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 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 connector->connector_type == DRM_MODE_CONNECTOR_DSI) 56 list_move_tail(&connector->head, &panel_list); 57 } 58 59 list_splice(&panel_list, &dev->mode_config.connector_list); 60 } 61 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 62 63 /** 64 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata 65 * @fb: drm_framebuffer object to fill out 66 * @mode_cmd: metadata from the userspace fb creation request 67 * 68 * This helper can be used in a drivers fb_create callback to pre-fill the fb's 69 * metadata fields. 70 */ 71 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, 72 const struct drm_mode_fb_cmd2 *mode_cmd) 73 { 74 const struct drm_format_info *info; 75 int i; 76 77 info = drm_format_info(mode_cmd->pixel_format); 78 if (!info || !info->depth) { 79 struct drm_format_name_buf format_name; 80 81 DRM_DEBUG_KMS("non-RGB pixel format %s\n", 82 drm_get_format_name(mode_cmd->pixel_format, 83 &format_name)); 84 85 fb->depth = 0; 86 fb->bits_per_pixel = 0; 87 } else { 88 fb->depth = info->depth; 89 fb->bits_per_pixel = info->cpp[0] * 8; 90 } 91 92 fb->width = mode_cmd->width; 93 fb->height = mode_cmd->height; 94 for (i = 0; i < 4; i++) { 95 fb->pitches[i] = mode_cmd->pitches[i]; 96 fb->offsets[i] = mode_cmd->offsets[i]; 97 } 98 fb->modifier = mode_cmd->modifier[0]; 99 fb->pixel_format = mode_cmd->pixel_format; 100 fb->flags = mode_cmd->flags; 101 } 102 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); 103 104 /* 105 * This is the minimal list of formats that seem to be safe for modeset use 106 * with all current DRM drivers. Most hardware can actually support more 107 * formats than this and drivers may specify a more accurate list when 108 * creating the primary plane. However drivers that still call 109 * drm_plane_init() will use this minimal format list as the default. 110 */ 111 static const uint32_t safe_modeset_formats[] = { 112 DRM_FORMAT_XRGB8888, 113 DRM_FORMAT_ARGB8888, 114 }; 115 116 static struct drm_plane *create_primary_plane(struct drm_device *dev) 117 { 118 struct drm_plane *primary; 119 int ret; 120 121 primary = kzalloc(sizeof(*primary), GFP_KERNEL); 122 if (primary == NULL) { 123 DRM_DEBUG_KMS("Failed to allocate primary plane\n"); 124 return NULL; 125 } 126 127 /* 128 * Remove the format_default field from drm_plane when dropping 129 * this helper. 130 */ 131 primary->format_default = true; 132 133 /* possible_crtc's will be filled in later by crtc_init */ 134 ret = drm_universal_plane_init(dev, primary, 0, 135 &drm_primary_helper_funcs, 136 safe_modeset_formats, 137 ARRAY_SIZE(safe_modeset_formats), 138 DRM_PLANE_TYPE_PRIMARY, NULL); 139 if (ret) { 140 kfree(primary); 141 primary = NULL; 142 } 143 144 return primary; 145 } 146 147 /** 148 * drm_crtc_init - Legacy CRTC initialization function 149 * @dev: DRM device 150 * @crtc: CRTC object to init 151 * @funcs: callbacks for the new CRTC 152 * 153 * Initialize a CRTC object with a default helper-provided primary plane and no 154 * cursor plane. 155 * 156 * Returns: 157 * Zero on success, error code on failure. 158 */ 159 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, 160 const struct drm_crtc_funcs *funcs) 161 { 162 struct drm_plane *primary; 163 164 primary = create_primary_plane(dev); 165 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs, 166 NULL); 167 } 168 EXPORT_SYMBOL(drm_crtc_init); 169