Patch "drm/tegra: fbdev: Remove offset into framebuffer memory" has been added to the 6.12-stable tree

[<gregkh@linuxfoundation.org>]

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;


Patches currently in stable-queue which might be from sashal@kernel.org are

queue-6.12/wifi-brcmfmac-set-f2-blocksize-to-256-for-bcm43752.patch
queue-6.12/net-dsa-mt7530-check-bus-read-errors-in-the-mdio-reg.patch
queue-6.12/um-set-parent-death-signal-for-userspace-process.patch
queue-6.12/usb-gadget-f_tcm-synchronize-delayed-set_alt-with-teardown.patch
queue-6.12/drm-xe-rtp-de-whitelist-oa-registers-for-all-hwe-s-f.patch
queue-6.12/media-uapi-rkisp-correct-name-version-enum.patch
queue-6.12/net-sxgbe-free-tx-rings-on-rx-allocation-failure.patch
queue-6.12/rtase-fix-double-free-of-multi-frag-skb-on-dma-map-f.patch
queue-6.12/usb-typec-ucsi-fix-race-condition-and-ordering-in-port-unregistration.patch
queue-6.12/drm-xe-introduce-xe_gt_dbg_printer.patch
queue-6.12/drm-fb-helper-allocate-and-release-fb_info-in-single-place.patch
queue-6.12/drm-xe-rtp-maintain-oa-whitelists-separately.patch
queue-6.12/pinctrl-qcom-sc8280xp-add-missing-wakeup-entries-for.patch
queue-6.12/forcedeth-fix-uaf-of-txrx_stats-in-nv_remove.patch
queue-6.12/alsa-hda-codecs-hdmi-disable-keep-alive-before-audio-format-change.patch
queue-6.12/hid-logitech-dj-standardise-hid_report_enum-variable.patch
queue-6.12/scsi-libsas-fix-ha-resume-deadlock-and-hisi_sas-disk.patch
queue-6.12/netfilter-nft_payload-fix-mask-build-for-partial-fie.patch
queue-6.12/bluetooth-iso-fix-timeout-vs-sync_timeout-typo-in-ch.patch
queue-6.12/um-set-parent-death-signal-for-ubd-io-thread-process.patch
queue-6.12/net-sxgbe-check-descriptor-ring-allocation-failures.patch
queue-6.12/ipvs-fix-the-checksum-validations.patch
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queue-6.12/ata-sata_mv-accept-1-or-2-resources-in-platform-prob.patch
queue-6.12/drm-xe-rtp-generalize-whitelist_apply_to_hwe.patch
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queue-6.12/drm-xe-oa-de-whitelist-oa-registers-on-oa-stream-ope.patch
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