drm/sun4i: Implement some semblance of vblank event handling

atomic_flush seems to be the right place, right after we commit the
plane updates. Again use the fullproof version, since the pipe might
be off.

Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465388359-8070-6-git-send-email-daniel.vetter@ffwll.ch

diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 4182a21..f628b6d 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -51,10 +51,22 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
 {
        struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
        struct sun4i_drv *drv = scrtc->drv;
+       struct drm_pending_vblank_event *event = crtc->state->event;
 
        DRM_DEBUG_DRIVER("Committing plane changes\n");
 
        sun4i_backend_commit(drv->backend);
+
+       if (event) {
+               crtc->state->event = NULL;
+
+               spin_lock_irq(&crtc->dev->event_lock);
+               if (drm_crtc_vblank_get(crtc) == 0)
+                       drm_crtc_arm_vblank_event(crtc, event);
+               else
+                       drm_crtc_send_vblank_event(crtc, event);
+               spin_unlock_irq(&crtc->dev->event_lock);
+       }
 }
 
 static void sun4i_crtc_disable(struct drm_crtc *crtc)