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net: macb: Clean 64b dma addresses if they are not detected 

Clear ADDR64 dma bit in DMACFG register in case that HW_DMA_CAP_64B is
not detected on 64bit system.
The issue was observed when bootloader(u-boot) does not check macb
feature at DCFG6 register (DAW64_OFFSET) and enabling 64bit dma support
by default. Then macb driver is reading DMACFG register back and only
adding 64bit dma configuration but not cleaning it out.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Simek 2018-09-25 08:32:50 +02:00 committed by David S. Miller
parent 9da90297ca
commit bd6207202d
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/cadence/macb_main.c
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@ -2159,6 +2159,7 @@ static void macb_configure_dma(struct macb *bp)
else
dmacfg &= ~GEM_BIT(TXCOEN);
dmacfg &= ~GEM_BIT(ADDR64);
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
if (bp->hw_dma_cap & HW_DMA_CAP_64B)
dmacfg |= GEM_BIT(ADDR64);