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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <drm/drm_atomic_uapi.h>
8#include <drm/drm_vblank.h>
9
10#include "msm_atomic_trace.h"
11#include "msm_drv.h"
12#include "msm_gem.h"
13#include "msm_kms.h"
14
15/*
16 * Helpers to control vblanks while we flush.. basically just to ensure
17 * that vblank accounting is switched on, so we get valid seqn/timestamp
18 * on pageflip events (if requested)
19 */
20
21static void vblank_get(struct msm_kms *kms, unsigned crtc_mask)
22{
23 struct drm_crtc *crtc;
24
25 for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
26 if (!crtc->state->active)
27 continue;
28 drm_crtc_vblank_get(crtc);
29 }
30}
31
32static void vblank_put(struct msm_kms *kms, unsigned crtc_mask)
33{
34 struct drm_crtc *crtc;
35
36 for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
37 if (!crtc->state->active)
38 continue;
39 drm_crtc_vblank_put(crtc);
40 }
41}
42
43static void lock_crtcs(struct msm_kms *kms, unsigned int crtc_mask)
44{
45 int crtc_index;
46 struct drm_crtc *crtc;
47
48 for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
49 crtc_index = drm_crtc_index(crtc);
50 mutex_lock_nested(&kms->commit_lock[crtc_index], crtc_index);
51 }
52}
53
54static void unlock_crtcs(struct msm_kms *kms, unsigned int crtc_mask)
55{
56 struct drm_crtc *crtc;
57
58 for_each_crtc_mask_reverse(kms->dev, crtc, crtc_mask)
59 mutex_unlock(&kms->commit_lock[drm_crtc_index(crtc)]);
60}
61
62static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
63{
64 unsigned crtc_mask = BIT(crtc_idx);
65
66 trace_msm_atomic_async_commit_start(crtc_mask);
67
68 lock_crtcs(kms, crtc_mask);
69
70 if (!(kms->pending_crtc_mask & crtc_mask)) {
71 unlock_crtcs(kms, crtc_mask);
72 goto out;
73 }
74
75 kms->pending_crtc_mask &= ~crtc_mask;
76
77 kms->funcs->enable_commit(kms);
78
79 vblank_get(kms, crtc_mask);
80
81 /*
82 * Flush hardware updates:
83 */
84 trace_msm_atomic_flush_commit(crtc_mask);
85 kms->funcs->flush_commit(kms, crtc_mask);
86
87 /*
88 * Wait for flush to complete:
89 */
90 trace_msm_atomic_wait_flush_start(crtc_mask);
91 kms->funcs->wait_flush(kms, crtc_mask);
92 trace_msm_atomic_wait_flush_finish(crtc_mask);
93
94 vblank_put(kms, crtc_mask);
95
96 kms->funcs->complete_commit(kms, crtc_mask);
97 unlock_crtcs(kms, crtc_mask);
98 kms->funcs->disable_commit(kms);
99
100out:
101 trace_msm_atomic_async_commit_finish(crtc_mask);
102}
103
104static void msm_atomic_pending_work(struct kthread_work *work)
105{
106 struct msm_pending_timer *timer = container_of(work,
107 struct msm_pending_timer, work.work);
108
109 msm_atomic_async_commit(timer->kms, timer->crtc_idx);
110}
111
112int msm_atomic_init_pending_timer(struct msm_pending_timer *timer,
113 struct msm_kms *kms, int crtc_idx)
114{
115 timer->kms = kms;
116 timer->crtc_idx = crtc_idx;
117
118 timer->worker = kthread_create_worker(0, "atomic-worker-%d", crtc_idx);
119 if (IS_ERR(timer->worker)) {
120 int ret = PTR_ERR(timer->worker);
121 timer->worker = NULL;
122 return ret;
123 }
124 sched_set_fifo(timer->worker->task);
125
126 msm_hrtimer_work_init(&timer->work, timer->worker,
127 msm_atomic_pending_work,
128 CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
129
130 return 0;
131}
132
133void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer)
134{
135 if (timer->worker)
136 kthread_destroy_worker(timer->worker);
137}
138
139static bool can_do_async(struct drm_atomic_state *state,
140 struct drm_crtc **async_crtc)
141{
142 struct drm_connector_state *connector_state;
143 struct drm_connector *connector;
144 struct drm_crtc_state *crtc_state;
145 struct drm_crtc *crtc;
146 int i, num_crtcs = 0;
147
148 if (!(state->legacy_cursor_update || state->async_update))
149 return false;
150
151 /* any connector change, means slow path: */
152 for_each_new_connector_in_state(state, connector, connector_state, i)
153 return false;
154
155 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
156 if (drm_atomic_crtc_needs_modeset(crtc_state))
157 return false;
158 if (!crtc_state->active)
159 return false;
160 if (++num_crtcs > 1)
161 return false;
162 *async_crtc = crtc;
163 }
164
165 return true;
166}
167
168/* Get bitmask of crtcs that will need to be flushed. The bitmask
169 * can be used with for_each_crtc_mask() iterator, to iterate
170 * effected crtcs without needing to preserve the atomic state.
171 */
172static unsigned get_crtc_mask(struct drm_atomic_state *state)
173{
174 struct drm_crtc_state *crtc_state;
175 struct drm_crtc *crtc;
176 unsigned i, mask = 0;
177
178 for_each_new_crtc_in_state(state, crtc, crtc_state, i)
179 mask |= drm_crtc_mask(crtc);
180
181 return mask;
182}
183
184int msm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
185{
186 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
187 struct drm_crtc *crtc;
188 int i;
189
190 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
191 new_crtc_state, i) {
192 if ((old_crtc_state->ctm && !new_crtc_state->ctm) ||
193 (!old_crtc_state->ctm && new_crtc_state->ctm)) {
194 new_crtc_state->mode_changed = true;
195 state->allow_modeset = true;
196 }
197 }
198
199 return drm_atomic_helper_check(dev, state);
200}
201
202void msm_atomic_commit_tail(struct drm_atomic_state *state)
203{
204 struct drm_device *dev = state->dev;
205 struct msm_drm_private *priv = dev->dev_private;
206 struct msm_kms *kms = priv->kms;
207 struct drm_crtc *async_crtc = NULL;
208 unsigned crtc_mask = get_crtc_mask(state);
209 bool async = can_do_async(state, &async_crtc);
210
211 trace_msm_atomic_commit_tail_start(async, crtc_mask);
212
213 kms->funcs->enable_commit(kms);
214
215 /*
216 * Ensure any previous (potentially async) commit has
217 * completed:
218 */
219 lock_crtcs(kms, crtc_mask);
220 trace_msm_atomic_wait_flush_start(crtc_mask);
221 kms->funcs->wait_flush(kms, crtc_mask);
222 trace_msm_atomic_wait_flush_finish(crtc_mask);
223
224 /*
225 * Now that there is no in-progress flush, prepare the
226 * current update:
227 */
228 if (kms->funcs->prepare_commit)
229 kms->funcs->prepare_commit(kms, state);
230
231 /*
232 * Push atomic updates down to hardware:
233 */
234 drm_atomic_helper_commit_modeset_disables(dev, state);
235 drm_atomic_helper_commit_planes(dev, state, 0);
236 drm_atomic_helper_commit_modeset_enables(dev, state);
237
238 if (async) {
239 struct msm_pending_timer *timer =
240 &kms->pending_timers[drm_crtc_index(async_crtc)];
241
242 /* async updates are limited to single-crtc updates: */
243 WARN_ON(crtc_mask != drm_crtc_mask(async_crtc));
244
245 /*
246 * Start timer if we don't already have an update pending
247 * on this crtc:
248 */
249 if (!(kms->pending_crtc_mask & crtc_mask)) {
250 ktime_t vsync_time, wakeup_time;
251
252 kms->pending_crtc_mask |= crtc_mask;
253
254 if (drm_crtc_next_vblank_start(async_crtc, &vsync_time))
255 goto fallback;
256
257 wakeup_time = ktime_sub(vsync_time, ms_to_ktime(1));
258
259 msm_hrtimer_queue_work(&timer->work, wakeup_time,
260 HRTIMER_MODE_ABS);
261 }
262
263 kms->funcs->disable_commit(kms);
264 unlock_crtcs(kms, crtc_mask);
265 /*
266 * At this point, from drm core's perspective, we
267 * are done with the atomic update, so we can just
268 * go ahead and signal that it is done:
269 */
270 drm_atomic_helper_commit_hw_done(state);
271 drm_atomic_helper_cleanup_planes(dev, state);
272
273 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
274
275 return;
276 }
277
278fallback:
279 /*
280 * If there is any async flush pending on updated crtcs, fold
281 * them into the current flush.
282 */
283 kms->pending_crtc_mask &= ~crtc_mask;
284
285 vblank_get(kms, crtc_mask);
286
287 /*
288 * Flush hardware updates:
289 */
290 trace_msm_atomic_flush_commit(crtc_mask);
291 kms->funcs->flush_commit(kms, crtc_mask);
292 unlock_crtcs(kms, crtc_mask);
293 /*
294 * Wait for flush to complete:
295 */
296 trace_msm_atomic_wait_flush_start(crtc_mask);
297 kms->funcs->wait_flush(kms, crtc_mask);
298 trace_msm_atomic_wait_flush_finish(crtc_mask);
299
300 vblank_put(kms, crtc_mask);
301
302 lock_crtcs(kms, crtc_mask);
303 kms->funcs->complete_commit(kms, crtc_mask);
304 unlock_crtcs(kms, crtc_mask);
305 kms->funcs->disable_commit(kms);
306
307 drm_atomic_helper_commit_hw_done(state);
308 drm_atomic_helper_cleanup_planes(dev, state);
309
310 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
311}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <drm/drm_atomic_uapi.h>
8#include <drm/drm_gem_framebuffer_helper.h>
9#include <drm/drm_vblank.h>
10
11#include "msm_atomic_trace.h"
12#include "msm_drv.h"
13#include "msm_gem.h"
14#include "msm_kms.h"
15
16int msm_atomic_prepare_fb(struct drm_plane *plane,
17 struct drm_plane_state *new_state)
18{
19 struct msm_drm_private *priv = plane->dev->dev_private;
20 struct msm_kms *kms = priv->kms;
21
22 if (!new_state->fb)
23 return 0;
24
25 drm_gem_fb_prepare_fb(plane, new_state);
26
27 return msm_framebuffer_prepare(new_state->fb, kms->aspace);
28}
29
30static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
31{
32 unsigned crtc_mask = BIT(crtc_idx);
33
34 trace_msm_atomic_async_commit_start(crtc_mask);
35
36 mutex_lock(&kms->commit_lock);
37
38 if (!(kms->pending_crtc_mask & crtc_mask)) {
39 mutex_unlock(&kms->commit_lock);
40 goto out;
41 }
42
43 kms->pending_crtc_mask &= ~crtc_mask;
44
45 kms->funcs->enable_commit(kms);
46
47 /*
48 * Flush hardware updates:
49 */
50 trace_msm_atomic_flush_commit(crtc_mask);
51 kms->funcs->flush_commit(kms, crtc_mask);
52 mutex_unlock(&kms->commit_lock);
53
54 /*
55 * Wait for flush to complete:
56 */
57 trace_msm_atomic_wait_flush_start(crtc_mask);
58 kms->funcs->wait_flush(kms, crtc_mask);
59 trace_msm_atomic_wait_flush_finish(crtc_mask);
60
61 mutex_lock(&kms->commit_lock);
62 kms->funcs->complete_commit(kms, crtc_mask);
63 mutex_unlock(&kms->commit_lock);
64 kms->funcs->disable_commit(kms);
65
66out:
67 trace_msm_atomic_async_commit_finish(crtc_mask);
68}
69
70static enum hrtimer_restart msm_atomic_pending_timer(struct hrtimer *t)
71{
72 struct msm_pending_timer *timer = container_of(t,
73 struct msm_pending_timer, timer);
74 struct msm_drm_private *priv = timer->kms->dev->dev_private;
75
76 queue_work(priv->wq, &timer->work);
77
78 return HRTIMER_NORESTART;
79}
80
81static void msm_atomic_pending_work(struct work_struct *work)
82{
83 struct msm_pending_timer *timer = container_of(work,
84 struct msm_pending_timer, work);
85
86 msm_atomic_async_commit(timer->kms, timer->crtc_idx);
87}
88
89void msm_atomic_init_pending_timer(struct msm_pending_timer *timer,
90 struct msm_kms *kms, int crtc_idx)
91{
92 timer->kms = kms;
93 timer->crtc_idx = crtc_idx;
94 hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
95 timer->timer.function = msm_atomic_pending_timer;
96 INIT_WORK(&timer->work, msm_atomic_pending_work);
97}
98
99static bool can_do_async(struct drm_atomic_state *state,
100 struct drm_crtc **async_crtc)
101{
102 struct drm_connector_state *connector_state;
103 struct drm_connector *connector;
104 struct drm_crtc_state *crtc_state;
105 struct drm_crtc *crtc;
106 int i, num_crtcs = 0;
107
108 if (!(state->legacy_cursor_update || state->async_update))
109 return false;
110
111 /* any connector change, means slow path: */
112 for_each_new_connector_in_state(state, connector, connector_state, i)
113 return false;
114
115 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
116 if (drm_atomic_crtc_needs_modeset(crtc_state))
117 return false;
118 if (++num_crtcs > 1)
119 return false;
120 *async_crtc = crtc;
121 }
122
123 return true;
124}
125
126/* Get bitmask of crtcs that will need to be flushed. The bitmask
127 * can be used with for_each_crtc_mask() iterator, to iterate
128 * effected crtcs without needing to preserve the atomic state.
129 */
130static unsigned get_crtc_mask(struct drm_atomic_state *state)
131{
132 struct drm_crtc_state *crtc_state;
133 struct drm_crtc *crtc;
134 unsigned i, mask = 0;
135
136 for_each_new_crtc_in_state(state, crtc, crtc_state, i)
137 mask |= drm_crtc_mask(crtc);
138
139 return mask;
140}
141
142void msm_atomic_commit_tail(struct drm_atomic_state *state)
143{
144 struct drm_device *dev = state->dev;
145 struct msm_drm_private *priv = dev->dev_private;
146 struct msm_kms *kms = priv->kms;
147 struct drm_crtc *async_crtc = NULL;
148 unsigned crtc_mask = get_crtc_mask(state);
149 bool async = kms->funcs->vsync_time &&
150 can_do_async(state, &async_crtc);
151
152 trace_msm_atomic_commit_tail_start(async, crtc_mask);
153
154 kms->funcs->enable_commit(kms);
155
156 /*
157 * Ensure any previous (potentially async) commit has
158 * completed:
159 */
160 trace_msm_atomic_wait_flush_start(crtc_mask);
161 kms->funcs->wait_flush(kms, crtc_mask);
162 trace_msm_atomic_wait_flush_finish(crtc_mask);
163
164 mutex_lock(&kms->commit_lock);
165
166 /*
167 * Now that there is no in-progress flush, prepare the
168 * current update:
169 */
170 kms->funcs->prepare_commit(kms, state);
171
172 /*
173 * Push atomic updates down to hardware:
174 */
175 drm_atomic_helper_commit_modeset_disables(dev, state);
176 drm_atomic_helper_commit_planes(dev, state, 0);
177 drm_atomic_helper_commit_modeset_enables(dev, state);
178
179 if (async) {
180 struct msm_pending_timer *timer =
181 &kms->pending_timers[drm_crtc_index(async_crtc)];
182
183 /* async updates are limited to single-crtc updates: */
184 WARN_ON(crtc_mask != drm_crtc_mask(async_crtc));
185
186 /*
187 * Start timer if we don't already have an update pending
188 * on this crtc:
189 */
190 if (!(kms->pending_crtc_mask & crtc_mask)) {
191 ktime_t vsync_time, wakeup_time;
192
193 kms->pending_crtc_mask |= crtc_mask;
194
195 vsync_time = kms->funcs->vsync_time(kms, async_crtc);
196 wakeup_time = ktime_sub(vsync_time, ms_to_ktime(1));
197
198 hrtimer_start(&timer->timer, wakeup_time,
199 HRTIMER_MODE_ABS);
200 }
201
202 kms->funcs->disable_commit(kms);
203 mutex_unlock(&kms->commit_lock);
204
205 /*
206 * At this point, from drm core's perspective, we
207 * are done with the atomic update, so we can just
208 * go ahead and signal that it is done:
209 */
210 drm_atomic_helper_commit_hw_done(state);
211 drm_atomic_helper_cleanup_planes(dev, state);
212
213 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
214
215 return;
216 }
217
218 /*
219 * If there is any async flush pending on updated crtcs, fold
220 * them into the current flush.
221 */
222 kms->pending_crtc_mask &= ~crtc_mask;
223
224 /*
225 * Flush hardware updates:
226 */
227 trace_msm_atomic_flush_commit(crtc_mask);
228 kms->funcs->flush_commit(kms, crtc_mask);
229 mutex_unlock(&kms->commit_lock);
230
231 /*
232 * Wait for flush to complete:
233 */
234 trace_msm_atomic_wait_flush_start(crtc_mask);
235 kms->funcs->wait_flush(kms, crtc_mask);
236 trace_msm_atomic_wait_flush_finish(crtc_mask);
237
238 mutex_lock(&kms->commit_lock);
239 kms->funcs->complete_commit(kms, crtc_mask);
240 mutex_unlock(&kms->commit_lock);
241 kms->funcs->disable_commit(kms);
242
243 drm_atomic_helper_commit_hw_done(state);
244 drm_atomic_helper_cleanup_planes(dev, state);
245
246 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
247}