[PATCH] drm: vc4: Don't wait for vblank when updating the cursor

[Eric Anholt]

Michael Zoran <mzoran at crowfest.net> writes:

> Commonly used desktop environments such as xfce4 and gnome
> on debian sid can flood the graphics drivers with cursor
> updates.  Because the current implementation is waiting
> for a vblank between cursor updates, this will cause the
> display to hang for a long time since a typical refresh
> rate is only 60Hz.
>
> This is unnecessary and unexpected by user mode software,
> so simply swap out the cursor frame buffer without waiting.
>
> Signed-off-by: Michael Zoran <mzoran at crowfest.net>

Reviewed and pushed to drm-misc-next.  Thanks!
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