[PATCH 06/13] media: rockchip: rga: set dma mask to 32 bits

[Michael Tretter]

The RGA DMA descriptor list contains only 32-bit addresses. Set the
dma_mask to only allocate memory that is addressable by the descriptors.

This prevents errors when preparing vb2 buffers that were allocated by
the RGA. Imported buffers may still fail the preparation, as they may be
allocated above the 4 GB boundary.

Signed-off-by: Michael Tretter <m.tretter at pengutronix.de>
---
 drivers/media/platform/rockchip/rga/rga.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
index f18fccc7b204..149deb1f1e03 100644
--- a/drivers/media/platform/rockchip/rga/rga.c
+++ b/drivers/media/platform/rockchip/rga/rga.c
@@ -824,6 +824,12 @@ static int rga_probe(struct platform_device *pdev)
 		goto err_put_clk;
 	}
 
+	ret = dma_set_mask(rga->dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(rga->dev, "32-bit DMA not supported");
+		goto err_put_clk;
+	}
+
 	ret = v4l2_device_register(&pdev->dev, &rga->v4l2_dev);
 	if (ret)
 		goto err_put_clk;

-- 
2.39.2