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drm/i915/guc: remove writes to GEN8_DRBREG registers

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These registers are not actually writable by the CPU; only the GuC can
actually program them. So let's not do writes that have no effect.

Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Dave Gordon 2016-06-13 17:57:30 +01:00 committed by Tvrtko Ursulin
parent 072a21cfe0
commit dd16107f91
1 changed files with 0 additions and 5 deletions
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5
drivers/gpu/drm/i915/i915_guc_submission.c
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@ -252,14 +252,9 @@ static void guc_disable_doorbell(struct intel_guc *guc,
doorbell->db_status = GUC_DOORBELL_DISABLED;
I915_WRITE(drbreg, I915_READ(drbreg) & ~GEN8_DRB_VALID);
value = I915_READ(drbreg);
WARN_ON((value & GEN8_DRB_VALID) != 0);
I915_WRITE(GEN8_DRBREGU(client->doorbell_id), 0);
I915_WRITE(drbreg, 0);
/* XXX: wait for any interrupts */
/* XXX: wait for workqueue to drain */
}