'\" t
.\"     Title: drm_gtf_mode
.\"    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_GTF_MODE" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "DRM Core"
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.SH "NAME"
drm_gtf_mode \- create the modeline based on the GTF algorithm
.SH "SYNOPSIS"
.HP \w'struct\ drm_display_mode\ *\ drm_gtf_mode('u
.BI "struct drm_display_mode * drm_gtf_mode(struct\ drm_device\ *\ " "dev" ", int\ " "hdisplay" ", int\ " "vdisplay" ", int\ " "vrefresh" ", bool\ " "interlaced" ", int\ " "margins" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
drm device
.RE
.PP
\fIhdisplay\fR
.RS 4
hdisplay size
.RE
.PP
\fIvdisplay\fR
.RS 4
vdisplay size
.RE
.PP
\fIvrefresh\fR
.RS 4
vrefresh rate\&.
.RE
.PP
\fIinterlaced\fR
.RS 4
whether to compute an interlaced mode
.RE
.PP
\fImargins\fR
.RS 4
desired margin (borders) size
.RE
.SH "DESCRIPTION"
.PP
return the modeline based on GTF algorithm
.PP
This function is to create the modeline based on the GTF algorithm\&.
.SH "GENERALIZED TIMING FORMULA IS DERIVED FROM"
.PP
GTF Spreadsheet by Andy Morrish (1/5/97)
.SH "AVAILABLE AT HTTP"
.PP
//www\&.vesa\&.org
.PP
And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf\&.c\&. What I have done is to translate it by using integer calculation\&. I also refer to the function of fb_get_mode in the file of drivers/video/fbmon\&.c
.SH "STANDARD GTF PARAMETERS"
.PP
M = 600 C = 40 K = 128 J = 20
.SH "RETURNS"
.PP
The modeline based on the GTF algorithm stored in a drm_display_mode object\&. The display mode object is allocated with
\fBdrm_mode_create\fR\&. Returns NULL when no mode could be allocated\&.
.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