drivers/gpu/drm/msm/msm_atomic.c

   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 }