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drm/tegra: fbdev: Remove offset into framebuffer memory

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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: de2ba664c3 ("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
This commit is contained in:
Thomas Zimmermann 2026-04-21 09:29:06 +02:00 committed by Thierry Reding
parent d23bd83f3e
commit a18b6e30ec
1 changed files with 2 additions and 6 deletions
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8
drivers/gpu/drm/tegra/fbdev.c
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@ -76,7 +76,6 @@ int tegra_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
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(struct drm_fb_helper *helper,
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(struct drm_fb_helper *helper,
}
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;