Name
drm_gtf_mode —
create the modeline based on the GTF algorithm
Synopsis
struct drm_display_mode * drm_gtf_mode ( | struct drm_device * dev, |
| | int hdisplay, |
| | int vdisplay, |
| | int vrefresh, |
| | bool interlaced, |
| | int margins); |
Arguments
dev
drm device
hdisplay
hdisplay size
vdisplay
vdisplay size
vrefresh
vrefresh rate.
interlaced
whether to compute an interlaced mode
margins
desired margin (borders) size
Description
return the modeline based on GTF algorithm
This function is to create the modeline based on the GTF algorithm.
Generalized Timing Formula is derived from
GTF Spreadsheet by Andy Morrish (1/5/97)
available at http
//www.vesa.org
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
Standard GTF parameters
M = 600
C = 40
K = 128
J = 20
Returns
The modeline based on the GTF 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.