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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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+
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+#include <drm/drm_modeset_helper.h>
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+#include <drm/drm_plane_helper.h>
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+
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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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+/**
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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) 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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+
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+ INIT_LIST_HEAD(&panel_list);
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+
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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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+ list_move_tail(&connector->head, &panel_list);
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+ }
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+
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+ list_splice(&panel_list, &dev->mode_config.connector_list);
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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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+/**
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+ * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
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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_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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+
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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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+ fb->modifier[i] = mode_cmd->modifier[i];
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+ }
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+ drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
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+ &fb->bits_per_pixel);
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+ fb->pixel_format = mode_cmd->pixel_format;
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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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+/*
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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. However drivers that still call
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+ * drm_plane_init() will use this minimal format list as the default.
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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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+
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+static struct drm_plane *create_primary_plane(struct drm_device *dev)
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+{
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+ struct drm_plane *primary;
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+ int ret;
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+
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+ primary = kzalloc(sizeof(*primary), GFP_KERNEL);
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+ if (primary == NULL) {
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+ DRM_DEBUG_KMS("Failed to allocate primary plane\n");
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+ return NULL;
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+ }
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+
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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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+
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+ /* possible_crtc's will be filled in later by crtc_init */
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+ ret = drm_universal_plane_init(dev, primary, 0,
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+ &drm_primary_helper_funcs,
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+ safe_modeset_formats,
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+ ARRAY_SIZE(safe_modeset_formats),
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+ DRM_PLANE_TYPE_PRIMARY, NULL);
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+ if (ret) {
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+ kfree(primary);
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+ primary = NULL;
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+ }
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+
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+ return primary;
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+}
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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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+ * 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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+
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+ primary = create_primary_plane(dev);
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+ return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
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+ NULL);
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+}
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+EXPORT_SYMBOL(drm_crtc_init);
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Daniel Vetter