From: Yongqiang Niu <yongqiang....@mediatek.com>
Respect page offset for PRIME mmap calls
Signed-off-by: Yongqiang Niu <yongqiang....@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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