drm/i915: fix rc6 initialization on Ironlake

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There is a race condition between setting PWRCTXA and executing
MI_SET_CONTEXT. PWRCTXA must not be set until a valid context has been
written (or else the GPU could possible go into rc6, and return to an
invalid context).

Reported-and-Tested-by: Gu Rui <chaos.proton@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=28582
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Keith Packard <keithp@keithp.com>

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Ben Widawsky 2011-03-19 18:14:28 -07:00 • committed by Keith Packard

parent 96f298aa9c

commit 4a246cfc3c

1 changed files with 13 additions and 0 deletions

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drivers/gpu/drm/i915/intel_display.c

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