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); 159