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由 Chris Wilson 提交于
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=50243Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NEugeni Dodonov <eugeni.dodonov@intel.com> Acked-by: NBen Widawsky <ben@bwidawsk.net> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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