include/drm/drm_fb_helper.h

   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 #include <drm/drm_crtc.h>
  36 #include <linux/kgdb.h>
  37
  38 enum mode_set_atomic {
  39         LEAVE_ATOMIC_MODE_SET,
  40         ENTER_ATOMIC_MODE_SET,
  41 };
  42
  43 struct drm_fb_offset {
  44         int x, y;
  45 };
  46
  47 struct drm_fb_helper_crtc {
  48         struct drm_mode_set mode_set;
  49         struct drm_display_mode *desired_mode;
  50         int x, y;
  51 };
  52
  53 /**
  54  * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
  55  * @fb_width: fbdev width
  56  * @fb_height: fbdev height
  57  * @surface_width: scanout buffer width
  58  * @surface_height: scanout buffer height
  59  * @surface_bpp: scanout buffer bpp
  60  * @surface_depth: scanout buffer depth
  61  *
  62  * Note that the scanout surface width/height may be larger than the fbdev
  63  * width/height.  In case of multiple displays, the scanout surface is sized
  64  * according to the largest width/height (so it is large enough for all CRTCs
  65  * to scanout).  But the fbdev width/height is sized to the minimum width/
  66  * height of all the displays.  This ensures that fbcon fits on the smallest
  67  * of the attached displays.
  68  *
  69  * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
  70  * rather than the surface size.
  71  */
  72 struct drm_fb_helper_surface_size {
  73         u32 fb_width;
  74         u32 fb_height;
  75         u32 surface_width;
  76         u32 surface_height;
  77         u32 surface_bpp;
  78         u32 surface_depth;
  79 };
  80
  81 /**
  82  * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
  83  *
  84  * Driver callbacks used by the fbdev emulation helper library.
  85  */
  86 struct drm_fb_helper_funcs {
  87         /**
  88          * @gamma_set:
  89          *
  90          * Set the given gamma LUT register on the given CRTC.
  91          *
  92          * This callback is optional.
  93          *
  94          * FIXME:
  95          *
  96          * This callback is functionally redundant with the core gamma table
  97          * support and simply exists because the fbdev hasn't yet been
  98          * refactored to use the core gamma table interfaces.
  99          */
 100         void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green,
 101                           u16 blue, int regno);
 102         /**
 103          * @gamma_get:
 104          *
 105          * Read the given gamma LUT register on the given CRTC, used to save the
 106          * current LUT when force-restoring the fbdev for e.g. kdbg.
 107          *
 108          * This callback is optional.
 109          *
 110          * FIXME:
 111          *
 112          * This callback is functionally redundant with the core gamma table
 113          * support and simply exists because the fbdev hasn't yet been
 114          * refactored to use the core gamma table interfaces.
 115          */
 116         void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green,
 117                           u16 *blue, int regno);
 118
 119         /**
 120          * @fb_probe:
 121          *
 122          * Driver callback to allocate and initialize the fbdev info structure.
 123          * Furthermore it also needs to allocate the DRM framebuffer used to
 124          * back the fbdev.
 125          *
 126          * This callback is mandatory.
 127          *
 128          * RETURNS:
 129          *
 130          * The driver should return 0 on success and a negative error code on
 131          * failure.
 132          */
 133         int (*fb_probe)(struct drm_fb_helper *helper,
 134                         struct drm_fb_helper_surface_size *sizes);
 135
 136         /**
 137          * @initial_config:
 138          *
 139          * Driver callback to setup an initial fbdev display configuration.
 140          * Drivers can use this callback to tell the fbdev emulation what the
 141          * preferred initial configuration is. This is useful to implement
 142          * smooth booting where the fbdev (and subsequently all userspace) never
 143          * changes the mode, but always inherits the existing configuration.
 144          *
 145          * This callback is optional.
 146          *
 147          * RETURNS:
 148          *
 149          * The driver should return true if a suitable initial configuration has
 150          * been filled out and false when the fbdev helper should fall back to
 151          * the default probing logic.
 152          */
 153         bool (*initial_config)(struct drm_fb_helper *fb_helper,
 154                                struct drm_fb_helper_crtc **crtcs,
 155                                struct drm_display_mode **modes,
 156                                struct drm_fb_offset *offsets,
 157                                bool *enabled, int width, int height);
 158 };
 159
 160 struct drm_fb_helper_connector {
 161         struct drm_connector *connector;
 162 };
 163
 164 /**
 165  * struct drm_fb_helper - main structure to emulate fbdev on top of KMS
 166  * @fb: Scanout framebuffer object
 167  * @dev: DRM device
 168  * @crtc_count: number of possible CRTCs
 169  * @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
 170  * @connector_count: number of connected connectors
 171  * @connector_info_alloc_count: size of connector_info
 172  * @connector_info: array of per-connector information
 173  * @funcs: driver callbacks for fb helper
 174  * @fbdev: emulated fbdev device info struct
 175  * @pseudo_palette: fake palette of 16 colors
 176  * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to
 177  *              the screen buffer
 178  * @dirty_lock: spinlock protecting @dirty_clip
 179  * @dirty_work: worker used to flush the framebuffer
 180  * @resume_work: worker used during resume if the console lock is already taken
 181  *
 182  * This is the main structure used by the fbdev helpers. Drivers supporting
 183  * fbdev emulation should embedded this into their overall driver structure.
 184  * Drivers must also fill out a &struct drm_fb_helper_funcs with a few
 185  * operations.
 186  */
 187 struct drm_fb_helper {
 188         struct drm_framebuffer *fb;
 189         struct drm_device *dev;
 190         int crtc_count;
 191         struct drm_fb_helper_crtc *crtc_info;
 192         int connector_count;
 193         int connector_info_alloc_count;
 194         struct drm_fb_helper_connector **connector_info;
 195         const struct drm_fb_helper_funcs *funcs;
 196         struct fb_info *fbdev;
 197         u32 pseudo_palette[17];
 198         struct drm_clip_rect dirty_clip;
 199         spinlock_t dirty_lock;
 200         struct work_struct dirty_work;
 201         struct work_struct resume_work;
 202
 203         /**
 204          * @kernel_fb_list:
 205          *
 206          * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
 207          */
 208         struct list_head kernel_fb_list;
 209
 210         /**
 211          * @delayed_hotplug:
 212          *
 213          * A hotplug was received while fbdev wasn't in control of the DRM
 214          * device, i.e. another KMS master was active. The output configuration
 215          * needs to be reprobe when fbdev is in control again.
 216          */
 217         bool delayed_hotplug;
 218 };
 219
 220 /**
 221  * define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers
 222  *
 223  * Helper define to register default implementations of drm_fb_helper
 224  * functions. To be used in struct fb_ops of drm drivers.
 225  */
 226 #define DRM_FB_HELPER_DEFAULT_OPS \
 227         .fb_check_var   = drm_fb_helper_check_var, \
 228         .fb_set_par     = drm_fb_helper_set_par, \
 229         .fb_setcmap     = drm_fb_helper_setcmap, \
 230         .fb_blank       = drm_fb_helper_blank, \
 231         .fb_pan_display = drm_fb_helper_pan_display, \
 232         .fb_debug_enter = drm_fb_helper_debug_enter, \
 233         .fb_debug_leave = drm_fb_helper_debug_leave, \
 234         .fb_ioctl       = drm_fb_helper_ioctl
 235
 236 #ifdef CONFIG_DRM_FBDEV_EMULATION
 237 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 238                            const struct drm_fb_helper_funcs *funcs);
 239 int drm_fb_helper_init(struct drm_device *dev,
 240                        struct drm_fb_helper *helper, int max_conn);
 241 void drm_fb_helper_fini(struct drm_fb_helper *helper);
 242 int drm_fb_helper_blank(int blank, struct fb_info *info);
 243 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 244                               struct fb_info *info);
 245 int drm_fb_helper_set_par(struct fb_info *info);
 246 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 247                             struct fb_info *info);
 248
 249 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
 250
 251 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
 252 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
 253 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 254                             uint32_t fb_width, uint32_t fb_height);
 255 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 256                             uint32_t depth);
 257
 258 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
 259
 260 void drm_fb_helper_deferred_io(struct fb_info *info,
 261                                struct list_head *pagelist);
 262
 263 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 264                                size_t count, loff_t *ppos);
 265 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 266                                 size_t count, loff_t *ppos);
 267
 268 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 269                                 const struct fb_fillrect *rect);
 270 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 271                                 const struct fb_copyarea *area);
 272 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 273                                  const struct fb_image *image);
 274
 275 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 276                                 const struct fb_fillrect *rect);
 277 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 278                                 const struct fb_copyarea *area);
 279 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 280                                  const struct fb_image *image);
 281
 282 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend);
 283 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
 284                                         bool suspend);
 285
 286 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 287
 288 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 289                         unsigned long arg);
 290
 291 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
 292 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 293 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
 294 int drm_fb_helper_debug_enter(struct fb_info *info);
 295 int drm_fb_helper_debug_leave(struct fb_info *info);
 296 struct drm_display_mode *
 297 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 298                         int width, int height);
 299 struct drm_display_mode *
 300 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn);
 301
 302 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
 303 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 304                                        struct drm_connector *connector);
 305 #else
 306 static inline void drm_fb_helper_prepare(struct drm_device *dev,
 307                                         struct drm_fb_helper *helper,
 308                                         const struct drm_fb_helper_funcs *funcs)
 309 {
 310 }
 311
 312 static inline int drm_fb_helper_init(struct drm_device *dev,
 313                        struct drm_fb_helper *helper,
 314                        int max_conn)
 315 {
 316         return 0;
 317 }
 318
 319 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
 320 {
 321 }
 322
 323 static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
 324 {
 325         return 0;
 326 }
 327
 328 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 329                                             struct fb_info *info)
 330 {
 331         return 0;
 332 }
 333
 334 static inline int drm_fb_helper_set_par(struct fb_info *info)
 335 {
 336         return 0;
 337 }
 338
 339 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 340                                           struct fb_info *info)
 341 {
 342         return 0;
 343 }
 344
 345 static inline int
 346 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 347 {
 348         return 0;
 349 }
 350
 351 static inline struct fb_info *
 352 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 353 {
 354         return NULL;
 355 }
 356
 357 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 358 {
 359 }
 360
 361 static inline void drm_fb_helper_fill_var(struct fb_info *info,
 362                                           struct drm_fb_helper *fb_helper,
 363                                           uint32_t fb_width, uint32_t fb_height)
 364 {
 365 }
 366
 367 static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 368                                           uint32_t depth)
 369 {
 370 }
 371
 372 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
 373                                         struct fb_info *info)
 374 {
 375         return 0;
 376 }
 377
 378 static inline int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd,
 379                                       unsigned long arg)
 380 {
 381         return 0;
 382 }
 383
 384 static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 385 {
 386 }
 387
 388 static inline void drm_fb_helper_deferred_io(struct fb_info *info,
 389                                              struct list_head *pagelist)
 390 {
 391 }
 392
 393 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
 394                                              char __user *buf, size_t count,
 395                                              loff_t *ppos)
 396 {
 397         return -ENODEV;
 398 }
 399
 400 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
 401                                               const char __user *buf,
 402                                               size_t count, loff_t *ppos)
 403 {
 404         return -ENODEV;
 405 }
 406
 407 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
 408                                               const struct fb_fillrect *rect)
 409 {
 410 }
 411
 412 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
 413                                               const struct fb_copyarea *area)
 414 {
 415 }
 416
 417 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
 418                                                const struct fb_image *image)
 419 {
 420 }
 421
 422 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 423                                               const struct fb_fillrect *rect)
 424 {
 425 }
 426
 427 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 428                                               const struct fb_copyarea *area)
 429 {
 430 }
 431
 432 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 433                                                const struct fb_image *image)
 434 {
 435 }
 436
 437 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
 438                                              bool suspend)
 439 {
 440 }
 441
 442 static inline void
 443 drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend)
 444 {
 445 }
 446
 447 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 448 {
 449         return 0;
 450 }
 451
 452 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
 453                                                int bpp_sel)
 454 {
 455         return 0;
 456 }
 457
 458 static inline int
 459 drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 460 {
 461         return 0;
 462 }
 463
 464 static inline int drm_fb_helper_debug_enter(struct fb_info *info)
 465 {
 466         return 0;
 467 }
 468
 469 static inline int drm_fb_helper_debug_leave(struct fb_info *info)
 470 {
 471         return 0;
 472 }
 473
 474 static inline struct drm_display_mode *
 475 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 476                        int width, int height)
 477 {
 478         return NULL;
 479 }
 480
 481 static inline struct drm_display_mode *
 482 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 483                       int width, int height)
 484 {
 485         return NULL;
 486 }
 487
 488 static inline int
 489 drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
 490                                 struct drm_connector *connector)
 491 {
 492         return 0;
 493 }
 494
 495 static inline int
 496 drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 497                                    struct drm_connector *connector)
 498 {
 499         return 0;
 500 }
 501
 502 #endif
 503
 504 static inline int
 505 drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
 506                                               const char *name, bool primary)
 507 {
 508 #if IS_REACHABLE(CONFIG_FB)
 509         return remove_conflicting_framebuffers(a, name, primary);
 510 #else
 511         return 0;
 512 #endif
 513 }
 514
 515 #endif