sfc: QT2025C: Work around PHY bug

If we see the PHY remaining stuck in a link-down state due to PCS being
down while PMA/PMD is up, we briefly switch to PMA/PMD loopback and back,
which usually unsticks it.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/sfc/qt202x_phy.c b/drivers/net/sfc/qt202x_phy.c
index 7450e3afbf4d2d4c27ab4626ceb8352470f3606a..e4590fb528a14869142493c8e3fd5644e9877a5f 100644 (file)
--- a/drivers/net/sfc/qt202x_phy.c
+++ b/drivers/net/sfc/qt202x_phy.c
@@ -52,11 +52,15 @@ void falcon_qt202x_set_led(struct efx_nic *p, int led, int mode)
 
 struct qt202x_phy_data {
        enum efx_phy_mode phy_mode;
+       bool bug17190_in_bad_state;
+       unsigned long bug17190_timer;
 };
 
 #define QT2022C2_MAX_RESET_TIME 500
 #define QT2022C2_RESET_WAIT 10
 
+#define BUG17190_INTERVAL (2 * HZ)
+
 static int qt2025c_wait_reset(struct efx_nic *efx)
 {
        unsigned long timeout = jiffies + 10 * HZ;
@@ -96,6 +100,39 @@ static int qt2025c_wait_reset(struct efx_nic *efx)
        return 0;
 }
 
+static void qt2025c_bug17190_workaround(struct efx_nic *efx)
+{
+       struct qt202x_phy_data *phy_data = efx->phy_data;
+
+       /* The PHY can get stuck in a state where it reports PHY_XS and PMA/PMD
+        * layers up, but PCS down (no block_lock).  If we notice this state
+        * persisting for a couple of seconds, we switch PMA/PMD loopback
+        * briefly on and then off again, which is normally sufficient to
+        * recover it.
+        */
+       if (efx->link_state.up ||
+           !efx_mdio_links_ok(efx, MDIO_DEVS_PMAPMD | MDIO_DEVS_PHYXS)) {
+               phy_data->bug17190_in_bad_state = false;
+               return;
+       }
+
+       if (!phy_data->bug17190_in_bad_state) {
+               phy_data->bug17190_in_bad_state = true;
+               phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL;
+               return;
+       }
+
+       if (time_after_eq(jiffies, phy_data->bug17190_timer)) {
+               EFX_LOG(efx, "bashing QT2025C PMA/PMD\n");
+               efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1,
+                                 MDIO_PMA_CTRL1_LOOPBACK, true);
+               msleep(100);
+               efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD, MDIO_CTRL1,
+                                 MDIO_PMA_CTRL1_LOOPBACK, false);
+               phy_data->bug17190_timer = jiffies + BUG17190_INTERVAL;
+       }
+}
+
 static int qt202x_reset_phy(struct efx_nic *efx)
 {
        int rc;
@@ -144,6 +181,8 @@ static int qt202x_phy_probe(struct efx_nic *efx)
                return -ENOMEM;
        efx->phy_data = phy_data;
        phy_data->phy_mode = efx->phy_mode;
+       phy_data->bug17190_in_bad_state = false;
+       phy_data->bug17190_timer = 0;
 
        efx->mdio.mmds = QT202X_REQUIRED_DEVS;
        efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
@@ -184,6 +223,9 @@ static bool qt202x_phy_poll(struct efx_nic *efx)
        efx->link_state.fd = true;
        efx->link_state.fc = efx->wanted_fc;
 
+       if (efx->phy_type == PHY_TYPE_QT2025C)
+               qt2025c_bug17190_workaround(efx);
+
        return efx->link_state.up != was_up;
 }