Provides helper functions for drivers that have a simple display pipeline. Plane, crtc and encoder are collapsed into one entity.
Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/Kconfig | 7 ++ drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_simple_kms_helper.c | 157 ++++++++++++++++++++++++++++++++ include/drm/drm_simple_kms_helper.h | 88 ++++++++++++++++++ 4 files changed, 253 insertions(+) create mode 100644 drivers/gpu/drm/drm_simple_kms_helper.c create mode 100644 include/drm/drm_simple_kms_helper.h
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 16e4c21..ff9f480 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -39,6 +39,13 @@ config DRM_KMS_HELPER help CRTC helpers for KMS drivers.
+config DRM_SIMPLE_KMS_HELPER + tristate + depends on DRM + select DRM_KMS_HELPER + help + Helpers for very simple KMS drivers. + config DRM_KMS_FB_HELPER bool depends on DRM_KMS_HELPER diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 43c2abf..7e99923 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -31,6 +31,7 @@ drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o drm_kms_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o +obj-$(CONFIG_DRM_SIMPLE_KMS_HELPER) += drm_simple_kms_helper.o
CFLAGS_drm_trace_points.o := -I$(src)
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 0000000..c8725bb --- /dev/null +++ b/drivers/gpu/drm/drm_simple_kms_helper.c @@ -0,0 +1,157 @@ +/* + * 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> + +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 *pstate) +{ + struct drm_simple_display_pipe *pipe; + struct drm_crtc_state *cstate; + + pipe = container_of(plane, struct drm_simple_display_pipe, plane); + if (!pipe->funcs || !pipe->funcs->check) + return 0; + + cstate = drm_atomic_get_existing_crtc_state(pstate->state, + &pipe->crtc); + + return pipe->funcs->check(pipe, pstate, cstate); +} + +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 + * @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. + * + * Returns: + * Zero on success, error code on failure. + */ +int drm_simple_display_pipe_init(struct drm_device *dev, + struct drm_simple_display_pipe *pipe, + 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->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; + + ret = drm_mode_connector_attach_encoder(connector, encoder); + if (ret) + return ret; + + return drm_connector_register(connector); +} +EXPORT_SYMBOL(drm_simple_display_pipe_init); + +MODULE_LICENSE("GPL"); diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h new file mode 100644 index 0000000..69eac94 --- /dev/null +++ b/include/drm/drm_simple_kms_helper.h @@ -0,0 +1,88 @@ +/* + * 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. + */ + +#ifndef __LINUX_DRM_SIMPLE_KMS_HELPER_H +#define __LINUX_DRM_SIMPLE_KMS_HELPER_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 { + /** + * @enable: + * + * This function should be used to enable the pipeline. + * It is called when the underlying crtc is enabled. + */ + void (*enable)(struct drm_simple_display_pipe *pipe, + struct drm_crtc_state *crtc_state); + /** + * @disable: + * + * This function should be used to disable the pipeline. + * It is called when the underlying crtc is disabled. + */ + 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. + * + * 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. + */ + void (*update)(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *plane_state); +}; + +/** + * 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. + */ +struct drm_simple_display_pipe { + struct drm_crtc crtc; + struct drm_plane plane; + struct drm_encoder encoder; + struct drm_connector *connector; + + struct drm_simple_display_pipe_funcs *funcs; +}; + +int drm_simple_display_pipe_init(struct drm_device *dev, + struct drm_simple_display_pipe *pipe, + struct drm_simple_display_pipe_funcs *funcs, + const uint32_t *formats, + unsigned int format_count, + struct drm_connector *connector); + +#endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */