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