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drm/i915/guc: Don't clear the cookie on doorbell destroy

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If the HW has not processed the db invalidation request yet, clearing
the cookie can generate a db ring. We clear the cookie when we
(re-)allocate the doorbell so no need to do it on destroy as well as no
one is going to look at it while the doorbell is inactive

v2: fix typo in patch title (Michal)

Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20181002215430.15049-2-daniele.ceraolospurio@intel.com
This commit is contained in:
Daniele Ceraolo Spurio 2018-10-02 14:54:29 -07:00 committed by Chris Wilson
parent 48b426a9b9
commit 0fc645f338
1 changed files with 0 additions and 1 deletions
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drivers/gpu/drm/i915/intel_guc_submission.c
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@ -209,7 +209,6 @@ static void __destroy_doorbell(struct intel_guc_client *client)
doorbell = __get_doorbell(client);
doorbell->db_status = GUC_DOORBELL_DISABLED;
doorbell->cookie = 0;
/* Doorbell release flow requires that we wait for GEN8_DRB_VALID bit
* to go to zero after updating db_status before we call the GuC to