[Intel-gfx] [PATCH 5/5] drm/i915/guc: Simplify guc_fw_path

[Arkadiusz Hiler]

Currently guc_fw_path values can represent one of three possible states:

 1) NULL - device without GuC
 2) '\0' - device with GuC but no known firmware
 3) else - device with GuC and known firmware

Second case is used only to WARN at the later stage.

We can WARN right away and merge cases 1 and 2 for later handling.

Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Cc: Jeff McGee <jeff.mcgee at intel.com>
Cc: Michal Winiarski <michal.winiarski at intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
---
 drivers/gpu/drm/i915/intel_guc_loader.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 0bb5fd1..075a103 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -460,12 +460,8 @@ int intel_guc_load(struct drm_i915_private *dev_priv)
 		intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
 
 	if (fw_path == NULL) {
-		/* Device is known to have no uCode (e.g. no GuC) */
+		/* We do not have uCode for the device */
 		return -ENXIO;
-	} else if (*fw_path == '\0') {
-		/* Device has a GuC but we don't know what f/w to load? */
-		WARN(1, "No GuC firmware known for this platform!\n");
-		return -ENODEV;
 	}
 
 	/* Fetch failed, or already fetched but failed to load? */
@@ -628,11 +624,9 @@ static void guc_fw_fetch(struct drm_i915_private *dev_priv,
 void intel_guc_init(struct drm_i915_private *dev_priv)
 {
 	struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
-	const char *fw_path;
+	const char *fw_path = NULL;
 
-	if (!HAS_GUC_UCODE(dev_priv)) {
-		fw_path = NULL;
-	} else if (IS_SKYLAKE(dev_priv)) {
+	if (IS_SKYLAKE(dev_priv)) {
 		fw_path = I915_SKL_GUC_UCODE;
 		guc_fw->guc_fw_major_wanted = SKL_FW_MAJOR;
 		guc_fw->guc_fw_minor_wanted = SKL_FW_MINOR;
@@ -644,24 +638,22 @@ void intel_guc_init(struct drm_i915_private *dev_priv)
 		fw_path = I915_KBL_GUC_UCODE;
 		guc_fw->guc_fw_major_wanted = KBL_FW_MAJOR;
 		guc_fw->guc_fw_minor_wanted = KBL_FW_MINOR;
-	} else {
-		fw_path = "";	/* unknown device */
+	} else if (HAS_GUC_UCODE(dev_priv)) {
+		WARN(1, "No GuC firmware known for platform with GuC!\n");
 	}
 
 	guc_fw->guc_fw_path = fw_path;
 	guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_NONE;
 	guc_fw->guc_fw_load_status = GUC_FIRMWARE_NONE;
 
-	/* Early (and silent) return if GuC loading is disabled */
+	/* Early return if we do not have firmware to fetch */
 	if (fw_path == NULL)
 		return;
-	if (*fw_path == '\0')
-		return;
 
 	guc_fw->guc_fw_fetch_status = GUC_FIRMWARE_PENDING;
 	DRM_DEBUG_DRIVER("GuC firmware pending, path %s\n", fw_path);
+
 	guc_fw_fetch(dev_priv, guc_fw);
-	/* status must now be FAIL or SUCCESS */
 }
 
 /**
-- 
2.9.3