[PATCH RFC v6 02/10] drm: Introduce solid fill DRM plane property

Jessica Zhang
2023-08-29T00:07:22Z

Document and add support for solid_fill property to drm_plane. In
addition, add support for setting and getting the values for solid_fill.

To enable solid fill planes, userspace must assign a property blob to
the "solid_fill" plane property containing the following information:

struct drm_mode_solid_fill {
u32 r, g, b;
};

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
---
drivers/gpu/drm/drm_atomic_state_helper.c | 9 ++++++++
drivers/gpu/drm/drm_atomic_uapi.c | 26 ++++++++++++++++++++++
drivers/gpu/drm/drm_blend.c | 30 ++++++++++++++++++++++++++
include/drm/drm_blend.h | 1 +
include/drm/drm_plane.h | 36 +++++++++++++++++++++++++++++++
include/uapi/drm/drm_mode.h | 24 +++++++++++++++++++++
6 files changed, 126 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index 01638c51ce0a..86fb876efbe6 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -254,6 +254,11 @@ void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
plane_state->pixel_source = DRM_PLANE_PIXEL_SOURCE_FB;

+ if (plane_state->solid_fill_blob) {
+ drm_property_blob_put(plane_state->solid_fill_blob);
+ plane_state->solid_fill_blob = NULL;
+ }
+
if (plane->color_encoding_property) {
if (!drm_object_property_get_default_value(&plane->base,
plane->color_encoding_property,
@@ -336,6 +341,9 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
if (state->fb)
drm_framebuffer_get(state->fb);

+ if (state->solid_fill_blob)
+ drm_property_blob_get(state->solid_fill_blob);
+
state->fence = NULL;
state->commit = NULL;
state->fb_damage_clips = NULL;
@@ -385,6 +393,7 @@ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
drm_crtc_commit_put(state->commit);

drm_property_blob_put(state->fb_damage_clips);
+ drm_property_blob_put(state->solid_fill_blob);
}
EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 454f980e16c9..1cae596ab693 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -316,6 +316,20 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
}
EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);

+static void drm_atomic_set_solid_fill_prop(struct drm_plane_state *state)
+{
+ struct drm_mode_solid_fill *user_info;
+
+ if (!state->solid_fill_blob)
+ return;
+
+ user_info = (struct drm_mode_solid_fill *)state->solid_fill_blob->data;
+
+ state->solid_fill.r = user_info->r;
+ state->solid_fill.g = user_info->g;
+ state->solid_fill.b = user_info->b;
+}
+
static void set_out_fence_for_crtc(struct drm_atomic_state *state,
struct drm_crtc *crtc, s32 __user *fence_ptr)
{
@@ -546,6 +560,15 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
state->src_h = val;
} else if (property == plane->pixel_source_property) {
state->pixel_source = val;
+ } else if (property == plane->solid_fill_property) {
+ ret = drm_atomic_replace_property_blob_from_id(dev,
+ &state->solid_fill_blob,
+ val, sizeof(struct drm_mode_solid_fill),
+ -1, &replaced);
+ if (ret)
+ return ret;
+
+ drm_atomic_set_solid_fill_prop(state);
} else if (property == plane->alpha_property) {
state->alpha = val;
} else if (property == plane->blend_mode_property) {
@@ -620,6 +643,9 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
*val = state->src_h;
} else if (property == plane->pixel_source_property) {
*val = state->pixel_source;
+ } else if (property == plane->solid_fill_property) {
+ *val = state->solid_fill_blob ?
+ state->solid_fill_blob->base.id : 0;
} else if (property == plane->alpha_property) {
*val = state->alpha;
} else if (property == plane->blend_mode_property) {
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
index c3c57bae06b7..273021cc21c8 100644
--- a/drivers/gpu/drm/drm_blend.c
+++ b/drivers/gpu/drm/drm_blend.c
@@ -200,6 +200,10 @@
* "FB":
* Framebuffer source set by the "FB_ID" property.
*
+ * solid_fill:
+ * solid_fill is set up with drm_plane_create_solid_fill_property(). It
+ * contains pixel data that drivers can use to fill a plane.
+ *
* Note that all the property extensions described here apply either to the
* plane or the CRTC (e.g. for the background color, which currently is not
* exposed and assumed to be black).
@@ -705,3 +709,29 @@ int drm_plane_create_pixel_source_property(struct drm_plane *plane,
return 0;
}
EXPORT_SYMBOL(drm_plane_create_pixel_source_property);
+
+/**
+ * drm_plane_create_solid_fill_property - create a new solid_fill property
+ * @plane: drm plane
+ *
+ * This creates a new property blob that holds pixel data for solid fill planes.
+ * The property is exposed to userspace as a property blob called "solid_fill".
+ *
+ * For information on what the blob contains, see `drm_mode_solid_fill`.
+ */
+int drm_plane_create_solid_fill_property(struct drm_plane *plane)
+{
+ struct drm_property *prop;
+
+ prop = drm_property_create(plane->dev,
+ DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
+ "solid_fill", 0);
+ if (!prop)
+ return -ENOMEM;
+
+ drm_object_attach_property(&plane->base, prop, 0);
+ plane->solid_fill_property = prop;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_solid_fill_property);
diff --git a/include/drm/drm_blend.h b/include/drm/drm_blend.h
index 122bbfbaae33..e7158fbee389 100644
--- a/include/drm/drm_blend.h
+++ b/include/drm/drm_blend.h
@@ -60,4 +60,5 @@ int drm_plane_create_blend_mode_property(struct drm_plane *plane,
unsigned int supported_modes);
int drm_plane_create_pixel_source_property(struct drm_plane *plane,
unsigned long extra_sources);
+int drm_plane_create_solid_fill_property(struct drm_plane *plane);
#endif
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 89508b4dea4a..a38e18bfb43e 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -46,6 +46,18 @@ enum drm_plane_pixel_source {
DRM_PLANE_PIXEL_SOURCE_MAX
};

+/**
+ * struct solid_fill_property - RGB values for solid fill plane
+ *
+ * TODO: Add solid fill source and corresponding pixel source
+ * that supports RGBA color
+ */
+struct drm_solid_fill {
+ uint32_t r;
+ uint32_t g;
+ uint32_t b;
+};
+
/**
* struct drm_plane_state - mutable plane state
*
@@ -130,6 +142,23 @@ struct drm_plane_state {
*/
enum drm_plane_pixel_source pixel_source;

+ /**
+ * @solid_fill_blob:
+ *
+ * Blob containing relevant information for a solid fill plane
+ * including pixel format and data. See
+ * drm_plane_create_solid_fill_property() for more details.
+ */
+ struct drm_property_blob *solid_fill_blob;
+
+ /**
+ * @solid_fill:
+ *
+ * Pixel data for solid fill planes. See
+ * drm_plane_create_solid_fill_property() for more details.
+ */
+ struct drm_solid_fill solid_fill;
+
/**
* @alpha:
* Opacity of the plane with 0 as completely transparent and 0xffff as
@@ -720,6 +749,13 @@ struct drm_plane {
*/
struct drm_property *pixel_source_property;

+ /**
+ * @solid_fill_property:
+ * Optional solid_fill property for this plane. See
+ * drm_plane_create_solid_fill_property().
+ */
+ struct drm_property *solid_fill_property;
+
/**
* @alpha_property:
* Optional alpha property for this plane. See
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 43691058d28f..1fd92886d66c 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -259,6 +259,30 @@ struct drm_mode_modeinfo {
char name[DRM_DISPLAY_MODE_LEN];
};

+/**
+ * struct drm_mode_solid_fill - User info for solid fill planes
+ *
+ * This is the userspace API solid fill information structure.
+ *
+ * Userspace can enable solid fill planes by assigning the plane "solid_fill"
+ * property to a blob containing a single drm_mode_solid_fill struct populated with an RGB323232
+ * color and setting the pixel source to "SOLID_FILL".
+ *
+ * For information on the plane property, see drm_plane_create_solid_fill_property()
+ *
+ * @r: Red color value of single pixel
+ * @g: Green color value of single pixel
+ * @b: Blue color value of single pixel
+ * @pad: padding
+ */
+struct drm_mode_solid_fill {
+ __u32 r;
+ __u32 g;
+ __u32 b;
+ __u32 pad;
+};
+
+
struct drm_mode_card_res {
__u64 fb_id_ptr;
__u64 crtc_id_ptr;

--
2.42.0