net: ethernet: ti: am65-cpsw: Move mode specific config to mac_config()

Move the interface mode specific configuration to the mac_config()
callback am65_cpsw_nuss_mac_config().

Also, do not reset the MAC Control register on mac_link_down(). Only
clear those bits that can possibly be set in mac_link_up().

Let the MAC remain in IDLE state after mac_link_down(). Bring it out of
the IDLE state on mac_link_up().

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 035dc03..f08f0e7 100644 (file)
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1506,9 +1506,13 @@ static void am65_cpsw_nuss_mac_config(struct phylink_config *config, unsigned in
        struct am65_cpsw_common *common = port->common;
 
        if (common->pdata.extra_modes & BIT(state->interface)) {
-               if (state->interface == PHY_INTERFACE_MODE_SGMII)
+               if (state->interface == PHY_INTERFACE_MODE_SGMII) {
                        writel(ADVERTISE_SGMII,
                               port->sgmii_base + AM65_CPSW_SGMII_MR_ADV_ABILITY_REG);
+                       cpsw_sl_ctl_set(port->slave.mac_sl, CPSW_SL_CTL_EXT_EN);
+               } else {
+                       cpsw_sl_ctl_clr(port->slave.mac_sl, CPSW_SL_CTL_EXT_EN);
+               }
 
                writel(AM65_CPSW_SGMII_CONTROL_MR_AN_ENABLE,
                       port->sgmii_base + AM65_CPSW_SGMII_CONTROL_REG);
@@ -1523,6 +1527,7 @@ static void am65_cpsw_nuss_mac_link_down(struct phylink_config *config, unsigned
        struct am65_cpsw_port *port = container_of(slave, struct am65_cpsw_port, slave);
        struct am65_cpsw_common *common = port->common;
        struct net_device *ndev = port->ndev;
+       u32 mac_control;
        int tmo;
 
        /* disable forwarding */
@@ -1534,7 +1539,14 @@ static void am65_cpsw_nuss_mac_link_down(struct phylink_config *config, unsigned
        dev_dbg(common->dev, "down msc_sl %08x tmo %d\n",
                cpsw_sl_reg_read(port->slave.mac_sl, CPSW_SL_MACSTATUS), tmo);
 
-       cpsw_sl_ctl_reset(port->slave.mac_sl);
+       /* All the bits that am65_cpsw_nuss_mac_link_up() can possibly set */
+       mac_control = CPSW_SL_CTL_GMII_EN | CPSW_SL_CTL_GIG | CPSW_SL_CTL_IFCTL_A |
+                     CPSW_SL_CTL_FULLDUPLEX | CPSW_SL_CTL_RX_FLOW_EN | CPSW_SL_CTL_TX_FLOW_EN;
+       /* If interface mode is RGMII, CPSW_SL_CTL_EXT_EN might have been set for 10 Mbps */
+       if (phy_interface_mode_is_rgmii(interface))
+               mac_control |= CPSW_SL_CTL_EXT_EN;
+       /* Only clear those bits that can be set by am65_cpsw_nuss_mac_link_up() */
+       cpsw_sl_ctl_clr(port->slave.mac_sl, mac_control);
 
        am65_cpsw_qos_link_down(ndev);
        netif_tx_stop_all_queues(ndev);
@@ -1551,10 +1563,12 @@ static void am65_cpsw_nuss_mac_link_up(struct phylink_config *config, struct phy
        u32 mac_control = CPSW_SL_CTL_GMII_EN;
        struct net_device *ndev = port->ndev;
 
+       /* Bring the port out of idle state */
+       cpsw_sl_ctl_clr(port->slave.mac_sl, CPSW_SL_CTL_CMD_IDLE);
+
        if (speed == SPEED_1000)
                mac_control |= CPSW_SL_CTL_GIG;
-       if (interface == PHY_INTERFACE_MODE_SGMII)
-               mac_control |= CPSW_SL_CTL_EXT_EN;
+       /* TODO: Verify whether in-band is necessary for 10 Mbps RGMII */
        if (speed == SPEED_10 && phy_interface_mode_is_rgmii(interface))
                /* Can be used with in band mode only */
                mac_control |= CPSW_SL_CTL_EXT_EN;