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