drm/komeda: remove img_enhancement property

Properties are uapi like anything else, with all the usual rules
regarding review, testcases, open source userspace ... Furthermore
driver-private kms properties are highly discouraged, over the past
few years we've realized we need to make a serious effort at better
standardizing this stuff.

Again this probably needs multiple pieces to solve this properly:

- Instead of expecting userspace to compute this (and duplicating
  modeset code), the kernel driver should compute when it's possible
  to enable this better up/downscale mode (assuming I understood
  Liviu correctly on what this does) automatically.

- If this is needed for validation then you want a debugfs file to
  force this one way or the other, or alternatively  use
  ->atomic_print_state to dump such hidden driver-private state.
  Depends upon how you do your validation ofc.

Fixes: 42b6f118 ("drm/komeda: Add image enhancement support")
Cc: Lowry Li (Arm Technology China) <lowry.li@arm.com>
Cc: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mali DP Maintainers <malidp@foss.arm.com>
Cc: Brian Starkey <brian.starkey@arm.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190705121006.26085-3-daniel.vetter@ffwll.ch

drivers/gpu/drm/arm/display/komeda/komeda_kms.h

@@ -34,8 +34,6 @@ struct komeda_plane {
 	 */
 	struct komeda_layer *layer;
 
-	/** @prop_img_enhancement: for on/off image enhancement */
-	struct drm_property *prop_img_enhancement;
 	/** @prop_layer_split: for on/off layer_split */
 	struct drm_property *prop_layer_split;
 };

drivers/gpu/drm/arm/display/komeda/komeda_plane.c

@@ -197,9 +197,7 @@ komeda_plane_atomic_get_property(struct drm_plane *plane,
 	struct komeda_plane *kplane = to_kplane(plane);
 	struct komeda_plane_state *st = to_kplane_st(state);
 
-	if (property == kplane->prop_img_enhancement)
-		*val = st->img_enhancement;
-	else if (property == kplane->prop_layer_split)
+	if (property == kplane->prop_layer_split)
 		*val = st->layer_split;
 	else
 		return -EINVAL;
@@ -216,9 +214,7 @@ komeda_plane_atomic_set_property(struct drm_plane *plane,
 	struct komeda_plane *kplane = to_kplane(plane);
 	struct komeda_plane_state *st = to_kplane_st(state);
 
-	if (property == kplane->prop_img_enhancement)
-		st->img_enhancement = !!val;
-	else if (property == kplane->prop_layer_split)
+	if (property == kplane->prop_layer_split)
 		st->layer_split = !!val;
 	else
 		return -EINVAL;
@@ -258,17 +254,6 @@ komeda_plane_create_layer_properties(struct komeda_plane *kplane,
 	struct drm_plane *plane = &kplane->base;
 	struct drm_property *prop = NULL;
 
-	/* property: layer image_enhancement */
-	if (layer->base.supported_outputs & KOMEDA_PIPELINE_SCALERS) {
-		prop = drm_property_create_bool(drm, DRM_MODE_PROP_ATOMIC,
-						"img_enhancement");
-		if (!prop)
-			return -ENOMEM;
-
-		drm_object_attach_property(&plane->base, prop, 0);
-		kplane->prop_img_enhancement = prop;
-	}
-
 	/* property: layer split */
 	if (layer->right) {
 		prop = drm_property_create_bool(drm, DRM_MODE_PROP_ATOMIC,