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