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fbdev: fix FB console blanking 

The commit aef7db4bd5 fixed the problem with
recursive locking in fb blanking code if blank is caused by user setting
the /sys/class/graphics/fb*/blank.  However this broke the fbcon timeout
blanking.

If you use a driver that defines ->fb_blank operation and at the same time
that driver relies on other driver (e.g.  backlight or lcd class) to blank
the screen, when the fbcon times out and tries to blank the fb, it will
call only fb driver blanker and won't notify the other driver.  Thus FB
output is disabled, but the screen isn't blanked.

Restore fbcon blanking and at the same time apply the proper fix for the
above problem: if fbcon_blank is called with FBINFO_FLAG_USEREVENT, we are
already called through notification from fb_blank, thus we don't have to
blank the fb again.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Baryshkov 2008-12-01 13:14:05 -08:00 committed by Linus Torvalds
parent 0380155363
commit bca404afdc
1 changed files with 3 additions and 6 deletions
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9
drivers/video/console/fbcon.c
View File

@ -2389,16 +2389,13 @@ static int fbcon_blank(struct vc_data *vc, int blank, int mode_switch)
if (!fbcon_is_inactive(vc, info)) {
if (ops->blank_state != blank) {
int ret = 1;
ops->blank_state = blank;
fbcon_cursor(vc, blank ? CM_ERASE : CM_DRAW);
ops->cursor_flash = (!blank);
if (info->fbops->fb_blank)
ret = info->fbops->fb_blank(blank, info);
if (ret)
fbcon_generic_blank(vc, info, blank);
if (!(info->flags & FBINFO_MISC_USEREVENT))
if (fb_blank(info, blank))
fbcon_generic_blank(vc, info, blank);
}
if (!blank)