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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2016-01-26 14:43:13 +0300
committerVinod Koul <vinod.koul@intel.com>2016-02-15 19:36:45 +0300
commita2826e662eb13a041078260692b4e023ed5cbf62 (patch)
tree796ddeaa581305e4fe769a7d7a3e59525dd28981 /drivers/dma
parent92e963f50fc74041b5e9e744c330dca48e04f08d (diff)
downloadlinux-a2826e662eb13a041078260692b4e023ed5cbf62.tar.xz
dmaengine: idma64: clear LLP_[SD]_EN bits in last descriptor
The datasheet requires that the user must clear LLP_[SD]_EN bits whenever LLP.LOC is zero, i.e. in the last descriptor of a multi-block chain. Make the driver do this. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/idma64.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/dma/idma64.c b/drivers/dma/idma64.c
index 3cb7b2c78197..1953e57505f4 100644
--- a/drivers/dma/idma64.c
+++ b/drivers/dma/idma64.c
@@ -289,6 +289,9 @@ static void idma64_desc_fill(struct idma64_chan *idma64c,
/* Trigger an interrupt after the last block is transfered */
lli->ctllo |= IDMA64C_CTLL_INT_EN;
+
+ /* Disable LLP transfer in the last block */
+ lli->ctllo &= ~(IDMA64C_CTLL_LLP_S_EN | IDMA64C_CTLL_LLP_D_EN);
}
static struct dma_async_tx_descriptor *idma64_prep_slave_sg(