Branch data Line data Source code
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_atomic_helper.h>
24 : : #include <drm/drm_fb_helper.h>
25 : : #include <drm/drm_fourcc.h>
26 : : #include <drm/drm_modeset_helper.h>
27 : : #include <drm/drm_plane_helper.h>
28 : : #include <drm/drm_print.h>
29 : : #include <drm/drm_probe_helper.h>
30 : :
31 : : /**
32 : : * DOC: aux kms helpers
33 : : *
34 : : * This helper library contains various one-off functions which don't really fit
35 : : * anywhere else in the DRM modeset helper library.
36 : : */
37 : :
38 : : /**
39 : : * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
40 : : * connector list
41 : : * @dev: drm device to operate on
42 : : *
43 : : * Some userspace presumes that the first connected connector is the main
44 : : * display, where it's supposed to display e.g. the login screen. For
45 : : * laptops, this should be the main panel. Use this function to sort all
46 : : * (eDP/LVDS/DSI) panels to the front of the connector list, instead of
47 : : * painstakingly trying to initialize them in the right order.
48 : : */
49 : 0 : void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
50 : : {
51 : 0 : struct drm_connector *connector, *tmp;
52 : 0 : struct list_head panel_list;
53 : :
54 : 0 : INIT_LIST_HEAD(&panel_list);
55 : :
56 : 0 : spin_lock_irq(&dev->mode_config.connector_list_lock);
57 [ # # ]: 0 : list_for_each_entry_safe(connector, tmp,
58 : : &dev->mode_config.connector_list, head) {
59 [ # # ]: 0 : if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
60 [ # # ]: 0 : connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
61 : : connector->connector_type == DRM_MODE_CONNECTOR_DSI)
62 : 0 : list_move_tail(&connector->head, &panel_list);
63 : : }
64 : :
65 [ # # ]: 0 : list_splice(&panel_list, &dev->mode_config.connector_list);
66 : 0 : spin_unlock_irq(&dev->mode_config.connector_list_lock);
67 : 0 : }
68 : : EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
69 : :
70 : : /**
71 : : * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
72 : : * @dev: DRM device
73 : : * @fb: drm_framebuffer object to fill out
74 : : * @mode_cmd: metadata from the userspace fb creation request
75 : : *
76 : : * This helper can be used in a drivers fb_create callback to pre-fill the fb's
77 : : * metadata fields.
78 : : */
79 : 0 : void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
80 : : struct drm_framebuffer *fb,
81 : : const struct drm_mode_fb_cmd2 *mode_cmd)
82 : : {
83 : 0 : int i;
84 : :
85 : 0 : fb->dev = dev;
86 : 0 : fb->format = drm_get_format_info(dev, mode_cmd);
87 : 0 : fb->width = mode_cmd->width;
88 : 0 : fb->height = mode_cmd->height;
89 [ # # ]: 0 : for (i = 0; i < 4; i++) {
90 : 0 : fb->pitches[i] = mode_cmd->pitches[i];
91 : 0 : fb->offsets[i] = mode_cmd->offsets[i];
92 : : }
93 : 0 : fb->modifier = mode_cmd->modifier[0];
94 : 0 : fb->flags = mode_cmd->flags;
95 : 0 : }
96 : : EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
97 : :
98 : : /*
99 : : * This is the minimal list of formats that seem to be safe for modeset use
100 : : * with all current DRM drivers. Most hardware can actually support more
101 : : * formats than this and drivers may specify a more accurate list when
102 : : * creating the primary plane. However drivers that still call
103 : : * drm_plane_init() will use this minimal format list as the default.
104 : : */
105 : : static const uint32_t safe_modeset_formats[] = {
106 : : DRM_FORMAT_XRGB8888,
107 : : DRM_FORMAT_ARGB8888,
108 : : };
109 : :
110 : 0 : static struct drm_plane *create_primary_plane(struct drm_device *dev)
111 : : {
112 : 0 : struct drm_plane *primary;
113 : 0 : int ret;
114 : :
115 : 0 : primary = kzalloc(sizeof(*primary), GFP_KERNEL);
116 [ # # ]: 0 : if (primary == NULL) {
117 : 0 : DRM_DEBUG_KMS("Failed to allocate primary plane\n");
118 : 0 : return NULL;
119 : : }
120 : :
121 : : /*
122 : : * Remove the format_default field from drm_plane when dropping
123 : : * this helper.
124 : : */
125 : 0 : primary->format_default = true;
126 : :
127 : : /* possible_crtc's will be filled in later by crtc_init */
128 : 0 : ret = drm_universal_plane_init(dev, primary, 0,
129 : : &drm_primary_helper_funcs,
130 : : safe_modeset_formats,
131 : : ARRAY_SIZE(safe_modeset_formats),
132 : : NULL,
133 : : DRM_PLANE_TYPE_PRIMARY, NULL);
134 [ # # ]: 0 : if (ret) {
135 : 0 : kfree(primary);
136 : 0 : primary = NULL;
137 : : }
138 : :
139 : : return primary;
140 : : }
141 : :
142 : : /**
143 : : * drm_crtc_init - Legacy CRTC initialization function
144 : : * @dev: DRM device
145 : : * @crtc: CRTC object to init
146 : : * @funcs: callbacks for the new CRTC
147 : : *
148 : : * Initialize a CRTC object with a default helper-provided primary plane and no
149 : : * cursor plane.
150 : : *
151 : : * Note that we make some assumptions about hardware limitations that may not be
152 : : * true for all hardware:
153 : : *
154 : : * 1. Primary plane cannot be repositioned.
155 : : * 2. Primary plane cannot be scaled.
156 : : * 3. Primary plane must cover the entire CRTC.
157 : : * 4. Subpixel positioning is not supported.
158 : : * 5. The primary plane must always be on if the CRTC is enabled.
159 : : *
160 : : * This is purely a backwards compatibility helper for old drivers. Drivers
161 : : * should instead implement their own primary plane. Atomic drivers must do so.
162 : : * Drivers with the above hardware restriction can look into using &struct
163 : : * drm_simple_display_pipe, which encapsulates the above limitations into a nice
164 : : * interface.
165 : : *
166 : : * Returns:
167 : : * Zero on success, error code on failure.
168 : : */
169 : 0 : int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
170 : : const struct drm_crtc_funcs *funcs)
171 : : {
172 : 0 : struct drm_plane *primary;
173 : :
174 : 0 : primary = create_primary_plane(dev);
175 : 0 : return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
176 : : NULL);
177 : : }
178 : : EXPORT_SYMBOL(drm_crtc_init);
179 : :
180 : : /**
181 : : * drm_mode_config_helper_suspend - Modeset suspend helper
182 : : * @dev: DRM device
183 : : *
184 : : * This helper function takes care of suspending the modeset side. It disables
185 : : * output polling if initialized, suspends fbdev if used and finally calls
186 : : * drm_atomic_helper_suspend().
187 : : * If suspending fails, fbdev and polling is re-enabled.
188 : : *
189 : : * Returns:
190 : : * Zero on success, negative error code on error.
191 : : *
192 : : * See also:
193 : : * drm_kms_helper_poll_disable() and drm_fb_helper_set_suspend_unlocked().
194 : : */
195 : 0 : int drm_mode_config_helper_suspend(struct drm_device *dev)
196 : : {
197 : 0 : struct drm_atomic_state *state;
198 : :
199 [ # # ]: 0 : if (!dev)
200 : : return 0;
201 : :
202 : 0 : drm_kms_helper_poll_disable(dev);
203 : 0 : drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 1);
204 : 0 : state = drm_atomic_helper_suspend(dev);
205 [ # # ]: 0 : if (IS_ERR(state)) {
206 : 0 : drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
207 : 0 : drm_kms_helper_poll_enable(dev);
208 : 0 : return PTR_ERR(state);
209 : : }
210 : :
211 : 0 : dev->mode_config.suspend_state = state;
212 : :
213 : 0 : return 0;
214 : : }
215 : : EXPORT_SYMBOL(drm_mode_config_helper_suspend);
216 : :
217 : : /**
218 : : * drm_mode_config_helper_resume - Modeset resume helper
219 : : * @dev: DRM device
220 : : *
221 : : * This helper function takes care of resuming the modeset side. It calls
222 : : * drm_atomic_helper_resume(), resumes fbdev if used and enables output polling
223 : : * if initiaized.
224 : : *
225 : : * Returns:
226 : : * Zero on success, negative error code on error.
227 : : *
228 : : * See also:
229 : : * drm_fb_helper_set_suspend_unlocked() and drm_kms_helper_poll_enable().
230 : : */
231 : 0 : int drm_mode_config_helper_resume(struct drm_device *dev)
232 : : {
233 : 0 : int ret;
234 : :
235 [ # # ]: 0 : if (!dev)
236 : : return 0;
237 : :
238 [ # # # # ]: 0 : if (WARN_ON(!dev->mode_config.suspend_state))
239 : : return -EINVAL;
240 : :
241 : 0 : ret = drm_atomic_helper_resume(dev, dev->mode_config.suspend_state);
242 [ # # ]: 0 : if (ret)
243 : 0 : DRM_ERROR("Failed to resume (%d)\n", ret);
244 : 0 : dev->mode_config.suspend_state = NULL;
245 : :
246 : 0 : drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
247 : 0 : drm_kms_helper_poll_enable(dev);
248 : :
249 : 0 : return ret;
250 : : }
251 : : EXPORT_SYMBOL(drm_mode_config_helper_resume);
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