net: phy: aquantia: wait for the GLOBAL_CFG to start returning real values

When the PHY is first coming up (or resuming from suspend), it's
possible that although the FW status shows as running, we still see
zeroes in the GLOBAL_CFG set of registers and cannot determine available
modes. Since all models support 10M, add a poll and wait the config to
become available.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index 974795bd0860abf8385f2ae1f6dc01210681c95c..2c8ba2725a919b66288c1ef1970275d69b36cbcd 100644 (file)
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -652,7 +652,13 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
        unsigned long *possible = phydev->possible_interfaces;
        unsigned int serdes_mode, rate_adapt;
        phy_interface_t interface;
-       int i, val;
+       int i, val, ret;
+
+       ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
+                                       VEND1_GLOBAL_CFG_10M, val, val != 0,
+                                       1000, 100000, false);
+       if (ret)
+               return ret;
 
        /* Walk the media-speed configuration registers to determine which
         * host-side serdes modes may be used by the PHY depending on the