On 06/21/2017 06:19 PM, Eric Anholt wrote:
Mario Kleiner <mario.kleiner.de@xxxxxxxxx> 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.
Signed-off-by: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Cc: Eric Anholt <eric@xxxxxxxxxx>
If you can spin this against drm-misc-next instead of the downstream
tree, I can get it applied.
Done, thanks!
-mario
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