[PATCH] drm: simple_kms_helper: Handle the vblank events

[Marek Vasut]

Handle the vblank events in the simple_kms_helper driver, otherwise
the drm_atomic_helper flip_done event never happens.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Noralf Trønnes <noralf at tronnes.org>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: David Airlie <airlied at linux.ie>
---
 drivers/gpu/drm/drm_simple_kms_helper.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index 7b6d26e..3345b40 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -34,6 +34,23 @@ static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
 	.destroy = drm_encoder_cleanup,
 };
 
+static void drm_simple_kms_crtc_begin(struct drm_crtc *crtc,
+				      struct drm_crtc_state *state)
+{
+	struct drm_pending_vblank_event *event = crtc->state->event;
+
+	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 int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
 				     struct drm_crtc_state *state)
 {
@@ -63,6 +80,7 @@ static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc)
 }
 
 static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
+	.atomic_begin = drm_simple_kms_crtc_begin,
 	.atomic_check = drm_simple_kms_crtc_check,
 	.disable = drm_simple_kms_crtc_disable,
 	.enable = drm_simple_kms_crtc_enable,
-- 
2.9.3