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 <linux/export.h>
24
25#include <drm/drm_atomic_helper.h>
26#include <drm/drm_client_event.h>
27#include <drm/drm_fourcc.h>
28#include <drm/drm_framebuffer.h>
29#include <drm/drm_modeset_helper.h>
30#include <drm/drm_plane_helper.h>
31#include <drm/drm_print.h>
32#include <drm/drm_probe_helper.h>
33
34/**
35 * DOC: aux kms helpers
36 *
37 * This helper library contains various one-off functions which don't really fit
38 * anywhere else in the DRM modeset helper library.
39 */
40
41/**
42 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
43 * connector list
44 * @dev: drm device to operate on
45 *
46 * Some userspace presumes that the first connected connector is the main
47 * display, where it's supposed to display e.g. the login screen. For
48 * laptops, this should be the main panel. Use this function to sort all
49 * (eDP/LVDS/DSI) panels to the front of the connector list, instead of
50 * painstakingly trying to initialize them in the right order.
51 */
52void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
53{
54 struct drm_connector *connector, *tmp;
55 struct list_head panel_list;
56
57 INIT_LIST_HEAD(list: &panel_list);
58
59 spin_lock_irq(lock: &dev->mode_config.connector_list_lock);
60 list_for_each_entry_safe(connector, tmp,
61 &dev->mode_config.connector_list, head) {
62 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
63 connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
64 connector->connector_type == DRM_MODE_CONNECTOR_DSI)
65 list_move_tail(list: &connector->head, head: &panel_list);
66 }
67
68 list_splice(list: &panel_list, head: &dev->mode_config.connector_list);
69 spin_unlock_irq(lock: &dev->mode_config.connector_list_lock);
70}
71EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
72
73/**
74 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
75 * @dev: DRM device
76 * @fb: drm_framebuffer object to fill out
77 * @info: pixel format information
78 * @mode_cmd: metadata from the userspace fb creation request
79 *
80 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
81 * metadata fields.
82 */
83void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
84 struct drm_framebuffer *fb,
85 const struct drm_format_info *info,
86 const struct drm_mode_fb_cmd2 *mode_cmd)
87{
88 int i;
89
90 fb->dev = dev;
91 fb->format = info;
92 fb->width = mode_cmd->width;
93 fb->height = mode_cmd->height;
94 for (i = 0; i < 4; i++) {
95 fb->pitches[i] = mode_cmd->pitches[i];
96 fb->offsets[i] = mode_cmd->offsets[i];
97 }
98 fb->modifier = mode_cmd->modifier[0];
99 fb->flags = mode_cmd->flags;
100}
101EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
102
103/*
104 * This is the minimal list of formats that seem to be safe for modeset use
105 * with all current DRM drivers. Most hardware can actually support more
106 * formats than this and drivers may specify a more accurate list when
107 * creating the primary plane.
108 */
109static const uint32_t safe_modeset_formats[] = {
110 DRM_FORMAT_XRGB8888,
111 DRM_FORMAT_ARGB8888,
112};
113
114static const struct drm_plane_funcs primary_plane_funcs = {
115 DRM_PLANE_NON_ATOMIC_FUNCS,
116};
117
118/**
119 * drm_crtc_init - Legacy CRTC initialization function
120 * @dev: DRM device
121 * @crtc: CRTC object to init
122 * @funcs: callbacks for the new CRTC
123 *
124 * Initialize a CRTC object with a default helper-provided primary plane and no
125 * cursor plane.
126 *
127 * Note that we make some assumptions about hardware limitations that may not be
128 * true for all hardware:
129 *
130 * 1. Primary plane cannot be repositioned.
131 * 2. Primary plane cannot be scaled.
132 * 3. Primary plane must cover the entire CRTC.
133 * 4. Subpixel positioning is not supported.
134 * 5. The primary plane must always be on if the CRTC is enabled.
135 *
136 * This is purely a backwards compatibility helper for old drivers. Drivers
137 * should instead implement their own primary plane. Atomic drivers must do so.
138 * Drivers with the above hardware restriction can look into using &struct
139 * drm_simple_display_pipe, which encapsulates the above limitations into a nice
140 * interface.
141 *
142 * Returns:
143 * Zero on success, error code on failure.
144 */
145int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
146 const struct drm_crtc_funcs *funcs)
147{
148 struct drm_plane *primary;
149 int ret;
150
151 /* possible_crtc's will be filled in later by crtc_init */
152 primary = __drm_universal_plane_alloc(dev, size: sizeof(*primary), offset: 0, possible_crtcs: 0,
153 funcs: &primary_plane_funcs,
154 formats: safe_modeset_formats,
155 ARRAY_SIZE(safe_modeset_formats),
156 NULL, plane_type: DRM_PLANE_TYPE_PRIMARY, NULL);
157 if (IS_ERR(ptr: primary))
158 return PTR_ERR(ptr: primary);
159
160 /*
161 * Remove the format_default field from drm_plane when dropping
162 * this helper.
163 */
164 primary->format_default = true;
165
166 ret = drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs, NULL);
167 if (ret)
168 goto err_drm_plane_cleanup;
169
170 return 0;
171
172err_drm_plane_cleanup:
173 drm_plane_cleanup(plane: primary);
174 kfree(objp: primary);
175 return ret;
176}
177EXPORT_SYMBOL(drm_crtc_init);
178
179/**
180 * drm_mode_config_helper_suspend - Modeset suspend helper
181 * @dev: DRM device
182 *
183 * This helper function takes care of suspending the modeset side. It disables
184 * output polling if initialized, suspends fbdev if used and finally calls
185 * drm_atomic_helper_suspend().
186 * If suspending fails, fbdev and polling is re-enabled.
187 *
188 * Returns:
189 * Zero on success, negative error code on error.
190 *
191 * See also:
192 * drm_kms_helper_poll_disable() and drm_client_dev_suspend().
193 */
194int drm_mode_config_helper_suspend(struct drm_device *dev)
195{
196 struct drm_atomic_state *state;
197
198 if (!dev)
199 return 0;
200 /*
201 * Don't disable polling if it was never initialized
202 */
203 if (dev->mode_config.poll_enabled)
204 drm_kms_helper_poll_disable(dev);
205
206 drm_client_dev_suspend(dev);
207 state = drm_atomic_helper_suspend(dev);
208 if (IS_ERR(ptr: state)) {
209 drm_client_dev_resume(dev);
210
211 /*
212 * Don't enable polling if it was never initialized
213 */
214 if (dev->mode_config.poll_enabled)
215 drm_kms_helper_poll_enable(dev);
216
217 return PTR_ERR(ptr: state);
218 }
219
220 dev->mode_config.suspend_state = state;
221
222 return 0;
223}
224EXPORT_SYMBOL(drm_mode_config_helper_suspend);
225
226/**
227 * drm_mode_config_helper_resume - Modeset resume helper
228 * @dev: DRM device
229 *
230 * This helper function takes care of resuming the modeset side. It calls
231 * drm_atomic_helper_resume(), resumes fbdev if used and enables output polling
232 * if initiaized.
233 *
234 * Returns:
235 * Zero on success, negative error code on error.
236 *
237 * See also:
238 * drm_client_dev_resume() and drm_kms_helper_poll_enable().
239 */
240int drm_mode_config_helper_resume(struct drm_device *dev)
241{
242 int ret;
243
244 if (!dev)
245 return 0;
246
247 if (WARN_ON(!dev->mode_config.suspend_state))
248 return -EINVAL;
249
250 ret = drm_atomic_helper_resume(dev, state: dev->mode_config.suspend_state);
251 if (ret)
252 DRM_ERROR("Failed to resume (%d)\n", ret);
253 dev->mode_config.suspend_state = NULL;
254
255 drm_client_dev_resume(dev);
256
257 /*
258 * Don't enable polling if it is not initialized
259 */
260 if (dev->mode_config.poll_enabled)
261 drm_kms_helper_poll_enable(dev);
262
263 return ret;
264}
265EXPORT_SYMBOL(drm_mode_config_helper_resume);
266

source code of linux/drivers/gpu/drm/drm_modeset_helper.c