netdev - [PATCH v2 net-next 4/6] net: dsa: felix: set proper pause frame timers based on link speed

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Date:   Sat,  4 Jul 2020 15:45:05 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        claudiu.manoil@....com, alexandru.marginean@....com,
        ioana.ciornei@....com, linux@...linux.org.uk
Subject: [PATCH v2 net-next 4/6] net: dsa: felix: set proper pause frame timers based on link speed

From: Vladimir Oltean <vladimir.oltean@....com>

state->speed holds a value of 10, 100, 1000 or 2500, but
SYS_MAC_FC_CFG_FC_LINK_SPEED expects a value in the range 0, 1, 2 or 3.

So set the correct speed encoding into this register.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v2:
None.

Note: this patch is still using state->speed from mac_config(), although
that will be changed in 6/6.

 drivers/net/dsa/ocelot/felix.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 4d819cc45bed..4684339012c5 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -250,10 +250,25 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
 			   DEV_CLOCK_CFG_LINK_SPEED(OCELOT_SPEED_1000),
 			   DEV_CLOCK_CFG);
 
-	/* Flow control. Link speed is only used here to evaluate the time
-	 * specification in incoming pause frames.
-	 */
-	mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(state->speed);
+	switch (state->speed) {
+	case SPEED_10:
+		mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(3);
+		break;
+	case SPEED_100:
+		mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(2);
+		break;
+	case SPEED_1000:
+	case SPEED_2500:
+		mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(1);
+		break;
+	case SPEED_UNKNOWN:
+		mac_fc_cfg = SYS_MAC_FC_CFG_FC_LINK_SPEED(0);
+		break;
+	default:
+		dev_err(ocelot->dev, "Unsupported speed on port %d: %d\n",
+			port, state->speed);
+		return;
+	}
 
 	/* handle Rx pause in all cases, with 2500base-X this is used for rate
 	 * adaptation.
@@ -265,6 +280,10 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
 			      SYS_MAC_FC_CFG_PAUSE_VAL_CFG(0xffff) |
 			      SYS_MAC_FC_CFG_FC_LATENCY_CFG(0x7) |
 			      SYS_MAC_FC_CFG_ZERO_PAUSE_ENA;
+
+	/* Flow control. Link speed is only used here to evaluate the time
+	 * specification in incoming pause frames.
+	 */
 	ocelot_write_rix(ocelot, mac_fc_cfg, SYS_MAC_FC_CFG, port);
 
 	ocelot_write_rix(ocelot, 0, ANA_POL_FLOWC, port);
-- 
2.25.1