From 7ca0b3bf695632003a2a0f98b9fc1451b0483346 Mon Sep 17 00:00:00 2001 From: Knut Petersen Date: Tue, 20 Dec 2005 08:18:09 +0100 Subject: [PATCH] [PATCH] Fix framebuffer console upside-down ywrap scrolling Whenever ywrap scrolling is selected together with 180 degree screen rotation, 2.6.15-rc6 and earlier versions are broken. fb_pan_display() expects non-negative yoffsets, but ud_update_start() calls it with yoffsets down to -(yres - font height). This patch transforms yoffset to the correct range 0 ... vyres-1. Some obviously unneeded parentheses are removed, too. Verified with cyblafb, should be applied before 2.6.15-final because it does fix the framebuffer rotation code introduced early in the 2.6.15 release cycle. Signed-off-by: Knut Petersen Acked-by: Antonino Daplas Signed-off-by: Linus Torvalds --- drivers/video/console/fbcon_ud.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/video/console/fbcon_ud.c b/drivers/video/console/fbcon_ud.c index c4d7c89212b..9dd059e8b64 100644 --- a/drivers/video/console/fbcon_ud.c +++ b/drivers/video/console/fbcon_ud.c @@ -420,13 +420,15 @@ static void ud_cursor(struct vc_data *vc, struct fb_info *info, int ud_update_start(struct fb_info *info) { struct fbcon_ops *ops = info->fbcon_par; - u32 xoffset, yoffset; + int xoffset, yoffset; u32 vyres = GETVYRES(ops->p->scrollmode, info); u32 vxres = GETVXRES(ops->p->scrollmode, info); int err; - xoffset = (vxres - info->var.xres) - ops->var.xoffset; - yoffset = (vyres - info->var.yres) - ops->var.yoffset; + xoffset = vxres - info->var.xres - ops->var.xoffset; + yoffset = vyres - info->var.yres - ops->var.yoffset; + if (yoffset < 0) + yoffset += vyres; ops->var.xoffset = xoffset; ops->var.yoffset = yoffset; err = fb_pan_display(info, &ops->var); -- 2.41.0