Retrieve cooked vblank counter value and the system timestamp corresponding to that vblank counter value.
u32 drm_vblank_count_and_time(struct drm_device * dev, int crtc, struct timeval * vblanktime);
dev
DRM device
crtc
which counter to retrieve
vblanktime
Pointer to struct timeval to receive the vblank timestamp.
Fetches the “cooked” vblank count value that represents the number of vblank events since the system was booted, including lost events due to modesetting activity. Returns corresponding system timestamp of the time of the vblank interval that corresponds to the current vblank counter value.
Jesse Barnes <[email protected]>
Intel Corporation,
Initial version
Laurent Pinchart <[email protected]>
Ideas on board SPRL,
Driver internals
Daniel Vetter <[email protected]>
Intel Corporation,
Contributions all over the place