yes, your patch fixed the glxgears-lockup for me, too. Thanks! It looks like this is only necessary on RV200 based chips, maybe a comment in the source about this behavior might be usefull, otherwise this workaround will get removed in the future again... because other radeons work well without it...
If its only RV200 I'll put a check in as I think this may be an expensive workaround.... I'll get some more time this week to work on it, (I actually got paid hourly to track this down so staring at it for two days wasn't as bad as it could have been :-)
I'll cook up a proper patch.. Keith you know why this is needed (sounds like you might know why zbs should be emitted considering none of my rv200 docs mention it) ... is it acting like a nop or does it do something ...
No, I never knew why it was necessary - presumably it is forcing a flush somewhere in the hardware as a sideeffect. Zbias is a fairly unused piece of state so might not be pipelined to the degree of other more common state changes. Possibly there's a hardware or driver bug that raises its head if we don't do this additional pipeline flushing.
Anyway, that's all speculation. I found the workaround by trial and error and it seems to still be necessary.
Keith
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