net: phy: mscc: enable VSC8501/2 RGMII RX clock

By default the VSC8501 and VSC8502 RGMII/GMII/MII RX_CLK output is
disabled. To allow packet forwarding towards the MAC it needs to be
enabled.

For other PHYs supported by this driver the clock output is enabled
by default.

Fixes: d3169863310d ("net: phy: mscc: add support for VSC8502")
Signed-off-by: David Epping <david.epping@missinglinkelectronics.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
index 79cbb24186640c3b6b3a02f47f4f3c3163086649..defe5cc6d4fcef4754edfb0aa5a1d6e562e0b282 100644 (file)
--- a/drivers/net/phy/mscc/mscc.h
+++ b/drivers/net/phy/mscc/mscc.h
@@ -179,6 +179,7 @@ enum rgmii_clock_delay {
 #define VSC8502_RGMII_CNTL               20
 #define VSC8502_RGMII_RX_DELAY_MASK      0x0070
 #define VSC8502_RGMII_TX_DELAY_MASK      0x0007
+#define VSC8502_RGMII_RX_CLK_DISABLE     0x0800
 
 #define MSCC_PHY_WOL_LOWER_MAC_ADDR      21
 #define MSCC_PHY_WOL_MID_MAC_ADDR        22

diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
index 0c39b3ecb1f2a19027aebfd4069242b28d36f852..28df8a2e4230f3ffd6f559e8ac9521cedc7d0100 100644 (file)
--- a/drivers/net/phy/mscc/mscc_main.c
+++ b/drivers/net/phy/mscc/mscc_main.c
@@ -519,14 +519,27 @@ static int vsc85xx_mac_if_set(struct phy_device *phydev,
  *  * 2.0 ns (which causes the data to be sampled at exactly half way between
  *    clock transitions at 1000 Mbps) if delays should be enabled
  */
-static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
-                                  u16 rgmii_rx_delay_mask,
-                                  u16 rgmii_tx_delay_mask)
+static int vsc85xx_update_rgmii_cntl(struct phy_device *phydev, u32 rgmii_cntl,
+                                    u16 rgmii_rx_delay_mask,
+                                    u16 rgmii_tx_delay_mask)
 {
        u16 rgmii_rx_delay_pos = ffs(rgmii_rx_delay_mask) - 1;
        u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1;
        u16 reg_val = 0;
-       int rc;
+       u16 mask = 0;
+       int rc = 0;
+
+       /* For traffic to pass, the VSC8502 family needs the RX_CLK disable bit
+        * to be unset for all PHY modes, so do that as part of the paged
+        * register modification.
+        * For some family members (like VSC8530/31/40/41) this bit is reserved
+        * and read-only, and the RX clock is enabled by default.
+        */
+       if (rgmii_cntl == VSC8502_RGMII_CNTL)
+               mask |= VSC8502_RGMII_RX_CLK_DISABLE;
+
+       if (phy_interface_is_rgmii(phydev))
+               mask |= rgmii_rx_delay_mask | rgmii_tx_delay_mask;
 
        if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
            phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
@@ -535,29 +548,20 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
            phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
                reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_tx_delay_pos;
 
-       rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
-                             rgmii_cntl,
-                             rgmii_rx_delay_mask | rgmii_tx_delay_mask,
-                             reg_val);
+       if (mask)
+               rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
+                                     rgmii_cntl, mask, reg_val);
 
        return rc;
 }
 
 static int vsc85xx_default_config(struct phy_device *phydev)
 {
-       int rc;
-
        phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
 
-       if (phy_interface_mode_is_rgmii(phydev->interface)) {
-               rc = vsc85xx_rgmii_set_skews(phydev, VSC8502_RGMII_CNTL,
-                                            VSC8502_RGMII_RX_DELAY_MASK,
-                                            VSC8502_RGMII_TX_DELAY_MASK);
-               if (rc)
-                       return rc;
-       }
-
-       return 0;
+       return vsc85xx_update_rgmii_cntl(phydev, VSC8502_RGMII_CNTL,
+                                        VSC8502_RGMII_RX_DELAY_MASK,
+                                        VSC8502_RGMII_TX_DELAY_MASK);
 }
 
 static int vsc85xx_get_tunable(struct phy_device *phydev,
@@ -1754,13 +1758,11 @@ static int vsc8584_config_init(struct phy_device *phydev)
        if (ret)
                return ret;
 
-       if (phy_interface_is_rgmii(phydev)) {
-               ret = vsc85xx_rgmii_set_skews(phydev, VSC8572_RGMII_CNTL,
-                                             VSC8572_RGMII_RX_DELAY_MASK,
-                                             VSC8572_RGMII_TX_DELAY_MASK);
-               if (ret)
-                       return ret;
-       }
+       ret = vsc85xx_update_rgmii_cntl(phydev, VSC8572_RGMII_CNTL,
+                                       VSC8572_RGMII_RX_DELAY_MASK,
+                                       VSC8572_RGMII_TX_DELAY_MASK);
+       if (ret)
+               return ret;
 
        ret = genphy_soft_reset(phydev);
        if (ret)