drm/i915: Initialize hardware semaphore state on ring init

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Hardware status page needs to have proper seqno set
as our initial seqno can be arbitrary. If initial seqno is close
to wrap boundary on init and i915_seqno_passed() (31bit space)
refers to hw status page which contains zero, errorneous result
will be returned.

v2: clear mboxes and set hws page directly instead of going
through rings. Suggested by Chris Wilson.

v3: hws needs to be updated for all gens. Noticed by Chris
Wilson.

References: https://bugs.freedesktop.org/show_bug.cgi?id=58230
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Mika Kuoppala 2012-12-19 11:13:06 +02:00 • committed by Daniel Vetter

parent b70ec5bf43

commit f7e98ad4d4

3 changed files with 13 additions and 21 deletions

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8

drivers/gpu/drm/i915/i915_gem.c

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24

drivers/gpu/drm/i915/intel_ringbuffer.c

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2

drivers/gpu/drm/i915/intel_ringbuffer.h

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