On Wed, Aug 09, 2017 at 04:07:24PM -0700, Matthias Kaehlcke wrote:
> rockchip_drm_sys_suspend/resume() obains a struct drm_device pointer
> from drvdata, the pointer is then dereferenced to obtain private data.
> drvdata is set when a display is bound, on systems without a
> (successfully probed) display drvdata is NULL and the PM functions
> try to dereference a NULL pointer.
> The suspend/resume code relies on a valid drm_device object, skip it if
> the pointer is NULL.
> Signed-off-by: Matthias Kaehlcke <m...@chromium.org>

For the record (I believe you found this already), Jeffy sent the same
patch out (to the wrong mailing lists), but it got applied a bit ago:


commit 0fa375e6bc9023211eead30a6a79963c45a563da 
drm/rockchip: Fix suspend crash when drm is not bound

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