[PATCH 12/15] drm: Add acquire ctx to ->gamma_set hook

[Eric Anholt]

Daniel Vetter <daniel.vetter at ffwll.ch> writes:

> Atomic helpers really want this instead of the hacked-up legacy
> backoff trick, which unfortunately prevents drivers from using their
> own private drm_modeset_locks.
>
> Aside: There's a few atomic drivers (nv50, vc4, soon vmwgfx) which
> don't yet use the new atomic color mgmt/gamma table stuff. Would be
> nice if they could switch over and just hook up
> drm_atomic_helper_legacy_gamma_set() instead.

For notes like this, it would be helpful to have a pointer to a driver
doing it cleanly the current way.
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