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net/designware: Make DMA burst length configurable and reduce by default

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The correct value for this setting can vary across SoCs and boards, so make it
configurable.

Also reduce the default value to 8, which is the same default as used in the
Linux driver.

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Ian Campbell
2014-05-08 22:26:35 +01:00
committed by Albert ARIBAUD
parent 1857075a7f
commit 49692c5f51
2 changed files with 7 additions and 7 deletions
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2
drivers/net/designware.c
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@@ -249,7 +249,7 @@ static int dw_eth_init(struct eth_device *dev, bd_t *bis)
rx_descs_init(dev);
tx_descs_init(dev);
writel(FIXEDBURST | PRIORXTX_41 | BURST_16, &dma_p->busmode);
writel(FIXEDBURST | PRIORXTX_41 | DMA_PBL, &dma_p->busmode);
writel(readl(&dma_p->opmode) | FLUSHTXFIFO | STOREFORWARD,
&dma_p->opmode);