260 lines
8.1 KiB
C
260 lines
8.1 KiB
C
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/*
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* Copyright (C) 2016 Noralf Trønnes
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_plane_helper.h>
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#include <drm/drm_simple_kms_helper.h>
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#include <linux/slab.h>
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/**
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* DOC: overview
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*
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* This helper library provides helpers for drivers for simple display
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* hardware.
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*
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* drm_simple_display_pipe_init() initializes a simple display pipeline
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* which has only one full-screen scanout buffer feeding one output. The
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* pipeline is represented by &struct drm_simple_display_pipe and binds
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* together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed
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* entity. Some flexibility for code reuse is provided through a separately
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* allocated &drm_connector object and supporting optional &drm_bridge
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* encoder drivers.
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*/
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static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
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.destroy = drm_encoder_cleanup,
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};
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static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
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struct drm_crtc_state *state)
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{
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bool has_primary = state->plane_mask &
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BIT(drm_plane_index(crtc->primary));
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/* We always want to have an active plane with an active CRTC */
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if (has_primary != state->enable)
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return -EINVAL;
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return drm_atomic_add_affected_planes(state->state, crtc);
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}
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static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc,
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struct drm_crtc_state *old_state)
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{
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struct drm_simple_display_pipe *pipe;
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
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if (!pipe->funcs || !pipe->funcs->enable)
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return;
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pipe->funcs->enable(pipe, crtc->state);
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}
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static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc,
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struct drm_crtc_state *old_state)
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{
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struct drm_simple_display_pipe *pipe;
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
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if (!pipe->funcs || !pipe->funcs->disable)
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return;
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pipe->funcs->disable(pipe);
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}
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static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
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.atomic_check = drm_simple_kms_crtc_check,
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.atomic_enable = drm_simple_kms_crtc_enable,
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.atomic_disable = drm_simple_kms_crtc_disable,
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};
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static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
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.reset = drm_atomic_helper_crtc_reset,
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.destroy = drm_crtc_cleanup,
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.set_config = drm_atomic_helper_set_config,
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.page_flip = drm_atomic_helper_page_flip,
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.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
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};
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static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane,
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struct drm_plane_state *plane_state)
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{
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struct drm_rect clip = { 0 };
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struct drm_simple_display_pipe *pipe;
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struct drm_crtc_state *crtc_state;
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int ret;
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pipe = container_of(plane, struct drm_simple_display_pipe, plane);
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crtc_state = drm_atomic_get_new_crtc_state(plane_state->state,
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&pipe->crtc);
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if (!crtc_state->enable)
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return 0; /* nothing to check when disabling or disabled */
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clip.x2 = crtc_state->adjusted_mode.hdisplay;
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clip.y2 = crtc_state->adjusted_mode.vdisplay;
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ret = drm_plane_helper_check_state(plane_state, &clip,
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DRM_PLANE_HELPER_NO_SCALING,
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DRM_PLANE_HELPER_NO_SCALING,
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false, true);
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if (ret)
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return ret;
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if (!plane_state->visible)
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return -EINVAL;
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if (!pipe->funcs || !pipe->funcs->check)
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return 0;
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return pipe->funcs->check(pipe, plane_state, crtc_state);
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}
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static void drm_simple_kms_plane_atomic_update(struct drm_plane *plane,
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struct drm_plane_state *old_pstate)
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{
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struct drm_simple_display_pipe *pipe;
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pipe = container_of(plane, struct drm_simple_display_pipe, plane);
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if (!pipe->funcs || !pipe->funcs->update)
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return;
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pipe->funcs->update(pipe, old_pstate);
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}
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static int drm_simple_kms_plane_prepare_fb(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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struct drm_simple_display_pipe *pipe;
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pipe = container_of(plane, struct drm_simple_display_pipe, plane);
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if (!pipe->funcs || !pipe->funcs->prepare_fb)
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return 0;
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return pipe->funcs->prepare_fb(pipe, state);
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}
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static void drm_simple_kms_plane_cleanup_fb(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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struct drm_simple_display_pipe *pipe;
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pipe = container_of(plane, struct drm_simple_display_pipe, plane);
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if (!pipe->funcs || !pipe->funcs->cleanup_fb)
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return;
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pipe->funcs->cleanup_fb(pipe, state);
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}
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static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = {
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.prepare_fb = drm_simple_kms_plane_prepare_fb,
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.cleanup_fb = drm_simple_kms_plane_cleanup_fb,
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.atomic_check = drm_simple_kms_plane_atomic_check,
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.atomic_update = drm_simple_kms_plane_atomic_update,
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};
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static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
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.update_plane = drm_atomic_helper_update_plane,
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.disable_plane = drm_atomic_helper_disable_plane,
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.destroy = drm_plane_cleanup,
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.reset = drm_atomic_helper_plane_reset,
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.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
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};
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/**
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* drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
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* @pipe: simple display pipe object
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* @bridge: bridge to attach
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*
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* Makes it possible to still use the drm_simple_display_pipe helpers when
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* a DRM bridge has to be used.
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*
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* Note that you probably want to initialize the pipe by passing a NULL
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* connector to drm_simple_display_pipe_init().
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*
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* Returns:
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* Zero on success, negative error code on failure.
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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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{
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return drm_bridge_attach(&pipe->encoder, bridge, NULL);
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}
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EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
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/**
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* drm_simple_display_pipe_init - Initialize a simple display pipeline
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* @dev: DRM device
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* @pipe: simple display pipe object to initialize
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* @funcs: callbacks for the display pipe (optional)
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* @formats: array of supported formats (DRM_FORMAT\_\*)
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* @format_count: number of elements in @formats
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* @format_modifiers: array of formats modifiers
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* @connector: connector to attach and register (optional)
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*
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* Sets up a display pipeline which consist of a really simple
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* plane-crtc-encoder pipe.
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*
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* If a connector is supplied, the pipe will be coupled with the provided
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* connector. You may supply a NULL connector when using drm bridges, that
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* handle connectors themselves (see drm_simple_display_pipe_attach_bridge()).
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*
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* Teardown of a simple display pipe is all handled automatically by the drm
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* core through calling drm_mode_config_cleanup(). Drivers afterwards need to
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* release the memory for the structure themselves.
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*
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* Returns:
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* Zero on success, negative error code on failure.
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*/
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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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{
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struct drm_encoder *encoder = &pipe->encoder;
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struct drm_plane *plane = &pipe->plane;
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struct drm_crtc *crtc = &pipe->crtc;
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int ret;
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pipe->connector = connector;
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pipe->funcs = funcs;
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drm_plane_helper_add(plane, &drm_simple_kms_plane_helper_funcs);
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ret = drm_universal_plane_init(dev, plane, 0,
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&drm_simple_kms_plane_funcs,
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formats, format_count,
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format_modifiers,
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DRM_PLANE_TYPE_PRIMARY, NULL);
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if (ret)
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return ret;
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drm_crtc_helper_add(crtc, &drm_simple_kms_crtc_helper_funcs);
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ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
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&drm_simple_kms_crtc_funcs, NULL);
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if (ret)
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return ret;
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encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
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ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
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DRM_MODE_ENCODER_NONE, NULL);
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if (ret || !connector)
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return ret;
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return drm_mode_connector_attach_encoder(connector, encoder);
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}
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EXPORT_SYMBOL(drm_simple_display_pipe_init);
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MODULE_LICENSE("GPL");
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