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    Subject[PATCH v2 24/25] drm/mediatek: respect page offset for PRIME mmap calls
    Date
    From: Yongqiang Niu <yongqiang.niu@mediatek.com>

    Respect page offset for PRIME mmap calls

    Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
    ---
    drivers/gpu/drm/mediatek/mtk_drm_gem.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
    index c230237..524e494 100644
    --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
    +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
    @@ -144,7 +144,6 @@ static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
    * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
    */
    vma->vm_flags &= ~VM_PFNMAP;
    - vma->vm_pgoff = 0;

    ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
    mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
    @@ -183,6 +182,12 @@ int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)

    obj = vma->vm_private_data;

    + /*
    + * 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;
    +
    return mtk_drm_gem_object_mmap(obj, vma);
    }

    --
    1.8.1.1.dirty
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