2 * Copyright (c) 2016 Intel Corporation
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5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
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14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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23 #include <drm/drm_modeset_helper.h>
24 #include <drm/drm_plane_helper.h>
27 * DOC: aux kms helpers
29 * This helper library contains various one-off functions which don't really fit
30 * anywhere else in the DRM modeset helper library.
34 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
36 * @dev: drm device to operate on
38 * Some userspace presumes that the first connected connector is the main
39 * display, where it's supposed to display e.g. the login screen. For
40 * laptops, this should be the main panel. Use this function to sort all
41 * (eDP/LVDS) panels to the front of the connector list, instead of
42 * painstakingly trying to initialize them in the right order.
44 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
46 struct drm_connector *connector, *tmp;
47 struct list_head panel_list;
49 INIT_LIST_HEAD(&panel_list);
51 list_for_each_entry_safe(connector, tmp,
52 &dev->mode_config.connector_list, head) {
53 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
54 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
55 list_move_tail(&connector->head, &panel_list);
58 list_splice(&panel_list, &dev->mode_config.connector_list);
60 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
63 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
64 * @fb: drm_framebuffer object to fill out
65 * @mode_cmd: metadata from the userspace fb creation request
67 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
70 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
71 const struct drm_mode_fb_cmd2 *mode_cmd)
73 const struct drm_format_info *info;
76 info = drm_format_info(mode_cmd->pixel_format);
77 if (!info || !info->depth) {
78 char *format_name = drm_get_format_name(mode_cmd->pixel_format);
80 DRM_DEBUG_KMS("non-RGB pixel format %s\n", format_name);
84 fb->bits_per_pixel = 0;
86 fb->depth = info->depth;
87 fb->bits_per_pixel = info->cpp[0] * 8;
90 fb->width = mode_cmd->width;
91 fb->height = mode_cmd->height;
92 for (i = 0; i < 4; i++) {
93 fb->pitches[i] = mode_cmd->pitches[i];
94 fb->offsets[i] = mode_cmd->offsets[i];
95 fb->modifier[i] = mode_cmd->modifier[i];
97 fb->pixel_format = mode_cmd->pixel_format;
98 fb->flags = mode_cmd->flags;
100 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
103 * This is the minimal list of formats that seem to be safe for modeset use
104 * with all current DRM drivers. Most hardware can actually support more
105 * formats than this and drivers may specify a more accurate list when
106 * creating the primary plane. However drivers that still call
107 * drm_plane_init() will use this minimal format list as the default.
109 static const uint32_t safe_modeset_formats[] = {
114 static struct drm_plane *create_primary_plane(struct drm_device *dev)
116 struct drm_plane *primary;
119 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
120 if (primary == NULL) {
121 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
126 * Remove the format_default field from drm_plane when dropping
129 primary->format_default = true;
131 /* possible_crtc's will be filled in later by crtc_init */
132 ret = drm_universal_plane_init(dev, primary, 0,
133 &drm_primary_helper_funcs,
134 safe_modeset_formats,
135 ARRAY_SIZE(safe_modeset_formats),
136 DRM_PLANE_TYPE_PRIMARY, NULL);
146 * drm_crtc_init - Legacy CRTC initialization function
148 * @crtc: CRTC object to init
149 * @funcs: callbacks for the new CRTC
151 * Initialize a CRTC object with a default helper-provided primary plane and no
155 * Zero on success, error code on failure.
157 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
158 const struct drm_crtc_funcs *funcs)
160 struct drm_plane *primary;
162 primary = create_primary_plane(dev);
163 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
166 EXPORT_SYMBOL(drm_crtc_init);