1 /*
2 * Copyright (c) 2016 Intel Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
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
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
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
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23 #include <drm/drm_modeset_helper.h>
24 #include <drm/drm_plane_helper.h>
25
26 /**
27 * DOC: aux kms helpers
28 *
29 * This helper library contains various one-off functions which don't really fit
30 * anywhere else in the DRM modeset helper library.
31 */
32
33 /**
34 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
35 * connector list
36 * @dev: drm device to operate on
37 *
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/DSI) panels to the front of the connector list, instead of
42 * painstakingly trying to initialize them in the right order.
43 */
drm_helper_move_panel_connectors_to_head(struct drm_device * dev)44 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
45 {
46 struct drm_connector *connector, *tmp;
47 struct list_head panel_list;
48
49 INIT_LIST_HEAD(&panel_list);
50
51 spin_lock_irq(&dev->mode_config.connector_list_lock);
52 list_for_each_entry_safe(connector, tmp,
53 &dev->mode_config.connector_list, head) {
54 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
55 connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
56 connector->connector_type == DRM_MODE_CONNECTOR_DSI)
57 list_move_tail(&connector->head, &panel_list);
58 }
59
60 list_splice(&panel_list, &dev->mode_config.connector_list);
61 spin_unlock_irq(&dev->mode_config.connector_list_lock);
62 }
63 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
64
65 /**
66 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
67 * @dev: DRM device
68 * @fb: drm_framebuffer object to fill out
69 * @mode_cmd: metadata from the userspace fb creation request
70 *
71 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
72 * metadata fields.
73 */
drm_helper_mode_fill_fb_struct(struct drm_device * dev,struct drm_framebuffer * fb,const struct drm_mode_fb_cmd2 * mode_cmd)74 void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
75 struct drm_framebuffer *fb,
76 const struct drm_mode_fb_cmd2 *mode_cmd)
77 {
78 int i;
79
80 fb->dev = dev;
81 fb->format = drm_get_format_info(dev, mode_cmd);
82 fb->width = mode_cmd->width;
83 fb->height = mode_cmd->height;
84 for (i = 0; i < 4; i++) {
85 fb->pitches[i] = mode_cmd->pitches[i];
86 fb->offsets[i] = mode_cmd->offsets[i];
87 }
88 fb->modifier = mode_cmd->modifier[0];
89 fb->flags = mode_cmd->flags;
90 }
91 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
92
93 /*
94 * This is the minimal list of formats that seem to be safe for modeset use
95 * with all current DRM drivers. Most hardware can actually support more
96 * formats than this and drivers may specify a more accurate list when
97 * creating the primary plane. However drivers that still call
98 * drm_plane_init() will use this minimal format list as the default.
99 */
100 static const uint32_t safe_modeset_formats[] = {
101 DRM_FORMAT_XRGB8888,
102 DRM_FORMAT_ARGB8888,
103 };
104
create_primary_plane(struct drm_device * dev)105 static struct drm_plane *create_primary_plane(struct drm_device *dev)
106 {
107 struct drm_plane *primary;
108 int ret;
109
110 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
111 if (primary == NULL) {
112 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
113 return NULL;
114 }
115
116 /*
117 * Remove the format_default field from drm_plane when dropping
118 * this helper.
119 */
120 primary->format_default = true;
121
122 /* possible_crtc's will be filled in later by crtc_init */
123 ret = drm_universal_plane_init(dev, primary, 0,
124 &drm_primary_helper_funcs,
125 safe_modeset_formats,
126 ARRAY_SIZE(safe_modeset_formats),
127 NULL,
128 DRM_PLANE_TYPE_PRIMARY, NULL);
129 if (ret) {
130 kfree(primary);
131 primary = NULL;
132 }
133
134 return primary;
135 }
136
137 /**
138 * drm_crtc_init - Legacy CRTC initialization function
139 * @dev: DRM device
140 * @crtc: CRTC object to init
141 * @funcs: callbacks for the new CRTC
142 *
143 * Initialize a CRTC object with a default helper-provided primary plane and no
144 * cursor plane.
145 *
146 * Returns:
147 * Zero on success, error code on failure.
148 */
drm_crtc_init(struct drm_device * dev,struct drm_crtc * crtc,const struct drm_crtc_funcs * funcs)149 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
150 const struct drm_crtc_funcs *funcs)
151 {
152 struct drm_plane *primary;
153
154 primary = create_primary_plane(dev);
155 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
156 NULL);
157 }
158 EXPORT_SYMBOL(drm_crtc_init);
159