[PATCH] drm/vc4: Fix VBLANK handling in crtc->enable() path

[Eric Anholt]

Boris Brezillon <boris.brezillon at free-electrons.com> writes:

> When we are enabling a CRTC, drm_crtc_vblank_get() is called before
> drm_crtc_vblank_on(), which is not supposed to happen (hence the
> WARN_ON() in the code). To solve the problem, we delay the 'update
> display list' operation after the CRTC is actually enabled.

Reviewed and pushed to drm-misc-next-fixes (with a Fixes tag for the
refactor you did that made this a more prominent warning).  Sorry for
the delay!
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