Hi, Yongqiang: On Wed, 2019-03-27 at 14:19 +0800, yongqiang.niu@xxxxxxxxxxxx wrote: > From: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> > > Respect page offset for PRIME mmap calls Reviewed-by: CK Hu <ck.hu@xxxxxxxxxxxx> > > Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx> > --- > 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); > } >
