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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2016 Noralf Trønnes
*/
#ifndef __LINUX_DRM_SIMPLE_KMS_HELPER_H
#define __LINUX_DRM_SIMPLE_KMS_HELPER_H
#include <drm/drm_crtc.h>
#include <drm/drm_encoder.h>
#include <drm/drm_plane.h>
struct drm_simple_display_pipe;
/**
* struct drm_simple_display_pipe_funcs - helper operations for a simple
* display pipeline
*/
struct drm_simple_display_pipe_funcs {
/**
* @mode_valid:
*
* This callback is used to check if a specific mode is valid in the
* crtc used in this simple display pipe. 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() for more
* complex case. In case the hardware lacks vblank support entirely,
* drivers can set &struct drm_crtc_state.no_vblank in
* &struct drm_simple_display_pipe_funcs.check and let DRM's
* atomic helper fake a vblank event.
*/
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 */
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