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 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
  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
  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
  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
  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  */
 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
 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 }