linux-kernel - [RFC PATCH 3/4] of/device: Set bus DMA mask as appropriate

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Date:   Tue, 10 Jul 2018 18:17:18 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     hch@....de, m.szyprowski@...sung.com,
        iommu@...ts.linux-foundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        lorenzo.pieralisi@....com, hanjun.guo@...aro.org,
        sudeep.holla@....com, robh+dt@...nel.org, frowand.list@...il.com,
        gregkh@...uxfoundation.org, joro@...tes.org, x86@...nel.org
Subject: [RFC PATCH 3/4] of/device: Set bus DMA mask as appropriate

When an explicit DMA limit is described by firmware, we need to remember
it regardless of how drivers might subsequently update their devices'
masks. The new bus_dma_mask field does that.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/of/device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 33d85511d790..0d39633e8545 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -149,6 +149,7 @@ int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma)
 	 * set by the driver.
 	 */
 	mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
+	dev->bus_dma_mask = mask;
 	dev->coherent_dma_mask &= mask;
 	*dev->dma_mask &= mask;
 
-- 
2.17.1.dirty