include/drm/drm_crtc.h

   1 /*
   2  * Copyright © 2006 Keith Packard
   3  * Copyright © 2007-2008 Dave Airlie
   4  * Copyright © 2007-2008 Intel Corporation
   5  *   Jesse Barnes <jesse.barnes@intel.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25 #ifndef __DRM_CRTC_H__
  26 #define __DRM_CRTC_H__
  27
  28 #include <linux/i2c.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/types.h>
  31 #include <linux/idr.h>
  32 #include <linux/fb.h>
  33 #include <linux/hdmi.h>
  34 #include <drm/drm_mode.h>
  35 #include <drm/drm_fourcc.h>
  36 #include <drm/drm_modeset_lock.h>
  37
  38 struct drm_device;
  39 struct drm_mode_set;
  40 struct drm_framebuffer;
  41 struct drm_object_properties;
  42 struct drm_file;
  43 struct drm_clip_rect;
  44
  45 #define DRM_MODE_OBJECT_CRTC 0xcccccccc
  46 #define DRM_MODE_OBJECT_CONNECTOR 0xc0c0c0c0
  47 #define DRM_MODE_OBJECT_ENCODER 0xe0e0e0e0
  48 #define DRM_MODE_OBJECT_MODE 0xdededede
  49 #define DRM_MODE_OBJECT_PROPERTY 0xb0b0b0b0
  50 #define DRM_MODE_OBJECT_FB 0xfbfbfbfb
  51 #define DRM_MODE_OBJECT_BLOB 0xbbbbbbbb
  52 #define DRM_MODE_OBJECT_PLANE 0xeeeeeeee
  53 #define DRM_MODE_OBJECT_BRIDGE 0xbdbdbdbd
  54 #define DRM_MODE_OBJECT_ANY 0
  55
  56 struct drm_mode_object {
  57         uint32_t id;
  58         uint32_t type;
  59         struct drm_object_properties *properties;
  60 };
  61
  62 #define DRM_OBJECT_MAX_PROPERTY 24
  63 struct drm_object_properties {
  64         int count;
  65         uint32_t ids[DRM_OBJECT_MAX_PROPERTY];
  66         uint64_t values[DRM_OBJECT_MAX_PROPERTY];
  67 };
  68
  69 static inline int64_t U642I64(uint64_t val)
  70 {
  71         return (int64_t)*((int64_t *)&val);
  72 }
  73 static inline uint64_t I642U64(int64_t val)
  74 {
  75         return (uint64_t)*((uint64_t *)&val);
  76 }
  77
  78 enum drm_connector_force {
  79         DRM_FORCE_UNSPECIFIED,
  80         DRM_FORCE_OFF,
  81         DRM_FORCE_ON,         /* force on analog part normally */
  82         DRM_FORCE_ON_DIGITAL, /* for DVI-I use digital connector */
  83 };
  84
  85 #include <drm/drm_modes.h>
  86
  87 enum drm_connector_status {
  88         connector_status_connected = 1,
  89         connector_status_disconnected = 2,
  90         connector_status_unknown = 3,
  91 };
  92
  93 enum subpixel_order {
  94         SubPixelUnknown = 0,
  95         SubPixelHorizontalRGB,
  96         SubPixelHorizontalBGR,
  97         SubPixelVerticalRGB,
  98         SubPixelVerticalBGR,
  99         SubPixelNone,
 100 };
 101
 102 #define DRM_COLOR_FORMAT_RGB444         (1<<0)
 103 #define DRM_COLOR_FORMAT_YCRCB444       (1<<1)
 104 #define DRM_COLOR_FORMAT_YCRCB422       (1<<2)
 105 /*
 106  * Describes a given display (e.g. CRT or flat panel) and its limitations.
 107  */
 108 struct drm_display_info {
 109         char name[DRM_DISPLAY_INFO_LEN];
 110
 111         /* Physical size */
 112         unsigned int width_mm;
 113         unsigned int height_mm;
 114
 115         /* Clock limits FIXME: storage format */
 116         unsigned int min_vfreq, max_vfreq;
 117         unsigned int min_hfreq, max_hfreq;
 118         unsigned int pixel_clock;
 119         unsigned int bpc;
 120
 121         enum subpixel_order subpixel_order;
 122         u32 color_formats;
 123
 124         u8 cea_rev;
 125 };
 126
 127 struct drm_framebuffer_funcs {
 128         /* note: use drm_framebuffer_remove() */
 129         void (*destroy)(struct drm_framebuffer *framebuffer);
 130         int (*create_handle)(struct drm_framebuffer *fb,
 131                              struct drm_file *file_priv,
 132                              unsigned int *handle);
 133         /**
 134          * Optinal callback for the dirty fb ioctl.
 135          *
 136          * Userspace can notify the driver via this callback
 137          * that a area of the framebuffer has changed and should
 138          * be flushed to the display hardware.
 139          *
 140          * See documentation in drm_mode.h for the struct
 141          * drm_mode_fb_dirty_cmd for more information as all
 142          * the semantics and arguments have a one to one mapping
 143          * on this function.
 144          */
 145         int (*dirty)(struct drm_framebuffer *framebuffer,
 146                      struct drm_file *file_priv, unsigned flags,
 147                      unsigned color, struct drm_clip_rect *clips,
 148                      unsigned num_clips);
 149 };
 150
 151 struct drm_framebuffer {
 152         struct drm_device *dev;
 153         /*
 154          * Note that the fb is refcounted for the benefit of driver internals,
 155          * for example some hw, disabling a CRTC/plane is asynchronous, and
 156          * scanout does not actually complete until the next vblank.  So some
 157          * cleanup (like releasing the reference(s) on the backing GEM bo(s))
 158          * should be deferred.  In cases like this, the driver would like to
 159          * hold a ref to the fb even though it has already been removed from
 160          * userspace perspective.
 161          */
 162         struct kref refcount;
 163         /*
 164          * Place on the dev->mode_config.fb_list, access protected by
 165          * dev->mode_config.fb_lock.
 166          */
 167         struct list_head head;
 168         struct drm_mode_object base;
 169         const struct drm_framebuffer_funcs *funcs;
 170         unsigned int pitches[4];
 171         unsigned int offsets[4];
 172         unsigned int width;
 173         unsigned int height;
 174         /* depth can be 15 or 16 */
 175         unsigned int depth;
 176         int bits_per_pixel;
 177         int flags;
 178         uint32_t pixel_format; /* fourcc format */
 179         struct list_head filp_head;
 180         /* if you are using the helper */
 181         void *helper_private;
 182 };
 183
 184 struct drm_property_blob {
 185         struct drm_mode_object base;
 186         struct list_head head;
 187         unsigned int length;
 188         unsigned char data[];
 189 };
 190
 191 struct drm_property_enum {
 192         uint64_t value;
 193         struct list_head head;
 194         char name[DRM_PROP_NAME_LEN];
 195 };
 196
 197 struct drm_property {
 198         struct list_head head;
 199         struct drm_mode_object base;
 200         uint32_t flags;
 201         char name[DRM_PROP_NAME_LEN];
 202         uint32_t num_values;
 203         uint64_t *values;
 204         struct drm_device *dev;
 205
 206         struct list_head enum_blob_list;
 207 };
 208
 209 void drm_modeset_lock_all(struct drm_device *dev);
 210 void drm_modeset_unlock_all(struct drm_device *dev);
 211 void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
 212
 213 struct drm_crtc;
 214 struct drm_connector;
 215 struct drm_encoder;
 216 struct drm_pending_vblank_event;
 217 struct drm_plane;
 218 struct drm_bridge;
 219
 220 /**
 221  * drm_crtc_funcs - control CRTCs for a given device
 222  * @save: save CRTC state
 223  * @restore: restore CRTC state
 224  * @reset: reset CRTC after state has been invalidated (e.g. resume)
 225  * @cursor_set: setup the cursor
 226  * @cursor_move: move the cursor
 227  * @gamma_set: specify color ramp for CRTC
 228  * @destroy: deinit and free object
 229  * @set_property: called when a property is changed
 230  * @set_config: apply a new CRTC configuration
 231  * @page_flip: initiate a page flip
 232  *
 233  * The drm_crtc_funcs structure is the central CRTC management structure
 234  * in the DRM.  Each CRTC controls one or more connectors (note that the name
 235  * CRTC is simply historical, a CRTC may control LVDS, VGA, DVI, TV out, etc.
 236  * connectors, not just CRTs).
 237  *
 238  * Each driver is responsible for filling out this structure at startup time,
 239  * in addition to providing other modesetting features, like i2c and DDC
 240  * bus accessors.
 241  */
 242 struct drm_crtc_funcs {
 243         /* Save CRTC state */
 244         void (*save)(struct drm_crtc *crtc); /* suspend? */
 245         /* Restore CRTC state */
 246         void (*restore)(struct drm_crtc *crtc); /* resume? */
 247         /* Reset CRTC state */
 248         void (*reset)(struct drm_crtc *crtc);
 249
 250         /* cursor controls */
 251         int (*cursor_set)(struct drm_crtc *crtc, struct drm_file *file_priv,
 252                           uint32_t handle, uint32_t width, uint32_t height);
 253         int (*cursor_set2)(struct drm_crtc *crtc, struct drm_file *file_priv,
 254                            uint32_t handle, uint32_t width, uint32_t height,
 255                            int32_t hot_x, int32_t hot_y);
 256         int (*cursor_move)(struct drm_crtc *crtc, int x, int y);
 257
 258         /* Set gamma on the CRTC */
 259         void (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b,
 260                           uint32_t start, uint32_t size);
 261         /* Object destroy routine */
 262         void (*destroy)(struct drm_crtc *crtc);
 263
 264         int (*set_config)(struct drm_mode_set *set);
 265
 266         /*
 267          * Flip to the given framebuffer.  This implements the page
 268          * flip ioctl described in drm_mode.h, specifically, the
 269          * implementation must return immediately and block all
 270          * rendering to the current fb until the flip has completed.
 271          * If userspace set the event flag in the ioctl, the event
 272          * argument will point to an event to send back when the flip
 273          * completes, otherwise it will be NULL.
 274          */
 275         int (*page_flip)(struct drm_crtc *crtc,
 276                          struct drm_framebuffer *fb,
 277                          struct drm_pending_vblank_event *event,
 278                          uint32_t flags);
 279
 280         int (*set_property)(struct drm_crtc *crtc,
 281                             struct drm_property *property, uint64_t val);
 282 };
 283
 284 /**
 285  * drm_crtc - central CRTC control structure
 286  * @dev: parent DRM device
 287  * @head: list management
 288  * @mutex: per-CRTC locking
 289  * @base: base KMS object for ID tracking etc.
 290  * @primary: primary plane for this CRTC
 291  * @cursor: cursor plane for this CRTC
 292  * @enabled: is this CRTC enabled?
 293  * @mode: current mode timings
 294  * @hwmode: mode timings as programmed to hw regs
 295  * @invert_dimensions: for purposes of error checking crtc vs fb sizes,
 296  *    invert the width/height of the crtc.  This is used if the driver
 297  *    is performing 90 or 270 degree rotated scanout
 298  * @x: x position on screen
 299  * @y: y position on screen
 300  * @funcs: CRTC control functions
 301  * @gamma_size: size of gamma ramp
 302  * @gamma_store: gamma ramp values
 303  * @framedur_ns: precise frame timing
 304  * @framedur_ns: precise line timing
 305  * @pixeldur_ns: precise pixel timing
 306  * @helper_private: mid-layer private data
 307  * @properties: property tracking for this CRTC
 308  *
 309  * Each CRTC may have one or more connectors associated with it.  This structure
 310  * allows the CRTC to be controlled.
 311  */
 312 struct drm_crtc {
 313         struct drm_device *dev;
 314         struct list_head head;
 315
 316         /**
 317          * crtc mutex
 318          *
 319          * This provides a read lock for the overall crtc state (mode, dpms
 320          * state, ...) and a write lock for everything which can be update
 321          * without a full modeset (fb, cursor data, ...)
 322          */
 323         struct drm_modeset_lock mutex;
 324
 325         struct drm_mode_object base;
 326
 327         /* primary and cursor planes for CRTC */
 328         struct drm_plane *primary;
 329         struct drm_plane *cursor;
 330
 331         /* Temporary tracking of the old fb while a modeset is ongoing. Used
 332          * by drm_mode_set_config_internal to implement correct refcounting. */
 333         struct drm_framebuffer *old_fb;
 334
 335         bool enabled;
 336
 337         /* Requested mode from modesetting. */
 338         struct drm_display_mode mode;
 339
 340         /* Programmed mode in hw, after adjustments for encoders,
 341          * crtc, panel scaling etc. Needed for timestamping etc.
 342          */
 343         struct drm_display_mode hwmode;
 344
 345         bool invert_dimensions;
 346
 347         int x, y;
 348         const struct drm_crtc_funcs *funcs;
 349
 350         /* CRTC gamma size for reporting to userspace */
 351         uint32_t gamma_size;
 352         uint16_t *gamma_store;
 353
 354         /* Constants needed for precise vblank and swap timestamping. */
 355         int framedur_ns, linedur_ns, pixeldur_ns;
 356
 357         /* if you are using the helper */
 358         void *helper_private;
 359
 360         struct drm_object_properties properties;
 361 };
 362
 363
 364 /**
 365  * drm_connector_funcs - control connectors on a given device
 366  * @dpms: set power state (see drm_crtc_funcs above)
 367  * @save: save connector state
 368  * @restore: restore connector state
 369  * @reset: reset connector after state has been invalidated (e.g. resume)
 370  * @detect: is this connector active?
 371  * @fill_modes: fill mode list for this connector
 372  * @set_property: property for this connector may need an update
 373  * @destroy: make object go away
 374  * @force: notify the driver that the connector is forced on
 375  *
 376  * Each CRTC may have one or more connectors attached to it.  The functions
 377  * below allow the core DRM code to control connectors, enumerate available modes,
 378  * etc.
 379  */
 380 struct drm_connector_funcs {
 381         void (*dpms)(struct drm_connector *connector, int mode);
 382         void (*save)(struct drm_connector *connector);
 383         void (*restore)(struct drm_connector *connector);
 384         void (*reset)(struct drm_connector *connector);
 385
 386         /* Check to see if anything is attached to the connector.
 387          * @force is set to false whilst polling, true when checking the
 388          * connector due to user request. @force can be used by the driver
 389          * to avoid expensive, destructive operations during automated
 390          * probing.
 391          */
 392         enum drm_connector_status (*detect)(struct drm_connector *connector,
 393                                             bool force);
 394         int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height);
 395         int (*set_property)(struct drm_connector *connector, struct drm_property *property,
 396                              uint64_t val);
 397         void (*destroy)(struct drm_connector *connector);
 398         void (*force)(struct drm_connector *connector);
 399 };
 400
 401 /**
 402  * drm_encoder_funcs - encoder controls
 403  * @reset: reset state (e.g. at init or resume time)
 404  * @destroy: cleanup and free associated data
 405  *
 406  * Encoders sit between CRTCs and connectors.
 407  */
 408 struct drm_encoder_funcs {
 409         void (*reset)(struct drm_encoder *encoder);
 410         void (*destroy)(struct drm_encoder *encoder);
 411 };
 412
 413 #define DRM_CONNECTOR_MAX_ENCODER 3
 414
 415 /**
 416  * drm_encoder - central DRM encoder structure
 417  * @dev: parent DRM device
 418  * @head: list management
 419  * @base: base KMS object
 420  * @name: encoder name
 421  * @encoder_type: one of the %DRM_MODE_ENCODER_<foo> types in drm_mode.h
 422  * @possible_crtcs: bitmask of potential CRTC bindings
 423  * @possible_clones: bitmask of potential sibling encoders for cloning
 424  * @crtc: currently bound CRTC
 425  * @bridge: bridge associated to the encoder
 426  * @funcs: control functions
 427  * @helper_private: mid-layer private data
 428  *
 429  * CRTCs drive pixels to encoders, which convert them into signals
 430  * appropriate for a given connector or set of connectors.
 431  */
 432 struct drm_encoder {
 433         struct drm_device *dev;
 434         struct list_head head;
 435
 436         struct drm_mode_object base;
 437         char *name;
 438         int encoder_type;
 439         uint32_t possible_crtcs;
 440         uint32_t possible_clones;
 441
 442         struct drm_crtc *crtc;
 443         struct drm_bridge *bridge;
 444         const struct drm_encoder_funcs *funcs;
 445         void *helper_private;
 446 };
 447
 448 /* should we poll this connector for connects and disconnects */
 449 /* hot plug detectable */
 450 #define DRM_CONNECTOR_POLL_HPD (1 << 0)
 451 /* poll for connections */
 452 #define DRM_CONNECTOR_POLL_CONNECT (1 << 1)
 453 /* can cleanly poll for disconnections without flickering the screen */
 454 /* DACs should rarely do this without a lot of testing */
 455 #define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2)
 456
 457 #define MAX_ELD_BYTES   128
 458
 459 /**
 460  * drm_connector - central DRM connector control structure
 461  * @dev: parent DRM device
 462  * @kdev: kernel device for sysfs attributes
 463  * @attr: sysfs attributes
 464  * @head: list management
 465  * @base: base KMS object
 466  * @name: connector name
 467  * @connector_type: one of the %DRM_MODE_CONNECTOR_<foo> types from drm_mode.h
 468  * @connector_type_id: index into connector type enum
 469  * @interlace_allowed: can this connector handle interlaced modes?
 470  * @doublescan_allowed: can this connector handle doublescan?
 471  * @modes: modes available on this connector (from fill_modes() + user)
 472  * @status: one of the drm_connector_status enums (connected, not, or unknown)
 473  * @probed_modes: list of modes derived directly from the display
 474  * @display_info: information about attached display (e.g. from EDID)
 475  * @funcs: connector control functions
 476  * @edid_blob_ptr: DRM property containing EDID if present
 477  * @properties: property tracking for this connector
 478  * @polled: a %DRM_CONNECTOR_POLL_<foo> value for core driven polling
 479  * @dpms: current dpms state
 480  * @helper_private: mid-layer private data
 481  * @force: a %DRM_FORCE_<foo> state for forced mode sets
 482  * @encoder_ids: valid encoders for this connector
 483  * @encoder: encoder driving this connector, if any
 484  * @eld: EDID-like data, if present
 485  * @dvi_dual: dual link DVI, if found
 486  * @max_tmds_clock: max clock rate, if found
 487  * @latency_present: AV delay info from ELD, if found
 488  * @video_latency: video latency info from ELD, if found
 489  * @audio_latency: audio latency info from ELD, if found
 490  * @null_edid_counter: track sinks that give us all zeros for the EDID
 491  *
 492  * Each connector may be connected to one or more CRTCs, or may be clonable by
 493  * another connector if they can share a CRTC.  Each connector also has a specific
 494  * position in the broader display (referred to as a 'screen' though it could
 495  * span multiple monitors).
 496  */
 497 struct drm_connector {
 498         struct drm_device *dev;
 499         struct device *kdev;
 500         struct device_attribute *attr;
 501         struct list_head head;
 502
 503         struct drm_mode_object base;
 504
 505         char *name;
 506         int connector_type;
 507         int connector_type_id;
 508         bool interlace_allowed;
 509         bool doublescan_allowed;
 510         bool stereo_allowed;
 511         struct list_head modes; /* list of modes on this connector */
 512
 513         enum drm_connector_status status;
 514
 515         /* these are modes added by probing with DDC or the BIOS */
 516         struct list_head probed_modes;
 517
 518         struct drm_display_info display_info;
 519         const struct drm_connector_funcs *funcs;
 520
 521         struct drm_property_blob *edid_blob_ptr;
 522         struct drm_object_properties properties;
 523
 524         uint8_t polled; /* DRM_CONNECTOR_POLL_* */
 525
 526         /* requested DPMS state */
 527         int dpms;
 528
 529         void *helper_private;
 530
 531         /* forced on connector */
 532         enum drm_connector_force force;
 533         uint32_t encoder_ids[DRM_CONNECTOR_MAX_ENCODER];
 534         struct drm_encoder *encoder; /* currently active encoder */
 535
 536         /* EDID bits */
 537         uint8_t eld[MAX_ELD_BYTES];
 538         bool dvi_dual;
 539         int max_tmds_clock;     /* in MHz */
 540         bool latency_present[2];
 541         int video_latency[2];   /* [0]: progressive, [1]: interlaced */
 542         int audio_latency[2];
 543         int null_edid_counter; /* needed to workaround some HW bugs where we get all 0s */
 544         unsigned bad_edid_counter;
 545 };
 546
 547 /**
 548  * drm_plane_funcs - driver plane control functions
 549  * @update_plane: update the plane configuration
 550  * @disable_plane: shut down the plane
 551  * @destroy: clean up plane resources
 552  * @set_property: called when a property is changed
 553  */
 554 struct drm_plane_funcs {
 555         int (*update_plane)(struct drm_plane *plane,
 556                             struct drm_crtc *crtc, struct drm_framebuffer *fb,
 557                             int crtc_x, int crtc_y,
 558                             unsigned int crtc_w, unsigned int crtc_h,
 559                             uint32_t src_x, uint32_t src_y,
 560                             uint32_t src_w, uint32_t src_h);
 561         int (*disable_plane)(struct drm_plane *plane);
 562         void (*destroy)(struct drm_plane *plane);
 563
 564         int (*set_property)(struct drm_plane *plane,
 565                             struct drm_property *property, uint64_t val);
 566 };
 567
 568 enum drm_plane_type {
 569         DRM_PLANE_TYPE_OVERLAY,
 570         DRM_PLANE_TYPE_PRIMARY,
 571         DRM_PLANE_TYPE_CURSOR,
 572 };
 573
 574 /**
 575  * drm_plane - central DRM plane control structure
 576  * @dev: DRM device this plane belongs to
 577  * @head: for list management
 578  * @base: base mode object
 579  * @possible_crtcs: pipes this plane can be bound to
 580  * @format_types: array of formats supported by this plane
 581  * @format_count: number of formats supported
 582  * @crtc: currently bound CRTC
 583  * @fb: currently bound fb
 584  * @funcs: helper functions
 585  * @properties: property tracking for this plane
 586  * @type: type of plane (overlay, primary, cursor)
 587  */
 588 struct drm_plane {
 589         struct drm_device *dev;
 590         struct list_head head;
 591
 592         struct drm_mode_object base;
 593
 594         uint32_t possible_crtcs;
 595         uint32_t *format_types;
 596         uint32_t format_count;
 597
 598         struct drm_crtc *crtc;
 599         struct drm_framebuffer *fb;
 600
 601         const struct drm_plane_funcs *funcs;
 602
 603         struct drm_object_properties properties;
 604
 605         enum drm_plane_type type;
 606 };
 607
 608 /**
 609  * drm_bridge_funcs - drm_bridge control functions
 610  * @mode_fixup: Try to fixup (or reject entirely) proposed mode for this bridge
 611  * @disable: Called right before encoder prepare, disables the bridge
 612  * @post_disable: Called right after encoder prepare, for lockstepped disable
 613  * @mode_set: Set this mode to the bridge
 614  * @pre_enable: Called right before encoder commit, for lockstepped commit
 615  * @enable: Called right after encoder commit, enables the bridge
 616  * @destroy: make object go away
 617  */
 618 struct drm_bridge_funcs {
 619         bool (*mode_fixup)(struct drm_bridge *bridge,
 620                            const struct drm_display_mode *mode,
 621                            struct drm_display_mode *adjusted_mode);
 622         void (*disable)(struct drm_bridge *bridge);
 623         void (*post_disable)(struct drm_bridge *bridge);
 624         void (*mode_set)(struct drm_bridge *bridge,
 625                          struct drm_display_mode *mode,
 626                          struct drm_display_mode *adjusted_mode);
 627         void (*pre_enable)(struct drm_bridge *bridge);
 628         void (*enable)(struct drm_bridge *bridge);
 629         void (*destroy)(struct drm_bridge *bridge);
 630 };
 631
 632 /**
 633  * drm_bridge - central DRM bridge control structure
 634  * @dev: DRM device this bridge belongs to
 635  * @head: list management
 636  * @base: base mode object
 637  * @funcs: control functions
 638  * @driver_private: pointer to the bridge driver's internal context
 639  */
 640 struct drm_bridge {
 641         struct drm_device *dev;
 642         struct list_head head;
 643
 644         struct drm_mode_object base;
 645
 646         const struct drm_bridge_funcs *funcs;
 647         void *driver_private;
 648 };
 649
 650 /**
 651  * drm_mode_set - new values for a CRTC config change
 652  * @head: list management
 653  * @fb: framebuffer to use for new config
 654  * @crtc: CRTC whose configuration we're about to change
 655  * @mode: mode timings to use
 656  * @x: position of this CRTC relative to @fb
 657  * @y: position of this CRTC relative to @fb
 658  * @connectors: array of connectors to drive with this CRTC if possible
 659  * @num_connectors: size of @connectors array
 660  *
 661  * Represents a single crtc the connectors that it drives with what mode
 662  * and from which framebuffer it scans out from.
 663  *
 664  * This is used to set modes.
 665  */
 666 struct drm_mode_set {
 667         struct drm_framebuffer *fb;
 668         struct drm_crtc *crtc;
 669         struct drm_display_mode *mode;
 670
 671         uint32_t x;
 672         uint32_t y;
 673
 674         struct drm_connector **connectors;
 675         size_t num_connectors;
 676 };
 677
 678 /**
 679  * struct drm_mode_config_funcs - basic driver provided mode setting functions
 680  * @fb_create: create a new framebuffer object
 681  * @output_poll_changed: function to handle output configuration changes
 682  *
 683  * Some global (i.e. not per-CRTC, connector, etc) mode setting functions that
 684  * involve drivers.
 685  */
 686 struct drm_mode_config_funcs {
 687         struct drm_framebuffer *(*fb_create)(struct drm_device *dev,
 688                                              struct drm_file *file_priv,
 689                                              struct drm_mode_fb_cmd2 *mode_cmd);
 690         void (*output_poll_changed)(struct drm_device *dev);
 691 };
 692
 693 /**
 694  * drm_mode_group - group of mode setting resources for potential sub-grouping
 695  * @num_crtcs: CRTC count
 696  * @num_encoders: encoder count
 697  * @num_connectors: connector count
 698  * @id_list: list of KMS object IDs in this group
 699  *
 700  * Currently this simply tracks the global mode setting state.  But in the
 701  * future it could allow groups of objects to be set aside into independent
 702  * control groups for use by different user level processes (e.g. two X servers
 703  * running simultaneously on different heads, each with their own mode
 704  * configuration and freedom of mode setting).
 705  */
 706 struct drm_mode_group {
 707         uint32_t num_crtcs;
 708         uint32_t num_encoders;
 709         uint32_t num_connectors;
 710         uint32_t num_bridges;
 711
 712         /* list of object IDs for this group */
 713         uint32_t *id_list;
 714 };
 715
 716 /**
 717  * drm_mode_config - Mode configuration control structure
 718  * @mutex: mutex protecting KMS related lists and structures
 719  * @idr_mutex: mutex for KMS ID allocation and management
 720  * @crtc_idr: main KMS ID tracking object
 721  * @num_fb: number of fbs available
 722  * @fb_list: list of framebuffers available
 723  * @num_connector: number of connectors on this device
 724  * @connector_list: list of connector objects
 725  * @num_bridge: number of bridges on this device
 726  * @bridge_list: list of bridge objects
 727  * @num_encoder: number of encoders on this device
 728  * @encoder_list: list of encoder objects
 729  * @num_crtc: number of CRTCs on this device
 730  * @crtc_list: list of CRTC objects
 731  * @min_width: minimum pixel width on this device
 732  * @min_height: minimum pixel height on this device
 733  * @max_width: maximum pixel width on this device
 734  * @max_height: maximum pixel height on this device
 735  * @funcs: core driver provided mode setting functions
 736  * @fb_base: base address of the framebuffer
 737  * @poll_enabled: track polling status for this device
 738  * @output_poll_work: delayed work for polling in process context
 739  * @*_property: core property tracking
 740  *
 741  * Core mode resource tracking structure.  All CRTC, encoders, and connectors
 742  * enumerated by the driver are added here, as are global properties.  Some
 743  * global restrictions are also here, e.g. dimension restrictions.
 744  */
 745 struct drm_mode_config {
 746         struct mutex mutex; /* protects configuration (mode lists etc.) */
 747         struct drm_modeset_lock connection_mutex; /* protects connector->encoder and encoder->crtc links */
 748         struct drm_modeset_acquire_ctx *acquire_ctx; /* for legacy _lock_all() / _unlock_all() */
 749         struct mutex idr_mutex; /* for IDR management */
 750         struct idr crtc_idr; /* use this idr for all IDs, fb, crtc, connector, modes - just makes life easier */
 751         /* this is limited to one for now */
 752
 753
 754         /**
 755          * fb_lock - mutex to protect fb state
 756          *
 757          * Besides the global fb list his also protects the fbs list in the
 758          * file_priv
 759          */
 760         struct mutex fb_lock;
 761         int num_fb;
 762         struct list_head fb_list;
 763
 764         int num_connector;
 765         struct list_head connector_list;
 766         int num_bridge;
 767         struct list_head bridge_list;
 768         int num_encoder;
 769         struct list_head encoder_list;
 770
 771         /*
 772          * Track # of overlay planes separately from # of total planes.  By
 773          * default we only advertise overlay planes to userspace; if userspace
 774          * sets the "universal plane" capability bit, we'll go ahead and
 775          * expose all planes.
 776          */
 777         int num_overlay_plane;
 778         int num_total_plane;
 779         struct list_head plane_list;
 780
 781         int num_crtc;
 782         struct list_head crtc_list;
 783
 784         struct list_head property_list;
 785
 786         int min_width, min_height;
 787         int max_width, max_height;
 788         const struct drm_mode_config_funcs *funcs;
 789         resource_size_t fb_base;
 790
 791         /* output poll support */
 792         bool poll_enabled;
 793         bool poll_running;
 794         struct delayed_work output_poll_work;
 795
 796         /* pointers to standard properties */
 797         struct list_head property_blob_list;
 798         struct drm_property *edid_property;
 799         struct drm_property *dpms_property;
 800         struct drm_property *plane_type_property;
 801
 802         /* DVI-I properties */
 803         struct drm_property *dvi_i_subconnector_property;
 804         struct drm_property *dvi_i_select_subconnector_property;
 805
 806         /* TV properties */
 807         struct drm_property *tv_subconnector_property;
 808         struct drm_property *tv_select_subconnector_property;
 809         struct drm_property *tv_mode_property;
 810         struct drm_property *tv_left_margin_property;
 811         struct drm_property *tv_right_margin_property;
 812         struct drm_property *tv_top_margin_property;
 813         struct drm_property *tv_bottom_margin_property;
 814         struct drm_property *tv_brightness_property;
 815         struct drm_property *tv_contrast_property;
 816         struct drm_property *tv_flicker_reduction_property;
 817         struct drm_property *tv_overscan_property;
 818         struct drm_property *tv_saturation_property;
 819         struct drm_property *tv_hue_property;
 820
 821         /* Optional properties */
 822         struct drm_property *scaling_mode_property;
 823         struct drm_property *dirty_info_property;
 824
 825         /* dumb ioctl parameters */
 826         uint32_t preferred_depth, prefer_shadow;
 827
 828         /* whether async page flip is supported or not */
 829         bool async_page_flip;
 830
 831         /* cursor size */
 832         uint32_t cursor_width, cursor_height;
 833 };
 834
 835 #define obj_to_crtc(x) container_of(x, struct drm_crtc, base)
 836 #define obj_to_connector(x) container_of(x, struct drm_connector, base)
 837 #define obj_to_encoder(x) container_of(x, struct drm_encoder, base)
 838 #define obj_to_mode(x) container_of(x, struct drm_display_mode, base)
 839 #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)
 840 #define obj_to_property(x) container_of(x, struct drm_property, base)
 841 #define obj_to_blob(x) container_of(x, struct drm_property_blob, base)
 842 #define obj_to_plane(x) container_of(x, struct drm_plane, base)
 843
 844 struct drm_prop_enum_list {
 845         int type;
 846         char *name;
 847 };
 848
 849 extern int drm_crtc_init_with_planes(struct drm_device *dev,
 850                                      struct drm_crtc *crtc,
 851                                      struct drm_plane *primary,
 852                                      void *cursor,
 853                                      const struct drm_crtc_funcs *funcs);
 854 extern int drm_crtc_init(struct drm_device *dev,
 855                          struct drm_crtc *crtc,
 856                          const struct drm_crtc_funcs *funcs);
 857 extern void drm_crtc_cleanup(struct drm_crtc *crtc);
 858 extern unsigned int drm_crtc_index(struct drm_crtc *crtc);
 859
 860 /**
 861  * drm_crtc_mask - find the mask of a registered CRTC
 862  * @crtc: CRTC to find mask for
 863  *
 864  * Given a registered CRTC, return the mask bit of that CRTC for an
 865  * encoder's possible_crtcs field.
 866  */
 867 static inline uint32_t drm_crtc_mask(struct drm_crtc *crtc)
 868 {
 869         return 1 << drm_crtc_index(crtc);
 870 }
 871
 872 extern void drm_connector_ida_init(void);
 873 extern void drm_connector_ida_destroy(void);
 874 extern int drm_connector_init(struct drm_device *dev,
 875                               struct drm_connector *connector,
 876                               const struct drm_connector_funcs *funcs,
 877                               int connector_type);
 878
 879 extern void drm_connector_cleanup(struct drm_connector *connector);
 880 /* helper to unplug all connectors from sysfs for device */
 881 extern void drm_connector_unplug_all(struct drm_device *dev);
 882
 883 extern int drm_bridge_init(struct drm_device *dev, struct drm_bridge *bridge,
 884                            const struct drm_bridge_funcs *funcs);
 885 extern void drm_bridge_cleanup(struct drm_bridge *bridge);
 886
 887 extern int drm_encoder_init(struct drm_device *dev,
 888                             struct drm_encoder *encoder,
 889                             const struct drm_encoder_funcs *funcs,
 890                             int encoder_type);
 891
 892 /**
 893  * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
 894  * @encoder: encoder to test
 895  * @crtc: crtc to test
 896  *
 897  * Return false if @encoder can't be driven by @crtc, true otherwise.
 898  */
 899 static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
 900                                        struct drm_crtc *crtc)
 901 {
 902         return !!(encoder->possible_crtcs & drm_crtc_mask(crtc));
 903 }
 904
 905 extern int drm_universal_plane_init(struct drm_device *dev,
 906                                     struct drm_plane *plane,
 907                                     unsigned long possible_crtcs,
 908                                     const struct drm_plane_funcs *funcs,
 909                                     const uint32_t *formats,
 910                                     uint32_t format_count,
 911                                     enum drm_plane_type type);
 912 extern int drm_plane_init(struct drm_device *dev,
 913                           struct drm_plane *plane,
 914                           unsigned long possible_crtcs,
 915                           const struct drm_plane_funcs *funcs,
 916                           const uint32_t *formats, uint32_t format_count,
 917                           bool is_primary);
 918 extern void drm_plane_cleanup(struct drm_plane *plane);
 919 extern void drm_plane_force_disable(struct drm_plane *plane);
 920 extern int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 921                                    int x, int y,
 922                                    const struct drm_display_mode *mode,
 923                                    const struct drm_framebuffer *fb);
 924
 925 extern void drm_encoder_cleanup(struct drm_encoder *encoder);
 926
 927 extern const char *drm_get_connector_status_name(enum drm_connector_status status);
 928 extern const char *drm_get_subpixel_order_name(enum subpixel_order order);
 929 extern const char *drm_get_dpms_name(int val);
 930 extern const char *drm_get_dvi_i_subconnector_name(int val);
 931 extern const char *drm_get_dvi_i_select_name(int val);
 932 extern const char *drm_get_tv_subconnector_name(int val);
 933 extern const char *drm_get_tv_select_name(int val);
 934 extern void drm_fb_release(struct drm_file *file_priv);
 935 extern int drm_mode_group_init_legacy_group(struct drm_device *dev, struct drm_mode_group *group);
 936 extern void drm_mode_group_destroy(struct drm_mode_group *group);
 937 extern bool drm_probe_ddc(struct i2c_adapter *adapter);
 938 extern struct edid *drm_get_edid(struct drm_connector *connector,
 939                                  struct i2c_adapter *adapter);
 940 extern struct edid *drm_edid_duplicate(const struct edid *edid);
 941 extern int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
 942 extern void drm_mode_config_init(struct drm_device *dev);
 943 extern void drm_mode_config_reset(struct drm_device *dev);
 944 extern void drm_mode_config_cleanup(struct drm_device *dev);
 945
 946 extern int drm_mode_connector_update_edid_property(struct drm_connector *connector,
 947                                                 struct edid *edid);
 948
 949 static inline bool drm_property_type_is(struct drm_property *property,
 950                 uint32_t type)
 951 {
 952         /* instanceof for props.. handles extended type vs original types: */
 953         if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
 954                 return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
 955         return property->flags & type;
 956 }
 957
 958 static inline bool drm_property_type_valid(struct drm_property *property)
 959 {
 960         if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
 961                 return !(property->flags & DRM_MODE_PROP_LEGACY_TYPE);
 962         return !!(property->flags & DRM_MODE_PROP_LEGACY_TYPE);
 963 }
 964
 965 extern int drm_object_property_set_value(struct drm_mode_object *obj,
 966                                          struct drm_property *property,
 967                                          uint64_t val);
 968 extern int drm_object_property_get_value(struct drm_mode_object *obj,
 969                                          struct drm_property *property,
 970                                          uint64_t *value);
 971 extern int drm_framebuffer_init(struct drm_device *dev,
 972                                 struct drm_framebuffer *fb,
 973                                 const struct drm_framebuffer_funcs *funcs);
 974 extern struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
 975                                                       uint32_t id);
 976 extern void drm_framebuffer_unreference(struct drm_framebuffer *fb);
 977 extern void drm_framebuffer_reference(struct drm_framebuffer *fb);
 978 extern void drm_framebuffer_remove(struct drm_framebuffer *fb);
 979 extern void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
 980 extern void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);
 981
 982 extern void drm_object_attach_property(struct drm_mode_object *obj,
 983                                        struct drm_property *property,
 984                                        uint64_t init_val);
 985 extern struct drm_property *drm_property_create(struct drm_device *dev, int flags,
 986                                                 const char *name, int num_values);
 987 extern struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,
 988                                          const char *name,
 989                                          const struct drm_prop_enum_list *props,
 990                                          int num_values);
 991 struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
 992                                          int flags, const char *name,
 993                                          const struct drm_prop_enum_list *props,
 994                                          int num_values);
 995 struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
 996                                          const char *name,
 997                                          uint64_t min, uint64_t max);
 998 struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
 999                                          int flags, const char *name,
1000                                          int64_t min, int64_t max);
1001 struct drm_property *drm_property_create_object(struct drm_device *dev,
1002                                          int flags, const char *name, uint32_t type);
1003 extern void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
1004 extern int drm_property_add_enum(struct drm_property *property, int index,
1005                                  uint64_t value, const char *name);
1006 extern int drm_mode_create_dvi_i_properties(struct drm_device *dev);
1007 extern int drm_mode_create_tv_properties(struct drm_device *dev, int num_formats,
1008                                      char *formats[]);
1009 extern int drm_mode_create_scaling_mode_property(struct drm_device *dev);
1010 extern int drm_mode_create_dirty_info_property(struct drm_device *dev);
1011
1012 extern int drm_mode_connector_attach_encoder(struct drm_connector *connector,
1013                                              struct drm_encoder *encoder);
1014 extern int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
1015                                          int gamma_size);
1016 extern struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
1017                 uint32_t id, uint32_t type);
1018
1019 /* IOCTLs */
1020 extern int drm_mode_getresources(struct drm_device *dev,
1021                                  void *data, struct drm_file *file_priv);
1022 extern int drm_mode_getplane_res(struct drm_device *dev, void *data,
1023                                    struct drm_file *file_priv);
1024 extern int drm_mode_getcrtc(struct drm_device *dev,
1025                             void *data, struct drm_file *file_priv);
1026 extern int drm_mode_getconnector(struct drm_device *dev,
1027                               void *data, struct drm_file *file_priv);
1028 extern int drm_mode_set_config_internal(struct drm_mode_set *set);
1029 extern int drm_mode_setcrtc(struct drm_device *dev,
1030                             void *data, struct drm_file *file_priv);
1031 extern int drm_mode_getplane(struct drm_device *dev,
1032                                void *data, struct drm_file *file_priv);
1033 extern int drm_mode_setplane(struct drm_device *dev,
1034                                void *data, struct drm_file *file_priv);
1035 extern int drm_mode_cursor_ioctl(struct drm_device *dev,
1036                                 void *data, struct drm_file *file_priv);
1037 extern int drm_mode_cursor2_ioctl(struct drm_device *dev,
1038                                 void *data, struct drm_file *file_priv);
1039 extern int drm_mode_addfb(struct drm_device *dev,
1040                           void *data, struct drm_file *file_priv);
1041 extern int drm_mode_addfb2(struct drm_device *dev,
1042                            void *data, struct drm_file *file_priv);
1043 extern uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth);
1044 extern int drm_mode_rmfb(struct drm_device *dev,
1045                          void *data, struct drm_file *file_priv);
1046 extern int drm_mode_getfb(struct drm_device *dev,
1047                           void *data, struct drm_file *file_priv);
1048 extern int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
1049                                   void *data, struct drm_file *file_priv);
1050
1051 extern int drm_mode_getproperty_ioctl(struct drm_device *dev,
1052                                       void *data, struct drm_file *file_priv);
1053 extern int drm_mode_getblob_ioctl(struct drm_device *dev,
1054                                   void *data, struct drm_file *file_priv);
1055 extern int drm_mode_connector_property_set_ioctl(struct drm_device *dev,
1056                                               void *data, struct drm_file *file_priv);
1057 extern int drm_mode_getencoder(struct drm_device *dev,
1058                                void *data, struct drm_file *file_priv);
1059 extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
1060                                     void *data, struct drm_file *file_priv);
1061 extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
1062                                     void *data, struct drm_file *file_priv);
1063 extern u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
1064 extern enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
1065 extern bool drm_detect_hdmi_monitor(struct edid *edid);
1066 extern bool drm_detect_monitor_audio(struct edid *edid);
1067 extern bool drm_rgb_quant_range_selectable(struct edid *edid);
1068 extern int drm_mode_page_flip_ioctl(struct drm_device *dev,
1069                                     void *data, struct drm_file *file_priv);
1070 extern int drm_add_modes_noedid(struct drm_connector *connector,
1071                                 int hdisplay, int vdisplay);
1072 extern void drm_set_preferred_mode(struct drm_connector *connector,
1073                                    int hpref, int vpref);
1074
1075 extern int drm_edid_header_is_valid(const u8 *raw_edid);
1076 extern bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid);
1077 extern bool drm_edid_is_valid(struct edid *edid);
1078 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
1079                                            int hsize, int vsize, int fresh,
1080                                            bool rb);
1081
1082 extern int drm_mode_create_dumb_ioctl(struct drm_device *dev,
1083                                       void *data, struct drm_file *file_priv);
1084 extern int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
1085                                     void *data, struct drm_file *file_priv);
1086 extern int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
1087                                       void *data, struct drm_file *file_priv);
1088 extern int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
1089                                              struct drm_file *file_priv);
1090 extern int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
1091                                            struct drm_file *file_priv);
1092
1093 extern void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
1094                                  int *bpp);
1095 extern int drm_format_num_planes(uint32_t format);
1096 extern int drm_format_plane_cpp(uint32_t format, int plane);
1097 extern int drm_format_horz_chroma_subsampling(uint32_t format);
1098 extern int drm_format_vert_chroma_subsampling(uint32_t format);
1099 extern const char *drm_get_format_name(uint32_t format);
1100
1101 /* Helpers */
1102
1103 static inline struct drm_plane *drm_plane_find(struct drm_device *dev,
1104                 uint32_t id)
1105 {
1106         struct drm_mode_object *mo;
1107         mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_PLANE);
1108         return mo ? obj_to_plane(mo) : NULL;
1109 }
1110
1111 static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,
1112         uint32_t id)
1113 {
1114         struct drm_mode_object *mo;
1115         mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_CRTC);
1116         return mo ? obj_to_crtc(mo) : NULL;
1117 }
1118
1119 static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev,
1120         uint32_t id)
1121 {
1122         struct drm_mode_object *mo;
1123         mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
1124         return mo ? obj_to_encoder(mo) : NULL;
1125 }
1126
1127 static inline struct drm_connector *drm_connector_find(struct drm_device *dev,
1128                 uint32_t id)
1129 {
1130         struct drm_mode_object *mo;
1131         mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_CONNECTOR);
1132         return mo ? obj_to_connector(mo) : NULL;
1133 }
1134
1135 static inline struct drm_property *drm_property_find(struct drm_device *dev,
1136                 uint32_t id)
1137 {
1138         struct drm_mode_object *mo;
1139         mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_PROPERTY);
1140         return mo ? obj_to_property(mo) : NULL;
1141 }
1142
1143 static inline struct drm_property_blob *
1144 drm_property_blob_find(struct drm_device *dev, uint32_t id)
1145 {
1146         struct drm_mode_object *mo;
1147         mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_BLOB);
1148         return mo ? obj_to_blob(mo) : NULL;
1149 }
1150
1151 /* Plane list iterator for legacy (overlay only) planes. */
1152 #define drm_for_each_legacy_plane(plane, planelist) \
1153         list_for_each_entry(plane, planelist, head) \
1154                 if (plane->type == DRM_PLANE_TYPE_OVERLAY)
1155
1156 #endif /* __DRM_CRTC_H__ */