drm/imx: move arming of the vblank event to atomic_flush

[ Upstream commit 6a055b92de15af987b4027826d43aa103c65a3c4 ]

Right now the vblank event completion is racing with the atomic update,
which is especially bad when the PRE is in use, as one of the hardware
issue workaround might extend the atomic commit for quite some time.

If the vblank IRQ happens to trigger during that time, we will prematurely
signal the atomic commit completion to userspace, which causes tearing
when userspace re-uses a framebuffer we haven't managed to flip away from
yet.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 6be515a9fb694b5fdac53d880430ba218b08e544..8dbba61a270827829d4fc92444d22a82462d9bb8 100644 (file)
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -189,7 +189,11 @@ static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
                                  struct drm_crtc_state *old_crtc_state)
 {
        drm_crtc_vblank_on(crtc);
+}
 
+static void ipu_crtc_atomic_flush(struct drm_crtc *crtc,
+                                 struct drm_crtc_state *old_crtc_state)
+{
        spin_lock_irq(&crtc->dev->event_lock);
        if (crtc->state->event) {
                WARN_ON(drm_crtc_vblank_get(crtc));
@@ -257,6 +261,7 @@ static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
        .mode_set_nofb = ipu_crtc_mode_set_nofb,
        .atomic_check = ipu_crtc_atomic_check,
        .atomic_begin = ipu_crtc_atomic_begin,
+       .atomic_flush = ipu_crtc_atomic_flush,
        .atomic_disable = ipu_crtc_atomic_disable,
        .enable = ipu_crtc_enable,
 };