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DRM_VBLANK_COUNT_AND(9) DRM Core DRM_VBLANK_COUNT_AND(9)

NAME

drm_vblank_count_and_time - retrieve “cooked” vblank counter value and the system timestamp corresponding to that vblank counter value.

SYNOPSIS

u32 drm_vblank_count_and_time(struct drm_device * dev, int crtc, struct timeval * vblanktime);

ARGUMENTS

dev
DRM device
crtc
which counter to retrieve
vblanktime
Pointer to struct timeval to receive the vblank timestamp.

DESCRIPTION

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.

AUTHORS

Jesse Barnes <jesse.barnes@intel.com>
 
Intel Corporation,
Initial version
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 
Ideas on board SPRL,
Driver internals
Daniel Vetter <daniel.vetter@ffwll.ch>
 
Intel Corporation,
Contributions all over the place

COPYRIGHT

February 2017 Kernel Hackers Manual 3.16