gianfar: Fix potential soft reset race
SOFT_RESET must be asserted for at least 3 TX clocks in order for it to work properly. The syncs in the gfar_write() commands have been hiding this, but we need to guarantee it. Signed-off-by: Andy Fleming <afleming@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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