[alsa-devel] SPDIF/IEC958 sample rate on HDA/ALC882

Dag Lem dag at nimrod.no
Thu Mar 22 14:11:21 CET 2007

Dag Lem <dag at nimrod.no> writes:

> Dominique Dumont <domi.dumont at free.fr> writes:


> > The verb used in snd-hda-intel are 0x200 and 0x300 where Intel's and
> > Realtek's doc specify 2h and 3h.
> Hmm, that one escaped me. If this is a problem with hda_codec.h and
> not with the documentation, then there are more errors:
> #define AC_VERB_GET_STREAM_FORMAT               0x0a00  -> 0x000a
> #define AC_VERB_GET_AMP_GAIN_MUTE               0x0b00  -> 0x000b
> #define AC_VERB_GET_PROC_COEF                   0x0c00  -> 0x000c
> #define AC_VERB_GET_COEF_INDEX                  0x0d00  -> 0x000d
> #define AC_VERB_SET_STREAM_FORMAT               0x200  -> 0x002
> #define AC_VERB_SET_AMP_GAIN_MUTE               0x300  -> 0x003
> #define AC_VERB_SET_PROC_COEF                   0x400  -> 0x004
> #define AC_VERB_SET_COEF_INDEX                  0x500  -> 0x005

Reading the documentation again it all seems correct to me. The verbs
above are "4-Bit verbs", which are correctly shifted in order to
assemble 40-Bit commands in hda_intel.c:azx_corb_send_cmd()

Now azx_corb_send_cmd() seems to use an on-chip command buffer. I'm
going to try to use azx_single_send_cmd() instead tonight (module
parameter single_cmd=1), to see whether this makes any difference.

Best regards,

Dag Lem

More information about the Alsa-devel mailing list