2 * Copyright (c) 2016 Intel Corporation
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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>
32 * DOC: aux kms helpers
34 * This helper library contains various one-off functions which don't really fit
35 * anywhere else in the DRM modeset helper library.
39 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
41 * @dev: drm device to operate on
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.
49 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
51 struct drm_connector *connector, *tmp;
52 struct list_head panel_list;
54 INIT_LIST_HEAD(&panel_list);
56 spin_lock_irq(&dev->mode_config.connector_list_lock);
57 list_for_each_entry_safe(connector, tmp,
58 &dev->mode_config.connector_list, head) {
59 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
60 connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
61 connector->connector_type == DRM_MODE_CONNECTOR_DSI)
62 list_move_tail(&connector->head, &panel_list);
65 list_splice(&panel_list, &dev->mode_config.connector_list);
66 spin_unlock_irq(&dev->mode_config.connector_list_lock);
68 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
71 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
73 * @fb: drm_framebuffer object to fill out
74 * @mode_cmd: metadata from the userspace fb creation request
76 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
79 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)
86 fb->format = drm_get_format_info(dev, mode_cmd);
87 fb->width = mode_cmd->width;
88 fb->height = mode_cmd->height;
89 for (i = 0; i < 4; i++) {
90 fb->pitches[i] = mode_cmd->pitches[i];
91 fb->offsets[i] = mode_cmd->offsets[i];
93 fb->modifier = mode_cmd->modifier[0];
94 fb->flags = mode_cmd->flags;
96 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
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.
105 static const uint32_t safe_modeset_formats[] = {
110 static struct drm_plane *create_primary_plane(struct drm_device *dev)
112 struct drm_plane *primary;
115 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
116 if (primary == NULL) {
117 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
122 * Remove the format_default field from drm_plane when dropping
125 primary->format_default = true;
127 /* possible_crtc's will be filled in later by crtc_init */
128 ret = drm_universal_plane_init(dev, primary, 0,
129 &drm_primary_helper_funcs,
130 safe_modeset_formats,
131 ARRAY_SIZE(safe_modeset_formats),
133 DRM_PLANE_TYPE_PRIMARY, NULL);
143 * drm_crtc_init - Legacy CRTC initialization function
145 * @crtc: CRTC object to init
146 * @funcs: callbacks for the new CRTC
148 * Initialize a CRTC object with a default helper-provided primary plane and no
151 * Note that we make some assumptions about hardware limitations that may not be
152 * true for all hardware:
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.
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
167 * Zero on success, error code on failure.
169 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
170 const struct drm_crtc_funcs *funcs)
172 struct drm_plane *primary;
174 primary = create_primary_plane(dev);
175 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
178 EXPORT_SYMBOL(drm_crtc_init);
181 * drm_mode_config_helper_suspend - Modeset suspend helper
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.
190 * Zero on success, negative error code on error.
193 * drm_kms_helper_poll_disable() and drm_fb_helper_set_suspend_unlocked().
195 int drm_mode_config_helper_suspend(struct drm_device *dev)
197 struct drm_atomic_state *state;
202 drm_kms_helper_poll_disable(dev);
203 drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 1);
204 state = drm_atomic_helper_suspend(dev);
206 drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
207 drm_kms_helper_poll_enable(dev);
208 return PTR_ERR(state);
211 dev->mode_config.suspend_state = state;
215 EXPORT_SYMBOL(drm_mode_config_helper_suspend);
218 * drm_mode_config_helper_resume - Modeset resume helper
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
226 * Zero on success, negative error code on error.
229 * drm_fb_helper_set_suspend_unlocked() and drm_kms_helper_poll_enable().
231 int drm_mode_config_helper_resume(struct drm_device *dev)
238 if (WARN_ON(!dev->mode_config.suspend_state))
241 ret = drm_atomic_helper_resume(dev, dev->mode_config.suspend_state);
243 DRM_ERROR("Failed to resume (%d)\n", ret);
244 dev->mode_config.suspend_state = NULL;
246 drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
247 drm_kms_helper_poll_enable(dev);
251 EXPORT_SYMBOL(drm_mode_config_helper_resume);