drm: add mmap function to prime helpers

This adds to call low-level mmap() from prime helpers.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index ff5fecef367b..85e450e3241c 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -245,7 +245,13 @@ static void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf,
 static int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf,
                 struct vm_area_struct *vma)
 {
-        return -EINVAL;
+        struct drm_gem_object *obj = dma_buf->priv;
+        struct drm_device *dev = obj->dev;
+
+        if (!dev->driver->gem_prime_mmap)
+                return -ENOSYS;
+
+        return dev->driver->gem_prime_mmap(obj, vma);
 }
 
 static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {