213 lines
7.1 KiB
C
213 lines
7.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2016 Noralf Trønnes
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*/
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#ifndef __LINUX_DRM_SIMPLE_KMS_HELPER_H
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#define __LINUX_DRM_SIMPLE_KMS_HELPER_H
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#include <drm/drm_crtc.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_plane.h>
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struct drm_simple_display_pipe;
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/**
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* struct drm_simple_display_pipe_funcs - helper operations for a simple
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* display pipeline
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*/
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struct drm_simple_display_pipe_funcs {
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/**
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* @mode_valid:
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*
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* This callback is used to check if a specific mode is valid in the
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* crtc used in this simple display pipe. This should be implemented
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* if the display pipe has some sort of restriction in the modes
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* it can display. For example, a given display pipe may be responsible
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* to set a clock value. If the clock can not produce all the values
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* for the available modes then this callback can be used to restrict
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* the number of modes to only the ones that can be displayed. Another
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* reason can be bandwidth mitigation: the memory port on the display
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* controller can have bandwidth limitations not allowing pixel data
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* to be fetched at any rate.
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*
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* This hook is used by the probe helpers to filter the mode list in
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* drm_helper_probe_single_connector_modes(), and it is used by the
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* atomic helpers to validate modes supplied by userspace in
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* drm_atomic_helper_check_modeset().
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*
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* This function is optional.
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*
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* NOTE:
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*
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* Since this function is both called from the check phase of an atomic
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* commit, and the mode validation in the probe paths it is not allowed
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* to look at anything else but the passed-in mode, and validate it
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* against configuration-invariant hardware constraints.
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*
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* RETURNS:
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*
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* drm_mode_status Enum
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*/
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enum drm_mode_status (*mode_valid)(struct drm_simple_display_pipe *pipe,
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const struct drm_display_mode *mode);
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/**
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* @enable:
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*
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* This function should be used to enable the pipeline.
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* It is called when the underlying crtc is enabled.
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* This hook is optional.
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*/
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void (*enable)(struct drm_simple_display_pipe *pipe,
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struct drm_crtc_state *crtc_state,
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struct drm_plane_state *plane_state);
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/**
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* @disable:
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*
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* This function should be used to disable the pipeline.
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* It is called when the underlying crtc is disabled.
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* This hook is optional.
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*/
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void (*disable)(struct drm_simple_display_pipe *pipe);
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/**
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* @check:
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*
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* This function is called in the check phase of an atomic update,
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* specifically when the underlying plane is checked.
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* The simple display pipeline helpers already check that the plane is
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* not scaled, fills the entire visible area and is always enabled
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* when the crtc is also enabled.
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* This hook is optional.
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*
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* RETURNS:
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*
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* 0 on success, -EINVAL if the state or the transition can't be
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* supported, -ENOMEM on memory allocation failure and -EDEADLK if an
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* attempt to obtain another state object ran into a &drm_modeset_lock
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* deadlock.
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*/
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int (*check)(struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *plane_state,
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struct drm_crtc_state *crtc_state);
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/**
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* @update:
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*
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* This function is called when the underlying plane state is updated.
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* This hook is optional.
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*
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* This is the function drivers should submit the
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* &drm_pending_vblank_event from. Using either
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* drm_crtc_arm_vblank_event(), when the driver supports vblank
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* interrupt handling, or drm_crtc_send_vblank_event() for more
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* complex case. In case the hardware lacks vblank support entirely,
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* drivers can set &struct drm_crtc_state.no_vblank in
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* &struct drm_simple_display_pipe_funcs.check and let DRM's
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* atomic helper fake a vblank event.
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*/
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void (*update)(struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *old_plane_state);
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/**
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* @prepare_fb:
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*
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* Optional, called by &drm_plane_helper_funcs.prepare_fb. Please read
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* the documentation for the &drm_plane_helper_funcs.prepare_fb hook for
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* more details.
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*
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* Drivers which always have their buffers pinned should use
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* drm_gem_fb_simple_display_pipe_prepare_fb() for this hook.
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*/
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int (*prepare_fb)(struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *plane_state);
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/**
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* @cleanup_fb:
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*
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* Optional, called by &drm_plane_helper_funcs.cleanup_fb. Please read
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* the documentation for the &drm_plane_helper_funcs.cleanup_fb hook for
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* more details.
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*/
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void (*cleanup_fb)(struct drm_simple_display_pipe *pipe,
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struct drm_plane_state *plane_state);
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/**
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* @enable_vblank:
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*
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* Optional, called by &drm_crtc_funcs.enable_vblank. Please read
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* the documentation for the &drm_crtc_funcs.enable_vblank hook for
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* more details.
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*/
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int (*enable_vblank)(struct drm_simple_display_pipe *pipe);
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/**
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* @disable_vblank:
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*
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* Optional, called by &drm_crtc_funcs.disable_vblank. Please read
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* the documentation for the &drm_crtc_funcs.disable_vblank hook for
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* more details.
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*/
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void (*disable_vblank)(struct drm_simple_display_pipe *pipe);
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};
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/**
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* struct drm_simple_display_pipe - simple display pipeline
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* @crtc: CRTC control structure
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* @plane: Plane control structure
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* @encoder: Encoder control structure
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* @connector: Connector control structure
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* @funcs: Pipeline control functions (optional)
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*
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* Simple display pipeline with plane, crtc and encoder collapsed into one
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* entity. It should be initialized by calling drm_simple_display_pipe_init().
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*/
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struct drm_simple_display_pipe {
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struct drm_crtc crtc;
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struct drm_plane plane;
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struct drm_encoder encoder;
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struct drm_connector *connector;
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const struct drm_simple_display_pipe_funcs *funcs;
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};
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int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
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struct drm_bridge *bridge);
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int drm_simple_display_pipe_init(struct drm_device *dev,
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struct drm_simple_display_pipe *pipe,
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const struct drm_simple_display_pipe_funcs *funcs,
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const uint32_t *formats, unsigned int format_count,
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const uint64_t *format_modifiers,
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struct drm_connector *connector);
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int drm_simple_encoder_init(struct drm_device *dev,
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struct drm_encoder *encoder,
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int encoder_type);
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void *__drmm_simple_encoder_alloc(struct drm_device *dev, size_t size,
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size_t offset, int encoder_type);
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/**
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* drmm_simple_encoder_alloc - Allocate and initialize an encoder with basic
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* functionality.
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* @dev: drm device
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* @type: the type of the struct which contains struct &drm_encoder
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* @member: the name of the &drm_encoder within @type.
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* @encoder_type: user visible type of the encoder
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*
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* Allocates and initializes an encoder that has no further functionality.
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* Settings for possible CRTC and clones are left to their initial values.
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* Cleanup is automatically handled through registering drm_encoder_cleanup()
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* with drmm_add_action().
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*
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* Returns:
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* Pointer to new encoder, or ERR_PTR on failure.
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*/
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#define drmm_simple_encoder_alloc(dev, type, member, encoder_type) \
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((type *)__drmm_simple_encoder_alloc(dev, sizeof(type), \
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offsetof(type, member), \
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encoder_type))
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#endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */
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