diff options
| author |   Maxime Ripard <maxime.ripard@free-electrons.com> | 2015-09-15 15:36:00 +0200 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2015-10-01 07:29:40 +0530 |
| commit | a1cf09031e641d3cceaca4a4dd20ef6a785bc9b3 (patch) | |
| tree | e62a9e42a2db4de85ce78ea624cbaeb6f9e3d3a3 /drivers/dma/at_xdmac.c | |
| parent | dmaengine: dw: properly read DWC_PARAMS register (diff) | |
| download | linux-dev-a1cf09031e641d3cceaca4a4dd20ef6a785bc9b3.tar.xz linux-dev-a1cf09031e641d3cceaca4a4dd20ef6a785bc9b3.zip | |
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 <maxime.ripard@free-electrons.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: 6007ccb57744 ("dmaengine: xdmac: Add interleaved transfer support")
Cc: stable@vger.kernel.org #4.2
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/at_xdmac.c')
| -rw-r--r-- | drivers/dma/at_xdmac.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index a165b4bfd330..ffea6027b631 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; } |