/* * Copyright (C) 2016 Noralf Trønnes * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include #include #include /** * DOC: overview * * This helper library provides helpers for drivers for simple display * hardware. * * drm_simple_display_pipe_init() initializes a simple display pipeline * which has only one full-screen scanout buffer feeding one output. The * pipeline is represented by struct &drm_simple_display_pipe and binds * together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed * entity. Some flexibility for code reuse is provided through a separately * allocated &drm_connector object and supporting optional &drm_bridge * encoder drivers. */ static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = { .destroy = drm_encoder_cleanup, }; static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc) { struct drm_simple_display_pipe *pipe; pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); if (!pipe->funcs || !pipe->funcs->enable) return; pipe->funcs->enable(pipe, crtc->state); } static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc) { struct drm_simple_display_pipe *pipe; pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); if (!pipe->funcs || !pipe->funcs->disable) return; pipe->funcs->disable(pipe); } static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = { .disable = drm_simple_kms_crtc_disable, .enable = drm_simple_kms_crtc_enable, }; static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = { .reset = drm_atomic_helper_crtc_reset, .destroy = drm_crtc_cleanup, .set_config = drm_atomic_helper_set_config, .page_flip = drm_atomic_helper_page_flip, .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, }; static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane, struct drm_plane_state *plane_state) { struct drm_rect src = { .x1 = plane_state->src_x, .y1 = plane_state->src_y, .x2 = plane_state->src_x + plane_state->src_w, .y2 = plane_state->src_y + plane_state->src_h, }; struct drm_rect dest = { .x1 = plane_state->crtc_x, .y1 = plane_state->crtc_y, .x2 = plane_state->crtc_x + plane_state->crtc_w, .y2 = plane_state->crtc_y + plane_state->crtc_h, }; struct drm_rect clip = { 0 }; struct drm_simple_display_pipe *pipe; struct drm_crtc_state *crtc_state; bool visible; int ret; pipe = container_of(plane, struct drm_simple_display_pipe, plane); crtc_state = drm_atomic_get_existing_crtc_state(plane_state->state, &pipe->crtc); if (crtc_state->enable != !!plane_state->crtc) return -EINVAL; /* plane must match crtc enable state */ if (!crtc_state->enable) return 0; /* nothing to check when disabling or disabled */ clip.x2 = crtc_state->adjusted_mode.hdisplay; clip.y2 = crtc_state->adjusted_mode.vdisplay; ret = drm_plane_helper_check_update(plane, &pipe->crtc, plane_state->fb, &src, &dest, &clip, DRM_PLANE_HELPER_NO_SCALING, DRM_PLANE_HELPER_NO_SCALING, false, true, &visible); if (ret) return ret; if (!visible) return -EINVAL; if (!pipe->funcs || !pipe->funcs->check) return 0; return pipe->funcs->check(pipe, plane_state, crtc_state); } static void drm_simple_kms_plane_atomic_update(struct drm_plane *plane, struct drm_plane_state *pstate) { struct drm_simple_display_pipe *pipe; pipe = container_of(plane, struct drm_simple_display_pipe, plane); if (!pipe->funcs || !pipe->funcs->update) return; pipe->funcs->update(pipe, pstate); } static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = { .atomic_check = drm_simple_kms_plane_atomic_check, .atomic_update = drm_simple_kms_plane_atomic_update, }; static const struct drm_plane_funcs drm_simple_kms_plane_funcs = { .update_plane = drm_atomic_helper_update_plane, .disable_plane = drm_atomic_helper_disable_plane, .destroy = drm_plane_cleanup, .reset = drm_atomic_helper_plane_reset, .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, }; /** * drm_simple_display_pipe_init - Initialize a simple display pipeline * @dev: DRM device * @pipe: simple display pipe object to initialize * @funcs: callbacks for the display pipe (optional) * @formats: array of supported formats (%DRM_FORMAT_*) * @format_count: number of elements in @formats * @connector: connector to attach and register * * Sets up a display pipeline which consist of a really simple * plane-crtc-encoder pipe coupled with the provided connector. * Teardown of a simple display pipe is all handled automatically by the drm * core through calling drm_mode_config_cleanup(). Drivers afterwards need to * release the memory for the structure themselves. * * Returns: * Zero on success, negative error code on failure. */ 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, struct drm_connector *connector) { struct drm_encoder *encoder = &pipe->encoder; struct drm_plane *plane = &pipe->plane; struct drm_crtc *crtc = &pipe->crtc; int ret; pipe->connector = connector; pipe->funcs = funcs; drm_plane_helper_add(plane, &drm_simple_kms_plane_helper_funcs); ret = drm_universal_plane_init(dev, plane, 0, &drm_simple_kms_plane_funcs, formats, format_count, DRM_PLANE_TYPE_PRIMARY, NULL); if (ret) return ret; drm_crtc_helper_add(crtc, &drm_simple_kms_crtc_helper_funcs); ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL, &drm_simple_kms_crtc_funcs, NULL); if (ret) return ret; encoder->possible_crtcs = 1 << drm_crtc_index(crtc); ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); if (ret) return ret; return drm_mode_connector_attach_encoder(connector, encoder); } EXPORT_SYMBOL(drm_simple_display_pipe_init); MODULE_LICENSE("GPL");