda-verb /dev/snd/hwC0D2 0x20 GET_PROC_COEF 0
nid = 0x20, verb = 0xc00, param = 0x0
value = 0x2520
# hda-verb /dev/snd/hwC0D2 0x20 GET_PROC_COEF 0
nid = 0x20, verb = 0xc00, param = 0x0
value = 0x3e00
But when repeatingly call GET_COEF_INDEX, it returns the same value:
# hda-verb /dev/snd/hwC0D2 0x20 GET_COEF_INDEX 0
nid = 0x20, verb = 0xd00, param = 0x0
value = 0xd
# hda-verb /dev/snd/hwC0D2 0x20 GET_COEF_INDEX 0
nid = 0x20, verb = 0xd00, param = 0x0
value = 0xd
Thanks,
Fengguang
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