dmaengine: at_xdmac: fix at_xdmac_prep_dma_memcpy()
authorCyrille Pitchen <cyrille.pitchen@atmel.com>
Mon, 7 Dec 2015 14:58:56 +0000 (15:58 +0100)
committerVinod Koul <vinod.koul@intel.com>
Thu, 10 Dec 2015 04:18:01 +0000 (09:48 +0530)
This patch fixes at_xdmac_prep_dma_memcpy(). Indeed the data width field
of the Channel Configuration register was not updated properly in the
loop: the bits of the dwidth field were not cleared before adding their
new value.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: e1f7c9eee70 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver")
Cc: stable@vger.kernel.org #4.1 and later
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
drivers/dma/at_xdmac.c

index bda4951..370c661 100644 (file)
@@ -1088,6 +1088,7 @@ at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
                /* Check remaining length and change data width if needed. */
                dwidth = at_xdmac_align_width(chan,
                                              src_addr | dst_addr | xfer_size);
+               chan_cc &= ~AT_XDMAC_CC_DWIDTH_MASK;
                chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth);
 
                ublen = xfer_size >> dwidth;