Patch "drm/exynos: fbdev: Remove offset into screen_buffer" has been added to the 7.1-stable tree

Patch "drm/exynos: fbdev: Remove offset into screen_buffer" has been added to the 7.1-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/exynos: fbdev: Remove offset into screen_buffer

to the 7.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-exynos-fbdev-remove-offset-into-screen_buffer.patch
and it can be found in the queue-7.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From 760bbc58c2c833dec0ee38dd959f4f2f4084fc57 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <tzimmermann@suse.de>
Date: Mon, 11 May 2026 13:54:31 +0200
Subject: drm/exynos: fbdev: Remove offset into screen_buffer

From: Thomas Zimmermann <tzimmermann@suse.de>

commit 760bbc58c2c833dec0ee38dd959f4f2f4084fc57 upstream.

The screen_buffer field in struct fb_info contains the kernel address
of the first byte of framebuffer memory. Do not add the display offset.
This offset only describes scrolling during scanout.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 19c8b8343d9c ("drm/exynos: fixed overlay data updating.")
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: <stable@vger.kernel.org> # v3.2+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/exynos/exynos_drm_fbdev.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -61,17 +61,13 @@ static int exynos_drm_fbdev_update(struc
 	struct fb_info *fbi = helper->info;
 	struct drm_framebuffer *fb = helper->fb;
 	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
-	unsigned long offset;
 
 	fbi->fbops = &exynos_drm_fb_ops;
 
 	drm_fb_helper_fill_info(fbi, helper, sizes);
 
-	offset = fbi->var.xoffset * fb->format->cpp[0];
-	offset += fbi->var.yoffset * fb->pitches[0];
-
 	fbi->flags |= FBINFO_VIRTFB;
-	fbi->screen_buffer = exynos_gem->kvaddr + offset;
+	fbi->screen_buffer = exynos_gem->kvaddr;
 	fbi->screen_size = size;
 	fbi->fix.smem_len = size;
 


Patches currently in stable-queue which might be from tzimmermann@suse.de are

queue-7.1/drm-tests-shmem-set-dma-mask-to-64-bit-in-drm_gem_sh.patch
queue-7.1/drm-exynos-fbdev-remove-offset-into-screen_buffer.patch
queue-7.1/drm-tegra-fbdev-remove-offset-into-framebuffer-memory.patch