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