sfc: Clear RXIN_SEL when soft-resetting QT2025C

When we enable PMA/PMD loopback this automatically sets RXIN_SEL
(inverse polarity for RXIN).  We need to clear that bit during the
soft-reset sequence, as it is not done automatically.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/sfc/qt202x_phy.c b/drivers/net/sfc/qt202x_phy.c
index 68813d1d85f3..ea3ae0089315 100644
--- a/drivers/net/sfc/qt202x_phy.c
+++ b/drivers/net/sfc/qt202x_phy.c
@@ -41,6 +41,8 @@
 #define PCS_UC_STATUS_LBN       0
 #define PCS_UC_STATUS_WIDTH     8
 #define PCS_UC_STATUS_FW_SAVE   0x20
+#define PMA_PMD_MODE_REG        0xc301
+#define PMA_PMD_RXIN_SEL_LBN    6
 #define PMA_PMD_FTX_CTRL2_REG   0xc309
 #define PMA_PMD_FTX_STATIC_LBN  13
 #define PMA_PMD_VEND1_REG       0xc001
@@ -282,6 +284,10 @@ static int qt2025c_select_phy_mode(struct efx_nic *efx)
          * slow) reload of the firmware image (the microcontroller's code
          * memory is not affected by the microcontroller reset). */
         efx_mdio_write(efx, 1, 0xc317, 0x00ff);
+        /* PMA/PMD loopback sets RXIN to inverse polarity and the firmware
+         * restart doesn't reset it. We need to do that ourselves. */
+        efx_mdio_set_flag(efx, 1, PMA_PMD_MODE_REG,
+                          1 << PMA_PMD_RXIN_SEL_LBN, false);
         efx_mdio_write(efx, 1, 0xc300, 0x0002);
         msleep(20);