[Bug 56139] [bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Oct 31 12:13:52 PDT 2012


--- Comment #8 from Alex Deucher <agd5f at yahoo.com> ---
Created attachment 69370
  --> https://bugs.freedesktop.org/attachment.cgi?id=69370&action=edit
possible fix

(In reply to comment #7)
> Alex, would it be possible to print what is going on or if an error occurred
> in evergreen_mc_stop()?
> I see four things that could be going on:
> 1- we are not using the right path for CAYMAN -> (ASIC_IS_DCE6(rdev));

cayman is DCE5.  It is using the correct code path.

> 2- lock mechanism synced with vblank is not working properly;

Locking makes updates atomic rather than double buffered.

> 3- all the registers should be locked at the same time, then all modified
> and finally unlocked together, which is not done with the for loop where we
> move through each at a time;

doesn't matter.

> 4- we are not setting the right registers.

The existing sequence should be correct.  It's the same sequence our hw team
recommends.  I can't reproduce this on my cayman boards unfortunately and this
patch fixes the exact same problem you are having for a number of other people

Maybe an issue with the icon or cursor, but I think those should be disabled
when we disable mem requests in the crtc.  Does this patch help?

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