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authorMans Rullgard <mans@mansr.com>2016-03-18 17:24:45 +0300
committerVinod Koul <vinod.koul@intel.com>2016-04-13 19:06:10 +0300
commita3e557999be74810e02be1d0c107096b7aa48ece (patch)
tree59704e5a77a784f3b8f6e61c9d376d78f649d32a /drivers/dma/dw
parent2a0fae025e56afbe38441d411f57667b08f44d0e (diff)
downloadlinux-a3e557999be74810e02be1d0c107096b7aa48ece.tar.xz
dmaengine: dw: clear LLP_[SD]_EN bits in last descriptor of a chain
The datasheet requires that the LLP_[SD]_EN bits be cleared whenever LLP.LOC is zero, i.e. in the last descriptor of a multi-block chain. Make the driver do this. Signed-off-by: Mans Rullgard <mans@mansr.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/dw')
-rw-r--r--drivers/dma/dw/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 23bb460fff6a..db9b6f433148 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -759,6 +759,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
lli_set(prev, ctllo, DWC_CTLL_INT_EN);
prev->lli.llp = 0;
+ lli_clear(prev, ctllo, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->txd.flags = flags;
first->total_len = len;
@@ -919,6 +920,7 @@ slave_sg_fromdev_fill_desc:
lli_set(prev, ctllo, DWC_CTLL_INT_EN);
prev->lli.llp = 0;
+ lli_clear(prev, ctllo, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->total_len = total_len;
return &first->txd;