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From:   Robin Murphy <robin.murphy@arm.com>
To:     hch@lst.de, m.szyprowski@samsung.com,
        iommu@lists.linux-foundation.org
Cc:     linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        lorenzo.pieralisi@arm.com, hanjun.guo@linaro.org,
        sudeep.holla@arm.com, robh+dt@kernel.org, frowand.list@gmail.com,
        gregkh@linuxfoundation.org, joro@8bytes.org, x86@kernel.org
Subject: [RFC PATCH 2/4] ACPI/IORT: Set bus DMA mask as appropriate
Date:   Tue, 10 Jul 2018 18:17:17 +0100
Message-Id: <c604b3eae4103ee0ad6da84baa1bc893a81ef5f8.1531239284.git.robin.murphy@arm.com>
In-Reply-To: <cover.1531239284.git.robin.murphy@arm.com>
References: <cover.1531239284.git.robin.murphy@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@arm.com>
---
 drivers/acpi/arm64/iort.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 4a66896e2aa3..bc51cff5505e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1014,6 +1014,7 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
 		 * Limit coherent and dma mask based on size
 		 * retrieved from firmware.
 		 */
+		dev->bus_dma_mask = mask;
 		dev->coherent_dma_mask = mask;
 		*dev->dma_mask = mask;
 	}
-- 
2.17.1.dirty