drm/i915/uc: Reorder firmware status codes

On Gen9 when we try to reload HuC due to GuC upload error, we hit:

<7> [232.025927] [drm:intel_uc_init_hw [i915]] GuC fw load failed: -8; will reset and retry 2 more time(s)
<7> [232.026004] [drm:intel_uc_fw_upload [i915]] HuC fw load i915/kbl_huc_ver02_00_1810.bin
<7> [232.026686] [drm:intel_uc_fw_upload [i915]] HuC fw xfer completed
<6> [232.026688] [drm] HuC: Loaded firmware i915/kbl_huc_ver02_00_1810.bin (version 2.0)
<3> [232.026703] intel_uc_fw_copy_rsa:541 GEM_BUG_ON(!intel_uc_fw_is_available(uc_fw))

as firmware that previously failed to load was wrongly treated as
unavailable since its status code was not matching status check logic.
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/20190802184055.31988-4-michal.wajdeczko@intel.com

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

@@ -37,12 +37,12 @@ struct intel_gt;
 #define INTEL_UC_FIRMWARE_URL "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915"
 
 enum intel_uc_fw_status {
-	INTEL_UC_FIRMWARE_FAIL = -3, /* failed to xfer or init/auth the fw */
-	INTEL_UC_FIRMWARE_MISSING = -2, /* blob not found on the system */
-	INTEL_UC_FIRMWARE_NOT_SUPPORTED = -1, /* no uc HW */
+	INTEL_UC_FIRMWARE_NOT_SUPPORTED = -1, /* no uc HW or disabled */
 	INTEL_UC_FIRMWARE_UNINITIALIZED = 0, /* used to catch checks done too early */
 	INTEL_UC_FIRMWARE_SELECTED, /* selected the blob we want to load */
+	INTEL_UC_FIRMWARE_MISSING, /* blob not found on the system */
 	INTEL_UC_FIRMWARE_AVAILABLE, /* blob found and copied in mem */
+	INTEL_UC_FIRMWARE_FAIL, /* failed to xfer or init/auth the fw */
 	INTEL_UC_FIRMWARE_TRANSFERRED, /* dma xfer done */
 	INTEL_UC_FIRMWARE_RUNNING /* init/auth done */
 };
@@ -83,18 +83,18 @@ static inline
 const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
 {
 	switch (status) {
-	case INTEL_UC_FIRMWARE_FAIL:
-		return "FAIL";
-	case INTEL_UC_FIRMWARE_MISSING:
-		return "MISSING";
 	case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
 		return "N/A";
 	case INTEL_UC_FIRMWARE_UNINITIALIZED:
 		return "UNINITIALIZED";
 	case INTEL_UC_FIRMWARE_SELECTED:
 		return "SELECTED";
+	case INTEL_UC_FIRMWARE_MISSING:
+		return "MISSING";
 	case INTEL_UC_FIRMWARE_AVAILABLE:
 		return "AVAILABLE";
+	case INTEL_UC_FIRMWARE_FAIL:
+		return "FAIL";
 	case INTEL_UC_FIRMWARE_TRANSFERRED:
 		return "TRANSFERRED";
 	case INTEL_UC_FIRMWARE_RUNNING: