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dmaengine: fsldma: set BWC, DAHTS and SAHTS values correctly

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The bits of BWC, DAHTS and SAHTS in the DMA mode register must be cleared
before a new value can be or-ed in.

Signed-off-by: Thomas Breitung <thomas.breitung@izt-labs.de>
Signed-off-by: Wolfgang Ocker <weo@reccoware.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Thomas Breitung 2017-06-19 16:40:04 +02:00 • committed by Vinod Koul
parent 036e9ef8be
commit ccc0772927
2 changed files with 8 additions and 1 deletions
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5
drivers/dma/fsldma.c
View file

@ -269,6 +269,7 @@ static void fsl_chan_set_src_loop_size(struct fsldma_chan *chan, int size)
case 2:
case 4:
case 8:
mode &= ~FSL_DMA_MR_SAHTS_MASK;
mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14);
break;
}
@ -301,6 +302,7 @@ static void fsl_chan_set_dst_loop_size(struct fsldma_chan *chan, int size)
case 2:
case 4:
case 8:
mode &= ~FSL_DMA_MR_DAHTS_MASK;
mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16);
break;
}
@ -327,7 +329,8 @@ static void fsl_chan_set_request_count(struct fsldma_chan *chan, int size)
BUG_ON(size > 1024);
mode = get_mr(chan);
mode |= (__ilog2(size) << 24) & 0x0f000000;
mode &= ~FSL_DMA_MR_BWC_MASK;
mode |= (__ilog2(size) << 24) & FSL_DMA_MR_BWC_MASK;
set_mr(chan, mode);
}

4
drivers/dma/fsldma.h
View file

@ -36,6 +36,10 @@
#define FSL_DMA_MR_DAHE 0x00002000
#define FSL_DMA_MR_SAHE 0x00001000
#define FSL_DMA_MR_SAHTS_MASK 0x0000C000
#define FSL_DMA_MR_DAHTS_MASK 0x00030000
#define FSL_DMA_MR_BWC_MASK 0x0f000000
/*
* Bandwidth/pause control determines how many bytes a given
* channel is allowed to transfer before the DMA engine pauses