drm/i915/uc: Don't fetch HuC fw if GuC fw fetch already failed

When we failed to fetch GuC firmware there is no point in fetching
HuC firmware as we will not be able to use it without working GuC.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190807170034.8440-4-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/gt/uc/intel_uc.c

@@ -283,11 +283,14 @@ static void guc_disable_communication(struct intel_guc *guc)
 void intel_uc_fetch_firmwares(struct intel_uc *uc)
 {
 	struct drm_i915_private *i915 = uc_to_gt(uc)->i915;
+	int err;
 
 	if (!intel_uc_supports_guc(uc))
 		return;
 
-	intel_uc_fw_fetch(&uc->guc.fw, i915);
+	err = intel_uc_fw_fetch(&uc->guc.fw, i915);
+	if (err)
+		return;
 
 	if (intel_uc_supports_huc(uc))
 		intel_uc_fw_fetch(&uc->huc.fw, i915);

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c

@@ -205,13 +205,14 @@ void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
 
 /**
  * intel_uc_fw_fetch - fetch uC firmware
- *
  * @uc_fw: uC firmware
  * @i915: device private
  *
  * Fetch uC firmware into GEM obj.
+ *
+ * Return: 0 on success, a negative errno code on failure.
  */
-void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
+int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 {
 	struct drm_i915_gem_object *obj;
 	const struct firmware *fw = NULL;
@@ -322,7 +323,7 @@ void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 	uc_fw->status = INTEL_UC_FIRMWARE_AVAILABLE;
 
 	release_firmware(fw);
-	return;
+	return 0;
 
 fail:
 	uc_fw->status = INTEL_UC_FIRMWARE_MISSING;
@@ -333,6 +334,7 @@ void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915)
 		 intel_uc_fw_type_repr(uc_fw->type), INTEL_UC_FIRMWARE_URL);
 
 	release_firmware(fw);		/* OK even if fw is NULL */
+	return err;
 }
 
 static u32 uc_fw_ggtt_offset(struct intel_uc_fw *uc_fw, struct i915_ggtt *ggtt)

drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h

@@ -173,8 +173,7 @@ static inline u32 intel_uc_fw_get_upload_size(struct intel_uc_fw *uc_fw)
 void intel_uc_fw_init_early(struct intel_uc_fw *uc_fw,
 			    enum intel_uc_fw_type type, bool supported,
 			    enum intel_platform platform, u8 rev);
-void intel_uc_fw_fetch(struct intel_uc_fw *uc_fw,
-		       struct drm_i915_private *i915);
+int intel_uc_fw_fetch(struct intel_uc_fw *uc_fw, struct drm_i915_private *i915);
 void intel_uc_fw_cleanup_fetch(struct intel_uc_fw *uc_fw);
 int intel_uc_fw_upload(struct intel_uc_fw *uc_fw, struct intel_gt *gt,
 		       u32 wopcm_offset, u32 dma_flags);