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authorIra Snyder <iws@ovro.caltech.edu>2009-05-28 09:26:40 +0000
committerDan Williams <dan.j.williams@intel.com>2009-06-16 11:43:40 -0700
commit43a1a3ed6bf5a1b9ae197b4f5f20033baf19db61 (patch)
treee14df96fd17ae32d4d3b77d881de7080947e7fb2
parentbe30b226f2ae618cd719e40267d9923db1db9001 (diff)
fsldma: do not clear bandwidth control bits on the 83xx controller
The 83xx controller does not support the external pause feature. The bit in the mode register that controls external pause on the 85xx controller happens to be part of the bandwidth control settings for the 83xx controller. This patch fixes the driver so that it only clears the external pause bit if the hardware is the 85xx controller. When driving the 83xx controller, the bit is left untouched. This follows the existing convention that mode registers settings are not touched unless necessary. Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
-rw-r--r--drivers/dma/fsldma.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 10bcf0cb0ef..6e60c77a145 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -147,10 +147,11 @@ static void dma_start(struct fsl_dma_chan *fsl_chan)
if (fsl_chan->feature & FSL_DMA_CHAN_PAUSE_EXT) {
DMA_OUT(fsl_chan, &fsl_chan->reg_base->bcr, 0, 32);
mr_set |= FSL_DMA_MR_EMP_EN;
- } else
+ } else if ((fsl_chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) {
DMA_OUT(fsl_chan, &fsl_chan->reg_base->mr,
DMA_IN(fsl_chan, &fsl_chan->reg_base->mr, 32)
& ~FSL_DMA_MR_EMP_EN, 32);
+ }
if (fsl_chan->feature & FSL_DMA_CHAN_START_EXT)
mr_set |= FSL_DMA_MR_EMS_EN;