Rockchip just blew up here on testing, because I removed some "is this
crtc already disabled/enabled" state tracking from callbacks (not needed
with atomic). Turns out that was needed to work around rockchip still
calling legacy helper code.

Since me explaining on irc/mailing-list plus kerneldoc isn't enough,
be more verbose and add dmesg output. Not that anyone actually reads that,
either.

Cc: Tomeu Vizoso <tomeu.viz...@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
---
 drivers/gpu/drm/drm_crtc_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc_helper.c 
b/drivers/gpu/drm/drm_crtc_helper.c
index a6e42433ef0e..b47ec24939a0 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -232,6 +232,9 @@ static void __drm_helper_disable_unused_functions(struct 
drm_device *dev)
  */
 void drm_helper_disable_unused_functions(struct drm_device *dev)
 {
+       if (drm_core_check_feature(dev, DRIVER_ATOMIC))
+               DRM_ERROR("Called for atomic driver, this is not what you 
want.\n");
+
        drm_modeset_lock_all(dev);
        __drm_helper_disable_unused_functions(dev);
        drm_modeset_unlock_all(dev);
-- 
2.8.1

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