linux-kernel - [PATCH v3 2/2] dma/imx-sdma: use writel to write register when enable a channel

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Message-ID: <1325750362-22598-3-git-send-email-richard.zhao@linaro.org>
Date:	Thu, 5 Jan 2012 15:59:22 +0800
From:	Richard Zhao <richard.zhao@...aro.org>
To:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	<dan.j.williams@...el.com>, <vinod.koul@...el.com>,
	<shawn.guo@...aro.org>, <kernel@...gutronix.de>,
	<eric.miao@...aro.org>, <patches@...aro.org>,
	Richard Zhao <richard.zhao@...aro.org>
Subject: [PATCH v3 2/2] dma/imx-sdma: use writel to write register when enable a channel

dma_alloc_coherent memory may be bufferable when set
CONFIG_ARM_DMA_MEM_BUFFERABLE. We need to add nececcary
memory barrier. writel implicitly call wmb in such case.

Signed-off-by: Richard Zhao <richard.zhao@...aro.org>
---
 drivers/dma/imx-sdma.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index c2bc4f1..e987468 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -396,7 +396,7 @@ static int sdma_config_ownership(struct sdma_channel *sdmac,
 
 static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
 {
-	__raw_writel(1 << channel, sdma->regs + SDMA_H_START);
+	writel(1 << channel, sdma->regs + SDMA_H_START);
 }
 
 /*
-- 
1.7.5.4


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