[RFC PATCH] drm/rockchip: update cursors asynchronously through atomic.

[Enric Balletbo i Serra]

Add support to async updates of cursors by using the new atomic
interface for that.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo at collabora.com>
---
I am sending this as RFC because I still don't have a deep knowledge of
the hw and I am not sure if the vop_plane_update function can be reused
in both cases, atomic_updates and atomic_async_updates. I think that
someone with more knowledge should take a look. The patch was tested on
a Samsung Chromebook Plus in two ways.

1. Running all igt kms_cursor_legacy and kms_atomic at plane_cursor_legacy
tests and see that there is no regression after the patch.

2. Running weston using the atomic API.

Best regards,
 Enric

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 79 ++++++++++++++++-----
 1 file changed, 63 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 53d4afe15278..a89214541439 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -688,8 +688,7 @@ static void vop_plane_atomic_disable(struct drm_plane *plane,
 	spin_unlock(&vop->reg_lock);
 }
 
-static void vop_plane_atomic_update(struct drm_plane *plane,
-		struct drm_plane_state *old_state)
+static void vop_plane_update(struct drm_plane *plane)
 {
 	struct drm_plane_state *state = plane->state;
 	struct drm_crtc *crtc = state->crtc;
@@ -710,20 +709,6 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
 	bool rb_swap;
 	int format;
 
-	/*
-	 * can't update plane when vop is disabled.
-	 */
-	if (WARN_ON(!crtc))
-		return;
-
-	if (WARN_ON(!vop->is_enabled))
-		return;
-
-	if (!state->visible) {
-		vop_plane_atomic_disable(plane, old_state);
-		return;
-	}
-
 	obj = rockchip_fb_get_gem_obj(fb, 0);
 	rk_obj = to_rockchip_obj(obj);
 
@@ -794,10 +779,72 @@ static void vop_plane_atomic_update(struct drm_plane *plane,
 	spin_unlock(&vop->reg_lock);
 }
 
+static void vop_plane_atomic_update(struct drm_plane *plane,
+				    struct drm_plane_state *old_state)
+{
+	struct drm_plane_state *state = plane->state;
+	struct vop *vop = to_vop(state->crtc);
+
+	/*
+	 * can't update plane when vop is disabled.
+	 */
+	if (WARN_ON(!state->crtc))
+		return;
+
+	if (WARN_ON(!vop->is_enabled))
+		return;
+
+	if (!state->visible) {
+		vop_plane_atomic_disable(plane, old_state);
+		return;
+	}
+
+	vop_plane_update(plane);
+}
+
+static int vop_plane_atomic_async_check(struct drm_plane *plane,
+					struct drm_plane_state *state)
+{
+	struct drm_crtc_state *crtc_state;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
+							state->crtc);
+	if (WARN_ON(!crtc_state))
+		return -EINVAL;
+
+	if (!crtc_state->active)
+		return -EINVAL;
+
+	if (plane->state->crtc != state->crtc ||
+	    plane->state->src_w != state->src_w ||
+	    plane->state->src_h != state->src_h ||
+	    plane->state->crtc_w != state->crtc_w ||
+	    plane->state->crtc_h != state->crtc_h ||
+	    !plane->state->fb ||
+	    plane->state->fb != state->fb)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void vop_plane_atomic_async_update(struct drm_plane *plane,
+					  struct drm_plane_state *new_state)
+{
+	plane->state->src_x = new_state->src_x;
+	plane->state->src_y = new_state->src_y;
+	plane->state->crtc_x = new_state->crtc_x;
+	plane->state->crtc_y = new_state->crtc_y;
+	plane->state->fb = new_state->fb;
+
+	vop_plane_update(plane);
+}
+
 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 	.atomic_check = vop_plane_atomic_check,
 	.atomic_update = vop_plane_atomic_update,
 	.atomic_disable = vop_plane_atomic_disable,
+	.atomic_async_check = vop_plane_atomic_async_check,
+	.atomic_async_update = vop_plane_atomic_async_update,
 };
 
 static const struct drm_plane_funcs vop_plane_funcs = {
-- 
2.17.0