[PATCH] drm/rockchip: Return -EBUSY if there's already a pending flip event

[Tomeu Vizoso]

As per the docs, atomic_commit should return -EBUSY "if an asycnhronous
updated is requested and there is an earlier updated pending".

Also wait for the pending event to complete when a sync update is
requested.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_drv.h |  1 +
 drivers/gpu/drm/rockchip/rockchip_drm_fb.c  | 14 +++++++++++++-
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c |  6 ++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h 
b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
index 3529f692edb8..37952eefd33d 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -69,6 +69,7 @@ int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc);
 int rockchip_drm_crtc_mode_config(struct drm_crtc *crtc, int connector_type,
                                  int out_mode);
+bool rockchip_drm_crtc_has_pending_event(struct drm_crtc *crtc);
 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
                                   struct device *dev);
 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c 
b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index 3b8f652698f8..028fd2f8f47b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -280,7 +280,19 @@ int rockchip_drm_atomic_commit(struct drm_device *dev,
 {
        struct rockchip_drm_private *private = dev->dev_private;
        struct rockchip_atomic_commit *commit = &private->commit;
-       int ret;
+       struct drm_crtc_state *crtc_state;
+       struct drm_crtc *crtc;
+       int i, ret;
+
+       for_each_crtc_in_state(state, crtc, crtc_state, i) {
+               if (crtc->state->event ||
+                   rockchip_drm_crtc_has_pending_event(crtc)) {
+                       if (async)
+                               return -EBUSY;
+                       else
+                               rockchip_crtc_wait_for_update(crtc);
+               }
+       }

        ret = drm_atomic_helper_prepare_planes(dev, state);
        if (ret)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c 
b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index e2118e62345b..5240bc8fe088 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -848,6 +848,12 @@ int rockchip_drm_crtc_mode_config(struct drm_crtc *crtc,
 }
 EXPORT_SYMBOL_GPL(rockchip_drm_crtc_mode_config);

+bool rockchip_drm_crtc_has_pending_event(struct drm_crtc *crtc)
+{
+       return to_vop(crtc)->event;
+}
+EXPORT_SYMBOL_GPL(rockchip_drm_crtc_has_pending_event);
+
 static int vop_crtc_enable_vblank(struct drm_crtc *crtc)
 {
        struct vop *vop = to_vop(crtc);
-- 
2.5.5