drm/i915/uc: Separate firmware selection and preparation

intel_{h,g}uc_init_fw selects correct firmware and then triggers it's
preparation (fetch + initial parsing).

This change separates out select steps, so those can be called by
the sanitize_options().

Then, during the init_fw(), we prepare the firmware if the firmware was
selected.

Cc: Michal Winiarski <michal.winiarski@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/intel_guc_loader.c

@@ -393,15 +393,12 @@ int intel_guc_init_hw(struct intel_guc *guc)
 }
 
 /**
- * intel_guc_init_fw() - select and prepare firmware for loading
+ * intel_guc_select_fw() - selects GuC firmware for loading
  * @guc:	intel_guc struct
  *
- * Called early during driver load, but after GEM is initialised.
- *
- * The firmware will be transferred to the GuC's memory later,
- * when intel_guc_init_hw() is called.
+ * Return: zero when we know firmware, non-zero in other case
  */
-void intel_guc_init_fw(struct intel_guc *guc)
+int intel_guc_select_fw(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 
@@ -424,11 +421,10 @@ void intel_guc_init_fw(struct intel_guc *guc)
 		guc->fw.minor_ver_wanted = KBL_FW_MINOR;
 	} else {
 		DRM_ERROR("No GuC firmware known for platform with GuC!\n");
-		i915.enable_guc_loading = 0;
-		return;
+		return -ENOENT;
 	}
 
-	intel_uc_prepare_fw(dev_priv, &guc->fw);
+	return 0;
 }
 
 /**

drivers/gpu/drm/i915/intel_huc.c

@@ -141,18 +141,10 @@ static int huc_ucode_xfer(struct drm_i915_private *dev_priv)
 }
 
 /**
- * intel_huc_init_fw() - select and prepare firmware for loading
+ * intel_huc_select_fw() - selects HuC firmware for loading
  * @huc:	intel_huc struct
- *
- * Called early during driver load, but after GEM is initialised. The loading
- * will continue only when driver explicitly specify firmware name and version.
- * All other cases are considered as INTEL_UC_FIRMWARE_NONE either because HW
- * is not capable or driver yet support it. And there will be no error message
- * for INTEL_UC_FIRMWARE_NONE cases.
- *
- * The DMA-copying to HW is done later when intel_huc_init_hw() is called.
  */
-void intel_huc_init_fw(struct intel_huc *huc)
+void intel_huc_select_fw(struct intel_huc *huc)
 {
 	struct drm_i915_private *dev_priv = huc_to_i915(huc);
 
@@ -177,8 +169,6 @@ void intel_huc_init_fw(struct intel_huc *huc)
 		DRM_ERROR("No HuC firmware known for platform with HuC!\n");
 		return;
 	}
-
-	intel_uc_prepare_fw(dev_priv, &huc->fw);
 }
 
 /**

drivers/gpu/drm/i915/intel_uc.c

@@ -66,6 +66,14 @@ void intel_uc_sanitize_options(struct drm_i915_private *dev_priv)
 		if (!i915.enable_guc_loading)
 			i915.enable_guc_submission = 0;
 	}
+
+	if (i915.enable_guc_loading) {
+		if (HAS_HUC_UCODE(dev_priv))
+			intel_huc_select_fw(&dev_priv->huc);
+
+		if (intel_guc_select_fw(&dev_priv->guc))
+			i915.enable_guc_loading = 0;
+	}
 }
 
 void intel_uc_init_early(struct drm_i915_private *dev_priv)
@@ -75,13 +83,11 @@ void intel_uc_init_early(struct drm_i915_private *dev_priv)
 
 void intel_uc_init_fw(struct drm_i915_private *dev_priv)
 {
-	if (!i915.enable_guc_loading)
-		return;
-
-	if (HAS_HUC_UCODE(dev_priv))
-		intel_huc_init_fw(&dev_priv->huc);
+	if (dev_priv->huc.fw.path)
+		intel_uc_prepare_fw(dev_priv, &dev_priv->huc.fw);
 
-	intel_guc_init_fw(&dev_priv->guc);
+	if (dev_priv->guc.fw.path)
+		intel_uc_prepare_fw(dev_priv, &dev_priv->guc.fw);
 }
 
 int intel_uc_init_hw(struct drm_i915_private *dev_priv)

drivers/gpu/drm/i915/intel_uc.h

@@ -194,7 +194,7 @@ int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len);
 int intel_guc_sample_forcewake(struct intel_guc *guc);
 
 /* intel_guc_loader.c */
-void intel_guc_init_fw(struct intel_guc *guc);
+int intel_guc_select_fw(struct intel_guc *guc);
 int intel_guc_init_hw(struct intel_guc *guc);
 void intel_guc_fini(struct drm_i915_private *dev_priv);
 const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status);
@@ -226,7 +226,7 @@ static inline u32 guc_ggtt_offset(struct i915_vma *vma)
 }
 
 /* intel_huc.c */
-void intel_huc_init_fw(struct intel_huc *huc);
+void intel_huc_select_fw(struct intel_huc *huc);
 void intel_huc_fini(struct drm_i915_private  *dev_priv);
 int intel_huc_init_hw(struct intel_huc *huc);
 void intel_guc_auth_huc(struct drm_i915_private *dev_priv);