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dmaengine: at_xdmac: fix bad behavior in interleaved mode 

When performing interleaved transfers with numf > 1, an extra line is
copied. The mbr.bc field is incremented once too often. The length of
the block is (BLEN+1) microblocks.

Signed-off-by: Sylvain ETIENNE <Sylvain.ETIENNE@ingenico.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: 4e5385784e ("dmaengine: at_xdmac: handle numf > 1")
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
hifive-unleashed-5.1
Sylvain ETIENNE 2015-12-02 17:10:16 +01:00 committed by Vinod Koul
parent f5a00eb719
commit ef10b0b241
1 changed files with 3 additions and 1 deletions
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4
drivers/dma/at_xdmac.c
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@ -965,7 +965,9 @@ at_xdmac_prep_interleaved(struct dma_chan *chan,
NULL,
src_addr, dst_addr,
xt, xt->sgl);
for (i = 0; i < xt->numf; i++)
/* Length of the block is (BLEN+1) microblocks. */
for (i = 0; i < xt->numf - 1; i++)
at_xdmac_increment_block_count(chan, first);
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",