dmaengine: at_xdmac: change block increment addressing mode

The addressing mode we were using was not only incrementing the address at each microblock, but also at each data boundary, which was severely slowing the transfer, without any benefit since we were not using the data stride. Switch to the micro block increment only in order to get back to an acceptable performance level. Signed-off-by: Maxime Ripard <[email protected]> Signed-off-by: Ludovic Desroches <[email protected]> Fixes: 6007ccb ("dmaengine: xdmac: Add interleaved transfer support") Cc: [email protected] openbmc#4.2 Signed-off-by: Vinod Koul <[email protected]>
nkskjames · Jan 13, 2016 · d98f6cb · d98f6cb
1 parent e608fef
commit d98f6cb
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
@@ -875,14 +875,14 @@ at_xdmac_interleaved_queue_desc(struct dma_chan *chan,
 
 	if (xt->src_inc) {
 		if (xt->src_sgl)
-			chan_cc |=  AT_XDMAC_CC_SAM_UBS_DS_AM;
+			chan_cc |=  AT_XDMAC_CC_SAM_UBS_AM;
 		else
 			chan_cc |=  AT_XDMAC_CC_SAM_INCREMENTED_AM;
 	}
 
 	if (xt->dst_inc) {
 		if (xt->dst_sgl)
-			chan_cc |=  AT_XDMAC_CC_DAM_UBS_DS_AM;
+			chan_cc |=  AT_XDMAC_CC_DAM_UBS_AM;
 		else
 			chan_cc |=  AT_XDMAC_CC_DAM_INCREMENTED_AM;
 	}