1 /*
2  * Copyright (C) 2015 Free Electrons
3  * Copyright (C) 2015 NextThing Co
4  *
5  * Maxime Ripard <maxime.ripard@free-electrons.com>
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  */
12 
13 #include <drm/drm_atomic_helper.h>
14 #include <drm/drm_plane_helper.h>
15 #include <drm/drmP.h>
16 
17 #include "sun4i_backend.h"
18 #include "sun4i_frontend.h"
19 #include "sun4i_layer.h"
20 #include "sunxi_engine.h"
21 
22 static void sun4i_backend_layer_reset(struct drm_plane *plane)
23 {
24 	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
25 	struct sun4i_layer_state *state;
26 
27 	if (plane->state) {
28 		state = state_to_sun4i_layer_state(plane->state);
29 
30 		__drm_atomic_helper_plane_destroy_state(&state->state);
31 
32 		kfree(state);
33 		plane->state = NULL;
34 	}
35 
36 	state = kzalloc(sizeof(*state), GFP_KERNEL);
37 	if (state) {
38 		plane->state = &state->state;
39 		plane->state->plane = plane;
40 		plane->state->zpos = layer->id;
41 	}
42 }
43 
44 static struct drm_plane_state *
45 sun4i_backend_layer_duplicate_state(struct drm_plane *plane)
46 {
47 	struct sun4i_layer_state *orig = state_to_sun4i_layer_state(plane->state);
48 	struct sun4i_layer_state *copy;
49 
50 	copy = kzalloc(sizeof(*copy), GFP_KERNEL);
51 	if (!copy)
52 		return NULL;
53 
54 	__drm_atomic_helper_plane_duplicate_state(plane, &copy->state);
55 	copy->uses_frontend = orig->uses_frontend;
56 
57 	return &copy->state;
58 }
59 
60 static void sun4i_backend_layer_destroy_state(struct drm_plane *plane,
61 					      struct drm_plane_state *state)
62 {
63 	struct sun4i_layer_state *s_state = state_to_sun4i_layer_state(state);
64 
65 	__drm_atomic_helper_plane_destroy_state(state);
66 
67 	kfree(s_state);
68 }
69 
70 static void sun4i_backend_layer_atomic_disable(struct drm_plane *plane,
71 					       struct drm_plane_state *old_state)
72 {
73 	struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(old_state);
74 	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
75 	struct sun4i_backend *backend = layer->backend;
76 
77 	sun4i_backend_layer_enable(backend, layer->id, false);
78 
79 	if (layer_state->uses_frontend) {
80 		unsigned long flags;
81 
82 		spin_lock_irqsave(&backend->frontend_lock, flags);
83 		backend->frontend_teardown = true;
84 		spin_unlock_irqrestore(&backend->frontend_lock, flags);
85 	}
86 }
87 
88 static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
89 					      struct drm_plane_state *old_state)
90 {
91 	struct sun4i_layer_state *layer_state = state_to_sun4i_layer_state(plane->state);
92 	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
93 	struct sun4i_backend *backend = layer->backend;
94 	struct sun4i_frontend *frontend = backend->frontend;
95 
96 	if (layer_state->uses_frontend) {
97 		sun4i_frontend_init(frontend);
98 		sun4i_frontend_update_coord(frontend, plane);
99 		sun4i_frontend_update_buffer(frontend, plane);
100 		sun4i_frontend_update_formats(frontend, plane,
101 					      DRM_FORMAT_ARGB8888);
102 		sun4i_backend_update_layer_frontend(backend, layer->id,
103 						    DRM_FORMAT_ARGB8888);
104 		sun4i_frontend_enable(frontend);
105 	} else {
106 		sun4i_backend_update_layer_formats(backend, layer->id, plane);
107 		sun4i_backend_update_layer_buffer(backend, layer->id, plane);
108 	}
109 
110 	sun4i_backend_update_layer_coord(backend, layer->id, plane);
111 	sun4i_backend_update_layer_zpos(backend, layer->id, plane);
112 	sun4i_backend_layer_enable(backend, layer->id, true);
113 }
114 
115 static const struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
116 	.atomic_disable	= sun4i_backend_layer_atomic_disable,
117 	.atomic_update	= sun4i_backend_layer_atomic_update,
118 };
119 
120 static const struct drm_plane_funcs sun4i_backend_layer_funcs = {
121 	.atomic_destroy_state	= sun4i_backend_layer_destroy_state,
122 	.atomic_duplicate_state	= sun4i_backend_layer_duplicate_state,
123 	.destroy		= drm_plane_cleanup,
124 	.disable_plane		= drm_atomic_helper_disable_plane,
125 	.reset			= sun4i_backend_layer_reset,
126 	.update_plane		= drm_atomic_helper_update_plane,
127 };
128 
129 static const uint32_t sun4i_backend_layer_formats[] = {
130 	DRM_FORMAT_ARGB8888,
131 	DRM_FORMAT_ARGB4444,
132 	DRM_FORMAT_ARGB1555,
133 	DRM_FORMAT_RGBA5551,
134 	DRM_FORMAT_RGBA4444,
135 	DRM_FORMAT_RGB888,
136 	DRM_FORMAT_RGB565,
137 	DRM_FORMAT_XRGB8888,
138 };
139 
140 static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
141 						struct sun4i_backend *backend,
142 						enum drm_plane_type type)
143 {
144 	struct sun4i_layer *layer;
145 	int ret;
146 
147 	layer = devm_kzalloc(drm->dev, sizeof(*layer), GFP_KERNEL);
148 	if (!layer)
149 		return ERR_PTR(-ENOMEM);
150 
151 	/* possible crtcs are set later */
152 	ret = drm_universal_plane_init(drm, &layer->plane, 0,
153 				       &sun4i_backend_layer_funcs,
154 				       sun4i_backend_layer_formats,
155 				       ARRAY_SIZE(sun4i_backend_layer_formats),
156 				       NULL, type, NULL);
157 	if (ret) {
158 		dev_err(drm->dev, "Couldn't initialize layer\n");
159 		return ERR_PTR(ret);
160 	}
161 
162 	drm_plane_helper_add(&layer->plane,
163 			     &sun4i_backend_layer_helper_funcs);
164 	layer->backend = backend;
165 
166 	drm_plane_create_zpos_property(&layer->plane, 0, 0,
167 				       SUN4I_BACKEND_NUM_LAYERS - 1);
168 
169 	return layer;
170 }
171 
172 struct drm_plane **sun4i_layers_init(struct drm_device *drm,
173 				     struct sunxi_engine *engine)
174 {
175 	struct drm_plane **planes;
176 	struct sun4i_backend *backend = engine_to_sun4i_backend(engine);
177 	int i;
178 
179 	/* We need to have a sentinel at the need, hence the overallocation */
180 	planes = devm_kcalloc(drm->dev, SUN4I_BACKEND_NUM_LAYERS + 1,
181 			      sizeof(*planes), GFP_KERNEL);
182 	if (!planes)
183 		return ERR_PTR(-ENOMEM);
184 
185 	for (i = 0; i < SUN4I_BACKEND_NUM_LAYERS; i++) {
186 		enum drm_plane_type type = i ? DRM_PLANE_TYPE_OVERLAY : DRM_PLANE_TYPE_PRIMARY;
187 		struct sun4i_layer *layer;
188 
189 		layer = sun4i_layer_init_one(drm, backend, type);
190 		if (IS_ERR(layer)) {
191 			dev_err(drm->dev, "Couldn't initialize %s plane\n",
192 				i ? "overlay" : "primary");
193 			return ERR_CAST(layer);
194 		};
195 
196 		layer->id = i;
197 		planes[i] = &layer->plane;
198 	};
199 
200 	return planes;
201 }
202