diff options
Diffstat (limited to 'drivers/gpu/drm/drm_simple_kms_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_simple_kms_helper.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c new file mode 100644 index 000000000000..0db36d27e90b --- /dev/null +++ b/drivers/gpu/drm/drm_simple_kms_helper.c @@ -0,0 +1,206 @@ +/* + * 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 <drm/drmP.h> +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_plane_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <linux/slab.h> + +/** + * 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, + plane_state->rotation, + 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"); |