stmmac: Enable unicast pause frame detect in GMAC Register 6

Unicast pause frame detect was not being enabled for the Synopsys stmmac. This
patch sets Unicast pause frame detect in MAC register 6 so that pause frame
detection by the stmmac conforms to IEEE 802.3, Annex 31B.3.3 Receive
Operation - Specifically, a MAC shall respond to pause frames containing
either the reserved multicast address or the unique physical address
associated with this station.

Signed-off-by: Vince Bridgers <vbridger@opensource.altera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
index 0adcf73..371a669 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c
@@ -201,7 +201,10 @@ static void dwmac1000_flow_ctrl(struct mac_device_info *hw, unsigned int duplex,
                                unsigned int fc, unsigned int pause_time)
 {
        void __iomem *ioaddr = hw->pcsr;
-       unsigned int flow = 0;
+       /* Set flow such that DZPQ in Mac Register 6 is 0,
+        * and unicast pause detect is enabled.
+        */
+       unsigned int flow = GMAC_FLOW_CTRL_UP;
 
        pr_debug("GMAC Flow-Control:\n");
        if (fc & FLOW_RX) {