drm/komeda: Add image enhancement support

Besides scaling, Arm display scaler also can support image enhancement.
For support it, Add a new property "img_enhancement" to plane, then user
can turn on/off it by this property, and kernel follow user's requirement
to maitain the state and enable/disable the real HW image enhancement.

v2: Rebase and rename "needs_img_enhancement" to "en_img_enhancement"

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/display/komeda/d71/d71_component.c

@@ -610,6 +610,7 @@ static void d71_scaler_update(struct komeda_component *c,
 	ctrl = 0;
 	ctrl |= st->en_scaling ? SC_CTRL_SCL : 0;
 	ctrl |= st->en_alpha ? SC_CTRL_AP : 0;
+	ctrl |= st->en_img_enhancement ? SC_CTRL_IENH : 0;
 
 	malidp_write32(reg, BLK_CONTROL, ctrl);
 	malidp_write32(reg, BLK_INPUT_ID0, to_d71_input_id(&state->inputs[0]));

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

@@ -32,6 +32,9 @@ struct komeda_plane {
 	 * Layers with same capabilities.
 	 */
 	struct komeda_layer *layer;
+
+	/** @prop_img_enhancement: for on/off image enhancement */
+	struct drm_property *prop_img_enhancement;
 };
 
 /**
@@ -44,7 +47,8 @@ struct komeda_plane_state {
 	/** @base: &drm_plane_state */
 	struct drm_plane_state base;
 
-	/* private properties */
+	/* @img_enhancement: on/off image enhancement */
+	u8 img_enhancement : 1;
 };
 
 /**

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

@@ -254,7 +254,8 @@ struct komeda_scaler_state {
 	u16 hsize_in, vsize_in;
 	u16 hsize_out, vsize_out;
 	u8 en_scaling : 1,
-	   en_alpha : 1; /* enable alpha processing */
+	   en_alpha : 1, /* enable alpha processing */
+	   en_img_enhancement : 1;
 };
 
 struct komeda_compiz {
@@ -313,7 +314,8 @@ struct komeda_data_flow_cfg {
 	u32 rot;
 	int blending_zorder;
 	u8 pixel_blend_mode, layer_alpha;
-	u8 en_scaling : 1;
+	u8 en_scaling : 1,
+	   en_img_enhancement : 1;
 };
 
 struct komeda_pipeline_funcs {

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

@@ -457,7 +457,7 @@ komeda_scaler_validate(void *user,
 	struct komeda_scaler *scaler;
 	int err = 0;
 
-	if (!dflow->en_scaling)
+	if (!(dflow->en_scaling || dflow->en_img_enhancement))
 		return 0;
 
 	scaler = komeda_component_get_avail_scaler(dflow->input.component,
@@ -482,9 +482,11 @@ komeda_scaler_validate(void *user,
 	st->vsize_in = dflow->in_h;
 	st->hsize_out = dflow->out_w;
 	st->vsize_out = dflow->out_h;
-	st->en_scaling = dflow->en_scaling;
+
 	/* Enable alpha processing if the next stage needs the pixel alpha */
 	st->en_alpha = dflow->pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE;
+	st->en_scaling = dflow->en_scaling;
+	st->en_img_enhancement = dflow->en_img_enhancement;
 
 	komeda_component_add_input(&st->base, &dflow->input, 0);
 	komeda_component_set_output(&dflow->input, &scaler->base, 0);

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

@@ -15,6 +15,7 @@ static int
 komeda_plane_init_data_flow(struct drm_plane_state *st,
 			    struct komeda_data_flow_cfg *dflow)
 {
+	struct komeda_plane_state *kplane_st = to_kplane_st(st);
 	struct drm_framebuffer *fb = st->fb;
 
 	memset(dflow, 0, sizeof(*dflow));
@@ -23,7 +24,7 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
 
 	/* if format doesn't have alpha, fix blend mode to PIXEL_NONE */
 	dflow->pixel_blend_mode = fb->format->has_alpha ?
-		st->pixel_blend_mode : DRM_MODE_BLEND_PIXEL_NONE;
+			st->pixel_blend_mode : DRM_MODE_BLEND_PIXEL_NONE;
 	dflow->layer_alpha = st->alpha >> 8;
 
 	dflow->out_x = st->crtc_x;
@@ -36,6 +37,8 @@ komeda_plane_init_data_flow(struct drm_plane_state *st,
 	dflow->in_w = st->src_w >> 16;
 	dflow->in_h = st->src_h >> 16;
 
+	dflow->en_img_enhancement = kplane_st->img_enhancement;
+
 	komeda_complete_data_flow_cfg(dflow);
 
 	return 0;
@@ -131,7 +134,7 @@ static void komeda_plane_reset(struct drm_plane *plane)
 static struct drm_plane_state *
 komeda_plane_atomic_duplicate_state(struct drm_plane *plane)
 {
-	struct komeda_plane_state *new;
+	struct komeda_plane_state *new, *old;
 
 	if (WARN_ON(!plane->state))
 		return NULL;
@@ -142,6 +145,10 @@ komeda_plane_atomic_duplicate_state(struct drm_plane *plane)
 
 	__drm_atomic_helper_plane_duplicate_state(plane, &new->base);
 
+	old = to_kplane_st(plane->state);
+
+	new->img_enhancement = old->img_enhancement;
+
 	return &new->base;
 }
 
@@ -153,6 +160,40 @@ komeda_plane_atomic_destroy_state(struct drm_plane *plane,
 	kfree(to_kplane_st(state));
 }
 
+static int
+komeda_plane_atomic_get_property(struct drm_plane *plane,
+				 const struct drm_plane_state *state,
+				 struct drm_property *property,
+				 uint64_t *val)
+{
+	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
+		return -EINVAL;
+
+	return 0;
+}
+
+static int
+komeda_plane_atomic_set_property(struct drm_plane *plane,
+				 struct drm_plane_state *state,
+				 struct drm_property *property,
+				 uint64_t val)
+{
+	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
+		return -EINVAL;
+
+	return 0;
+}
+
 static bool
 komeda_plane_format_mod_supported(struct drm_plane *plane,
 				  u32 format, u64 modifier)
@@ -172,9 +213,33 @@ static const struct drm_plane_funcs komeda_plane_funcs = {
 	.reset			= komeda_plane_reset,
 	.atomic_duplicate_state	= komeda_plane_atomic_duplicate_state,
 	.atomic_destroy_state	= komeda_plane_atomic_destroy_state,
+	.atomic_get_property	= komeda_plane_atomic_get_property,
+	.atomic_set_property	= komeda_plane_atomic_set_property,
 	.format_mod_supported	= komeda_plane_format_mod_supported,
 };
 
+static int
+komeda_plane_create_layer_properties(struct komeda_plane *kplane,
+				     struct komeda_layer *layer)
+{
+	struct drm_device *drm = kplane->base.dev;
+	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;
+	}
+
+	return 0;
+}
+
 /* for komeda, which is pipeline can be share between crtcs */
 static u32 get_possible_crtcs(struct komeda_kms_dev *kms,
 			      struct komeda_pipeline *pipe)
@@ -236,6 +301,10 @@ static int komeda_plane_add(struct komeda_kms_dev *kms,
 
 	drm_plane_helper_add(plane, &komeda_plane_helper_funcs);
 
+	err = komeda_plane_create_layer_properties(kplane, layer);
+	if (err)
+		goto cleanup;
+
 	return 0;
 cleanup:
 	komeda_plane_destroy(plane);