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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2020-07-23 03:58:46 +0300
committerVinod Koul <vkoul@kernel.org>2020-07-27 14:30:55 +0530
commit585d35451e94b2e1b0bf59ef55d3b4a1c8ab3d77 (patch)
tree930cedb9ff20c5a2edc286c0dab36197aa05a9c4 /drivers/dma
parente6fe5767961dbdcabbdfcc570993a91eebca4586 (diff)
dmaengine: dw: Initialize min and max burst DMA device capability
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. The maximum burst transaction can vary from channel to channel and from controller to controller depending on a IP-core parameter the system engineer activated during the IP-core synthesis. Let's initialise both min_burst and max_burst members of the DMA controller descriptor with extreme values so the DMA clients could use them to properly optimize the DMA requests. The channels and controller-specific max_burst length initialization will be introduced by the follow-up patches. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200723005848.31907-9-Sergey.Semin@baikalelectronics.ru Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dw/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index fb95920c429e..afe5a2e465af 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1223,6 +1223,8 @@ int do_dma_probe(struct dw_dma_chip *chip)
dw->dma.device_issue_pending = dwc_issue_pending;
/* DMA capabilities */
+ dw->dma.min_burst = DW_DMA_MIN_BURST;
+ dw->dma.max_burst = DW_DMA_MAX_BURST;
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) |