Loading...
1/*
2 * Copyright (C) 2015 Broadcom
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 version 2 as
6 * published by the Free Software Foundation.
7 */
8
9/**
10 * DOC: VC4 KMS
11 *
12 * This is the general code for implementing KMS mode setting that
13 * doesn't clearly associate with any of the other objects (plane,
14 * crtc, HDMI encoder).
15 */
16
17#include "drm_crtc.h"
18#include "drm_atomic.h"
19#include "drm_atomic_helper.h"
20#include "drm_crtc_helper.h"
21#include "drm_plane_helper.h"
22#include "drm_fb_cma_helper.h"
23#include "vc4_drv.h"
24
25static void vc4_output_poll_changed(struct drm_device *dev)
26{
27 struct vc4_dev *vc4 = to_vc4_dev(dev);
28
29 if (vc4->fbdev)
30 drm_fbdev_cma_hotplug_event(vc4->fbdev);
31}
32
33struct vc4_commit {
34 struct drm_device *dev;
35 struct drm_atomic_state *state;
36 struct vc4_seqno_cb cb;
37};
38
39static void
40vc4_atomic_complete_commit(struct vc4_commit *c)
41{
42 struct drm_atomic_state *state = c->state;
43 struct drm_device *dev = state->dev;
44 struct vc4_dev *vc4 = to_vc4_dev(dev);
45
46 drm_atomic_helper_commit_modeset_disables(dev, state);
47
48 drm_atomic_helper_commit_planes(dev, state, false);
49
50 drm_atomic_helper_commit_modeset_enables(dev, state);
51
52 /* Make sure that drm_atomic_helper_wait_for_vblanks()
53 * actually waits for vblank. If we're doing a full atomic
54 * modeset (as opposed to a vc4_update_plane() short circuit),
55 * then we need to wait for scanout to be done with our
56 * display lists before we free it and potentially reallocate
57 * and overwrite the dlist memory with a new modeset.
58 */
59 state->legacy_cursor_update = false;
60
61 drm_atomic_helper_wait_for_vblanks(dev, state);
62
63 drm_atomic_helper_cleanup_planes(dev, state);
64
65 drm_atomic_state_free(state);
66
67 up(&vc4->async_modeset);
68
69 kfree(c);
70}
71
72static void
73vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb)
74{
75 struct vc4_commit *c = container_of(cb, struct vc4_commit, cb);
76
77 vc4_atomic_complete_commit(c);
78}
79
80static struct vc4_commit *commit_init(struct drm_atomic_state *state)
81{
82 struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
83
84 if (!c)
85 return NULL;
86 c->dev = state->dev;
87 c->state = state;
88
89 return c;
90}
91
92/**
93 * vc4_atomic_commit - commit validated state object
94 * @dev: DRM device
95 * @state: the driver state object
96 * @async: asynchronous commit
97 *
98 * This function commits a with drm_atomic_helper_check() pre-validated state
99 * object. This can still fail when e.g. the framebuffer reservation fails. For
100 * now this doesn't implement asynchronous commits.
101 *
102 * RETURNS
103 * Zero for success or -errno.
104 */
105static int vc4_atomic_commit(struct drm_device *dev,
106 struct drm_atomic_state *state,
107 bool async)
108{
109 struct vc4_dev *vc4 = to_vc4_dev(dev);
110 int ret;
111 int i;
112 uint64_t wait_seqno = 0;
113 struct vc4_commit *c;
114
115 c = commit_init(state);
116 if (!c)
117 return -ENOMEM;
118
119 /* Make sure that any outstanding modesets have finished. */
120 ret = down_interruptible(&vc4->async_modeset);
121 if (ret) {
122 kfree(c);
123 return ret;
124 }
125
126 ret = drm_atomic_helper_prepare_planes(dev, state);
127 if (ret) {
128 kfree(c);
129 up(&vc4->async_modeset);
130 return ret;
131 }
132
133 for (i = 0; i < dev->mode_config.num_total_plane; i++) {
134 struct drm_plane *plane = state->planes[i];
135 struct drm_plane_state *new_state = state->plane_states[i];
136
137 if (!plane)
138 continue;
139
140 if ((plane->state->fb != new_state->fb) && new_state->fb) {
141 struct drm_gem_cma_object *cma_bo =
142 drm_fb_cma_get_gem_obj(new_state->fb, 0);
143 struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
144
145 wait_seqno = max(bo->seqno, wait_seqno);
146 }
147 }
148
149 /*
150 * This is the point of no return - everything below never fails except
151 * when the hw goes bonghits. Which means we can commit the new state on
152 * the software side now.
153 */
154
155 drm_atomic_helper_swap_state(dev, state);
156
157 /*
158 * Everything below can be run asynchronously without the need to grab
159 * any modeset locks at all under one condition: It must be guaranteed
160 * that the asynchronous work has either been cancelled (if the driver
161 * supports it, which at least requires that the framebuffers get
162 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
163 * before the new state gets committed on the software side with
164 * drm_atomic_helper_swap_state().
165 *
166 * This scheme allows new atomic state updates to be prepared and
167 * checked in parallel to the asynchronous completion of the previous
168 * update. Which is important since compositors need to figure out the
169 * composition of the next frame right after having submitted the
170 * current layout.
171 */
172
173 if (async) {
174 vc4_queue_seqno_cb(dev, &c->cb, wait_seqno,
175 vc4_atomic_complete_commit_seqno_cb);
176 } else {
177 vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false);
178 vc4_atomic_complete_commit(c);
179 }
180
181 return 0;
182}
183
184static const struct drm_mode_config_funcs vc4_mode_funcs = {
185 .output_poll_changed = vc4_output_poll_changed,
186 .atomic_check = drm_atomic_helper_check,
187 .atomic_commit = vc4_atomic_commit,
188 .fb_create = drm_fb_cma_create,
189};
190
191int vc4_kms_load(struct drm_device *dev)
192{
193 struct vc4_dev *vc4 = to_vc4_dev(dev);
194 int ret;
195
196 sema_init(&vc4->async_modeset, 1);
197
198 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
199 if (ret < 0) {
200 dev_err(dev->dev, "failed to initialize vblank\n");
201 return ret;
202 }
203
204 dev->mode_config.max_width = 2048;
205 dev->mode_config.max_height = 2048;
206 dev->mode_config.funcs = &vc4_mode_funcs;
207 dev->mode_config.preferred_depth = 24;
208 dev->mode_config.async_page_flip = true;
209
210 dev->vblank_disable_allowed = true;
211
212 drm_mode_config_reset(dev);
213
214 vc4->fbdev = drm_fbdev_cma_init(dev, 32,
215 dev->mode_config.num_crtc,
216 dev->mode_config.num_connector);
217 if (IS_ERR(vc4->fbdev))
218 vc4->fbdev = NULL;
219
220 drm_kms_helper_poll_init(dev);
221
222 return 0;
223}
1/*
2 * Copyright (C) 2015 Broadcom
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 version 2 as
6 * published by the Free Software Foundation.
7 */
8
9/**
10 * DOC: VC4 KMS
11 *
12 * This is the general code for implementing KMS mode setting that
13 * doesn't clearly associate with any of the other objects (plane,
14 * crtc, HDMI encoder).
15 */
16
17#include "drm_crtc.h"
18#include "drm_atomic.h"
19#include "drm_atomic_helper.h"
20#include "drm_crtc_helper.h"
21#include "drm_plane_helper.h"
22#include "drm_fb_cma_helper.h"
23#include "vc4_drv.h"
24
25static void vc4_output_poll_changed(struct drm_device *dev)
26{
27 struct vc4_dev *vc4 = to_vc4_dev(dev);
28
29 drm_fbdev_cma_hotplug_event(vc4->fbdev);
30}
31
32struct vc4_commit {
33 struct drm_device *dev;
34 struct drm_atomic_state *state;
35 struct vc4_seqno_cb cb;
36};
37
38static void
39vc4_atomic_complete_commit(struct vc4_commit *c)
40{
41 struct drm_atomic_state *state = c->state;
42 struct drm_device *dev = state->dev;
43 struct vc4_dev *vc4 = to_vc4_dev(dev);
44
45 drm_atomic_helper_commit_modeset_disables(dev, state);
46
47 drm_atomic_helper_commit_planes(dev, state, 0);
48
49 drm_atomic_helper_commit_modeset_enables(dev, state);
50
51 /* Make sure that drm_atomic_helper_wait_for_vblanks()
52 * actually waits for vblank. If we're doing a full atomic
53 * modeset (as opposed to a vc4_update_plane() short circuit),
54 * then we need to wait for scanout to be done with our
55 * display lists before we free it and potentially reallocate
56 * and overwrite the dlist memory with a new modeset.
57 */
58 state->legacy_cursor_update = false;
59
60 drm_atomic_helper_wait_for_vblanks(dev, state);
61
62 drm_atomic_helper_cleanup_planes(dev, state);
63
64 drm_atomic_state_put(state);
65
66 up(&vc4->async_modeset);
67
68 kfree(c);
69}
70
71static void
72vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb)
73{
74 struct vc4_commit *c = container_of(cb, struct vc4_commit, cb);
75
76 vc4_atomic_complete_commit(c);
77}
78
79static struct vc4_commit *commit_init(struct drm_atomic_state *state)
80{
81 struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL);
82
83 if (!c)
84 return NULL;
85 c->dev = state->dev;
86 c->state = state;
87
88 return c;
89}
90
91/**
92 * vc4_atomic_commit - commit validated state object
93 * @dev: DRM device
94 * @state: the driver state object
95 * @nonblock: nonblocking commit
96 *
97 * This function commits a with drm_atomic_helper_check() pre-validated state
98 * object. This can still fail when e.g. the framebuffer reservation fails. For
99 * now this doesn't implement asynchronous commits.
100 *
101 * RETURNS
102 * Zero for success or -errno.
103 */
104static int vc4_atomic_commit(struct drm_device *dev,
105 struct drm_atomic_state *state,
106 bool nonblock)
107{
108 struct vc4_dev *vc4 = to_vc4_dev(dev);
109 int ret;
110 int i;
111 uint64_t wait_seqno = 0;
112 struct vc4_commit *c;
113 struct drm_plane *plane;
114 struct drm_plane_state *new_state;
115
116 c = commit_init(state);
117 if (!c)
118 return -ENOMEM;
119
120 /* Make sure that any outstanding modesets have finished. */
121 if (nonblock) {
122 struct drm_crtc *crtc;
123 struct drm_crtc_state *crtc_state;
124 unsigned long flags;
125 bool busy = false;
126
127 /*
128 * If there's an undispatched event to send then we're
129 * obviously still busy. If there isn't, then we can
130 * unconditionally wait for the semaphore because it
131 * shouldn't be contended (for long).
132 *
133 * This is to prevent a race where queuing a new flip
134 * from userspace immediately on receipt of an event
135 * beats our clean-up and returns EBUSY.
136 */
137 spin_lock_irqsave(&dev->event_lock, flags);
138 for_each_crtc_in_state(state, crtc, crtc_state, i)
139 busy |= vc4_event_pending(crtc);
140 spin_unlock_irqrestore(&dev->event_lock, flags);
141 if (busy) {
142 kfree(c);
143 return -EBUSY;
144 }
145 }
146 ret = down_interruptible(&vc4->async_modeset);
147 if (ret) {
148 kfree(c);
149 return ret;
150 }
151
152 ret = drm_atomic_helper_prepare_planes(dev, state);
153 if (ret) {
154 kfree(c);
155 up(&vc4->async_modeset);
156 return ret;
157 }
158
159 for_each_plane_in_state(state, plane, new_state, i) {
160 if ((plane->state->fb != new_state->fb) && new_state->fb) {
161 struct drm_gem_cma_object *cma_bo =
162 drm_fb_cma_get_gem_obj(new_state->fb, 0);
163 struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
164
165 wait_seqno = max(bo->seqno, wait_seqno);
166 }
167 }
168
169 /*
170 * This is the point of no return - everything below never fails except
171 * when the hw goes bonghits. Which means we can commit the new state on
172 * the software side now.
173 */
174
175 drm_atomic_helper_swap_state(state, true);
176
177 /*
178 * Everything below can be run asynchronously without the need to grab
179 * any modeset locks at all under one condition: It must be guaranteed
180 * that the asynchronous work has either been cancelled (if the driver
181 * supports it, which at least requires that the framebuffers get
182 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
183 * before the new state gets committed on the software side with
184 * drm_atomic_helper_swap_state().
185 *
186 * This scheme allows new atomic state updates to be prepared and
187 * checked in parallel to the asynchronous completion of the previous
188 * update. Which is important since compositors need to figure out the
189 * composition of the next frame right after having submitted the
190 * current layout.
191 */
192
193 drm_atomic_state_get(state);
194 if (nonblock) {
195 vc4_queue_seqno_cb(dev, &c->cb, wait_seqno,
196 vc4_atomic_complete_commit_seqno_cb);
197 } else {
198 vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false);
199 vc4_atomic_complete_commit(c);
200 }
201
202 return 0;
203}
204
205static const struct drm_mode_config_funcs vc4_mode_funcs = {
206 .output_poll_changed = vc4_output_poll_changed,
207 .atomic_check = drm_atomic_helper_check,
208 .atomic_commit = vc4_atomic_commit,
209 .fb_create = drm_fb_cma_create,
210};
211
212int vc4_kms_load(struct drm_device *dev)
213{
214 struct vc4_dev *vc4 = to_vc4_dev(dev);
215 int ret;
216
217 sema_init(&vc4->async_modeset, 1);
218
219 ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
220 if (ret < 0) {
221 dev_err(dev->dev, "failed to initialize vblank\n");
222 return ret;
223 }
224
225 dev->mode_config.max_width = 2048;
226 dev->mode_config.max_height = 2048;
227 dev->mode_config.funcs = &vc4_mode_funcs;
228 dev->mode_config.preferred_depth = 24;
229 dev->mode_config.async_page_flip = true;
230
231 drm_mode_config_reset(dev);
232
233 vc4->fbdev = drm_fbdev_cma_init(dev, 32,
234 dev->mode_config.num_crtc,
235 dev->mode_config.num_connector);
236 if (IS_ERR(vc4->fbdev))
237 vc4->fbdev = NULL;
238
239 drm_kms_helper_poll_init(dev);
240
241 return 0;
242}