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 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-tegra-fbdev-remove-offset-into-framebuffer-memory.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 <[email protected]> know about it.
>From a18b6e30ecd69096beda4a0c96d2570900c3879a Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann <[email protected]>
Date: Tue, 21 Apr 2026 09:29:06 +0200
Subject: drm/tegra: fbdev: Remove offset into framebuffer memory
From: Thomas Zimmermann <[email protected]>
commit a18b6e30ecd69096beda4a0c96d2570900c3879a 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 <[email protected]>
Fixes: de2ba664c30f ("gpu: host1x: drm: Add memory manager and fb")
Cc: [email protected]
Cc: [email protected]
Cc: <[email protected]> # v3.10+
Signed-off-by: Thierry Reding <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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
@@ -76,7 +76,6 @@ int tegra_fbdev_driver_fbdev_probe(struc
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;
@@ -115,9 +114,6 @@ int tegra_fbdev_driver_fbdev_probe(struc
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));
@@ -129,9 +125,9 @@ int tegra_fbdev_driver_fbdev_probe(struc
}
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;
Patches currently in stable-queue which might be from [email protected] 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
