[PATCH 1/2] drm/atomic: Add helpers for state-subclassing drivers

[Eric Anholt]

Thierry Reding <thierry.reding at gmail.com> writes:

> From: Thierry Reding <treding at nvidia.com>
>
> Drivers that subclass CRTC, plane or connector state need to carefully
> duplicate the code that the atomic helpers have. This is bound to cause
> breakage eventually because it requires auditing all drivers and update
> them when code is added to the helpers.
>
> In order to avoid that, implement new helpers that perform the required
> steps when copying and destroying state. These new helpers are exported
> so that state-subclassing drivers can use them. The default helpers are
> implemented using them as well, providing a single location that needs
> to be changed when adding to base atomic states.

I was looking for these helpers when writing VC4 KMS.  Thanks!

Reviewed-by: Eric Anholt <eric at anholt.net>
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