drm/i915: Implement w/a for sporadic read failures on waking from rc6

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As a w/a to prevent reads sporadically returning 0, we need to wait for
the GT thread to return to TC0 before proceeding to read the registers.

v2: adapt for Haswell changes (Eugeni).

v3: use wait_for_atomic_us for thread status polling.

v3: *really* use wait_for_atomic for polling.

References: https://bugs.freedesktop.org/show_bug.cgi?id=50243
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Chris Wilson 2012-07-02 11:51:03 -03:00 • committed by Daniel Vetter

parent 990bbdadab

commit c4de7b0ffd

2 changed files with 26 additions and 0 deletions

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22

drivers/gpu/drm/i915/i915_drv.c

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4

drivers/gpu/drm/i915/i915_reg.h

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