drm_get_last_vbltimestamp
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Name

drm_get_last_vbltimestamp — retrieve raw timestamp for the most recent vblank interval

Synopsis

u32 drm_get_last_vbltimestamp (struct drm_device * dev,
 int crtc,
 struct timeval * tvblank,
 unsigned flags);
 

Arguments

dev

DRM device

crtc

which CRTC's vblank timestamp to retrieve

tvblank

Pointer to target struct timeval which should receive the timestamp

flags

Flags to pass to driver: 0 = Default, DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler

Description

Fetches the system timestamp corresponding to the time of the most recent vblank interval on specified CRTC. May call into kms-driver to compute the timestamp with a high-precision GPU specific method.

Returns zero if timestamp originates from uncorrected do_gettimeofday call, i.e., it isn't very precisely locked to the true vblank.

Returns

Non-zero if timestamp is considered to be very precise, zero otherwise.

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