* Patch "drm/tegra: fbdev: Remove offset into framebuffer memory" has been added to the 6.12-stable tree
2026-07-31 11:10 ` [PATCH 6.12.y 2/2] drm/tegra: fbdev: Remove offset into framebuffer memory Sasha Levin
@ 2026-08-07 13:05 ` gregkh
0 siblings, 0 replies; 2+ messages in thread
From: gregkh @ 2026-08-07 13:05 UTC (permalink / raw)
To: dri-devel, gregkh, sashal, treding, tzimmermann; +Cc: stable-commits
This is a note to let you know that I've just added the patch titled
drm/tegra: fbdev: Remove offset into framebuffer memory
to the 6.12-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-tegra-fbdev-remove-offset-into-framebuffer-memory.patch
and it can be found in the queue-6.12 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 stable+bounces-294035-greg=kroah.com@vger.kernel.org Fri Jul 31 13:23:29 2026
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 31 Jul 2026 07:10:52 -0400
Subject: drm/tegra: fbdev: Remove offset into framebuffer memory
To: stable@vger.kernel.org
Cc: Thomas Zimmermann <tzimmermann@suse.de>, dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, Thierry Reding <treding@nvidia.com>, Sasha Levin <sashal@kernel.org>
Message-ID: <20260731111052.3596094-2-sashal@kernel.org>
From: Thomas Zimmermann <tzimmermann@suse.de>
[ Upstream commit a18b6e30ecd69096beda4a0c96d2570900c3879a ]
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: de2ba664c30f ("gpu: host1x: drm: Add memory manager and fb")
Cc: dri-devel@lists.freedesktop.org
Cc: linux-tegra@vger.kernel.org
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/20260421073646.144712-3-tzimmermann@suse.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/tegra/fbdev.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/tegra/fbdev.c
+++ b/drivers/gpu/drm/tegra/fbdev.c
@@ -75,7 +75,6 @@ static int tegra_fbdev_probe(struct drm_
struct fb_info *info = helper->info;
unsigned int bytes_per_pixel;
struct drm_framebuffer *fb;
- unsigned long offset;
struct tegra_bo *bo;
size_t size;
int err;
@@ -112,9 +111,6 @@ static int tegra_fbdev_probe(struct drm_
drm_fb_helper_fill_info(info, helper, sizes);
- offset = info->var.xoffset * bytes_per_pixel +
- info->var.yoffset * fb->pitches[0];
-
if (bo->pages) {
bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
pgprot_writecombine(PAGE_KERNEL));
@@ -126,9 +122,9 @@ static int tegra_fbdev_probe(struct drm_
}
info->flags |= FBINFO_VIRTFB;
- info->screen_buffer = bo->vaddr + offset;
+ info->screen_buffer = bo->vaddr;
info->screen_size = size;
- info->fix.smem_start = (unsigned long)(bo->iova + offset);
+ info->fix.smem_start = (unsigned long)(bo->iova);
info->fix.smem_len = size;
return 0;
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