[PATCH v2 1/4] drm/rcar-du: Use drm_gem_dma_get_sg_table() helper to get scatter gather table

[Chen-Yu Tsai]

The rcar-du driver is directly calling dma_get_sgtable() on a
drm_gem_dma_object. Not passing the dma_attrs field in may cause
problems when DMA_ATTR_NO_KERNEL_MAPPING is added to the GEM DMA
helpers gain support later.

Instead, use the drm_gem_dma_get_sg_table() helper to get the scatter
gather table.

Signed-off-by: Chen-Yu Tsai <wenst at chromium.org>
---
Changes since v1:
- new patch

Not sure if we should add a helper like drm_fb_dma_get_gem_addr(). This
seems to be the only driver that is using a scatter gather table to pass
DMA addresses.
---
 drivers/gpu/drm/renesas/rcar-du/rcar_du_vsp.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_vsp.c
index 94c22d2db197..6a62608ee3a9 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_vsp.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_vsp.c
@@ -291,10 +291,16 @@ int rcar_du_vsp_map_fb(struct rcar_du_vsp *vsp, struct drm_framebuffer *fb,
 				dst = sg_next(dst);
 			}
 		} else {
-			ret = dma_get_sgtable(rcdu->dev, sgt, gem->vaddr,
-					      gem->dma_addr, gem->base.size);
-			if (ret)
+			struct sg_table *ret_sgt;
+
+			ret_sgt = drm_gem_dma_get_sg_table(gem);
+			if (IS_ERR(ret_sgt)) {
+				ret = PTR_ERR(ret_sgt);
 				goto fail;
+			}
+
+			memcpy(sgt, ret_sgt, sizeof(*sgt));
+			kfree(ret_sgt);
 		}
 
 		ret = vsp1_du_map_sg(vsp->vsp, sgt);
-- 
2.53.0.851.ga537e3e6e9-goog