According to the DW APB DMAC data book the minimum burst transaction
length is 1 and it's true for any version of the controller since
isn't parametrised in the coreAssembler so can't be changed at the
IP-core synthesis stage. Let's initialise the min_burst member of the
DMA controller descriptor so the DMA clients could use it to properly
optimize the DMA requests.
Signed-off-by: Serge Semin <sergey.se...@baikalelectronics.ru>
Cc: Alexey Malahov <alexey.mala...@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbog...@alpha.franken.de>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Rob Herring <robh...@kernel.org>
Cc: linux-m...@vger.kernel.org
Cc: devicet...@vger.kernel.org
---
Changelog v4:
- This is a new patch suggested by Andy.
---
drivers/dma/dw/core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index ceded21537e2..a8cebb1dbb68 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1229,6 +1229,7 @@ int do_dma_probe(struct dw_dma_chip *chip)
dw->dma.device_issue_pending = dwc_issue_pending;
/* DMA capabilities */
+ dw->dma.min_burst = 1;
dw->dma.src_addr_widths = DW_DMA_BUSWIDTHS;
dw->dma.dst_addr_widths = DW_DMA_BUSWIDTHS;
dw->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
--
2.26.2
