[alsa-devel] [PATCH] ALSA: hda_intel: disable corb rirb when single_cmd active
tiwai at suse.de
Thu Nov 5 08:04:46 CET 2009
At Wed, 04 Nov 2009 12:45:20 -0700,
Troy Kisky wrote:
> 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.
This is odd. Something is already wrong, then.
> 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."
I know this, but actually this never be a problem in the real
hardware. So, it's left there.
> 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.
It's not dead but living-dead :)
The single_cmd mode is really only for debugging. It's never for any
More information about the Alsa-devel