netdev - [PATCH net-next 3/4] net: mscc: ocelot: drop workaround for forcing RX flow control

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Date:   Tue,  1 Nov 2022 13:48:05 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Sean Anderson <sean.anderson@...o.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 3/4] net: mscc: ocelot: drop workaround for forcing RX flow control

As phylink gained generic support for PHYs with rate matching via PAUSE
frames, the phylink_mac_link_up() method will be called with the maximum
speed and with rx_pause=true if rate matching is in use. This means that
setups with 2500base-x as the SERDES protocol between the MAC/PCS and
the PHY now work with no need for the driver to do anything special.

Tested with fsl-ls1028a-qds-7777.dts.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 13b14110a060..da56f9bfeaf0 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -872,10 +872,8 @@ void ocelot_phylink_mac_link_up(struct ocelot *ocelot, int port,
 		return;
 	}
 
-	/* Handle RX pause in all cases, with 2500base-X this is used for rate
-	 * adaptation.
-	 */
-	mac_fc_cfg |= SYS_MAC_FC_CFG_RX_FC_ENA;
+	if (rx_pause)
+		mac_fc_cfg |= SYS_MAC_FC_CFG_RX_FC_ENA;
 
 	if (tx_pause)
 		mac_fc_cfg |= SYS_MAC_FC_CFG_TX_FC_ENA |
-- 
2.34.1