diff options
Diffstat (limited to 'drivers/gpu/drm/drm_blend.c')
-rw-r--r-- | drivers/gpu/drm/drm_blend.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c index 6e74de833466..fce734cdb85b 100644 --- a/drivers/gpu/drm/drm_blend.c +++ b/drivers/gpu/drm/drm_blend.c @@ -185,6 +185,25 @@ * plane does not expose the "alpha" property, then this is * assumed to be 1.0 * + * pixel_source: + * pixel_source is set up with drm_plane_create_pixel_source_property(). + * It is used to toggle the active source of pixel data for the plane. + * The plane will only display data from the set pixel_source -- any + * data from other sources will be ignored. + * + * For non-framebuffer sources, if pixel_source is set to a non-framebuffer + * and non-NONE source, and the corresponding source property is NULL, then + * the atomic commit should return an error. + * + * Possible values: + * + * "NONE": + * No active pixel source. + * Committing with a NONE pixel source will disable the plane. + * + * "FB": + * Framebuffer source set by the "FB_ID" property. + * * 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). @@ -615,3 +634,78 @@ int drm_plane_create_blend_mode_property(struct drm_plane *plane, return 0; } EXPORT_SYMBOL(drm_plane_create_blend_mode_property); + +static const struct drm_prop_enum_list drm_pixel_source_enum_list[] = { + { DRM_PLANE_PIXEL_SOURCE_NONE, "NONE" }, + { DRM_PLANE_PIXEL_SOURCE_FB, "FB" }, +}; + +/** + * drm_plane_create_pixel_source_property - create a new pixel source property + * @plane: DRM plane + * @extra_sources: Bitmask of additional supported pixel_sources for the driver. + * DRM_PLANE_PIXEL_SOURCE_FB and DRM_PLANE_PIXEL_SOURCE_NONE will + * always be enabled as supported sources. + * + * This creates a new property describing the current source of pixel data for the + * plane. The pixel_source will be initialized as DRM_PLANE_PIXEL_SOURCE_FB by default. + * + * Drivers can set a custom default source by overriding the pixel_source value in + * drm_plane_funcs.reset() + * + * The property is exposed to userspace as an enumeration property called + * "pixel_source" and has the following enumeration values: + * + * "NONE": + * No active pixel source + * + * "FB": + * Framebuffer pixel source + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_plane_create_pixel_source_property(struct drm_plane *plane, + unsigned long extra_sources) +{ + struct drm_device *dev = plane->dev; + struct drm_property *prop; + static const unsigned int valid_source_mask = BIT(DRM_PLANE_PIXEL_SOURCE_FB) | + BIT(DRM_PLANE_PIXEL_SOURCE_NONE); + int i; + + /* FB is supported by default */ + unsigned long supported_sources = extra_sources | + BIT(DRM_PLANE_PIXEL_SOURCE_FB) | + BIT(DRM_PLANE_PIXEL_SOURCE_NONE); + + if (WARN_ON(supported_sources & ~valid_source_mask)) + return -EINVAL; + + prop = drm_property_create(dev, DRM_MODE_PROP_ENUM | DRM_MODE_PROP_ATOMIC, "pixel_source", + hweight32(supported_sources)); + + if (!prop) + return -ENOMEM; + + for (i = 0; i < ARRAY_SIZE(drm_pixel_source_enum_list); i++) { + int ret; + + if (!test_bit(drm_pixel_source_enum_list[i].type, &supported_sources)) + continue; + + ret = drm_property_add_enum(prop, drm_pixel_source_enum_list[i].type, + drm_pixel_source_enum_list[i].name); + if (ret) { + drm_property_destroy(dev, prop); + + return ret; + } + } + + drm_object_attach_property(&plane->base, prop, DRM_PLANE_PIXEL_SOURCE_FB); + plane->pixel_source_property = prop; + + return 0; +} +EXPORT_SYMBOL(drm_plane_create_pixel_source_property); |