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(lock: &kms->commit_lock[crtc_index], subclass: 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(lock: &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(kms: timer->kms, crtc_idx: 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_run_worker(0, "atomic-worker-%d", crtc_idx);
119 if (IS_ERR(ptr: timer->worker)) {
120 int ret = PTR_ERR(ptr: timer->worker);
121 timer->worker = NULL;
122 return ret;
123 }
124 sched_set_fifo(p: timer->worker->task);
125
126 msm_hrtimer_work_init(work: &timer->work, worker: timer->worker,
127 fn: msm_atomic_pending_work,
128 CLOCK_MONOTONIC, mode: 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(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(state: 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 msm_drm_private *priv = dev->dev_private;
187 struct msm_kms *kms = priv->kms;
188 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
189 struct drm_crtc *crtc;
190 int i, ret = 0;
191
192 /*
193 * FIXME: stop setting allow_modeset and move this check to the DPU
194 * driver.
195 */
196 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
197 new_crtc_state, i) {
198 if ((old_crtc_state->ctm && !new_crtc_state->ctm) ||
199 (!old_crtc_state->ctm && new_crtc_state->ctm)) {
200 new_crtc_state->mode_changed = true;
201 state->allow_modeset = true;
202 }
203 }
204
205 if (kms && kms->funcs && kms->funcs->check_mode_changed)
206 ret = kms->funcs->check_mode_changed(kms, state);
207 if (ret)
208 return ret;
209
210 return drm_atomic_helper_check(dev, state);
211}
212
213void msm_atomic_commit_tail(struct drm_atomic_state *state)
214{
215 struct drm_device *dev = state->dev;
216 struct msm_drm_private *priv = dev->dev_private;
217 struct msm_kms *kms = priv->kms;
218 struct drm_crtc *async_crtc = NULL;
219 unsigned crtc_mask = get_crtc_mask(state);
220 bool async = can_do_async(state, async_crtc: &async_crtc);
221
222 trace_msm_atomic_commit_tail_start(async, crtc_mask);
223
224 kms->funcs->enable_commit(kms);
225
226 /*
227 * Ensure any previous (potentially async) commit has
228 * completed:
229 */
230 lock_crtcs(kms, crtc_mask);
231 trace_msm_atomic_wait_flush_start(crtc_mask);
232 kms->funcs->wait_flush(kms, crtc_mask);
233 trace_msm_atomic_wait_flush_finish(crtc_mask);
234
235 atomic_set(v: &kms->fault_snapshot_capture, i: 0);
236
237 /*
238 * Now that there is no in-progress flush, prepare the
239 * current update:
240 */
241 if (kms->funcs->prepare_commit)
242 kms->funcs->prepare_commit(kms, state);
243
244 /*
245 * Push atomic updates down to hardware:
246 */
247 drm_atomic_helper_commit_modeset_disables(dev, state);
248 drm_atomic_helper_commit_planes(dev, state, flags: 0);
249 drm_atomic_helper_commit_modeset_enables(dev, old_state: state);
250
251 if (async) {
252 struct msm_pending_timer *timer =
253 &kms->pending_timers[drm_crtc_index(crtc: async_crtc)];
254
255 /* async updates are limited to single-crtc updates: */
256 WARN_ON(crtc_mask != drm_crtc_mask(async_crtc));
257
258 /*
259 * Start timer if we don't already have an update pending
260 * on this crtc:
261 */
262 if (!(kms->pending_crtc_mask & crtc_mask)) {
263 ktime_t vsync_time, wakeup_time;
264
265 kms->pending_crtc_mask |= crtc_mask;
266
267 if (drm_crtc_next_vblank_start(crtc: async_crtc, vblanktime: &vsync_time))
268 goto fallback;
269
270 wakeup_time = ktime_sub(vsync_time, ms_to_ktime(1));
271
272 msm_hrtimer_queue_work(work: &timer->work, wakeup_time,
273 mode: HRTIMER_MODE_ABS);
274 }
275
276 kms->funcs->disable_commit(kms);
277 unlock_crtcs(kms, crtc_mask);
278 /*
279 * At this point, from drm core's perspective, we
280 * are done with the atomic update, so we can just
281 * go ahead and signal that it is done:
282 */
283 drm_atomic_helper_commit_hw_done(state);
284 drm_atomic_helper_cleanup_planes(dev, old_state: state);
285
286 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
287
288 return;
289 }
290
291fallback:
292 /*
293 * If there is any async flush pending on updated crtcs, fold
294 * them into the current flush.
295 */
296 kms->pending_crtc_mask &= ~crtc_mask;
297
298 vblank_get(kms, crtc_mask);
299
300 /*
301 * Flush hardware updates:
302 */
303 trace_msm_atomic_flush_commit(crtc_mask);
304 kms->funcs->flush_commit(kms, crtc_mask);
305 unlock_crtcs(kms, crtc_mask);
306 /*
307 * Wait for flush to complete:
308 */
309 trace_msm_atomic_wait_flush_start(crtc_mask);
310 kms->funcs->wait_flush(kms, crtc_mask);
311 trace_msm_atomic_wait_flush_finish(crtc_mask);
312
313 vblank_put(kms, crtc_mask);
314
315 lock_crtcs(kms, crtc_mask);
316 kms->funcs->complete_commit(kms, crtc_mask);
317 unlock_crtcs(kms, crtc_mask);
318 kms->funcs->disable_commit(kms);
319
320 drm_atomic_helper_commit_hw_done(state);
321 drm_atomic_helper_cleanup_planes(dev, old_state: state);
322
323 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
324}
325

source code of linux/drivers/gpu/drm/msm/msm_atomic.c