int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state);
/* * Helpers for planes with shadow buffers
*/
/** * DRM_SHADOW_PLANE_MAX_WIDTH - Maximum width of a plane's shadow buffer in pixels * * For drivers with shadow planes, the maximum width of the framebuffer is * usually independent from hardware limitations. Drivers can initialize struct * drm_mode_config.max_width from DRM_SHADOW_PLANE_MAX_WIDTH.
*/ #define DRM_SHADOW_PLANE_MAX_WIDTH (4096u)
/** * DRM_SHADOW_PLANE_MAX_HEIGHT - Maximum height of a plane's shadow buffer in scanlines * * For drivers with shadow planes, the maximum height of the framebuffer is * usually independent from hardware limitations. Drivers can initialize struct * drm_mode_config.max_height from DRM_SHADOW_PLANE_MAX_HEIGHT.
*/ #define DRM_SHADOW_PLANE_MAX_HEIGHT (4096u)
/** * struct drm_shadow_plane_state - plane state for planes with shadow buffers * * For planes that use a shadow buffer, struct drm_shadow_plane_state * provides the regular plane state plus mappings of the shadow buffer * into kernel address space.
*/ struct drm_shadow_plane_state { /** @base: plane state */ struct drm_plane_state base;
/** * @fmtcnv_state: Format-conversion state * * Per-plane state for format conversion. * Flags for copying shadow buffers into backend storage. Also holds * temporary storage for format conversion.
*/ struct drm_format_conv_state fmtcnv_state;
/* Transitional state - do not export or duplicate */
/** * @map: Mappings of the plane's framebuffer BOs in to kernel address space * * The memory mappings stored in map should be established in the plane's * prepare_fb callback and removed in the cleanup_fb callback.
*/ struct iosys_map map[DRM_FORMAT_MAX_PLANES];
/** * @data: Address of each framebuffer BO's data * * The address of the data stored in each mapping. This is different * for framebuffers with non-zero offset fields.
*/ struct iosys_map data[DRM_FORMAT_MAX_PLANES];
};
/** * to_drm_shadow_plane_state - upcasts from struct drm_plane_state * @state: the plane state
*/ staticinlinestruct drm_shadow_plane_state *
to_drm_shadow_plane_state(struct drm_plane_state *state)
{ return container_of(state, struct drm_shadow_plane_state, base);
}
/** * DRM_GEM_SHADOW_PLANE_HELPER_FUNCS - * Initializes struct drm_plane_helper_funcs for shadow-buffered planes * * Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This * macro initializes struct drm_plane_helper_funcs to use the rsp helper * functions.
*/ #define DRM_GEM_SHADOW_PLANE_HELPER_FUNCS \
.begin_fb_access = drm_gem_begin_shadow_fb_access, \
.end_fb_access = drm_gem_end_shadow_fb_access
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