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| author |   Mario Kleiner <mario.kleiner.de@gmail.com> | 2016-05-06 19:26:06 +0200 |
|---|---|---|
| committer |   Eric Anholt <eric@anholt.net> | 2016-05-31 15:15:35 -0700 |
| commit | ee7c10e10b632e2319ed1d2d49d63df51a611e62 (patch) | |
| tree | e141ffcf4cf4f59b4d48805569de4d7eea2427bf /drivers/gpu/drm/vc4 | |
| parent | drm/vc4: Fix get_vblank_counter with proper no-op for Linux 4.4+ (diff) | |
| download | linux-dev-ee7c10e10b632e2319ed1d2d49d63df51a611e62.tar.xz linux-dev-ee7c10e10b632e2319ed1d2d49d63df51a611e62.zip | |
drm/vc4: Fix drm_vblank_put/get imbalance in page flip path.
The async page flip path was missing drm_crtc_vblank_get/put
completely. The sync flip path was missing a vblank put, so async
flips only reported proper pageflip completion events by chance,
and vblank irq's never turned off after a first vsync'ed page flip
until system reboot.
Tested against Raspian kernel 4.4.8 tree on RPi 2B.
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Fixes: b501bacc6060 ("drm/vc4: Add support for async pageflips.")
Diffstat (limited to 'drivers/gpu/drm/vc4')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_crtc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 904d0754ad78..e9befb6d10fd 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -506,6 +506,7 @@ static void vc4_crtc_handle_page_flip(struct vc4_crtc *vc4_crtc) if (vc4_crtc->event) { drm_crtc_send_vblank_event(crtc, vc4_crtc->event); vc4_crtc->event = NULL; + drm_crtc_vblank_put(crtc); } spin_unlock_irqrestore(&dev->event_lock, flags); } @@ -556,6 +557,7 @@ vc4_async_page_flip_complete(struct vc4_seqno_cb *cb) spin_unlock_irqrestore(&dev->event_lock, flags); } + drm_crtc_vblank_put(crtc); drm_framebuffer_unreference(flip_state->fb); kfree(flip_state); @@ -598,6 +600,8 @@ static int vc4_async_page_flip(struct drm_crtc *crtc, return ret; } + WARN_ON(drm_crtc_vblank_get(crtc) != 0); + /* Immediately update the plane's legacy fb pointer, so that later * modeset prep sees the state that will be present when the semaphore * is released. |