drm_cvt_mode: Create a modeline based on the cvt algorithm

SYNOPSIS

struct drm_display_mode * drm_cvt_mode(struct drm_device * dev, int hdisplay, int vdisplay, int vrefresh, bool reduced, bool interlaced, bool margins);

ARGUMENTS

dev

drm device

hdisplay

hdisplay size

vdisplay

vdisplay size

vrefresh

vrefresh rate

reduced

whether to use reduced blanking

interlaced

whether to compute an interlaced mode

margins

whether to add margins (borders)

DESCRIPTION

This function is called to generate the modeline based on CVT algorithm according to the hdisplay, vdisplay, vrefresh. It is based from the VESA(TM) Coordinated Video Timing Generator by Graham Loveridge April 9, 2003 available at

HTTP

//www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls

And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c. What I have done is to translate it by using integer calculation.

RETURNS

The modeline based on the CVT algorithm stored in a drm_display_mode object. The display mode object is allocated with drm_mode_create. Returns NULL when no mode could be allocated.

AUTHORS

Jesse Barnes <[email protected]>

Intel Corporation,

Initial version

Laurent Pinchart <[email protected]>

Ideas on board SPRL,

Driver internals

Daniel Vetter <[email protected]>