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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>
This commit is contained in:
Mans Rullgard 2016-03-18 16:24:45 +02:00 committed by Vinod Koul
parent 2a0fae025e
commit a3e557999b
1 changed files with 2 additions and 0 deletions
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2
drivers/dma/dw/core.c
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@ -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;