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 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 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 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 58 static void lock_crtcs(struct msm_kms *kms, unsigned int crtc_mask) 59 { 60 struct drm_crtc *crtc; 61 62 for_each_crtc_mask(kms->dev, crtc, crtc_mask) 63 mutex_lock(&kms->commit_lock[drm_crtc_index(crtc)]); 64 } 65 66 static void unlock_crtcs(struct msm_kms *kms, unsigned int crtc_mask) 67 { 68 struct drm_crtc *crtc; 69 70 for_each_crtc_mask_reverse(kms->dev, crtc, crtc_mask) 71 mutex_unlock(&kms->commit_lock[drm_crtc_index(crtc)]); 72 } 73 74 static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx) 75 { 76 unsigned crtc_mask = BIT(crtc_idx); 77 78 trace_msm_atomic_async_commit_start(crtc_mask); 79 80 lock_crtcs(kms, crtc_mask); 81 82 if (!(kms->pending_crtc_mask & crtc_mask)) { 83 unlock_crtcs(kms, crtc_mask); 84 goto out; 85 } 86 87 kms->pending_crtc_mask &= ~crtc_mask; 88 89 kms->funcs->enable_commit(kms); 90 91 vblank_get(kms, crtc_mask); 92 93 /* 94 * Flush hardware updates: 95 */ 96 trace_msm_atomic_flush_commit(crtc_mask); 97 kms->funcs->flush_commit(kms, crtc_mask); 98 99 /* 100 * Wait for flush to complete: 101 */ 102 trace_msm_atomic_wait_flush_start(crtc_mask); 103 kms->funcs->wait_flush(kms, crtc_mask); 104 trace_msm_atomic_wait_flush_finish(crtc_mask); 105 106 vblank_put(kms, crtc_mask); 107 108 kms->funcs->complete_commit(kms, crtc_mask); 109 unlock_crtcs(kms, crtc_mask); 110 kms->funcs->disable_commit(kms); 111 112 out: 113 trace_msm_atomic_async_commit_finish(crtc_mask); 114 } 115 116 static enum hrtimer_restart msm_atomic_pending_timer(struct hrtimer *t) 117 { 118 struct msm_pending_timer *timer = container_of(t, 119 struct msm_pending_timer, timer); 120 121 kthread_queue_work(timer->worker, &timer->work); 122 123 return HRTIMER_NORESTART; 124 } 125 126 static void msm_atomic_pending_work(struct kthread_work *work) 127 { 128 struct msm_pending_timer *timer = container_of(work, 129 struct msm_pending_timer, work); 130 131 msm_atomic_async_commit(timer->kms, timer->crtc_idx); 132 } 133 134 int msm_atomic_init_pending_timer(struct msm_pending_timer *timer, 135 struct msm_kms *kms, int crtc_idx) 136 { 137 timer->kms = kms; 138 timer->crtc_idx = crtc_idx; 139 hrtimer_init(&timer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 140 timer->timer.function = msm_atomic_pending_timer; 141 142 timer->worker = kthread_create_worker(0, "atomic-worker-%d", crtc_idx); 143 if (IS_ERR(timer->worker)) { 144 int ret = PTR_ERR(timer->worker); 145 timer->worker = NULL; 146 return ret; 147 } 148 sched_set_fifo(timer->worker->task); 149 kthread_init_work(&timer->work, msm_atomic_pending_work); 150 151 return 0; 152 } 153 154 void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer) 155 { 156 if (timer->worker) 157 kthread_destroy_worker(timer->worker); 158 } 159 160 static bool can_do_async(struct drm_atomic_state *state, 161 struct drm_crtc **async_crtc) 162 { 163 struct drm_connector_state *connector_state; 164 struct drm_connector *connector; 165 struct drm_crtc_state *crtc_state; 166 struct drm_crtc *crtc; 167 int i, num_crtcs = 0; 168 169 if (!(state->legacy_cursor_update || state->async_update)) 170 return false; 171 172 /* any connector change, means slow path: */ 173 for_each_new_connector_in_state(state, connector, connector_state, i) 174 return false; 175 176 for_each_new_crtc_in_state(state, crtc, crtc_state, i) { 177 if (drm_atomic_crtc_needs_modeset(crtc_state)) 178 return false; 179 if (++num_crtcs > 1) 180 return false; 181 *async_crtc = crtc; 182 } 183 184 return true; 185 } 186 187 /* Get bitmask of crtcs that will need to be flushed. The bitmask 188 * can be used with for_each_crtc_mask() iterator, to iterate 189 * effected crtcs without needing to preserve the atomic state. 190 */ 191 static unsigned get_crtc_mask(struct drm_atomic_state *state) 192 { 193 struct drm_crtc_state *crtc_state; 194 struct drm_crtc *crtc; 195 unsigned i, mask = 0; 196 197 for_each_new_crtc_in_state(state, crtc, crtc_state, i) 198 mask |= drm_crtc_mask(crtc); 199 200 return mask; 201 } 202 203 void msm_atomic_commit_tail(struct drm_atomic_state *state) 204 { 205 struct drm_device *dev = state->dev; 206 struct msm_drm_private *priv = dev->dev_private; 207 struct msm_kms *kms = priv->kms; 208 struct drm_crtc *async_crtc = NULL; 209 unsigned crtc_mask = get_crtc_mask(state); 210 bool async = kms->funcs->vsync_time && 211 can_do_async(state, &async_crtc); 212 213 trace_msm_atomic_commit_tail_start(async, crtc_mask); 214 215 kms->funcs->enable_commit(kms); 216 217 /* 218 * Ensure any previous (potentially async) commit has 219 * completed: 220 */ 221 lock_crtcs(kms, crtc_mask); 222 trace_msm_atomic_wait_flush_start(crtc_mask); 223 kms->funcs->wait_flush(kms, crtc_mask); 224 trace_msm_atomic_wait_flush_finish(crtc_mask); 225 226 /* 227 * Now that there is no in-progress flush, prepare the 228 * current update: 229 */ 230 kms->funcs->prepare_commit(kms, state); 231 232 /* 233 * Push atomic updates down to hardware: 234 */ 235 drm_atomic_helper_commit_modeset_disables(dev, state); 236 drm_atomic_helper_commit_planes(dev, state, 0); 237 drm_atomic_helper_commit_modeset_enables(dev, state); 238 239 if (async) { 240 struct msm_pending_timer *timer = 241 &kms->pending_timers[drm_crtc_index(async_crtc)]; 242 243 /* async updates are limited to single-crtc updates: */ 244 WARN_ON(crtc_mask != drm_crtc_mask(async_crtc)); 245 246 /* 247 * Start timer if we don't already have an update pending 248 * on this crtc: 249 */ 250 if (!(kms->pending_crtc_mask & crtc_mask)) { 251 ktime_t vsync_time, wakeup_time; 252 253 kms->pending_crtc_mask |= crtc_mask; 254 255 vsync_time = kms->funcs->vsync_time(kms, async_crtc); 256 wakeup_time = ktime_sub(vsync_time, ms_to_ktime(1)); 257 258 hrtimer_start(&timer->timer, wakeup_time, 259 HRTIMER_MODE_ABS); 260 } 261 262 kms->funcs->disable_commit(kms); 263 unlock_crtcs(kms, crtc_mask); 264 /* 265 * At this point, from drm core's perspective, we 266 * are done with the atomic update, so we can just 267 * go ahead and signal that it is done: 268 */ 269 drm_atomic_helper_commit_hw_done(state); 270 drm_atomic_helper_cleanup_planes(dev, state); 271 272 trace_msm_atomic_commit_tail_finish(async, crtc_mask); 273 274 return; 275 } 276 277 /* 278 * If there is any async flush pending on updated crtcs, fold 279 * them into the current flush. 280 */ 281 kms->pending_crtc_mask &= ~crtc_mask; 282 283 vblank_get(kms, crtc_mask); 284 285 /* 286 * Flush hardware updates: 287 */ 288 trace_msm_atomic_flush_commit(crtc_mask); 289 kms->funcs->flush_commit(kms, crtc_mask); 290 unlock_crtcs(kms, crtc_mask); 291 /* 292 * Wait for flush to complete: 293 */ 294 trace_msm_atomic_wait_flush_start(crtc_mask); 295 kms->funcs->wait_flush(kms, crtc_mask); 296 trace_msm_atomic_wait_flush_finish(crtc_mask); 297 298 vblank_put(kms, crtc_mask); 299 300 lock_crtcs(kms, crtc_mask); 301 kms->funcs->complete_commit(kms, crtc_mask); 302 unlock_crtcs(kms, crtc_mask); 303 kms->funcs->disable_commit(kms); 304 305 drm_atomic_helper_commit_hw_done(state); 306 drm_atomic_helper_cleanup_planes(dev, state); 307 308 trace_msm_atomic_commit_tail_finish(async, crtc_mask); 309 } 310