forcedeth: add clock gating feature <resend>
This patch adds new logic to support a clock gating feature found on the latest set of chipsets. The clock gating is performed on the tx/rx engines when the link is disconnected. Clock gating helps in reducing power consumption. * modified based on comments from netdev Signed-off-by: NAyaz Abdulla <aabdulla@nvidia.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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