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fa201ac2 NT |
1 | /* |
2 | * Copyright (C) 2016 Noralf Trønnes | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <drm/drm_atomic_helper.h> | |
11 | #include <drm/drm_crtc_helper.h> | |
12 | #include <drm/drm_modes.h> | |
13 | #include <drm/tinydrm/tinydrm.h> | |
14 | ||
15 | struct tinydrm_connector { | |
16 | struct drm_connector base; | |
17 | const struct drm_display_mode *mode; | |
18 | }; | |
19 | ||
20 | static inline struct tinydrm_connector * | |
21 | to_tinydrm_connector(struct drm_connector *connector) | |
22 | { | |
23 | return container_of(connector, struct tinydrm_connector, base); | |
24 | } | |
25 | ||
26 | static int tinydrm_connector_get_modes(struct drm_connector *connector) | |
27 | { | |
28 | struct tinydrm_connector *tconn = to_tinydrm_connector(connector); | |
29 | struct drm_display_mode *mode; | |
30 | ||
31 | mode = drm_mode_duplicate(connector->dev, tconn->mode); | |
32 | if (!mode) { | |
33 | DRM_ERROR("Failed to duplicate mode\n"); | |
34 | return 0; | |
35 | } | |
36 | ||
37 | if (mode->name[0] == '\0') | |
38 | drm_mode_set_name(mode); | |
39 | ||
40 | mode->type |= DRM_MODE_TYPE_PREFERRED; | |
41 | drm_mode_probed_add(connector, mode); | |
42 | ||
43 | if (mode->width_mm) { | |
44 | connector->display_info.width_mm = mode->width_mm; | |
45 | connector->display_info.height_mm = mode->height_mm; | |
46 | } | |
47 | ||
48 | return 1; | |
49 | } | |
50 | ||
51 | static const struct drm_connector_helper_funcs tinydrm_connector_hfuncs = { | |
52 | .get_modes = tinydrm_connector_get_modes, | |
53 | .best_encoder = drm_atomic_helper_best_encoder, | |
54 | }; | |
55 | ||
56 | static enum drm_connector_status | |
57 | tinydrm_connector_detect(struct drm_connector *connector, bool force) | |
58 | { | |
59 | if (drm_device_is_unplugged(connector->dev)) | |
60 | return connector_status_disconnected; | |
61 | ||
62 | return connector->status; | |
63 | } | |
64 | ||
65 | static void tinydrm_connector_destroy(struct drm_connector *connector) | |
66 | { | |
67 | struct tinydrm_connector *tconn = to_tinydrm_connector(connector); | |
68 | ||
69 | drm_connector_cleanup(connector); | |
70 | kfree(tconn); | |
71 | } | |
72 | ||
73 | static const struct drm_connector_funcs tinydrm_connector_funcs = { | |
74 | .dpms = drm_atomic_helper_connector_dpms, | |
75 | .reset = drm_atomic_helper_connector_reset, | |
76 | .detect = tinydrm_connector_detect, | |
77 | .fill_modes = drm_helper_probe_single_connector_modes, | |
78 | .destroy = tinydrm_connector_destroy, | |
79 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, | |
80 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, | |
81 | }; | |
82 | ||
83 | struct drm_connector * | |
84 | tinydrm_connector_create(struct drm_device *drm, | |
85 | const struct drm_display_mode *mode, | |
86 | int connector_type) | |
87 | { | |
88 | struct tinydrm_connector *tconn; | |
89 | struct drm_connector *connector; | |
90 | int ret; | |
91 | ||
92 | tconn = kzalloc(sizeof(*tconn), GFP_KERNEL); | |
93 | if (!tconn) | |
94 | return ERR_PTR(-ENOMEM); | |
95 | ||
96 | tconn->mode = mode; | |
97 | connector = &tconn->base; | |
98 | ||
99 | drm_connector_helper_add(connector, &tinydrm_connector_hfuncs); | |
100 | ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs, | |
101 | connector_type); | |
102 | if (ret) { | |
103 | kfree(tconn); | |
104 | return ERR_PTR(ret); | |
105 | } | |
106 | ||
107 | connector->status = connector_status_connected; | |
108 | ||
109 | return connector; | |
110 | } | |
111 | ||
112 | /** | |
113 | * tinydrm_display_pipe_update - Display pipe update helper | |
114 | * @pipe: Simple display pipe | |
115 | * @old_state: Old plane state | |
116 | * | |
117 | * This function does a full framebuffer flush if the plane framebuffer | |
118 | * has changed. It also handles vblank events. Drivers can use this as their | |
119 | * &drm_simple_display_pipe_funcs->update callback. | |
120 | */ | |
121 | void tinydrm_display_pipe_update(struct drm_simple_display_pipe *pipe, | |
122 | struct drm_plane_state *old_state) | |
123 | { | |
124 | struct tinydrm_device *tdev = pipe_to_tinydrm(pipe); | |
125 | struct drm_framebuffer *fb = pipe->plane.state->fb; | |
126 | struct drm_crtc *crtc = &tdev->pipe.crtc; | |
127 | ||
128 | if (fb && (fb != old_state->fb)) { | |
129 | pipe->plane.fb = fb; | |
130 | if (fb->funcs->dirty) | |
131 | fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0); | |
132 | } | |
133 | ||
134 | if (crtc->state->event) { | |
135 | spin_lock_irq(&crtc->dev->event_lock); | |
136 | drm_crtc_send_vblank_event(crtc, crtc->state->event); | |
137 | spin_unlock_irq(&crtc->dev->event_lock); | |
138 | crtc->state->event = NULL; | |
139 | } | |
140 | } | |
141 | EXPORT_SYMBOL(tinydrm_display_pipe_update); | |
142 | ||
143 | /** | |
144 | * tinydrm_display_pipe_prepare_fb - Display pipe prepare_fb helper | |
145 | * @pipe: Simple display pipe | |
146 | * @plane_state: Plane state | |
147 | * | |
148 | * This function uses drm_fb_cma_prepare_fb() to check if the plane FB has an | |
149 | * dma-buf attached, extracts the exclusive fence and attaches it to plane | |
150 | * state for the atomic helper to wait on. Drivers can use this as their | |
151 | * &drm_simple_display_pipe_funcs->prepare_fb callback. | |
152 | */ | |
153 | int tinydrm_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe, | |
154 | struct drm_plane_state *plane_state) | |
155 | { | |
156 | return drm_fb_cma_prepare_fb(&pipe->plane, plane_state); | |
157 | } | |
158 | EXPORT_SYMBOL(tinydrm_display_pipe_prepare_fb); | |
159 | ||
160 | static int tinydrm_rotate_mode(struct drm_display_mode *mode, | |
161 | unsigned int rotation) | |
162 | { | |
163 | if (rotation == 0 || rotation == 180) { | |
164 | return 0; | |
165 | } else if (rotation == 90 || rotation == 270) { | |
166 | swap(mode->hdisplay, mode->vdisplay); | |
167 | swap(mode->hsync_start, mode->vsync_start); | |
168 | swap(mode->hsync_end, mode->vsync_end); | |
169 | swap(mode->htotal, mode->vtotal); | |
170 | swap(mode->width_mm, mode->height_mm); | |
171 | return 0; | |
172 | } else { | |
173 | return -EINVAL; | |
174 | } | |
175 | } | |
176 | ||
177 | /** | |
178 | * tinydrm_display_pipe_init - Initialize display pipe | |
179 | * @tdev: tinydrm device | |
180 | * @funcs: Display pipe functions | |
181 | * @connector_type: Connector type | |
182 | * @formats: Array of supported formats (DRM_FORMAT\_\*) | |
183 | * @format_count: Number of elements in @formats | |
184 | * @mode: Supported mode | |
185 | * @rotation: Initial @mode rotation in degrees Counter Clock Wise | |
186 | * | |
187 | * This function sets up a &drm_simple_display_pipe with a &drm_connector that | |
188 | * has one fixed &drm_display_mode which is rotated according to @rotation. | |
189 | * | |
190 | * Returns: | |
191 | * Zero on success, negative error code on failure. | |
192 | */ | |
193 | int | |
194 | tinydrm_display_pipe_init(struct tinydrm_device *tdev, | |
195 | const struct drm_simple_display_pipe_funcs *funcs, | |
196 | int connector_type, | |
197 | const uint32_t *formats, | |
198 | unsigned int format_count, | |
199 | const struct drm_display_mode *mode, | |
200 | unsigned int rotation) | |
201 | { | |
202 | struct drm_device *drm = tdev->drm; | |
203 | struct drm_display_mode *mode_copy; | |
204 | struct drm_connector *connector; | |
205 | int ret; | |
206 | ||
207 | mode_copy = devm_kmalloc(drm->dev, sizeof(*mode_copy), GFP_KERNEL); | |
208 | if (!mode_copy) | |
209 | return -ENOMEM; | |
210 | ||
211 | *mode_copy = *mode; | |
212 | ret = tinydrm_rotate_mode(mode_copy, rotation); | |
213 | if (ret) { | |
214 | DRM_ERROR("Illegal rotation value %u\n", rotation); | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | drm->mode_config.min_width = mode_copy->hdisplay; | |
219 | drm->mode_config.max_width = mode_copy->hdisplay; | |
220 | drm->mode_config.min_height = mode_copy->vdisplay; | |
221 | drm->mode_config.max_height = mode_copy->vdisplay; | |
222 | ||
223 | connector = tinydrm_connector_create(drm, mode_copy, connector_type); | |
224 | if (IS_ERR(connector)) | |
225 | return PTR_ERR(connector); | |
226 | ||
227 | ret = drm_simple_display_pipe_init(drm, &tdev->pipe, funcs, formats, | |
e6fc3b68 | 228 | format_count, NULL, connector); |
fa201ac2 NT |
229 | if (ret) |
230 | return ret; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | EXPORT_SYMBOL(tinydrm_display_pipe_init); |