From: Andy Shevchenko Date: Tue, 26 Jan 2016 11:43:13 +0000 (+0200) Subject: dmaengine: idma64: clear LLP_[SD]_EN bits in last descriptor X-Git-Tag: next-20160301~79^2~6^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a2826e662eb13a041078260692b4e023ed5cbf62;p=karo-tx-linux.git 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 Signed-off-by: Vinod Koul --- 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(