linux-kernel - [PATCH RFC 23/51] DMA-API: dma: pl08x: add dma_set_mask_and

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Message-Id: <E1V50rs-0006rf-UM@rmk-PC.arm.linux.org.uk>
Date:	Thu, 01 Aug 2013 22:57:08 +0100
From:	Russell King <rmk+kernel@....linux.org.uk>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH RFC 23/51] DMA-API: dma: pl08x: add
 dma_set_mask_and_coherent() call

The DMA API requires drivers to call the appropriate dma_set_mask()
functions before doing any DMA mapping.  Add this required call to
the AMBA PL08x driver.

Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
---
 drivers/dma/amba-pl08x.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 06fe45c..c23f876 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -1853,6 +1853,11 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
 	if (ret)
 		return ret;
 
+	/* Ensure that we can do DMA */
+	ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32));
+	if (ret)
+		goto out_no_pl08x;
+
 	/* Create the driver state holder */
 	pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL);
 	if (!pl08x) {
-- 
1.7.4.4

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