Dynamic clock cause hard lockup on Radeon 7000 + SMP

[Alex Deucher]

On Tue, 23 Nov 2004 15:01:08 -0500, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Tue, 23 Nov 2004 14:21:18 -0500, Kristian Høgsberg <krh at bitplanet.net> wrote:
> 
> 
> > Hi,
> >
> > I've been chasing a hard lockup that occurs on Radeon 7000 cards on SMP
> > boxes.  The lock up is typically triggered by high levels of drawing
> > activity, the gnome login process typically triggers it within 10
> > seconds, another way to reproduce is the pixbuf part of gtk-demo.  The
> > box locks up hard, it's not pingable and there is no response on a
> > serial console.  I was able to trace it down to the dynamic clock
> > feature, and if I remove the calls to RADEONSetDynamicClock in lines
> > 4511-4515 I can no longer reproduce the lockup.  I'm not sure what the
> > exact problem is, but I suspect some of the bits set in
> > RADEONSetDynamicClock could be undefined for RV100.  I don't have the
> > specs, so I'm only guessing.
> >
> > I'm using the attached patch in our RPMs to special case RV100s, but I'd
> > like to hear if others have better suggestions, and I would like to get
> > this into head and 6.8.2.
> >
> 
> This patch will disable dynamicclocks on all RV100 hardware including
> m6 which is what one of the chips on which is is most useful and
> doesn't seem to cause a problem.  I've done extensive testing on my m6
> and all is well there.  Unless we come up with a better fix, we should
> probably change the patch to
> 
> -            if ( !info->HasCRTC2 ) {
> +           if ((info->ChipFamily == CHIP_FAMILY_RV100) || !(info->IsMobility)) {
> +               break;
> +           } else if ( !info->HasCRTC2 ) {
> 
> I've also cc'ed Hui is case he has any ideas.
> 
> Alex
> 


ARGH!  sorry , I meant:

-            if ( !info->HasCRTC2 ) {
+           if ((info->ChipFamily == CHIP_FAMILY_RV100) &&
!(info->IsMobility)) {
+               break;
+           } else if ( !info->HasCRTC2 ) {

> 
> 
> > See:
> >         https://bugs.freedesktop.org/show_bug.cgi?id=1912
> >         https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=138108
> >
> > cheers,
> > Kristian
> >
> >
>