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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2015-10-16 09:17:59 +0200
committerVinod Koul <vinod.koul@intel.com>2015-10-27 02:22:44 +0100
commit21a31846a7736a88709fe6fe2e73857d884de89c (patch)
treefba243e25bf8d4aad2d2342b2b5c1e7c51b3319f /drivers/dma/edma.c
parentdmaengine: edma: Dynamic paRAM slot handling if HW supports it (diff)
downloadlinux-21a31846a7736a88709fe6fe2e73857d884de89c.tar.xz
linux-21a31846a7736a88709fe6fe2e73857d884de89c.zip
dmaengine: edma: Remove alignment constraint for memcpy
Despite the claim by the original commit adding the memcpy support, eDMA does not have constraint on the alignment of src, dst or length in increment mode. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/edma.c')
-rw-r--r--drivers/dma/edma.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 7eefbf1e1c94..b36dfa5458cb 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -1324,6 +1324,7 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
struct edma_desc *edesc;
struct device *dev = chan->device->dev;
struct edma_chan *echan = to_edma_chan(chan);
+ unsigned int width;
if (unlikely(!echan || !len))
return NULL;
@@ -1336,8 +1337,12 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
edesc->pset_nr = 1;
+ width = 1 << __ffs((src | dest | len));
+ if (width > DMA_SLAVE_BUSWIDTH_64_BYTES)
+ width = DMA_SLAVE_BUSWIDTH_64_BYTES;
+
ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
- DMA_SLAVE_BUSWIDTH_4_BYTES, len, DMA_MEM_TO_MEM);
+ width, len, DMA_MEM_TO_MEM);
if (ret < 0)
return NULL;
@@ -1903,12 +1908,6 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma,
dma->dev = dev;
- /*
- * code using dma memcpy must make sure alignment of
- * length is at dma->copy_align boundary.
- */
- dma->copy_align = DMAENGINE_ALIGN_4_BYTES;
-
INIT_LIST_HEAD(&dma->channels);
}