target/linux/brcm2708/patches-4.9/950-0179-drm-vc4-Fix-sending-of-page-flip-completion-events-i.patch

   1 From bc93583742c7ba9c84462664d4c798ba43bef26f Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Thu, 2 Feb 2017 09:42:18 -0800
   4 Subject: [PATCH] drm/vc4: Fix sending of page flip completion events in FKMS
   5  mode.
   6
   7 In the rewrite of vc4_crtc.c for fkms, I dropped the part of the
   8 CRTC's atomic flush handler that moved the completion event from the
   9 proposed atomic state change to the CRTC's current state.  That meant
  10 that when full screen pageflipping happened (glxgears -fullscreen in
  11 X, compton, por weston), the app would end up blocked firever waiting
  12 to draw its next frame.
  13
  14 Signed-off-by: Eric Anholt <eric@anholt.net>
  15 ---
  16  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 15 +++++++++++++++
  17  1 file changed, 15 insertions(+)
  18
  19 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  20 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  21 @@ -338,6 +338,21 @@ static int vc4_crtc_atomic_check(struct
  22  static void vc4_crtc_atomic_flush(struct drm_crtc *crtc,
  23                                   struct drm_crtc_state *old_state)
  24  {
  25 +       struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
  26 +       struct drm_device *dev = crtc->dev;
  27 +
  28 +       if (crtc->state->event) {
  29 +               unsigned long flags;
  30 +
  31 +               crtc->state->event->pipe = drm_crtc_index(crtc);
  32 +
  33 +               WARN_ON(drm_crtc_vblank_get(crtc) != 0);
  34 +
  35 +               spin_lock_irqsave(&dev->event_lock, flags);
  36 +               vc4_crtc->event = crtc->state->event;
  37 +               crtc->state->event = NULL;
  38 +               spin_unlock_irqrestore(&dev->event_lock, flags);
  39 +       }
  40  }
  41
  42  static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc)