net: macb: Clean 64b dma addresses if they are not detected
authorMichal Simek <michal.simek@xilinx.com>
Tue, 25 Sep 2018 06:32:50 +0000 (08:32 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 25 Sep 2018 17:33:52 +0000 (10:33 -0700)
commite1e5d8a9fe737d94ccc0ccbaf0c97f69a8f3e000
tree9aa3084ee9ff86f6216dacc305f974811949ef2f
parent846e8dd47c264e0b359afed28ea88e0acdee6818
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>
drivers/net/ethernet/cadence/macb_main.c