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) 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         list_for_each_entry_safe(connector, tmp,
  52                                  &dev->mode_config.connector_list, head) {
  53                 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
  54                     connector->connector_type == DRM_MODE_CONNECTOR_eDP)
  55                         list_move_tail(&connector->head, &panel_list);
  56         }
  57
  58         list_splice(&panel_list, &dev->mode_config.connector_list);
  59 }
  60 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
  61
  62 /**
  63  * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
  64  * @fb: drm_framebuffer object to fill out
  65  * @mode_cmd: metadata from the userspace fb creation request
  66  *
  67  * This helper can be used in a drivers fb_create callback to pre-fill the fb's
  68  * metadata fields.
  69  */
  70 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
  71                                     const struct drm_mode_fb_cmd2 *mode_cmd)
  72 {
  73         int i;
  74
  75         fb->width = mode_cmd->width;
  76         fb->height = mode_cmd->height;
  77         for (i = 0; i < 4; i++) {
  78                 fb->pitches[i] = mode_cmd->pitches[i];
  79                 fb->offsets[i] = mode_cmd->offsets[i];
  80                 fb->modifier[i] = mode_cmd->modifier[i];
  81         }
  82         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
  83                                     &fb->bits_per_pixel);
  84         fb->pixel_format = mode_cmd->pixel_format;
  85         fb->flags = mode_cmd->flags;
  86 }
  87 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
  88
  89 /*
  90  * This is the minimal list of formats that seem to be safe for modeset use
  91  * with all current DRM drivers.  Most hardware can actually support more
  92  * formats than this and drivers may specify a more accurate list when
  93  * creating the primary plane.  However drivers that still call
  94  * drm_plane_init() will use this minimal format list as the default.
  95  */
  96 static const uint32_t safe_modeset_formats[] = {
  97         DRM_FORMAT_XRGB8888,
  98         DRM_FORMAT_ARGB8888,
  99 };
 100
 101 static struct drm_plane *create_primary_plane(struct drm_device *dev)
 102 {
 103         struct drm_plane *primary;
 104         int ret;
 105
 106         primary = kzalloc(sizeof(*primary), GFP_KERNEL);
 107         if (primary == NULL) {
 108                 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
 109                 return NULL;
 110         }
 111
 112         /*
 113          * Remove the format_default field from drm_plane when dropping
 114          * this helper.
 115          */
 116         primary->format_default = true;
 117
 118         /* possible_crtc's will be filled in later by crtc_init */
 119         ret = drm_universal_plane_init(dev, primary, 0,
 120                                        &drm_primary_helper_funcs,
 121                                        safe_modeset_formats,
 122                                        ARRAY_SIZE(safe_modeset_formats),
 123                                        DRM_PLANE_TYPE_PRIMARY, NULL);
 124         if (ret) {
 125                 kfree(primary);
 126                 primary = NULL;
 127         }
 128
 129         return primary;
 130 }
 131
 132 /**
 133  * drm_crtc_init - Legacy CRTC initialization function
 134  * @dev: DRM device
 135  * @crtc: CRTC object to init
 136  * @funcs: callbacks for the new CRTC
 137  *
 138  * Initialize a CRTC object with a default helper-provided primary plane and no
 139  * cursor plane.
 140  *
 141  * Returns:
 142  * Zero on success, error code on failure.
 143  */
 144 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 145                   const struct drm_crtc_funcs *funcs)
 146 {
 147         struct drm_plane *primary;
 148
 149         primary = create_primary_plane(dev);
 150         return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
 151                                          NULL);
 152 }
 153 EXPORT_SYMBOL(drm_crtc_init);