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
msm_atomic_async_commit(struct msm_kms * kms,int crtc_idx)30 static 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
66 out:
67 trace_msm_atomic_async_commit_finish(crtc_mask);
68 }
69
msm_atomic_pending_timer(struct hrtimer * t)70 static 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
msm_atomic_pending_work(struct work_struct * work)81 static 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
msm_atomic_init_pending_timer(struct msm_pending_timer * timer,struct msm_kms * kms,int crtc_idx)89 void 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
can_do_async(struct drm_atomic_state * state,struct drm_crtc ** async_crtc)99 static 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 */
get_crtc_mask(struct drm_atomic_state * state)130 static 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
msm_atomic_commit_tail(struct drm_atomic_state * state)142 void 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 }
248
