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_modeset_helper.h>
  24 #include <drm/drm_plane_helper.h>
  25
  26 /**
  27  * DOC: aux kms helpers
  28  *
  29  * This helper library contains various one-off functions which don't really fit
  30  * anywhere else in the DRM modeset helper library.
  31  */
  32
  33 /**
  34  * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
  35  *                                              connector list
  36  * @dev: drm device to operate on
  37  *
  38  * Some userspace presumes that the first connected connector is the main
  39  * display, where it's supposed to display e.g. the login screen. For
  40  * laptops, this should be the main panel. Use this function to sort all
  41  * (eDP/LVDS/DSI) panels to the front of the connector list, instead of
  42  * painstakingly trying to initialize them in the right order.
  43  */
  44 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
  45 {
  46         struct drm_connector *connector, *tmp;
  47         struct list_head panel_list;
  48
  49         INIT_LIST_HEAD(&panel_list);
  50
  51         spin_lock_irq(&dev->mode_config.connector_list_lock);
  52         list_for_each_entry_safe(connector, tmp,
  53                                  &dev->mode_config.connector_list, head) {
  54                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  55                     connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
  56                     connector->connector_type == DRM_MODE_CONNECTOR_DSI)
  57                         list_move_tail(&connector->head, &panel_list);
  58         }
  59
  60         list_splice(&panel_list, &dev->mode_config.connector_list);
  61         spin_unlock_irq(&dev->mode_config.connector_list_lock);
  62 }
  63 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  64
  65 /**
  66  * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
  67  * @dev: DRM device
  68  * @fb: drm_framebuffer object to fill out
  69  * @mode_cmd: metadata from the userspace fb creation request
  70  *
  71  * This helper can be used in a drivers fb_create callback to pre-fill the fb's
  72  * metadata fields.
  73  */
  74 void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
  75                                     struct drm_framebuffer *fb,
  76                                     const struct drm_mode_fb_cmd2 *mode_cmd)
  77 {
  78         int i;
  79
  80         fb->dev = dev;
  81         fb->format = drm_get_format_info(dev, mode_cmd);
  82         fb->width = mode_cmd->width;
  83         fb->height = mode_cmd->height;
  84         for (i = 0; i < 4; i++) {
  85                 fb->pitches[i] = mode_cmd->pitches[i];
  86                 fb->offsets[i] = mode_cmd->offsets[i];
  87         }
  88         fb->modifier = mode_cmd->modifier[0];
  89         fb->flags = mode_cmd->flags;
  90 }
  91 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
  92
  93 /*
  94  * This is the minimal list of formats that seem to be safe for modeset use
  95  * with all current DRM drivers.  Most hardware can actually support more
  96  * formats than this and drivers may specify a more accurate list when
  97  * creating the primary plane.  However drivers that still call
  98  * drm_plane_init() will use this minimal format list as the default.
  99  */
 100 static const uint32_t safe_modeset_formats[] = {
 101         DRM_FORMAT_XRGB8888,
 102         DRM_FORMAT_ARGB8888,
 103 };
 104
 105 static struct drm_plane *create_primary_plane(struct drm_device *dev)
 106 {
 107         struct drm_plane *primary;
 108         int ret;
 109
 110         primary = kzalloc(sizeof(*primary), GFP_KERNEL);
 111         if (primary == NULL) {
 112                 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
 113                 return NULL;
 114         }
 115
 116         /*
 117          * Remove the format_default field from drm_plane when dropping
 118          * this helper.
 119          */
 120         primary->format_default = true;
 121
 122         /* possible_crtc's will be filled in later by crtc_init */
 123         ret = drm_universal_plane_init(dev, primary, 0,
 124                                        &drm_primary_helper_funcs,
 125                                        safe_modeset_formats,
 126                                        ARRAY_SIZE(safe_modeset_formats),
 127                                        NULL,
 128                                        DRM_PLANE_TYPE_PRIMARY, NULL);
 129         if (ret) {
 130                 kfree(primary);
 131                 primary = NULL;
 132         }
 133
 134         return primary;
 135 }
 136
 137 /**
 138  * drm_crtc_init - Legacy CRTC initialization function
 139  * @dev: DRM device
 140  * @crtc: CRTC object to init
 141  * @funcs: callbacks for the new CRTC
 142  *
 143  * Initialize a CRTC object with a default helper-provided primary plane and no
 144  * cursor plane.
 145  *
 146  * Returns:
 147  * Zero on success, error code on failure.
 148  */
 149 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 150                   const struct drm_crtc_funcs *funcs)
 151 {
 152         struct drm_plane *primary;
 153
 154         primary = create_primary_plane(dev);
 155         return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
 156                                          NULL);
 157 }
 158 EXPORT_SYMBOL(drm_crtc_init);