[PATCH v3 02/15] drm/rockchip: Set dma mask to 64 bit

[Andy Yan]

From: Andy Yan <andy.yan@xxxxxxxxxxxxxx>

The vop mmu support translate physical address upper 4 GB to iova
below 4 GB. So set dma mask to 64 bit to indicate we support address
> 4GB.

This can avoid warnging message like this on some boards with DDR
> 4 GB:

rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 130 (slots)
rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 0 (slots)
rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 130 (slots)
rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 130 (slots)
rockchip-drm display-subsystem: swiotlb buffer is full (sz: 266240 bytes), total 32768 (slots), used 0 (slots)

Signed-off-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
Tested-by: Derek Foreman <derek.foreman@xxxxxxxxxxxxx>
---

(no changes since v1)

 drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 04ef7a2c3833..8bc2ff3b04bb 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -445,7 +445,9 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	return 0;
+	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
+
+	return ret;
 }
 
 static void rockchip_drm_platform_remove(struct platform_device *pdev)
-- 
2.34.1