drm/i915/guc: Update GuC power domain states

We should update GuC power domain states also when GuC submission
is disabled, otherwise GuC might complain or ignore our requests.
This seems to be required for all currently released GuC firmwares.

v2: it is only needed by pre-Gen11 firmwares
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: John Spotswood <john.a.spotswood@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Tomasz Lis <tomasz.lis@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180910104150.101752-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/intel_uc.c

@@ -401,6 +401,10 @@ int intel_uc_init_hw(struct drm_i915_private *i915)
 		ret = intel_guc_submission_enable(guc);
 		if (ret)
 			goto err_communication;
+	} else if (INTEL_GEN(i915) < 11) {
+		ret = intel_guc_sample_forcewake(guc);
+		if (ret)
+			goto err_communication;
 	}
 
 	dev_info(i915->drm.dev, "GuC firmware version %u.%u\n",