'\" t
.\"     Title: drm_get_last_vbltimestamp
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: DRM Core
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "DRM_GET_LAST_VBLTIME" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "DRM Core"
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.SH "NAME"
drm_get_last_vbltimestamp \- retrieve raw timestamp for the most recent vblank interval
.SH "SYNOPSIS"
.HP \w'u32\ drm_get_last_vbltimestamp('u
.BI "u32 drm_get_last_vbltimestamp(struct\ drm_device\ *\ " "dev" ", int\ " "crtc" ", struct\ timeval\ *\ " "tvblank" ", unsigned\ " "flags" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
DRM device
.RE
.PP
\fIcrtc\fR
.RS 4
which CRTC\*(Aqs vblank timestamp to retrieve
.RE
.PP
\fItvblank\fR
.RS 4
Pointer to target struct timeval which should receive the timestamp
.RE
.PP
\fIflags\fR
.RS 4
Flags to pass to driver: 0 = Default, DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
.RE
.SH "DESCRIPTION"
.PP
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\&.
.PP
Returns zero if timestamp originates from uncorrected
\fBdo_gettimeofday\fR
call, i\&.e\&., it isn\*(Aqt very precisely locked to the true vblank\&.
.SH "RETURNS"
.PP
Non\-zero if timestamp is considered to be very precise, zero otherwise\&.
.SH "AUTHORS"
.PP
\fBJesse Barnes\fR <\&jesse.barnes@intel.com\&>
.br
Intel Corporation, 
	    
	  
.RS 4
Initial version
.RE
.PP
\fBLaurent Pinchart\fR <\&laurent.pinchart@ideasonboard.com\&>
.br
Ideas on board SPRL, 
	    
	  
.RS 4
Driver internals
.RE
.PP
\fBDaniel Vetter\fR <\&daniel.vetter@ffwll.ch\&>
.br
Intel Corporation, 
	    
	  
.RS 4
Contributions all over the place
.RE
.SH "COPYRIGHT"
.br