Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.io>
4 */
5
6#ifndef _SUNXI_ENGINE_H_
7#define _SUNXI_ENGINE_H_
8
9struct drm_plane;
10struct drm_crtc;
11struct drm_device;
12struct drm_crtc_state;
13struct drm_display_mode;
14
15struct sunxi_engine;
16
17/**
18 * struct sunxi_engine_ops - helper operations for sunXi engines
19 *
20 * These hooks are used by the common part of the DRM driver to
21 * implement the proper behaviour.
22 */
23struct sunxi_engine_ops {
24 /**
25 * @atomic_begin:
26 *
27 * This callback allows to prepare our engine for an atomic
28 * update. This is mirroring the
29 * &drm_crtc_helper_funcs.atomic_begin callback, so any
30 * documentation there applies.
31 *
32 * This function is optional.
33 */
34 void (*atomic_begin)(struct sunxi_engine *engine,
35 struct drm_crtc_state *old_state);
36
37 /**
38 * @atomic_check:
39 *
40 * This callback allows to validate plane-update related CRTC
41 * constraints specific to engines. This is mirroring the
42 * &drm_crtc_helper_funcs.atomic_check callback, so any
43 * documentation there applies.
44 *
45 * This function is optional.
46 *
47 * RETURNS:
48 *
49 * 0 on success or a negative error code.
50 */
51 int (*atomic_check)(struct sunxi_engine *engine,
52 struct drm_crtc_state *state);
53
54 /**
55 * @commit:
56 *
57 * This callback will trigger the hardware switch to commit
58 * the new configuration that has been setup during the next
59 * vblank period.
60 *
61 * This function is optional.
62 */
63 void (*commit)(struct sunxi_engine *engine,
64 struct drm_crtc *crtc,
65 struct drm_atomic_state *state);
66
67 /**
68 * @layers_init:
69 *
70 * This callback is used to allocate, initialize and register
71 * the layers supported by that engine.
72 *
73 * This function is mandatory.
74 *
75 * RETURNS:
76 *
77 * The array of struct drm_plane backing the layers, or an
78 * error pointer on failure.
79 */
80 struct drm_plane **(*layers_init)(struct drm_device *drm,
81 struct sunxi_engine *engine);
82
83 /**
84 * @apply_color_correction:
85 *
86 * This callback will enable the color correction in the
87 * engine. This is useful only for the composite output.
88 *
89 * This function is optional.
90 */
91 void (*apply_color_correction)(struct sunxi_engine *engine);
92
93 /**
94 * @disable_color_correction:
95 *
96 * This callback will stop the color correction in the
97 * engine. This is useful only for the composite output.
98 *
99 * This function is optional.
100 */
101 void (*disable_color_correction)(struct sunxi_engine *engine);
102
103 /**
104 * @vblank_quirk:
105 *
106 * This callback is used to implement engine-specific
107 * behaviour part of the VBLANK event. It is run with all the
108 * constraints of an interrupt (can't sleep, all local
109 * interrupts disabled) and therefore should be as fast as
110 * possible.
111 *
112 * This function is optional.
113 */
114 void (*vblank_quirk)(struct sunxi_engine *engine);
115
116 /**
117 * @mode_set:
118 *
119 * This callback is used to set mode related parameters
120 * like interlacing, screen size, etc. once per mode set.
121 *
122 * This function is optional.
123 */
124 void (*mode_set)(struct sunxi_engine *engine,
125 const struct drm_display_mode *mode);
126};
127
128/**
129 * struct sunxi_engine - the common parts of an engine for sun4i-drm driver
130 * @ops: the operations of the engine
131 * @node: the of device node of the engine
132 * @regs: the regmap of the engine
133 * @id: the id of the engine (-1 if not used)
134 * @list: engine list management
135 */
136struct sunxi_engine {
137 const struct sunxi_engine_ops *ops;
138
139 struct device_node *node;
140 struct regmap *regs;
141
142 int id;
143
144 struct list_head list;
145};
146
147/**
148 * sunxi_engine_commit() - commit all changes of the engine
149 * @engine: pointer to the engine
150 * @crtc: pointer to crtc the engine is associated with
151 * @state: atomic state
152 */
153static inline void
154sunxi_engine_commit(struct sunxi_engine *engine,
155 struct drm_crtc *crtc,
156 struct drm_atomic_state *state)
157{
158 if (engine->ops && engine->ops->commit)
159 engine->ops->commit(engine, crtc, state);
160}
161
162/**
163 * sunxi_engine_layers_init() - Create planes (layers) for the engine
164 * @drm: pointer to the drm_device for which planes will be created
165 * @engine: pointer to the engine
166 *
167 * Returns: The array of struct drm_plane backing the layers, or an
168 * error pointer on failure.
169 */
170static inline struct drm_plane **
171sunxi_engine_layers_init(struct drm_device *drm, struct sunxi_engine *engine)
172{
173 if (engine->ops && engine->ops->layers_init)
174 return engine->ops->layers_init(drm, engine);
175 return ERR_PTR(-ENOSYS);
176}
177
178/**
179 * sunxi_engine_apply_color_correction - Apply the RGB2YUV color correction
180 * @engine: pointer to the engine
181 *
182 * This functionality is optional for an engine, however, if the engine is
183 * intended to be used with TV Encoder, the output will be incorrect
184 * without the color correction, due to TV Encoder expects the engine to
185 * output directly YUV signal.
186 */
187static inline void
188sunxi_engine_apply_color_correction(struct sunxi_engine *engine)
189{
190 if (engine->ops && engine->ops->apply_color_correction)
191 engine->ops->apply_color_correction(engine);
192}
193
194/**
195 * sunxi_engine_disable_color_correction - Disable the color space correction
196 * @engine: pointer to the engine
197 *
198 * This function is paired with apply_color_correction().
199 */
200static inline void
201sunxi_engine_disable_color_correction(struct sunxi_engine *engine)
202{
203 if (engine->ops && engine->ops->disable_color_correction)
204 engine->ops->disable_color_correction(engine);
205}
206
207/**
208 * sunxi_engine_mode_set - Inform engine of a new mode
209 * @engine: pointer to the engine
210 * @mode: new mode
211 *
212 * Engine can use this functionality to set specifics once per mode change.
213 */
214static inline void
215sunxi_engine_mode_set(struct sunxi_engine *engine,
216 const struct drm_display_mode *mode)
217{
218 if (engine->ops && engine->ops->mode_set)
219 engine->ops->mode_set(engine, mode);
220}
221#endif /* _SUNXI_ENGINE_H_ */