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