bnx2x: Enable FC when parallel-detect is used

When parallel detect is used, flow-control is set to the
req_fc_auto_adv instead of none.

Motive: when 577xx is FC configuration is set to AUTO, while LP speed
is set to FORCE mode and FC to force RX/TX, link would come up using
parallel detect, and the FC will be set to NONE since FC capabilities
were not negotiated, although the LP is setting FC to force RX/TX.

Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/net/bnx2x_link.c b/drivers/net/bnx2x_link.c
index bf1021ed5dd6..4c16a46f0caf 100644
--- a/drivers/net/bnx2x_link.c
+++ b/drivers/net/bnx2x_link.c
@@ -1621,6 +1621,39 @@ static u8 bnx2x_ext_phy_resolve_fc(struct link_params *params,
         return ret;
 }
 
+static u8 bnx2x_direct_parallel_detect_used(struct link_params *params)
+{
+        struct bnx2x *bp = params->bp;
+        u16 pd_10g, status2_1000x;
+        CL45_RD_OVER_CL22(bp, params->port,
+                              params->phy_addr,
+                              MDIO_REG_BANK_SERDES_DIGITAL,
+                              MDIO_SERDES_DIGITAL_A_1000X_STATUS2,
+                              &status2_1000x);
+        CL45_RD_OVER_CL22(bp, params->port,
+                              params->phy_addr,
+                              MDIO_REG_BANK_SERDES_DIGITAL,
+                              MDIO_SERDES_DIGITAL_A_1000X_STATUS2,
+                              &status2_1000x);
+        if (status2_1000x & MDIO_SERDES_DIGITAL_A_1000X_STATUS2_AN_DISABLED) {
+                DP(NETIF_MSG_LINK, "1G parallel detect link on port %d\n",
+                         params->port);
+                return 1;
+        }
+
+        CL45_RD_OVER_CL22(bp, params->port,
+                              params->phy_addr,
+                              MDIO_REG_BANK_10G_PARALLEL_DETECT,
+                              MDIO_10G_PARALLEL_DETECT_PAR_DET_10G_STATUS,
+                              &pd_10g);
+
+        if (pd_10g & MDIO_10G_PARALLEL_DETECT_PAR_DET_10G_STATUS_PD_LINK) {
+                DP(NETIF_MSG_LINK, "10G parallel detect link on port %d\n",
+                         params->port);
+                return 1;
+        }
+        return 0;
+}
 
 static void bnx2x_flow_ctrl_resolve(struct link_params *params,
                                   struct link_vars *vars,
@@ -1639,6 +1672,10 @@ static void bnx2x_flow_ctrl_resolve(struct link_params *params,
             (!(vars->phy_flags & PHY_SGMII_FLAG)) &&
             (XGXS_EXT_PHY_TYPE(params->ext_phy_config) ==
              PORT_HW_CFG_XGXS_EXT_PHY_TYPE_DIRECT)) {
+                if (bnx2x_direct_parallel_detect_used(params)) {
+                        vars->flow_ctrl = params->req_fc_auto_adv;
+                        return;
+                }
                 if ((gp_status &
                     (MDIO_GP_STATUS_TOP_AN_STATUS1_CL73_AUTONEG_COMPLETE |
                      MDIO_GP_STATUS_TOP_AN_STATUS1_CL73_MR_LP_NP_AN_ABLE)) ==