[PATCH] drm/vc4: Allow vblank_disable_immediate on non-fw-kms. (v2)

[Eric Anholt]

Mario Kleiner <mario.kleiner.de at gmail.com> writes:

> With instantaneous high precision vblank timestamping
> that updates at leading edge of vblank, the emulated
> "hw vblank counter" from vblank timestamping which
> increments at leading edge of vblank, and reliable
> page flip execution and completion at leading edge
> of vblank, we should meet the requirements for fast
> vblank irq disable/enable.
>
> Testing against rpi-4.12-rc5 Linux kernel with timing
> measurement equipment indicates this works fine,
> so allow immediate vblank disable for power saving.
>
> For debugging in case of unexpected trouble, booting
> with kernel cmdline option drm.vblankoffdelay=0
> would keep vblank irqs on to approximate old behavior.

Reviewed and applied.  Thanks!
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