sfc: Add support for SFN4111T

Add support code for the SFN4111T 100/1000/10GBASE-T reference design,
based in part on the existing code for the SFE4001.

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

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/net/sfc/selftest.c b/drivers/net/sfc/selftest.c
index 578b7f410ed4..6bb09f263b33 100644
--- a/drivers/net/sfc/selftest.c
+++ b/drivers/net/sfc/selftest.c
@@ -702,8 +702,15 @@ int efx_offline_test(struct efx_nic *efx,
          */
         mutex_lock(&efx->mac_lock);
         efx->port_inhibited = true;
-        if (efx->loopback_modes)
-                efx->loopback_mode = __ffs(efx->loopback_modes);
+        if (efx->loopback_modes) {
+                /* We need the 312 clock from the PHY to test the XMAC
+                 * registers, so move into XGMII loopback if available */
+                if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
+                        efx->loopback_mode = LOOPBACK_XGMII;
+                else
+                        efx->loopback_mode = __ffs(efx->loopback_modes);
+        }
+
         __efx_reconfigure_port(efx);
         mutex_unlock(&efx->mac_lock);