fbdev: Wrap user-invoked calls to fb_set_var() in helper

Handle fbcon during display updates in fb_set_var_from_user(). Check
with fbcon if the mode change is possible, update hardware state and
finally update fbcon. Update all callers.

Only the FBIOPUT_VSCREENINFO ioctl currently does all steps. Other
mode-changes callers in sysfs and driver code are missing fbcon-related
steps.

With the new helper, ps3fb and sh_mobile_lcdcfb no longer maintain
fbcon state themselves.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/ps3fb.c

@@ -29,7 +29,6 @@
 #include <linux/freezer.h>
 #include <linux/uaccess.h>
 #include <linux/fb.h>
-#include <linux/fbcon.h>
 #include <linux/init.h>
 
 #include <asm/cell-regs.h>
@@ -830,9 +829,7 @@ static int ps3fb_ioctl(struct fb_info *info, unsigned int cmd,
 				/* Force, in case only special bits changed */
 				var.activate |= FB_ACTIVATE_FORCE;
 				par->new_mode_id = val;
-				retval = fb_set_var(info, &var);
-				if (!retval)
-					fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
+				retval = fb_set_var_from_user(info, &var);
 				console_unlock();
 			}
 			break;