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This should be implemented * if the display pipe has some sort of restriction in the modes * it can display. For example, a given display pipe may be responsible * to set a clock value. If the clock can not produce all the values * for the available modes then this callback can be used to restrict * the number of modes to only the ones that can be displayed. Another * reason can be bandwidth mitigation: the memory port on the display * controller can have bandwidth limitations not allowing pixel data * to be fetched at any rate. * * This hook is used by the probe helpers to filter the mode list in * drm_helper_probe_single_connector_modes(), and it is used by the * atomic helpers to validate modes supplied by userspace in * drm_atomic_helper_check_modeset(). * * This function is optional. * * NOTE: * * Since this function is both called from the check phase of an atomic * commit, and the mode validation in the probe paths it is not allowed * to look at anything else but the passed-in mode, and validate it * against configuration-invariant hardware constraints. * * RETURNS: * * drm_mode_status Enum */ enum drm_mode_status (*mode_valid)(struct drm_crtc *crtc, const struct drm_display_mode *mode); /** * @enable: * * This function should be used to enable the pipeline. * It is called when the underlying crtc is enabled. * This hook is optional. */ void (*enable)(struct drm_simple_display_pipe *pipe, struct drm_crtc_state *crtc_state, struct drm_plane_state *plane_state); /** * @disable: * * This function should be used to disable the pipeline. * It is called when the underlying crtc is disabled. * This hook is optional. */ void (*disable)(struct drm_simple_display_pipe *pipe); /** * @check: * * This function is called in the check phase of an atomic update, * specifically when the underlying plane is checked. * The simple display pipeline helpers already check that the plane is * not scaled, fills the entire visible area and is always enabled * when the crtc is also enabled. * This hook is optional. * * RETURNS: * * 0 on success, -EINVAL if the state or the transition can't be * supported, -ENOMEM on memory allocation failure and -EDEADLK if an * attempt to obtain another state object ran into a &drm_modeset_lock * deadlock. */ int (*check)(struct drm_simple_display_pipe *pipe, struct drm_plane_state *plane_state, struct drm_crtc_state *crtc_state); /** * @update: * * This function is called when the underlying plane state is updated. * This hook is optional. * * This is the function drivers should submit the * &drm_pending_vblank_event from. Using either * drm_crtc_arm_vblank_event(), when the driver supports vblank * interrupt handling, or drm_crtc_send_vblank_event() directly in case * the hardware lacks vblank support entirely. */ void (*update)(struct drm_simple_display_pipe *pipe, struct drm_plane_state *old_plane_state); /** * @prepare_fb: * * Optional, called by &drm_plane_helper_funcs.prepare_fb. Please read * the documentation for the &drm_plane_helper_funcs.prepare_fb hook for * more details. * * Drivers which always have their buffers pinned should use * drm_gem_fb_simple_display_pipe_prepare_fb() for this hook. */ int (*prepare_fb)(struct drm_simple_display_pipe *pipe, struct drm_plane_state *plane_state); /** * @cleanup_fb: * * Optional, called by &drm_plane_helper_funcs.cleanup_fb. Please read * the documentation for the &drm_plane_helper_funcs.cleanup_fb hook for * more details. */ void (*cleanup_fb)(struct drm_simple_display_pipe *pipe, struct drm_plane_state *plane_state); /** * @enable_vblank: * * Optional, called by &drm_crtc_funcs.enable_vblank. Please read * the documentation for the &drm_crtc_funcs.enable_vblank hook for * more details. */ int (*enable_vblank)(struct drm_simple_display_pipe *pipe); /** * @disable_vblank: * * Optional, called by &drm_crtc_funcs.disable_vblank. Please read * the documentation for the &drm_crtc_funcs.disable_vblank hook for * more details. */ void (*disable_vblank)(struct drm_simple_display_pipe *pipe); }; /** * struct drm_simple_display_pipe - simple display pipeline * @crtc: CRTC control structure * @plane: Plane control structure * @encoder: Encoder control structure * @connector: Connector control structure * @funcs: Pipeline control functions (optional) * * Simple display pipeline with plane, crtc and encoder collapsed into one * entity. It should be initialized by calling drm_simple_display_pipe_init(). */ struct drm_simple_display_pipe { struct drm_crtc crtc; struct drm_plane plane; struct drm_encoder encoder; struct drm_connector *connector; const struct drm_simple_display_pipe_funcs *funcs; }; int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe, struct drm_bridge *bridge); int drm_simple_display_pipe_init(struct drm_device *dev, struct drm_simple_display_pipe *pipe, const struct drm_simple_display_pipe_funcs *funcs, const uint32_t *formats, unsigned int format_count, const uint64_t *format_modifiers, struct drm_connector *connector); #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */