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Subject[PATCH 4.19 138/321] bnxt_en: query force speeds before disabling autoneg mode.
Date
From: Vasundhara Volam <vasundhara-v.volam@broadcom.com>

[ Upstream commit 56d374624778652d2a999e18c87a25338b127b41 ]

With autoneg enabled, PHY loopback test fails. To disable autoneg,
driver needs to send a valid forced speed to FW. FW is not sending
async event for invalid speeds. To fix this, query forced speeds
and send the correct speed when disabling autoneg mode.

Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 22 ++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index eaa285bf908b9..2240c23b0a4c9 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -2390,17 +2390,37 @@ static int bnxt_hwrm_mac_loopback(struct bnxt *bp, bool enable)
return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
}

+static int bnxt_query_force_speeds(struct bnxt *bp, u16 *force_speeds)
+{
+ struct hwrm_port_phy_qcaps_output *resp = bp->hwrm_cmd_resp_addr;
+ struct hwrm_port_phy_qcaps_input req = {0};
+ int rc;
+
+ bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_PORT_PHY_QCAPS, -1, -1);
+ mutex_lock(&bp->hwrm_cmd_lock);
+ rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+ if (!rc)
+ *force_speeds = le16_to_cpu(resp->supported_speeds_force_mode);
+
+ mutex_unlock(&bp->hwrm_cmd_lock);
+ return rc;
+}
+
static int bnxt_disable_an_for_lpbk(struct bnxt *bp,
struct hwrm_port_phy_cfg_input *req)
{
struct bnxt_link_info *link_info = &bp->link_info;
- u16 fw_advertising = link_info->advertising;
+ u16 fw_advertising;
u16 fw_speed;
int rc;

if (!link_info->autoneg)
return 0;

+ rc = bnxt_query_force_speeds(bp, &fw_advertising);
+ if (rc)
+ return rc;
+
fw_speed = PORT_PHY_CFG_REQ_FORCE_LINK_SPEED_1GB;
if (netif_carrier_ok(bp->dev))
fw_speed = bp->link_info.link_speed;
--
2.20.1


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