drm: clarify scaling property names

Now that we're using the scaling property in the Intel driver I noticed
that the names were a bit confusing.  I've corrected them according to
our discussion on IRC and the mailing list, though I've left out
potential new additions for a new scaling property with an integer (or
two) for the scaling factor.  None of the drivers implement that today,
but if someone wants to do it, I think it could be done with the
addition of a single new type and a new property to describe the
scaling factor in the X and Y directions.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc.c

@@ -68,10 +68,10 @@ DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
  */
 static struct drm_prop_enum_list drm_scaling_mode_enum_list[] =
 {
-	{ DRM_MODE_SCALE_NON_GPU, "Non-GPU" },
-	{ DRM_MODE_SCALE_FULLSCREEN, "Fullscreen" },
-	{ DRM_MODE_SCALE_NO_SCALE, "No scale" },
-	{ DRM_MODE_SCALE_ASPECT, "Aspect" },
+	{ DRM_MODE_SCALE_NONE, "None" },
+	{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
+	{ DRM_MODE_SCALE_CENTER, "Center" },
+	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
 };
 
 static struct drm_prop_enum_list drm_dithering_mode_enum_list[] =

drivers/gpu/drm/i915/intel_lvds.c

@@ -38,14 +38,6 @@
 #include "i915_drv.h"
 #include <linux/acpi.h>
 
-/*
- * the following four scaling options are defined.
- * #define DRM_MODE_SCALE_NON_GPU	0
- * #define DRM_MODE_SCALE_FULLSCREEN	1
- * #define DRM_MODE_SCALE_NO_SCALE	2
- * #define DRM_MODE_SCALE_ASPECT	3
- */
-
 /* Private structure for the integrated LVDS support */
 struct intel_lvds_priv {
 	int fitting_mode;
@@ -334,7 +326,7 @@ static bool intel_lvds_mode_fixup(struct drm_encoder *encoder,
 	I915_WRITE(BCLRPAT_B, 0);
 
 	switch (lvds_priv->fitting_mode) {
-	case DRM_MODE_SCALE_NO_SCALE:
+	case DRM_MODE_SCALE_CENTER:
 		/*
 		 * For centered modes, we have to calculate border widths &
 		 * heights and modify the values programmed into the CRTC.
@@ -670,8 +662,8 @@ static int intel_lvds_set_property(struct drm_connector *connector,
 				connector->encoder) {
 		struct drm_crtc *crtc = connector->encoder->crtc;
 		struct intel_lvds_priv *lvds_priv = intel_output->dev_priv;
-		if (value == DRM_MODE_SCALE_NON_GPU) {
-			DRM_DEBUG_KMS("non_GPU property is unsupported\n");
+		if (value == DRM_MODE_SCALE_NONE) {
+			DRM_DEBUG_KMS("no scaling not supported\n");
 			return 0;
 		}
 		if (lvds_priv->fitting_mode == value) {

include/drm/drm_mode.h

@@ -68,10 +68,11 @@
 #define DRM_MODE_DPMS_OFF	3
 
 /* Scaling mode options */
-#define DRM_MODE_SCALE_NON_GPU		0
-#define DRM_MODE_SCALE_FULLSCREEN	1
-#define DRM_MODE_SCALE_NO_SCALE		2
-#define DRM_MODE_SCALE_ASPECT		3
+#define DRM_MODE_SCALE_NONE		0 /* Unmodified timing (display or
+					     software can still scale) */
+#define DRM_MODE_SCALE_FULLSCREEN	1 /* Full screen, ignore aspect */
+#define DRM_MODE_SCALE_CENTER		2 /* Centered, no scaling */
+#define DRM_MODE_SCALE_ASPECT		3 /* Full screen, preserve aspect */
 
 /* Dithering mode options */
 #define DRM_MODE_DITHERING_OFF	0