drm_gtf_mode

drm_gtf_mode
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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.

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