drm/atomic: Include color encoding/range in plane state dump

Include color_enconding and color_range in the plane state dump.

v2: Add kerneldoc (danvet)

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Daniel Stone <daniel@fooishbar.org>
Cc: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180219202846.10628-1-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Harry Wentland <harry.wentland@amd.com>

drivers/gpu/drm/drm_atomic.c

@@ -954,6 +954,10 @@ static void drm_atomic_plane_print_state(struct drm_printer *p,
 	drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
 	drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
 	drm_printf(p, "\trotation=%x\n", state->rotation);
+	drm_printf(p, "\tcolor-encoding=%s\n",
+		   drm_get_color_encoding_name(state->color_encoding));
+	drm_printf(p, "\tcolor-range=%s\n",
+		   drm_get_color_range_name(state->color_range));
 
 	if (plane->funcs->atomic_print_state)
 		plane->funcs->atomic_print_state(p, state);

drivers/gpu/drm/drm_color_mgmt.c

@@ -365,6 +365,36 @@ static const char * const color_range_name[] = {
 	[DRM_COLOR_YCBCR_LIMITED_RANGE] = "YCbCr limited range",
 };
 
+/**
+ * drm_get_color_encoding_name - return a string for color encoding
+ * @encoding: color encoding to compute name of
+ *
+ * In contrast to the other drm_get_*_name functions this one here returns a
+ * const pointer and hence is threadsafe.
+ */
+const char *drm_get_color_encoding_name(enum drm_color_encoding encoding)
+{
+	if (WARN_ON(encoding >= ARRAY_SIZE(color_encoding_name)))
+		return "unknown";
+
+	return color_encoding_name[encoding];
+}
+
+/**
+ * drm_get_color_range_name - return a string for color range
+ * @range: color range to compute name of
+ *
+ * In contrast to the other drm_get_*_name functions this one here returns a
+ * const pointer and hence is threadsafe.
+ */
+const char *drm_get_color_range_name(enum drm_color_range range)
+{
+	if (WARN_ON(range >= ARRAY_SIZE(color_range_name)))
+		return "unknown";
+
+	return color_range_name[range];
+}
+
 /**
  * drm_plane_create_color_properties - color encoding related plane properties
  * @plane: plane object

drivers/gpu/drm/drm_crtc_internal.h

@@ -71,6 +71,8 @@ int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
 				void *data, struct drm_file *file_priv);
 
 /* drm_color_mgmt.c */
+const char *drm_get_color_encoding_name(enum drm_color_encoding encoding);
+const char *drm_get_color_range_name(enum drm_color_range range);
 
 /* IOCTLs */
 int drm_mode_gamma_get_ioctl(struct drm_device *dev,