linux-kernel - [PATCH 2/3] spi: spi-xilinx: Clear dma

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Message-Id: <c5f546072e530c42e7ca15745ffa16729d72a5ac.1370354549.git.michal.simek@xilinx.com>
Date:	Tue,  4 Jun 2013 16:02:35 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	linux-kernel@...r.kernel.org
Cc:	Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>,
	Peter Crosthwaite <pcrost@...inx.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	spi-devel-general@...ts.sourceforge.net
Subject: [PATCH 2/3] spi: spi-xilinx: Clear dma_mask for xilinx spi controller

From: Michal Simek <monstr@...str.eu>

mmc_spi driver tests if dma is available
through spi->master->dev.parent->dma_mask.
Microblaze supports DMA but xilinx_spi IP doesn't.
That's why clear dma_mask in the driver.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
 drivers/spi/spi-xilinx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 34d18dc..d690756 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -365,6 +365,9 @@ struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
 	if (!master)
 		return NULL;

+	/* clear the dma_mask, to try to disable use of dma */
+	master->dev.dma_mask = 0;
+
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CPOL | SPI_CPHA;

--
1.8.2.3


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