drm/i915/sdvo: Use named initializers for the SDVO command names

Use named initializers to make it easier to associate the SDVO debug
prints with the SDVO command defines. Also switch to using ARRAY_SIZE()
instead of assuming that SDVO_CMD_STATUS_SCALING_NOT_SUPP is the last
command type.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190619180312.31817-2-ville.syrjala@linux.intel.comReviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/display/intel_sdvo.c

@@ -429,13 +429,13 @@ static void intel_sdvo_debug_write(struct intel_sdvo *intel_sdvo, u8 cmd,
 }
 
 static const char * const cmd_status_names[] = {
-	"Power on",
-	"Success",
-	"Not supported",
-	"Invalid arg",
-	"Pending",
-	"Target not specified",
-	"Scaling not supported"
+	[SDVO_CMD_STATUS_POWER_ON] = "Power on",
+	[SDVO_CMD_STATUS_SUCCESS] = "Success",
+	[SDVO_CMD_STATUS_NOTSUPP] = "Not supported",
+	[SDVO_CMD_STATUS_INVALID_ARG] = "Invalid arg",
+	[SDVO_CMD_STATUS_PENDING] = "Pending",
+	[SDVO_CMD_STATUS_TARGET_NOT_SPECIFIED] = "Target not specified",
+	[SDVO_CMD_STATUS_SCALING_NOT_SUPP] = "Scaling not supported",
 };
 
 static bool __intel_sdvo_write_cmd(struct intel_sdvo *intel_sdvo, u8 cmd,
@@ -562,7 +562,7 @@ static bool intel_sdvo_read_response(struct intel_sdvo *intel_sdvo,
 #define BUF_PRINT(args...) \
 	pos += snprintf(buffer + pos, max_t(int, BUF_LEN - pos, 0), args)
 
-	if (status <= SDVO_CMD_STATUS_SCALING_NOT_SUPP)
+	if (status < ARRAY_SIZE(cmd_status_names))
 		BUF_PRINT("(%s)", cmd_status_names[status]);
 	else
 		BUF_PRINT("(??? %d)", status);