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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) panels to the front of the connector list, instead of | |
42 | * painstakingly trying to initialize them in the right order. | |
43 | */ | |
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 | 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); | |
56 | } | |
57 | ||
58 | list_splice(&panel_list, &dev->mode_config.connector_list); | |
59 | } | |
60 | EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); | |
61 | ||
62 | /** | |
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 | |
66 | * | |
67 | * This helper can be used in a drivers fb_create callback to pre-fill the fb's | |
68 | * metadata fields. | |
69 | */ | |
70 | void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, | |
71 | const struct drm_mode_fb_cmd2 *mode_cmd) | |
72 | { | |
73 | int i; | |
74 | ||
75 | fb->width = mode_cmd->width; | |
76 | fb->height = mode_cmd->height; | |
77 | for (i = 0; i < 4; i++) { | |
78 | fb->pitches[i] = mode_cmd->pitches[i]; | |
79 | fb->offsets[i] = mode_cmd->offsets[i]; | |
80 | fb->modifier[i] = mode_cmd->modifier[i]; | |
81 | } | |
82 | drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, | |
83 | &fb->bits_per_pixel); | |
84 | fb->pixel_format = mode_cmd->pixel_format; | |
85 | fb->flags = mode_cmd->flags; | |
86 | } | |
87 | EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); | |
88 | ||
89 | /* | |
90 | * This is the minimal list of formats that seem to be safe for modeset use | |
91 | * with all current DRM drivers. Most hardware can actually support more | |
92 | * formats than this and drivers may specify a more accurate list when | |
93 | * creating the primary plane. However drivers that still call | |
94 | * drm_plane_init() will use this minimal format list as the default. | |
95 | */ | |
96 | static const uint32_t safe_modeset_formats[] = { | |
97 | DRM_FORMAT_XRGB8888, | |
98 | DRM_FORMAT_ARGB8888, | |
99 | }; | |
100 | ||
101 | static struct drm_plane *create_primary_plane(struct drm_device *dev) | |
102 | { | |
103 | struct drm_plane *primary; | |
104 | int ret; | |
105 | ||
106 | primary = kzalloc(sizeof(*primary), GFP_KERNEL); | |
107 | if (primary == NULL) { | |
108 | DRM_DEBUG_KMS("Failed to allocate primary plane\n"); | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | /* | |
113 | * Remove the format_default field from drm_plane when dropping | |
114 | * this helper. | |
115 | */ | |
116 | primary->format_default = true; | |
117 | ||
118 | /* possible_crtc's will be filled in later by crtc_init */ | |
119 | ret = drm_universal_plane_init(dev, primary, 0, | |
120 | &drm_primary_helper_funcs, | |
121 | safe_modeset_formats, | |
122 | ARRAY_SIZE(safe_modeset_formats), | |
123 | DRM_PLANE_TYPE_PRIMARY, NULL); | |
124 | if (ret) { | |
125 | kfree(primary); | |
126 | primary = NULL; | |
127 | } | |
128 | ||
129 | return primary; | |
130 | } | |
131 | ||
132 | /** | |
133 | * drm_crtc_init - Legacy CRTC initialization function | |
134 | * @dev: DRM device | |
135 | * @crtc: CRTC object to init | |
136 | * @funcs: callbacks for the new CRTC | |
137 | * | |
138 | * Initialize a CRTC object with a default helper-provided primary plane and no | |
139 | * cursor plane. | |
140 | * | |
141 | * Returns: | |
142 | * Zero on success, error code on failure. | |
143 | */ | |
144 | int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, | |
145 | const struct drm_crtc_funcs *funcs) | |
146 | { | |
147 | struct drm_plane *primary; | |
148 | ||
149 | primary = create_primary_plane(dev); | |
150 | return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs, | |
151 | NULL); | |
152 | } | |
153 | EXPORT_SYMBOL(drm_crtc_init); |