1 /* 2 * Copyright (c) 2006-2009 Red Hat Inc. 3 * Copyright (c) 2006-2008 Intel Corporation 4 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> 5 * 6 * DRM framebuffer helper functions 7 * 8 * Permission to use, copy, modify, distribute, and sell this software and its 9 * documentation for any purpose is hereby granted without fee, provided that 10 * the above copyright notice appear in all copies and that both that copyright 11 * notice and this permission notice appear in supporting documentation, and 12 * that the name of the copyright holders not be used in advertising or 13 * publicity pertaining to distribution of the software without specific, 14 * written prior permission. The copyright holders make no representations 15 * about the suitability of this software for any purpose. It is provided "as 16 * is" without express or implied warranty. 17 * 18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 * 26 * Authors: 27 * Dave Airlie <airlied@linux.ie> 28 * Jesse Barnes <jesse.barnes@intel.com> 29 */ 30 #ifndef DRM_FB_HELPER_H 31 #define DRM_FB_HELPER_H 32 33 struct drm_fb_helper; 34 35 36 enum mode_set_atomic { 37 LEAVE_ATOMIC_MODE_SET, 38 ENTER_ATOMIC_MODE_SET, 39 }; 40 41 struct drm_fb_offset { 42 int x, y; 43 }; 44 45 struct drm_fb_helper_crtc { 46 struct drm_mode_set mode_set; 47 struct drm_display_mode *desired_mode; 48 int x, y; 49 }; 50 51 /** 52 * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size 53 * @fb_width: fbdev width 54 * @fb_height: fbdev height 55 * @surface_width: scanout buffer width 56 * @surface_height: scanout buffer height 57 * @surface_bpp: scanout buffer bpp 58 * @surface_depth: scanout buffer depth 59 * 60 * Note that the scanout surface width/height may be larger than the fbdev 61 * width/height. In case of multiple displays, the scanout surface is sized 62 * according to the largest width/height (so it is large enough for all CRTCs 63 * to scanout). But the fbdev width/height is sized to the minimum width/ 64 * height of all the displays. This ensures that fbcon fits on the smallest 65 * of the attached displays. 66 * 67 * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height, 68 * rather than the surface size. 69 */ 70 struct drm_fb_helper_surface_size { 71 u32 fb_width; 72 u32 fb_height; 73 u32 surface_width; 74 u32 surface_height; 75 u32 surface_bpp; 76 u32 surface_depth; 77 }; 78 79 /** 80 * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library 81 * 82 * Driver callbacks used by the fbdev emulation helper library. 83 */ 84 struct drm_fb_helper_funcs { 85 /** 86 * @gamma_set: 87 * 88 * Set the given gamma LUT register on the given CRTC. 89 * 90 * This callback is optional. 91 * 92 * FIXME: 93 * 94 * This callback is functionally redundant with the core gamma table 95 * support and simply exists because the fbdev hasn't yet been 96 * refactored to use the core gamma table interfaces. 97 */ 98 void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green, 99 u16 blue, int regno); 100 /** 101 * @gamma_get: 102 * 103 * Read the given gamma LUT register on the given CRTC, used to save the 104 * current LUT when force-restoring the fbdev for e.g. kdbg. 105 * 106 * This callback is optional. 107 * 108 * FIXME: 109 * 110 * This callback is functionally redundant with the core gamma table 111 * support and simply exists because the fbdev hasn't yet been 112 * refactored to use the core gamma table interfaces. 113 */ 114 void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green, 115 u16 *blue, int regno); 116 117 /** 118 * @fb_probe: 119 * 120 * Driver callback to allocate and initialize the fbdev info structure. 121 * Furthermore it also needs to allocate the DRM framebuffer used to 122 * back the fbdev. 123 * 124 * This callback is mandatory. 125 * 126 * RETURNS: 127 * 128 * The driver should return 0 on success and a negative error code on 129 * failure. 130 */ 131 int (*fb_probe)(struct drm_fb_helper *helper, 132 struct drm_fb_helper_surface_size *sizes); 133 134 /** 135 * @initial_config: 136 * 137 * Driver callback to setup an initial fbdev display configuration. 138 * Drivers can use this callback to tell the fbdev emulation what the 139 * preferred initial configuration is. This is useful to implement 140 * smooth booting where the fbdev (and subsequently all userspace) never 141 * changes the mode, but always inherits the existing configuration. 142 * 143 * This callback is optional. 144 * 145 * RETURNS: 146 * 147 * The driver should return true if a suitable initial configuration has 148 * been filled out and false when the fbdev helper should fall back to 149 * the default probing logic. 150 */ 151 bool (*initial_config)(struct drm_fb_helper *fb_helper, 152 struct drm_fb_helper_crtc **crtcs, 153 struct drm_display_mode **modes, 154 struct drm_fb_offset *offsets, 155 bool *enabled, int width, int height); 156 }; 157 158 struct drm_fb_helper_connector { 159 struct drm_connector *connector; 160 }; 161 162 /** 163 * struct drm_fb_helper - main structure to emulate fbdev on top of KMS 164 * @fb: Scanout framebuffer object 165 * @dev: DRM device 166 * @crtc_count: number of possible CRTCs 167 * @crtc_info: per-CRTC helper state (mode, x/y offset, etc) 168 * @connector_count: number of connected connectors 169 * @connector_info_alloc_count: size of connector_info 170 * @connector_info: array of per-connector information 171 * @funcs: driver callbacks for fb helper 172 * @fbdev: emulated fbdev device info struct 173 * @pseudo_palette: fake palette of 16 colors 174 * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to 175 * the screen buffer 176 * @dirty_lock: spinlock protecting @dirty_clip 177 * @dirty_work: worker used to flush the framebuffer 178 * 179 * This is the main structure used by the fbdev helpers. Drivers supporting 180 * fbdev emulation should embedded this into their overall driver structure. 181 * Drivers must also fill out a struct &drm_fb_helper_funcs with a few 182 * operations. 183 */ 184 struct drm_fb_helper { 185 struct drm_framebuffer *fb; 186 struct drm_device *dev; 187 int crtc_count; 188 struct drm_fb_helper_crtc *crtc_info; 189 int connector_count; 190 int connector_info_alloc_count; 191 struct drm_fb_helper_connector **connector_info; 192 const struct drm_fb_helper_funcs *funcs; 193 struct fb_info *fbdev; 194 u32 pseudo_palette[17]; 195 struct drm_clip_rect dirty_clip; 196 struct lock dirty_lock; 197 struct work_struct dirty_work; 198 199 /** 200 * @kernel_fb_list: 201 * 202 * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit. 203 */ 204 struct list_head kernel_fb_list; 205 206 /** 207 * @delayed_hotplug: 208 * 209 * A hotplug was received while fbdev wasn't in control of the DRM 210 * device, i.e. another KMS master was active. The output configuration 211 * needs to be reprobe when fbdev is in control again. 212 */ 213 bool delayed_hotplug; 214 215 /** 216 * @atomic: 217 * 218 * Use atomic updates for restore_fbdev_mode(), etc. This defaults to 219 * true if driver has DRIVER_ATOMIC feature flag, but drivers can 220 * override it to true after drm_fb_helper_init() if they support atomic 221 * modeset but do not yet advertise DRIVER_ATOMIC (note that fb-helper 222 * does not require ASYNC commits). 223 */ 224 bool atomic; 225 }; 226 227 #define CONFIG_DRM_FBDEV_EMULATION 1 228 #ifdef CONFIG_DRM_FBDEV_EMULATION 229 int drm_fb_helper_modinit(void); 230 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 231 const struct drm_fb_helper_funcs *funcs); 232 int drm_fb_helper_init(struct drm_device *dev, 233 struct drm_fb_helper *helper, int crtc_count, 234 int max_conn); 235 void drm_fb_helper_fini(struct drm_fb_helper *helper); 236 int drm_fb_helper_blank(int blank, struct fb_info *info); 237 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 238 struct fb_info *info); 239 int drm_fb_helper_set_par(struct fb_info *info); 240 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 241 struct fb_info *info); 242 243 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper); 244 245 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper); 246 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper); 247 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper); 248 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, 249 uint32_t fb_width, uint32_t fb_height); 250 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 251 uint32_t depth); 252 253 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); 254 255 void drm_fb_helper_deferred_io(struct fb_info *info, 256 struct list_head *pagelist); 257 258 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, 259 size_t count, loff_t *ppos); 260 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, 261 size_t count, loff_t *ppos); 262 263 void drm_fb_helper_sys_fillrect(struct fb_info *info, 264 const struct fb_fillrect *rect); 265 void drm_fb_helper_sys_copyarea(struct fb_info *info, 266 const struct fb_copyarea *area); 267 void drm_fb_helper_sys_imageblit(struct fb_info *info, 268 const struct fb_image *image); 269 270 void drm_fb_helper_cfb_fillrect(struct fb_info *info, 271 const struct fb_fillrect *rect); 272 void drm_fb_helper_cfb_copyarea(struct fb_info *info, 273 const struct fb_copyarea *area); 274 void drm_fb_helper_cfb_imageblit(struct fb_info *info, 275 const struct fb_image *image); 276 277 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state); 278 279 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info); 280 281 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper); 282 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel); 283 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper); 284 int drm_fb_helper_debug_enter(struct fb_info *info); 285 int drm_fb_helper_debug_leave(struct fb_info *info); 286 struct drm_display_mode * 287 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, 288 int width, int height); 289 struct drm_display_mode * 290 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 291 int width, int height); 292 293 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector); 294 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 295 struct drm_connector *connector); 296 #else 297 static inline int drm_fb_helper_modinit(void) 298 { 299 return 0; 300 } 301 302 static inline void drm_fb_helper_prepare(struct drm_device *dev, 303 struct drm_fb_helper *helper, 304 const struct drm_fb_helper_funcs *funcs) 305 { 306 } 307 308 static inline int drm_fb_helper_init(struct drm_device *dev, 309 struct drm_fb_helper *helper, int crtc_count, 310 int max_conn) 311 { 312 return 0; 313 } 314 315 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper) 316 { 317 } 318 319 static inline int drm_fb_helper_blank(int blank, struct fb_info *info) 320 { 321 return 0; 322 } 323 324 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 325 struct fb_info *info) 326 { 327 return 0; 328 } 329 330 static inline int drm_fb_helper_set_par(struct fb_info *info) 331 { 332 return 0; 333 } 334 335 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 336 struct fb_info *info) 337 { 338 return 0; 339 } 340 341 static inline int 342 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 343 { 344 return 0; 345 } 346 347 static inline struct fb_info * 348 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) 349 { 350 return NULL; 351 } 352 353 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) 354 { 355 } 356 static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) 357 { 358 } 359 360 static inline void drm_fb_helper_fill_var(struct fb_info *info, 361 struct drm_fb_helper *fb_helper, 362 uint32_t fb_width, uint32_t fb_height) 363 { 364 } 365 366 static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, 367 uint32_t depth) 368 { 369 } 370 371 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap, 372 struct fb_info *info) 373 { 374 return 0; 375 } 376 377 static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) 378 { 379 } 380 381 static inline void drm_fb_helper_deferred_io(struct fb_info *info, 382 struct list_head *pagelist) 383 { 384 } 385 386 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, 387 char __user *buf, size_t count, 388 loff_t *ppos) 389 { 390 return -ENODEV; 391 } 392 393 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info, 394 const char __user *buf, 395 size_t count, loff_t *ppos) 396 { 397 return -ENODEV; 398 } 399 400 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info, 401 const struct fb_fillrect *rect) 402 { 403 } 404 405 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info, 406 const struct fb_copyarea *area) 407 { 408 } 409 410 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info, 411 const struct fb_image *image) 412 { 413 } 414 415 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info, 416 const struct fb_fillrect *rect) 417 { 418 } 419 420 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info, 421 const struct fb_copyarea *area) 422 { 423 } 424 425 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info, 426 const struct fb_image *image) 427 { 428 } 429 430 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, 431 int state) 432 { 433 } 434 435 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 436 { 437 return 0; 438 } 439 440 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, 441 int bpp_sel) 442 { 443 return 0; 444 } 445 446 static inline int 447 drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) 448 { 449 return 0; 450 } 451 452 static inline int drm_fb_helper_debug_enter(struct fb_info *info) 453 { 454 return 0; 455 } 456 457 static inline int drm_fb_helper_debug_leave(struct fb_info *info) 458 { 459 return 0; 460 } 461 462 static inline struct drm_display_mode * 463 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, 464 int width, int height) 465 { 466 return NULL; 467 } 468 469 static inline struct drm_display_mode * 470 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, 471 int width, int height) 472 { 473 return NULL; 474 } 475 476 static inline int 477 drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, 478 struct drm_connector *connector) 479 { 480 return 0; 481 } 482 483 static inline int 484 drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, 485 struct drm_connector *connector) 486 { 487 return 0; 488 } 489 #endif 490 #endif 491