247 lines
7.7 KiB
C
247 lines
7.7 KiB
C
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/*
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_modeset_helper.h>
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#include <drm/drm_plane_helper.h>
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#include <drm/drm_print.h>
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#include <drm/drm_probe_helper.h>
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/**
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* DOC: aux kms helpers
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*
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* This helper library contains various one-off functions which don't really fit
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* anywhere else in the DRM modeset helper library.
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*/
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/**
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* drm_helper_move_panel_connectors_to_head() - move panels to the front in the
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* connector list
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* @dev: drm device to operate on
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*
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* Some userspace presumes that the first connected connector is the main
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* display, where it's supposed to display e.g. the login screen. For
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* laptops, this should be the main panel. Use this function to sort all
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* (eDP/LVDS/DSI) panels to the front of the connector list, instead of
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* painstakingly trying to initialize them in the right order.
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*/
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void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
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{
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struct drm_connector *connector, *tmp;
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struct list_head panel_list;
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INIT_LIST_HEAD(&panel_list);
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spin_lock_irq(&dev->mode_config.connector_list_lock);
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list_for_each_entry_safe(connector, tmp,
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&dev->mode_config.connector_list, head) {
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if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
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connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
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connector->connector_type == DRM_MODE_CONNECTOR_DSI)
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list_move_tail(&connector->head, &panel_list);
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}
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list_splice(&panel_list, &dev->mode_config.connector_list);
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spin_unlock_irq(&dev->mode_config.connector_list_lock);
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}
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EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
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/**
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* drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
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* @dev: DRM device
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* @fb: drm_framebuffer object to fill out
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* @mode_cmd: metadata from the userspace fb creation request
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*
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* This helper can be used in a drivers fb_create callback to pre-fill the fb's
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* metadata fields.
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*/
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void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
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struct drm_framebuffer *fb,
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const struct drm_mode_fb_cmd2 *mode_cmd)
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{
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int i;
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fb->dev = dev;
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fb->format = drm_get_format_info(dev, mode_cmd);
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fb->width = mode_cmd->width;
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fb->height = mode_cmd->height;
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for (i = 0; i < 4; i++) {
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fb->pitches[i] = mode_cmd->pitches[i];
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fb->offsets[i] = mode_cmd->offsets[i];
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}
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fb->modifier = mode_cmd->modifier[0];
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fb->flags = mode_cmd->flags;
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}
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EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
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/*
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* This is the minimal list of formats that seem to be safe for modeset use
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* with all current DRM drivers. Most hardware can actually support more
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* formats than this and drivers may specify a more accurate list when
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* creating the primary plane.
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*/
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static const uint32_t safe_modeset_formats[] = {
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DRM_FORMAT_XRGB8888,
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DRM_FORMAT_ARGB8888,
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};
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static const struct drm_plane_funcs primary_plane_funcs = {
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DRM_PLANE_NON_ATOMIC_FUNCS,
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};
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/**
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* drm_crtc_init - Legacy CRTC initialization function
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* @dev: DRM device
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* @crtc: CRTC object to init
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* @funcs: callbacks for the new CRTC
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*
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* Initialize a CRTC object with a default helper-provided primary plane and no
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* cursor plane.
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*
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* Note that we make some assumptions about hardware limitations that may not be
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* true for all hardware:
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*
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* 1. Primary plane cannot be repositioned.
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* 2. Primary plane cannot be scaled.
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* 3. Primary plane must cover the entire CRTC.
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* 4. Subpixel positioning is not supported.
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* 5. The primary plane must always be on if the CRTC is enabled.
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*
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* This is purely a backwards compatibility helper for old drivers. Drivers
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* should instead implement their own primary plane. Atomic drivers must do so.
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* Drivers with the above hardware restriction can look into using &struct
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* drm_simple_display_pipe, which encapsulates the above limitations into a nice
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* interface.
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*
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* Returns:
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* Zero on success, error code on failure.
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*/
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int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
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const struct drm_crtc_funcs *funcs)
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{
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struct drm_plane *primary;
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int ret;
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/* possible_crtc's will be filled in later by crtc_init */
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primary = __drm_universal_plane_alloc(dev, sizeof(*primary), 0, 0,
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&primary_plane_funcs,
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safe_modeset_formats,
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ARRAY_SIZE(safe_modeset_formats),
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NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
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if (IS_ERR(primary))
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return PTR_ERR(primary);
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/*
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* Remove the format_default field from drm_plane when dropping
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* this helper.
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*/
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primary->format_default = true;
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ret = drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs, NULL);
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if (ret)
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goto err_drm_plane_cleanup;
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return 0;
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err_drm_plane_cleanup:
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drm_plane_cleanup(primary);
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kfree(primary);
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return ret;
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}
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EXPORT_SYMBOL(drm_crtc_init);
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/**
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* drm_mode_config_helper_suspend - Modeset suspend helper
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* @dev: DRM device
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*
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* This helper function takes care of suspending the modeset side. It disables
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* output polling if initialized, suspends fbdev if used and finally calls
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* drm_atomic_helper_suspend().
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* If suspending fails, fbdev and polling is re-enabled.
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*
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* Returns:
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* Zero on success, negative error code on error.
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*
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* See also:
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* drm_kms_helper_poll_disable() and drm_fb_helper_set_suspend_unlocked().
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*/
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int drm_mode_config_helper_suspend(struct drm_device *dev)
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{
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struct drm_atomic_state *state;
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if (!dev)
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return 0;
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drm_kms_helper_poll_disable(dev);
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drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 1);
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state = drm_atomic_helper_suspend(dev);
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if (IS_ERR(state)) {
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drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
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drm_kms_helper_poll_enable(dev);
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return PTR_ERR(state);
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}
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dev->mode_config.suspend_state = state;
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return 0;
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}
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EXPORT_SYMBOL(drm_mode_config_helper_suspend);
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/**
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* drm_mode_config_helper_resume - Modeset resume helper
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* @dev: DRM device
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*
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* This helper function takes care of resuming the modeset side. It calls
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* drm_atomic_helper_resume(), resumes fbdev if used and enables output polling
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* if initiaized.
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*
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* Returns:
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* Zero on success, negative error code on error.
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*
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* See also:
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* drm_fb_helper_set_suspend_unlocked() and drm_kms_helper_poll_enable().
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*/
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int drm_mode_config_helper_resume(struct drm_device *dev)
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{
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int ret;
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if (!dev)
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return 0;
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if (WARN_ON(!dev->mode_config.suspend_state))
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return -EINVAL;
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ret = drm_atomic_helper_resume(dev, dev->mode_config.suspend_state);
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if (ret)
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DRM_ERROR("Failed to resume (%d)\n", ret);
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dev->mode_config.suspend_state = NULL;
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drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
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drm_kms_helper_poll_enable(dev);
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return ret;
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}
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EXPORT_SYMBOL(drm_mode_config_helper_resume);
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