[PATCHv2] drm/radeon: Move pageflip request from vblank IRQ to ioctl

[Paul Menzel]

Am Mittwoch, den 06.07.2011, 19:04 +0100 schrieb Simon Farnsworth:
> The radeon pageflip ioctl handler delayed submitting the pageflip to
> hardware until the vblank IRQ handler. On AMD Fusion (PALM GPU, G-T56N
> CPU), when using a reduced blanking CVT mode, a pageflip submitted to
> hardware in the IRQ handler failed to complete before the end of the
> vblank, resulting in a guaranteed halving of frame rate despite having
> plenty of spare CPU and GPU resource.
> 
> Fix this by moving the pageflip request to hardware into the pageflip
> ioctl, waiting until we are outside a vblank period so that pageflip
> timing is still accurate.
> 
> This doubles my frame rate in reduced blanking modes, and does not
> have an impact on CPU usage in normal blanking modes.
> 
> Signed-off-by: Simon Farnsworth <simon.farnsworth at onelan.co.uk>

Please mention the bug number the commit closes/addresses in the commit
message.

[…]


Thanks,

Paul
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