drm/i915/uc: Never fail on uC preparation step

Let's wait with decision about importance of uC failure to
hardware initialization step.
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/20190817131144.26884-4-michal.wajdeczko@intel.com

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

@@ -310,6 +310,9 @@ void intel_guc_fini(struct intel_guc *guc)
 {
 	struct intel_gt *gt = guc_to_gt(guc);
 
+	if (!intel_uc_fw_is_available(&guc->fw))
+		return;
+
 	i915_ggtt_disable_guc(gt->ggtt);
 
 	if (intel_guc_is_submission_supported(guc))

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

@@ -105,6 +105,9 @@ int intel_huc_init(struct intel_huc *huc)
 
 void intel_huc_fini(struct intel_huc *huc)
 {
+	if (!intel_uc_fw_is_available(&huc->fw))
+		return;
+
 	intel_huc_rsa_data_destroy(huc);
 	intel_uc_fw_fini(&huc->fw);
 }

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

@@ -288,27 +288,26 @@ void intel_uc_cleanup_firmwares(struct intel_uc *uc)
 	intel_uc_fw_cleanup_fetch(&uc->guc.fw);
 }
 
-int intel_uc_init(struct intel_uc *uc)
+void intel_uc_init(struct intel_uc *uc)
 {
 	struct intel_guc *guc = &uc->guc;
 	struct intel_huc *huc = &uc->huc;
 	int ret;
 
 	if (!intel_uc_uses_guc(uc))
-		return 0;
+		return;
 
 	/* XXX: GuC submission is unavailable for now */
 	GEM_BUG_ON(intel_uc_supports_guc_submission(uc));
 
 	ret = intel_guc_init(guc);
-	if (ret)
-		return ret;
-
-	if (intel_uc_uses_huc(uc)) {
-		intel_huc_init(huc);
+	if (ret) {
+		intel_uc_fw_cleanup_fetch(&huc->fw);
+		return;
 	}
 
-	return 0;
+	if (intel_uc_uses_huc(uc))
+		intel_huc_init(huc);
 }
 
 void intel_uc_fini(struct intel_uc *uc)

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

@@ -24,9 +24,9 @@ void intel_uc_init_mmio(struct intel_uc *uc);
 void intel_uc_fetch_firmwares(struct intel_uc *uc);
 void intel_uc_cleanup_firmwares(struct intel_uc *uc);
 void intel_uc_sanitize(struct intel_uc *uc);
+void intel_uc_init(struct intel_uc *uc);
 int intel_uc_init_hw(struct intel_uc *uc);
 void intel_uc_fini_hw(struct intel_uc *uc);
-int intel_uc_init(struct intel_uc *uc);
 void intel_uc_fini(struct intel_uc *uc);
 void intel_uc_reset_prepare(struct intel_uc *uc);
 void intel_uc_suspend(struct intel_uc *uc);

drivers/gpu/drm/i915/i915_gem.c

@@ -1464,11 +1464,7 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
 
 	intel_init_gt_powersave(dev_priv);
 
-	ret = intel_uc_init(&dev_priv->gt.uc);
-	if (ret) {
-		GEM_BUG_ON(ret == -EIO);
-		goto err_pm;
-	}
+	intel_uc_init(&dev_priv->gt.uc);
 
 	ret = i915_gem_init_hw(dev_priv);
 	if (ret)
@@ -1530,10 +1526,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
 err_init_hw:
 	intel_uc_fini_hw(&dev_priv->gt.uc);
 err_uc_init:
-	if (ret != -EIO)
-		intel_uc_fini(&dev_priv->gt.uc);
-err_pm:
 	if (ret != -EIO) {
+		intel_uc_fini(&dev_priv->gt.uc);
 		intel_cleanup_gt_powersave(dev_priv);
 		intel_engines_cleanup(dev_priv);
 	}