提交 a3e55799 编写于 作者: M Mans Rullgard 提交者: Vinod Koul

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: NMans Rullgard <mans@mansr.com>
Acked-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>
上级 2a0fae02
......@@ -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 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
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;
......
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