Commit 39942fd8 authored Dec 12, 2005 by Knut Petersen Committed by Linus Torvalds Dec 12, 2005

[PATCH] fbdev: fix switch to KD_TEXT, enhanced version



Every framebuffer driver relies on the assumption that the set_par()
function of the driver is called before drawing functions and other
functions dependent on the hardware state are executed.

Whenever you switch from X to a framebuffer console for the very first
time, there is a chance that a broken X system has _not_ set the mode to
KD_GRAPHICS, thus the vt and framebuffer code executes a screen redraw and
several other functions before a set_par() is executed.  This is believed
to be not a bug of linux but a bug of X/xdm.  At least some X releases used
by SuSE and Debian show this behaviour.

There was a 2nd case, but that has been fixed by Antonino Daplas on
10-dec-2005.

This patch allows drivers to set a flag to inform fbcon_switch() that they
prefer a set_par() call on every console switch, working around the
problems caused by the broken X releases.

The flag will be used by the next release of cyblafb and might help other
drivers that assume a hardware state different to the one used by X.

As the default behaviour does not change, this patch should be acceptable
to everybody.

Signed-off-by: Knut Petersen <Knut_Petersen@t-online.de>
Acked-by: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent 4e1567d3

drivers/video/console/fbcon.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2103,7 +2103,8 @@ static int fbcon_switch(struct vc_data *vc)
		fb_set_var(info, &var);
		ops->var = info->var;

		if (old_info != NULL && old_info != info) {
		if (old_info != NULL && (old_info != info \|\|
		info->flags & FBINFO_MISC_ALWAYS_SETPAR)) {
		if (info->fbops->fb_set_par)
		info->fbops->fb_set_par(info);
		fbcon_del_cursor_timer(old_info);

include/linux/fb.h

+12 −0

Original line number	Diff line number	Diff line
		@@ -732,6 +732,18 @@ struct fb_tile_ops {
		from userspace */
		#define FBINFO_MISC_TILEBLITTING 0x20000 /* use tile blitting */

		/* A driver may set this flag to indicate that it does want a set_par to be
		* called every time when fbcon_switch is executed. The advantage is that with
		* this flag set you can really be shure that set_par is always called before
		* any of the functions dependant on the correct hardware state or altering
		* that state, even if you are using some broken X releases. The disadvantage
		* is that it introduces unwanted delays to every console switch if set_par
		* is slow. It is a good idea to try this flag in the drivers initialization
		* code whenever there is a bug report related to switching between X and the
		* framebuffer console.
		*/
		#define FBINFO_MISC_ALWAYS_SETPAR 0x40000

		struct fb_info {
		int node;
		int flags;