drm/i915: Make intel_uc_sanitize_options() more robust

After negative guc fw selection we could leave guc
submission flag still turned on. Reorder some checks
to cover this case. While here, fix info message and
return early if there is no Guc.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
[tursulin: fixup bad alignment]
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170315133741.150420-1-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/intel_uc.c

@@ -50,23 +50,20 @@ static int __intel_uc_reset_hw(struct drm_i915_private *dev_priv)
 void intel_uc_sanitize_options(struct drm_i915_private *dev_priv)
 {
 	if (!HAS_GUC(dev_priv)) {
-		if (i915.enable_guc_loading > 0)
-			DRM_INFO("Ignoring GuC options, no hardware");
+		if (i915.enable_guc_loading > 0 ||
+		    i915.enable_guc_submission > 0)
+			DRM_INFO("Ignoring GuC options, no hardware\n");
 
 		i915.enable_guc_loading = 0;
 		i915.enable_guc_submission = 0;
-	} else {
-		/* A negative value means "use platform default" */
-		if (i915.enable_guc_loading < 0)
-			i915.enable_guc_loading = HAS_GUC_UCODE(dev_priv);
-		if (i915.enable_guc_submission < 0)
-			i915.enable_guc_submission = HAS_GUC_SCHED(dev_priv);
-
-		/* Can't enable guc submission without guc loaded */
-		if (!i915.enable_guc_loading)
-			i915.enable_guc_submission = 0;
+		return;
 	}
 
+	/* A negative value means "use platform default" */
+	if (i915.enable_guc_loading < 0)
+		i915.enable_guc_loading = HAS_GUC_UCODE(dev_priv);
+
+	/* Verify firmware version */
 	if (i915.enable_guc_loading) {
 		if (HAS_HUC_UCODE(dev_priv))
 			intel_huc_select_fw(&dev_priv->huc);
@@ -74,6 +71,14 @@ void intel_uc_sanitize_options(struct drm_i915_private *dev_priv)
 		if (intel_guc_select_fw(&dev_priv->guc))
 			i915.enable_guc_loading = 0;
 	}
+
+	/* Can't enable guc submission without guc loaded */
+	if (!i915.enable_guc_loading)
+		i915.enable_guc_submission = 0;
+
+	/* A negative value means "use platform default" */
+	if (i915.enable_guc_submission < 0)
+		i915.enable_guc_submission = HAS_GUC_SCHED(dev_priv);
 }
 
 void intel_uc_init_early(struct drm_i915_private *dev_priv)