drivers/gpu/drm/drm_modeset_helper.c

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