From: Maxime Ripard Date: Tue, 15 Sep 2015 13:36:00 +0000 (+0200) Subject: dmaengine: at_xdmac: change block increment addressing mode X-Git-Tag: v4.14-rc1~4593^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a1cf09031e641d3cceaca4a4dd20ef6a785bc9b3;p=platform%2Fkernel%2Flinux-rpi.git 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 Signed-off-by: Ludovic Desroches Fixes: 6007ccb57744 ("dmaengine: xdmac: Add interleaved transfer support") Cc: stable@vger.kernel.org #4.2 Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index a165b4b..ffea602 100644 --- 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; }