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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
62Atomic State Reset and Initialization
63-------------------------------------
64
65.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
66 :doc: atomic state reset and initialization
67
68Helper Functions Reference
69--------------------------
70
71.. kernel-doc:: include/drm/drm_atomic_helper.h
72 :internal:
73
74.. kernel-doc:: drivers/gpu/drm/drm_atomic_helper.c
75 :export:
76
77Simple KMS Helper Reference
78===========================
79
80.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
81 :doc: overview
82
83.. kernel-doc:: include/drm/drm_simple_kms_helper.h
84 :internal:
85
86.. kernel-doc:: drivers/gpu/drm/drm_simple_kms_helper.c
87 :export:
88
89fbdev Helper Functions Reference
90================================
91
92.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
93 :doc: fbdev helpers
94
95.. kernel-doc:: include/drm/drm_fb_helper.h
96 :internal:
97
98.. kernel-doc:: drivers/gpu/drm/drm_fb_helper.c
99 :export:
100
101Framebuffer CMA Helper Functions Reference
102==========================================
103
104.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c
105 :doc: framebuffer cma helper functions
106
107.. kernel-doc:: drivers/gpu/drm/drm_fb_cma_helper.c
108 :export:
109
110.. _drm_bridges:
111
112Bridges
113=======
114
115Overview
116--------
117
118.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
119 :doc: overview
120
121Default bridge callback sequence
122--------------------------------
123
124.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
125 :doc: bridge callbacks
126
127
128Bridge Helper Reference
129-------------------------
130
131.. kernel-doc:: include/drm/drm_bridge.h
132 :internal:
133
134.. kernel-doc:: drivers/gpu/drm/drm_bridge.c
135 :export:
136
137Panel-Bridge Helper Reference
138-----------------------------
139
140.. kernel-doc:: drivers/gpu/drm/bridge/panel.c
141 :export:
142
143.. _drm_panel_helper:
144
145Panel Helper Reference
146======================
147
148.. kernel-doc:: drivers/gpu/drm/drm_panel.c
149 :doc: drm panel
150
151.. kernel-doc:: include/drm/drm_panel.h
152 :internal:
153
154.. kernel-doc:: drivers/gpu/drm/drm_panel.c
155 :export:
156
157.. kernel-doc:: drivers/gpu/drm/drm_panel_orientation_quirks.c
158 :export:
159
160Display Port Helper Functions Reference
161=======================================
162
163.. kernel-doc:: drivers/gpu/drm/drm_dp_helper.c
164 :doc: dp helpers
165
166.. kernel-doc:: include/drm/drm_dp_helper.h
167 :internal:
168
169.. kernel-doc:: drivers/gpu/drm/drm_dp_helper.c
170 :export:
171
172Display Port Dual Mode Adaptor Helper Functions Reference
173=========================================================
174
175.. kernel-doc:: drivers/gpu/drm/drm_dp_dual_mode_helper.c
176 :doc: dp dual mode helpers
177
178.. kernel-doc:: include/drm/drm_dp_dual_mode_helper.h
179 :internal:
180
181.. kernel-doc:: drivers/gpu/drm/drm_dp_dual_mode_helper.c
182 :export:
183
184Display Port MST Helper Functions Reference
185===========================================
186
187.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c
188 :doc: dp mst helper
189
190.. kernel-doc:: include/drm/drm_dp_mst_helper.h
191 :internal:
192
193.. kernel-doc:: drivers/gpu/drm/drm_dp_mst_topology.c
194 :export:
195
196MIPI DSI Helper Functions Reference
197===================================
198
199.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
200 :doc: dsi helpers
201
202.. kernel-doc:: include/drm/drm_mipi_dsi.h
203 :internal:
204
205.. kernel-doc:: drivers/gpu/drm/drm_mipi_dsi.c
206 :export:
207
208Output Probing Helper Functions Reference
209=========================================
210
211.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
212 :doc: output probing helper overview
213
214.. kernel-doc:: drivers/gpu/drm/drm_probe_helper.c
215 :export:
216
217EDID Helper Functions Reference
218===============================
219
220.. kernel-doc:: include/drm/drm_edid.h
221 :internal:
222
223.. kernel-doc:: drivers/gpu/drm/drm_edid.c
224 :export:
225
226SCDC Helper Functions Reference
227===============================
228
229.. kernel-doc:: drivers/gpu/drm/drm_scdc_helper.c
230 :doc: scdc helpers
231
232.. kernel-doc:: include/drm/drm_scdc_helper.h
233 :internal:
234
235.. kernel-doc:: drivers/gpu/drm/drm_scdc_helper.c
236 :export:
237
238Rectangle Utilities Reference
239=============================
240
241.. kernel-doc:: include/drm/drm_rect.h
242 :doc: rect utils
243
244.. kernel-doc:: include/drm/drm_rect.h
245 :internal:
246
247.. kernel-doc:: drivers/gpu/drm/drm_rect.c
248 :export:
249
250HDMI Infoframes Helper Reference
251================================
252
253Strictly speaking this is not a DRM helper library but generally useable
254by any driver interfacing with HDMI outputs like v4l or alsa drivers.
255But it nicely fits into the overall topic of mode setting helper
256libraries and hence is also included here.
257
258.. kernel-doc:: include/linux/hdmi.h
259 :internal:
260
261.. kernel-doc:: drivers/video/hdmi.c
262 :export:
263
264Flip-work Helper Reference
265==========================
266
267.. kernel-doc:: include/drm/drm_flip_work.h
268 :doc: flip utils
269
270.. kernel-doc:: include/drm/drm_flip_work.h
271 :internal:
272
273.. kernel-doc:: drivers/gpu/drm/drm_flip_work.c
274 :export:
275
276Auxiliary Modeset Helpers
277=========================
278
279.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
280 :doc: aux kms helpers
281
282.. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
283 :export:
284
285Framebuffer GEM Helper Reference
286================================
287
288.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c
289 :doc: overview
290
291.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c
292 :export:
293
294Legacy Plane Helper Reference
295=============================
296
297.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
298 :doc: overview
299
300.. kernel-doc:: drivers/gpu/drm/drm_plane_helper.c
301 :export:
302
303Legacy CRTC/Modeset Helper Functions Reference
304==============================================
305
306.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
307 :doc: overview
308
309.. kernel-doc:: drivers/gpu/drm/drm_crtc_helper.c
310 :export: