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); 154