[PATCH 0/6] drm: Explicit target vblank seqno for page flips

[Alex Deucher]

On Wed, Aug 3, 2016 at 11:39 PM, Michel Dänzer <michel at daenzer.net> wrote:
> The purpose of this series is to allow drivers to avoid unnecessarily
> delaying page flips, by explicitly telling the driver which vblank seqno
> a flip is supposed to take effect in.
>
> Patch 1 sets the target to the vblank seqno after the current one when
> the DRM_IOCTL_MODE_PAGE_FLIP ioctl is called, preserving the ioctl
> contract with existing userspace.
>
> Patches 2-4 take advantage of this in the amdgpu and radeon drivers, by
> allowing a flip to be programmed and executed during the target vertical
> blank period (or a later one).
>
> Patch 6 extends the ioctl with new flags, which allow userspace to
> explicitly specify the target vblank seqno. This can also avoid delaying
> flips in some cases where we are already in the target vertical blank
> period when the ioctl is called.
>
> [PATCH 1/6] drm: Add page_flip_target CRTC hook
> [PATCH 2/6] drm/amdgpu: Provide page_flip_target hook
> [PATCH 3/6] drm/amdgpu: Set MASTER_UPDATE_MODE to 0 again
> [PATCH 4/6] drm/radeon: Provide page_flip_target hook
> [PATCH 5/6] drm/radeon: Set MASTER_UPDATE_MODE to 0 again
> [PATCH 6/6] drm: Add DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE

Small comment on patch 1.  The rest are:
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

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