[alsa-devel] [PATCH] ALSA: hda_intel: disable corb rirb when single_cmd active

[Troy Kisky]

Takashi Iwai wrote:
> At Tue,  3 Nov 2009 12:22:37 -0700,
> Troy Kisky wrote:
>> Poulsbo(US15W) cannot have any corb registers initialized
>> when using single_cmd mode.
>> When send_cmd timeout occur, note error.
> 
> Could you be more specific?  What errors do you get?
> 
> And, how it goes to single_cmd mode?  The single_cmd mode is very last
> resort, and reaching there means already a serious problem.
> 
> 
> thanks,
> 
> Takashi
> 
No error messages, but the response read is always 0.
For testing, I passed single_cmd=1 as a modules option.

HDAudio_03.pdf says, "If implemented, these registers must not be used
at the same time as the CORB and RIRB command/response mechanisms, as the operations
will conflict."

Plus, if the RIRB irq is enabled, the interrupt routine will print out a
spurious interrupt message.

That said, my hardware is switching to single_cmd eventually, even if not
passed as a module option. But at least now, when that happens my audio
isn't dead.

Troy