[PATCH] drm/mediatek: mtk_gem: Partial refactor and use drm_gem_dma_object
Chun-Kuang Hu
chunkuang.hu at kernel.org
Sun Jan 18 15:51:22 PST 2026
Hi, Angelo:
AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com> 於
2025年11月11日週二 上午8:51寫道：
>
> Partially refactor mtk_gem to stop using (and remove) the unneeded
> custom mtk_gem_obj structure and migrate drivers to use the API
> defined drm_gem_dma_object structure instead, and to align all of
> the functions to be similar to the logic from drm_gem_dma_helper.
>
> Unfortunately, for this driver it wasn't possible to directly use
> the drm_gem_dma_helper callbacks (apart from .print_info), as the
> DMA mapping here is done on specific dma devices instead of the
> main DRM device.
>
> Also, since the mtk_gem_obj structure is no more, also migrate the
> mtk_plane.c code to grab the DMA address from a drm_gem_dma_object
> and replace the inclusion of the custom mtk_gem.h header (as it is
> now unneeded) with the DRM API provided drm_gem_dma_helper.
>
> While at it, also set DRM_GEM_DMA_HELPER as an unconditional
> dependency (remove the `if DRM_FBDEV_EMULATION` from the select
> DRM_GEM_DMA_HELPER statement in Kconfig).
>
> This resolves an issue pointed by UBSAN, as when using drm_fbdev_dma
> the drm_gem_object is supposed to be child of a drm_gem_dma_object
> instead of a custom mtk_gem_obj (or the mtk_gem_obj should have been
> reordered to have the same fields as drm_gem_dma_object, but that
> would have been too fragile and generally a bad idea anyway).
Applied to mediatek-drm-fixes [1], thanks.
[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-fixes
Regards,
Chun-Kuang.
>
> Fixes: 0992284b4fe4 ("drm/mediatek: Use fbdev-dma")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> ---
>
> For reference, the UBSAN warning:
>
> [ 7.049322] mediatek-drm mediatek-drm.6.auto: bound 1c110000.merge (ops mtk_disp_merge_component_ops [mediatek_drm])
> [ 7.049414] mediatek-drm mediatek-drm.4.auto: Not creating crtc 1 because component 9 is disabled or missing
> [ 7.063371] [drm] Initialized mediatek 1.0.0 for mediatek-drm.4.auto on minor 1
> [ 7.064544] ------------[ cut here ]------------
> [ 7.064552] UBSAN: invalid-load in /build/linux-genio/drivers/gpu/drm/drm_fbdev_dma.c:212:13
> [ 7.066759] load of value 20 is not a valid value for type '_Bool'
> [ 7.068537] CPU: 6 UID: 0 PID: 444 Comm: kworker/u32:8 Not tainted 6.17.0-next-20251007+ #1187 PREEMPT(full)
> [ 7.068543] Hardware name: Acer Tomato (rev2) board (DT)
> [ 7.068545] Workqueue: events_unbound deferred_probe_work_func
> [ 7.068555] Call trace:
> [ 7.068557] show_stack+0x34/0xd8 (C)
> [ 7.068564] dump_stack_lvl+0x80/0xc0
> [ 7.068568] dump_stack+0x1c/0x40
> [ 7.068571] ubsan_epilogue+0x14/0x60
> [ 7.068575] __ubsan_handle_load_invalid_value+0xb8/0xe0
> [ 7.068579] drm_fbdev_dma_driver_fbdev_probe_tail.isra.0+0x1d0/0x1f0 [drm_dma_helper]
> [ 7.068588] drm_fbdev_dma_driver_fbdev_probe+0x20c/0x2a0 [drm_dma_helper]
> [ 7.068591] drm_fb_helper_single_fb_probe+0xbc/0x220
> [ 7.068595] __drm_fb_helper_initial_config_and_unlock+0x3c/0x170
> [ 7.068597] drm_fb_helper_initial_config+0x4c/0x98
> [ 7.068599] drm_fbdev_client_hotplug+0x9c/0x100
> [ 7.068603] drm_client_register+0x64/0xd0
> [ 7.068605] drm_fbdev_client_setup+0xf8/0x260
> [ 7.068608] drm_client_setup+0xfc/0x130
> [ 7.068610] mtk_drm_bind+0x110/0x218 [mediatek_drm]
> [ 7.068622] try_to_bring_up_aggregate_device+0xcc/0x1b0
> [ 7.068625] __component_add+0x12c/0x218
> [ 7.068627] component_add+0x20/0x48
> [ 7.068629] mtk_disp_rdma_probe+0x1b0/0x308 [mediatek_drm]
> [ 7.068635] platform_probe+0x70/0x128
> [ 7.068638] really_probe+0xd8/0x3e8
> [ 7.068640] __driver_probe_device+0x94/0x1a8
> [ 7.068642] driver_probe_device+0x4c/0x1a0
> [ 7.068644] __device_attach_driver+0x10c/0x238
> [ 7.068645] bus_for_each_drv+0x94/0x120
> [ 7.068647] __device_attach+0xa8/0x210
> [ 7.068648] device_initial_probe+0x20/0x50
> [ 7.068650] bus_probe_device+0xc0/0xd8
> [ 7.068652] deferred_probe_work_func+0xac/0x120
> [ 7.068654] process_one_work+0x174/0x428
> [ 7.068658] worker_thread+0x310/0x440
> [ 7.068661] kthread+0x110/0x130
> [ 7.068663] ret_from_fork+0x10/0x20
> [ 7.068667] ---[ end trace ]---
>
> drivers/gpu/drm/mediatek/Kconfig | 2 +-
> drivers/gpu/drm/mediatek/mtk_gem.c | 267 +++++++++++----------------
> drivers/gpu/drm/mediatek/mtk_gem.h | 33 +---
> drivers/gpu/drm/mediatek/mtk_plane.c | 8 +-
> 4 files changed, 110 insertions(+), 200 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
> index e47debd60619..5bd024fcbfa1 100644
> --- a/drivers/gpu/drm/mediatek/Kconfig
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -8,7 +8,7 @@ config DRM_MEDIATEK
> depends on OF
> depends on MTK_MMSYS
> select DRM_CLIENT_SELECTION
> - select DRM_GEM_DMA_HELPER if DRM_FBDEV_EMULATION
> + select DRM_GEM_DMA_HELPER
> select DRM_KMS_HELPER
> select DRM_DISPLAY_HELPER
> select DRM_BRIDGE_CONNECTOR
> diff --git a/drivers/gpu/drm/mediatek/mtk_gem.c b/drivers/gpu/drm/mediatek/mtk_gem.c
> index a172456d1d7b..c19844bb2fde 100644
> --- a/drivers/gpu/drm/mediatek/mtk_gem.c
> +++ b/drivers/gpu/drm/mediatek/mtk_gem.c
> @@ -1,6 +1,8 @@
> // SPDX-License-Identifier: GPL-2.0-only
> /*
> * Copyright (c) 2015 MediaTek Inc.
> + * Copyright (c) 2025 Collabora Ltd.
> + * AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> */
>
> #include <linux/dma-buf.h>
> @@ -17,24 +19,64 @@
>
> static int mtk_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
>
> -static const struct vm_operations_struct vm_ops = {
> - .open = drm_gem_vm_open,
> - .close = drm_gem_vm_close,
> -};
> +static void mtk_gem_free_object(struct drm_gem_object *obj)
> +{
> + struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
> + struct mtk_drm_private *priv = obj->dev->dev_private;
> +
> + if (dma_obj->sgt)
> + drm_prime_gem_destroy(obj, dma_obj->sgt);
> + else
> + dma_free_wc(priv->dma_dev, dma_obj->base.size,
> + dma_obj->vaddr, dma_obj->dma_addr);
> +
> + /* release file pointer to gem object. */
> + drm_gem_object_release(obj);
> +
> + kfree(dma_obj);
> +}
> +
> +/*
> + * Allocate a sg_table for this GEM object.
> + * Note: Both the table's contents, and the sg_table itself must be freed by
> + * the caller.
> + * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
> + */
> +static struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
> +{
> + struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
> + struct mtk_drm_private *priv = obj->dev->dev_private;
> + struct sg_table *sgt;
> + int ret;
> +
> + sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
> + if (!sgt)
> + return ERR_PTR(-ENOMEM);
> +
> + ret = dma_get_sgtable(priv->dma_dev, sgt, dma_obj->vaddr,
> + dma_obj->dma_addr, obj->size);
> + if (ret) {
> + DRM_ERROR("failed to allocate sgt, %d\n", ret);
> + kfree(sgt);
> + return ERR_PTR(ret);
> + }
> +
> + return sgt;
> +}
>
> static const struct drm_gem_object_funcs mtk_gem_object_funcs = {
> .free = mtk_gem_free_object,
> + .print_info = drm_gem_dma_object_print_info,
> .get_sg_table = mtk_gem_prime_get_sg_table,
> - .vmap = mtk_gem_prime_vmap,
> - .vunmap = mtk_gem_prime_vunmap,
> + .vmap = drm_gem_dma_object_vmap,
> .mmap = mtk_gem_object_mmap,
> - .vm_ops = &vm_ops,
> + .vm_ops = &drm_gem_dma_vm_ops,
> };
>
> -static struct mtk_gem_obj *mtk_gem_init(struct drm_device *dev,
> - unsigned long size)
> +static struct drm_gem_dma_object *mtk_gem_init(struct drm_device *dev,
> + unsigned long size, bool private)
> {
> - struct mtk_gem_obj *mtk_gem_obj;
> + struct drm_gem_dma_object *dma_obj;
> int ret;
>
> size = round_up(size, PAGE_SIZE);
> @@ -42,86 +84,65 @@ static struct mtk_gem_obj *mtk_gem_init(struct drm_device *dev,
> if (size == 0)
> return ERR_PTR(-EINVAL);
>
> - mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
> - if (!mtk_gem_obj)
> + dma_obj = kzalloc(sizeof(*dma_obj), GFP_KERNEL);
> + if (!dma_obj)
> return ERR_PTR(-ENOMEM);
>
> - mtk_gem_obj->base.funcs = &mtk_gem_object_funcs;
> + dma_obj->base.funcs = &mtk_gem_object_funcs;
>
> - ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
> - if (ret < 0) {
> + if (private) {
> + ret = 0;
> + drm_gem_private_object_init(dev, &dma_obj->base, size);
> + } else {
> + ret = drm_gem_object_init(dev, &dma_obj->base, size);
> + }
> + if (ret) {
> DRM_ERROR("failed to initialize gem object\n");
> - kfree(mtk_gem_obj);
> + kfree(dma_obj);
> return ERR_PTR(ret);
> }
>
> - return mtk_gem_obj;
> + return dma_obj;
> }
>
> -struct mtk_gem_obj *mtk_gem_create(struct drm_device *dev,
> - size_t size, bool alloc_kmap)
> +static struct drm_gem_dma_object *mtk_gem_create(struct drm_device *dev, size_t size)
> {
> struct mtk_drm_private *priv = dev->dev_private;
> - struct mtk_gem_obj *mtk_gem;
> + struct drm_gem_dma_object *dma_obj;
> struct drm_gem_object *obj;
> int ret;
>
> - mtk_gem = mtk_gem_init(dev, size);
> - if (IS_ERR(mtk_gem))
> - return ERR_CAST(mtk_gem);
> -
> - obj = &mtk_gem->base;
> -
> - mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
> + dma_obj = mtk_gem_init(dev, size, false);
> + if (IS_ERR(dma_obj))
> + return ERR_CAST(dma_obj);
>
> - if (!alloc_kmap)
> - mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
> + obj = &dma_obj->base;
>
> - mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
> - &mtk_gem->dma_addr, GFP_KERNEL,
> - mtk_gem->dma_attrs);
> - if (!mtk_gem->cookie) {
> + dma_obj->vaddr = dma_alloc_wc(priv->dma_dev, obj->size,
> + &dma_obj->dma_addr,
> + GFP_KERNEL | __GFP_NOWARN);
> + if (!dma_obj->vaddr) {
> DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
> ret = -ENOMEM;
> goto err_gem_free;
> }
>
> - if (alloc_kmap)
> - mtk_gem->kvaddr = mtk_gem->cookie;
> -
> - DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
> - mtk_gem->cookie, &mtk_gem->dma_addr,
> + DRM_DEBUG_DRIVER("vaddr = %p dma_addr = %pad size = %zu\n",
> + dma_obj->vaddr, &dma_obj->dma_addr,
> size);
>
> - return mtk_gem;
> + return dma_obj;
>
> err_gem_free:
> drm_gem_object_release(obj);
> - kfree(mtk_gem);
> + kfree(dma_obj);
> return ERR_PTR(ret);
> }
>
> -void mtk_gem_free_object(struct drm_gem_object *obj)
> -{
> - struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> - struct mtk_drm_private *priv = obj->dev->dev_private;
> -
> - if (mtk_gem->sg)
> - drm_prime_gem_destroy(obj, mtk_gem->sg);
> - else
> - dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
> - mtk_gem->dma_addr, mtk_gem->dma_attrs);
> -
> - /* release file pointer to gem object. */
> - drm_gem_object_release(obj);
> -
> - kfree(mtk_gem);
> -}
> -
> int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
> struct drm_mode_create_dumb *args)
> {
> - struct mtk_gem_obj *mtk_gem;
> + struct drm_gem_dma_object *dma_obj;
> int ret;
>
> args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
> @@ -134,25 +155,24 @@ int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
> args->size = args->pitch;
> args->size *= args->height;
>
> - mtk_gem = mtk_gem_create(dev, args->size, false);
> - if (IS_ERR(mtk_gem))
> - return PTR_ERR(mtk_gem);
> + dma_obj = mtk_gem_create(dev, args->size);
> + if (IS_ERR(dma_obj))
> + return PTR_ERR(dma_obj);
>
> /*
> * allocate a id of idr table where the obj is registered
> * and handle has the id what user can see.
> */
> - ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
> + ret = drm_gem_handle_create(file_priv, &dma_obj->base, &args->handle);
> + /* drop reference from allocate - handle holds it now. */
> + drm_gem_object_put(&dma_obj->base);
> if (ret)
> goto err_handle_create;
>
> - /* drop reference from allocate - handle holds it now. */
> - drm_gem_object_put(&mtk_gem->base);
> -
> return 0;
>
> err_handle_create:
> - mtk_gem_free_object(&mtk_gem->base);
> + mtk_gem_free_object(&dma_obj->base);
> return ret;
> }
>
> @@ -160,129 +180,50 @@ static int mtk_gem_object_mmap(struct drm_gem_object *obj,
> struct vm_area_struct *vma)
>
> {
> - int ret;
> - struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> + struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
> struct mtk_drm_private *priv = obj->dev->dev_private;
> + int ret;
>
> /*
> * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
> * whole buffer from the start.
> */
> - vma->vm_pgoff = 0;
> + vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
>
> /*
> * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
> * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
> */
> - vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
> + vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP);
> +
> vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
> vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
>
> - ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
> - mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
> + ret = dma_mmap_wc(priv->dma_dev, vma, dma_obj->vaddr,
> + dma_obj->dma_addr, obj->size);
> + if (ret)
> + drm_gem_vm_close(vma);
>
> return ret;
> }
>
> -/*
> - * Allocate a sg_table for this GEM object.
> - * Note: Both the table's contents, and the sg_table itself must be freed by
> - * the caller.
> - * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
> - */
> -struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
> -{
> - struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> - struct mtk_drm_private *priv = obj->dev->dev_private;
> - struct sg_table *sgt;
> - int ret;
> -
> - sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
> - if (!sgt)
> - return ERR_PTR(-ENOMEM);
> -
> - ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
> - mtk_gem->dma_addr, obj->size,
> - mtk_gem->dma_attrs);
> - if (ret) {
> - DRM_ERROR("failed to allocate sgt, %d\n", ret);
> - kfree(sgt);
> - return ERR_PTR(ret);
> - }
> -
> - return sgt;
> -}
> -
> struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
> - struct dma_buf_attachment *attach, struct sg_table *sg)
> + struct dma_buf_attachment *attach, struct sg_table *sgt)
> {
> - struct mtk_gem_obj *mtk_gem;
> + struct drm_gem_dma_object *dma_obj;
>
> /* check if the entries in the sg_table are contiguous */
> - if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
> + if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
> DRM_ERROR("sg_table is not contiguous");
> return ERR_PTR(-EINVAL);
> }
>
> - mtk_gem = mtk_gem_init(dev, attach->dmabuf->size);
> - if (IS_ERR(mtk_gem))
> - return ERR_CAST(mtk_gem);
> -
> - mtk_gem->dma_addr = sg_dma_address(sg->sgl);
> - mtk_gem->sg = sg;
> -
> - return &mtk_gem->base;
> -}
> -
> -int mtk_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
> -{
> - struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> - struct sg_table *sgt = NULL;
> - unsigned int npages;
> -
> - if (mtk_gem->kvaddr)
> - goto out;
> -
> - sgt = mtk_gem_prime_get_sg_table(obj);
> - if (IS_ERR(sgt))
> - return PTR_ERR(sgt);
> -
> - npages = obj->size >> PAGE_SHIFT;
> - mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
> - if (!mtk_gem->pages) {
> - sg_free_table(sgt);
> - kfree(sgt);
> - return -ENOMEM;
> - }
> -
> - drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
> -
> - mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
> - pgprot_writecombine(PAGE_KERNEL));
> - if (!mtk_gem->kvaddr) {
> - sg_free_table(sgt);
> - kfree(sgt);
> - kfree(mtk_gem->pages);
> - return -ENOMEM;
> - }
> - sg_free_table(sgt);
> - kfree(sgt);
> -
> -out:
> - iosys_map_set_vaddr(map, mtk_gem->kvaddr);
> -
> - return 0;
> -}
> -
> -void mtk_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
> -{
> - struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
> - void *vaddr = map->vaddr;
> + dma_obj = mtk_gem_init(dev, attach->dmabuf->size, true);
> + if (IS_ERR(dma_obj))
> + return ERR_CAST(dma_obj);
>
> - if (!mtk_gem->pages)
> - return;
> + dma_obj->dma_addr = sg_dma_address(sgt->sgl);
> + dma_obj->sgt = sgt;
>
> - vunmap(vaddr);
> - mtk_gem->kvaddr = NULL;
> - kfree(mtk_gem->pages);
> + return &dma_obj->base;
> }
> diff --git a/drivers/gpu/drm/mediatek/mtk_gem.h b/drivers/gpu/drm/mediatek/mtk_gem.h
> index 66e5f154f698..afebc3a970a8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_gem.h
> +++ b/drivers/gpu/drm/mediatek/mtk_gem.h
> @@ -7,42 +7,11 @@
> #define _MTK_GEM_H_
>
> #include <drm/drm_gem.h>
> +#include <drm/drm_gem_dma_helper.h>
>
> -/*
> - * mtk drm buffer structure.
> - *
> - * @base: a gem object.
> - * - a new handle to this gem object would be created
> - * by drm_gem_handle_create().
> - * @cookie: the return value of dma_alloc_attrs(), keep it for dma_free_attrs()
> - * @kvaddr: kernel virtual address of gem buffer.
> - * @dma_addr: dma address of gem buffer.
> - * @dma_attrs: dma attributes of gem buffer.
> - *
> - * P.S. this object would be transferred to user as kms_bo.handle so
> - * user can access the buffer through kms_bo.handle.
> - */
> -struct mtk_gem_obj {
> - struct drm_gem_object base;
> - void *cookie;
> - void *kvaddr;
> - dma_addr_t dma_addr;
> - unsigned long dma_attrs;
> - struct sg_table *sg;
> - struct page **pages;
> -};
> -
> -#define to_mtk_gem_obj(x) container_of(x, struct mtk_gem_obj, base)
> -
> -void mtk_gem_free_object(struct drm_gem_object *gem);
> -struct mtk_gem_obj *mtk_gem_create(struct drm_device *dev, size_t size,
> - bool alloc_kmap);
> int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
> struct drm_mode_create_dumb *args);
> -struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);
> struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
> struct dma_buf_attachment *attach, struct sg_table *sg);
> -int mtk_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map);
> -void mtk_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map);
>
> #endif
> diff --git a/drivers/gpu/drm/mediatek/mtk_plane.c b/drivers/gpu/drm/mediatek/mtk_plane.c
> index 1b5667ddbb03..2c632c171b73 100644
> --- a/drivers/gpu/drm/mediatek/mtk_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_plane.c
> @@ -11,12 +11,12 @@
> #include <drm/drm_fourcc.h>
> #include <drm/drm_framebuffer.h>
> #include <drm/drm_gem_atomic_helper.h>
> +#include <drm/drm_gem_dma_helper.h>
> #include <linux/align.h>
>
> #include "mtk_crtc.h"
> #include "mtk_ddp_comp.h"
> #include "mtk_drm_drv.h"
> -#include "mtk_gem.h"
> #include "mtk_plane.h"
>
> static const u64 modifiers[] = {
> @@ -135,8 +135,8 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
> struct mtk_plane_state *mtk_plane_state)
> {
> struct drm_framebuffer *fb = new_state->fb;
> + struct drm_gem_dma_object *dma_obj;
> struct drm_gem_object *gem;
> - struct mtk_gem_obj *mtk_gem;
> unsigned int pitch, format;
> u64 modifier;
> dma_addr_t addr;
> @@ -145,8 +145,8 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
> int offset;
>
> gem = fb->obj[0];
> - mtk_gem = to_mtk_gem_obj(gem);
> - addr = mtk_gem->dma_addr;
> + dma_obj = to_drm_gem_dma_obj(gem);
> + addr = dma_obj->dma_addr;
> pitch = fb->pitches[0];
> format = fb->format->format;
> modifier = fb->modifier;
> --
> 2.51.1
>
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