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 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 } 101 102 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 } 112 113 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 } 120 121 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 } 130 131 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 */ 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 } 173 174 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