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