1============================= 2Mode Setting Helper Functions 3============================= 4 5The DRM subsystem aims for a strong separation between core code and helper 6libraries. Core code takes care of general setup and teardown and decoding 7userspace requests to kernel internal objects. Everything else is handled by a 8large set of helper libraries, which can be combined freely to pick and choose 9for each driver what fits, and avoid shared code where special behaviour is 10needed. 11 12This distinction between core code and helpers is especially strong in the 13modesetting code, where there's a shared userspace ABI for all drivers. This is 14in contrast to the render side, where pretty much everything (with very few 15exceptions) can be considered optional helper code. 16 17There are a few areas these helpers can grouped into: 18 19* Helpers to implement modesetting. The important ones here are the atomic 20 helpers. Old drivers still often use the legacy CRTC helpers. They both share 21 the same set of common helper vtables. For really simple drivers (anything 22 that would have been a great fit in the deprecated fbdev subsystem) there's 23 also the simple display pipe helpers. 24 25* There's a big pile of helpers for handling outputs. First the generic bridge 26 helpers for handling encoder and transcoder IP blocks. Second the panel helpers 27 for handling panel-related information and logic. Plus then a big set of 28 helpers for the various sink standards (DisplayPort, HDMI, MIPI DSI). Finally 29 there's also generic helpers for handling output probing, and for dealing with 30 EDIDs. 31 32* The last group of helpers concerns itself with the frontend side of a display 33 pipeline: Planes, handling rectangles for visibility checking and scissoring, 34 flip queues and assorted bits. 35 36Modeset Helper Reference for Common Vtables 37=========================================== 38 39.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h 40 :doc: overview 41 42.. kernel-doc:: include/drm/drm_modeset_helper_vtables.h 43 :internal: 44 45.. _drm_atomic_helper: 46 47Atomic Modeset Helper Functions Reference 48========================================= 49 50Overview 51-------- 52 53.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c 54 :doc: overview 55 56Implementing Asynchronous Atomic Commit 57--------------------------------------- 58 59.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c 60 :doc: implementing nonblocking commit 61 62Helper Functions Reference 63-------------------------- 64 65.. kernel-doc:: include/drm/drm_atomic_helper.h 66 :internal: 67 68.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c 69 :export: 70 71Atomic State Reset and Initialization 72------------------------------------- 73 74.. kernel-doc:: drivers/gpu/drm/drm_atomic_state_helper.c 75 :doc: atomic state reset and initialization 76 77Atomic State Helper Reference 78----------------------------- 79 80.. kernel-doc:: drivers/gpu/drm/drm_atomic_state_helper.c 81 :export: 82 83GEM Atomic Helper Reference 84--------------------------- 85 86.. kernel-doc:: drivers/gpu/drm/drm_gem_atomic_helper.c 87 :doc: overview 88 89.. kernel-doc:: include/drm/drm_gem_atomic_helper.h 90 :internal: 91 92.. kernel-doc:: drivers/gpu/drm/drm_gem_atomic_helper.c 93 :export: 94 95Simple KMS Helper Reference 96=========================== 97 98.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c 99 :doc: overview 100 101.. kernel-doc:: include/drm/drm_simple_kms_helper.h 102 :internal: 103 104.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c 105 :export: 106 107fbdev Helper Functions Reference 108================================ 109 110.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c 111 :doc: fbdev helpers 112 113.. kernel-doc:: drivers/gpu/drm/drm_fbdev_dma.c 114 :export: 115 116.. kernel-doc:: drivers/gpu/drm/drm_fbdev_shmem.c 117 :export: 118 119.. kernel-doc:: drivers/gpu/drm/drm_fbdev_ttm.c 120 :export: 121 122.. kernel-doc:: include/drm/drm_fb_helper.h 123 :internal: 124 125.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c 126 :export: 127 128format Helper Functions Reference 129================================= 130 131.. kernel-doc:: drivers/gpu/drm/drm_format_helper.c 132 :export: 133 134Framebuffer DMA Helper Functions Reference 135========================================== 136 137.. kernel-doc:: drivers/gpu/drm/drm_fb_dma_helper.c 138 :doc: framebuffer dma helper functions 139 140.. kernel-doc:: drivers/gpu/drm/drm_fb_dma_helper.c 141 :export: 142 143Framebuffer GEM Helper Reference 144================================ 145 146.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c 147 :doc: overview 148 149.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c 150 :export: 151 152.. _drm_bridges: 153 154Bridges 155======= 156 157Overview 158-------- 159 160.. kernel-doc:: drivers/gpu/drm/drm_bridge.c 161 :doc: overview 162 163Display Driver Integration 164-------------------------- 165 166.. kernel-doc:: drivers/gpu/drm/drm_bridge.c 167 :doc: display driver integration 168 169Special Care with MIPI-DSI bridges 170---------------------------------- 171 172.. kernel-doc:: drivers/gpu/drm/drm_bridge.c 173 :doc: special care dsi 174 175Bridge Operations 176----------------- 177 178.. kernel-doc:: drivers/gpu/drm/drm_bridge.c 179 :doc: bridge operations 180 181Bridge Connector Helper 182----------------------- 183 184.. kernel-doc:: drivers/gpu/drm/display/drm_bridge_connector.c 185 :doc: overview 186 187 188Bridge Helper Reference 189------------------------- 190 191.. kernel-doc:: include/drm/drm_bridge.h 192 :internal: 193 194.. kernel-doc:: drivers/gpu/drm/drm_bridge.c 195 :export: 196 197MIPI-DSI bridge operation 198------------------------- 199 200.. kernel-doc:: drivers/gpu/drm/drm_bridge.c 201 :doc: dsi bridge operations 202 203 204Bridge Connector Helper Reference 205--------------------------------- 206 207.. kernel-doc:: drivers/gpu/drm/display/drm_bridge_connector.c 208 :export: 209 210Panel-Bridge Helper Reference 211----------------------------- 212 213.. kernel-doc:: drivers/gpu/drm/bridge/panel.c 214 :export: 215 216.. _drm_panel_helper: 217 218Panel Helper Reference 219====================== 220 221.. kernel-doc:: drivers/gpu/drm/drm_panel.c 222 :doc: drm panel 223 224.. kernel-doc:: include/drm/drm_panel.h 225 :internal: 226 227.. kernel-doc:: drivers/gpu/drm/drm_panel.c 228 :export: 229 230.. kernel-doc:: drivers/gpu/drm/drm_panel_orientation_quirks.c 231 :export: 232 233Panel Self Refresh Helper Reference 234=================================== 235 236.. kernel-doc:: drivers/gpu/drm/drm_self_refresh_helper.c 237 :doc: overview 238 239.. kernel-doc:: drivers/gpu/drm/drm_self_refresh_helper.c 240 :export: 241 242HDCP Helper Functions Reference 243=============================== 244 245.. kernel-doc:: drivers/gpu/drm/display/drm_hdcp_helper.c 246 :export: 247 248Display Port Helper Functions Reference 249======================================= 250 251.. kernel-doc:: drivers/gpu/drm/display/drm_dp_helper.c 252 :doc: dp helpers 253 254.. kernel-doc:: include/drm/display/drm_dp.h 255 :internal: 256 257.. kernel-doc:: include/drm/display/drm_dp_helper.h 258 :internal: 259 260.. kernel-doc:: drivers/gpu/drm/display/drm_dp_helper.c 261 :export: 262 263Display Port CEC Helper Functions Reference 264=========================================== 265 266.. kernel-doc:: drivers/gpu/drm/display/drm_dp_cec.c 267 :doc: dp cec helpers 268 269.. kernel-doc:: drivers/gpu/drm/display/drm_dp_cec.c 270 :export: 271 272Display Port Dual Mode Adaptor Helper Functions Reference 273========================================================= 274 275.. kernel-doc:: drivers/gpu/drm/display/drm_dp_dual_mode_helper.c 276 :doc: dp dual mode helpers 277 278.. kernel-doc:: include/drm/display/drm_dp_dual_mode_helper.h 279 :internal: 280 281.. kernel-doc:: drivers/gpu/drm/display/drm_dp_dual_mode_helper.c 282 :export: 283 284Display Port MST Helpers 285======================== 286 287Overview 288-------- 289 290.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c 291 :doc: dp mst helper 292 293.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c 294 :doc: Branch device and port refcounting 295 296Functions Reference 297------------------- 298 299.. kernel-doc:: include/drm/display/drm_dp_mst_helper.h 300 :internal: 301 302.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c 303 :export: 304 305Topology Lifetime Internals 306--------------------------- 307 308These functions aren't exported to drivers, but are documented here to help make 309the MST topology helpers easier to understand 310 311.. kernel-doc:: drivers/gpu/drm/display/drm_dp_mst_topology.c 312 :functions: drm_dp_mst_topology_try_get_mstb drm_dp_mst_topology_get_mstb 313 drm_dp_mst_topology_put_mstb 314 drm_dp_mst_topology_try_get_port drm_dp_mst_topology_get_port 315 drm_dp_mst_topology_put_port 316 drm_dp_mst_get_mstb_malloc drm_dp_mst_put_mstb_malloc 317 318MIPI DBI Helper Functions Reference 319=================================== 320 321.. kernel-doc:: drivers/gpu/drm/drm_mipi_dbi.c 322 :doc: overview 323 324.. kernel-doc:: include/drm/drm_mipi_dbi.h 325 :internal: 326 327.. kernel-doc:: drivers/gpu/drm/drm_mipi_dbi.c 328 :export: 329 330MIPI DSI Helper Functions Reference 331=================================== 332 333.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c 334 :doc: dsi helpers 335 336.. kernel-doc:: include/drm/drm_mipi_dsi.h 337 :internal: 338 339.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c 340 :export: 341 342Display Stream Compression Helper Functions Reference 343===================================================== 344 345.. kernel-doc:: drivers/gpu/drm/display/drm_dsc_helper.c 346 :doc: dsc helpers 347 348.. kernel-doc:: include/drm/display/drm_dsc.h 349 :internal: 350 351.. kernel-doc:: drivers/gpu/drm/display/drm_dsc_helper.c 352 :export: 353 354Output Probing Helper Functions Reference 355========================================= 356 357.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c 358 :doc: output probing helper overview 359 360.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c 361 :export: 362 363EDID Helper Functions Reference 364=============================== 365 366.. kernel-doc:: include/drm/drm_edid.h 367 :internal: 368 369.. kernel-doc:: drivers/gpu/drm/drm_edid.c 370 :export: 371 372.. kernel-doc:: include/drm/drm_eld.h 373 :internal: 374 375.. kernel-doc:: drivers/gpu/drm/drm_eld.c 376 :export: 377 378SCDC Helper Functions Reference 379=============================== 380 381.. kernel-doc:: drivers/gpu/drm/display/drm_scdc_helper.c 382 :doc: scdc helpers 383 384.. kernel-doc:: include/drm/display/drm_scdc_helper.h 385 :internal: 386 387.. kernel-doc:: drivers/gpu/drm/display/drm_scdc_helper.c 388 :export: 389 390HDMI Infoframes Helper Reference 391================================ 392 393Strictly speaking this is not a DRM helper library but generally usable 394by any driver interfacing with HDMI outputs like v4l or alsa drivers. 395But it nicely fits into the overall topic of mode setting helper 396libraries and hence is also included here. 397 398.. kernel-doc:: include/linux/hdmi.h 399 :internal: 400 401.. kernel-doc:: drivers/video/hdmi.c 402 :export: 403 404Rectangle Utilities Reference 405============================= 406 407.. kernel-doc:: include/drm/drm_rect.h 408 :doc: rect utils 409 410.. kernel-doc:: include/drm/drm_rect.h 411 :internal: 412 413.. kernel-doc:: drivers/gpu/drm/drm_rect.c 414 :export: 415 416Flip-work Helper Reference 417========================== 418 419.. kernel-doc:: include/drm/drm_flip_work.h 420 :doc: flip utils 421 422.. kernel-doc:: include/drm/drm_flip_work.h 423 :internal: 424 425.. kernel-doc:: drivers/gpu/drm/drm_flip_work.c 426 :export: 427 428Auxiliary Modeset Helpers 429========================= 430 431.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c 432 :doc: aux kms helpers 433 434.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c 435 :export: 436 437OF/DT Helpers 438============= 439 440.. kernel-doc:: drivers/gpu/drm/drm_of.c 441 :doc: overview 442 443.. kernel-doc:: drivers/gpu/drm/drm_of.c 444 :export: 445 446Legacy Plane Helper Reference 447============================= 448 449.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c 450 :doc: overview 451 452.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c 453 :export: 454 455Legacy CRTC/Modeset Helper Functions Reference 456============================================== 457 458.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c 459 :doc: overview 460 461.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c 462 :export: 463 464Privacy-screen class 465==================== 466 467.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c 468 :doc: overview 469 470.. kernel-doc:: include/drm/drm_privacy_screen_driver.h 471 :internal: 472 473.. kernel-doc:: include/drm/drm_privacy_screen_machine.h 474 :internal: 475 476.. kernel-doc:: drivers/gpu/drm/drm_privacy_screen.c 477 :export: 478