linux-kernel - [PATCH 2/2] dma/imx-sdma: move clk_enable out of sdma_request

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Date:	Mon, 9 Jan 2012 16:49:00 +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 2/2] dma/imx-sdma: move clk_enable out of sdma_request_channel

It makes clk_enable/disable pair more readable, and fix one bug:
sdma_init calls sdma_request_channel, but seems don't know
sdma_request_channel enabled the clok.

Signed-off-by: Richard Zhao <richard.zhao@...aro.org>
---
 drivers/dma/imx-sdma.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 6376009..2a0e02d 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -802,8 +802,6 @@ static int sdma_request_channel(struct sdma_channel *sdmac)
 	sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys;
 	sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
 
-	clk_enable(sdma->clk);
-
 	sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY);
 
 	init_completion(&sdmac->done);
@@ -875,6 +873,9 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
 
 	sdmac->peripheral_type = data->peripheral_type;
 	sdmac->event_id0 = data->dma_request;
+
+	clk_enable(sdmac->sdma->clk);
+
 	ret = sdma_request_channel(sdmac);
 	if (ret)
 		return ret;
-- 
1.7.5.4


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