[PATCH v2 net-next 1/3] net: phy: aquantia: print remote capabilities if link partner is Aquantia PHY

[Heiner Kallweit]

If both link partners are Aquantia PHY's then additional information is
exchanged as part of the auto-negotiation. Report remote capabilities
if link partner is Aquantia PHY.

Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
Reviewed-by: Florian Fainelli <f.faine...@gmail.com>
---
 drivers/net/phy/aquantia_main.c | 49 +++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/net/phy/aquantia_main.c b/drivers/net/phy/aquantia_main.c
index 5c148df28..48d63dd1a 100644
--- a/drivers/net/phy/aquantia_main.c
+++ b/drivers/net/phy/aquantia_main.c
@@ -58,6 +58,16 @@
 #define MDIO_AN_RX_LP_STAT1                    0xe820
 #define MDIO_AN_RX_LP_STAT1_1000BASET_FULL     BIT(15)
 #define MDIO_AN_RX_LP_STAT1_1000BASET_HALF     BIT(14)
+#define MDIO_AN_RX_LP_STAT1_SHORT_REACH                BIT(13)
+#define MDIO_AN_RX_LP_STAT1_AQRATE_DOWNSHIFT   BIT(12)
+#define MDIO_AN_RX_LP_STAT1_AQ_PHY             BIT(2)
+
+#define MDIO_AN_RX_LP_STAT4                    0xe823
+#define MDIO_AN_RX_LP_STAT4_FW_MAJOR           GENMASK(15, 8)
+#define MDIO_AN_RX_LP_STAT4_FW_MINOR           GENMASK(7, 0)
+
+#define MDIO_AN_RX_VEND_STAT3                  0xe832
+#define MDIO_AN_RX_VEND_STAT3_AFR              BIT(0)
 
 /* Vendor specific 1, MDIO_MMD_VEND1 */
 #define VEND1_GLOBAL_INT_STD_STATUS            0xfc00
@@ -376,6 +386,43 @@ static int aqcs109_config_init(struct phy_device *phydev)
        return aqr107_set_downshift(phydev, MDIO_AN_VEND_PROV_DOWNSHIFT_DFLT);
 }
 
+static void aqr107_link_change_notify(struct phy_device *phydev)
+{
+       u8 fw_major, fw_minor;
+       bool downshift, short_reach, afr;
+       int val;
+
+       if (phydev->state != PHY_RUNNING || phydev->autoneg == AUTONEG_DISABLE)
+               return;
+
+       val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_RX_LP_STAT1);
+       /* call failed or link partner is no Aquantia PHY */
+       if (val < 0 || !(val & MDIO_AN_RX_LP_STAT1_AQ_PHY))
+               return;
+
+       short_reach = val & MDIO_AN_RX_LP_STAT1_SHORT_REACH;
+       downshift = val & MDIO_AN_RX_LP_STAT1_AQRATE_DOWNSHIFT;
+
+       val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_RX_LP_STAT4);
+       if (val < 0)
+               return;
+
+       fw_major = FIELD_GET(MDIO_AN_RX_LP_STAT4_FW_MAJOR, val);
+       fw_minor = FIELD_GET(MDIO_AN_RX_LP_STAT4_FW_MINOR, val);
+
+       val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_RX_VEND_STAT3);
+       if (val < 0)
+               return;
+
+       afr = val & MDIO_AN_RX_VEND_STAT3_AFR;
+
+       phydev_dbg(phydev, "Link partner is Aquantia PHY, FW %u.%u%s%s%s\n",
+                  fw_major, fw_minor,
+                  short_reach ? ", short reach mode" : "",
+                  downshift ? ", fast-retrain downshift advertised" : "",
+                  afr ? ", fast reframe advertised" : "");
+}
+
 static struct phy_driver aqr_driver[] = {
 {
        PHY_ID_MATCH_MODEL(PHY_ID_AQ1202),
@@ -430,6 +477,7 @@ static struct phy_driver aqr_driver[] = {
        .read_status    = aqr107_read_status,
        .get_tunable    = aqr107_get_tunable,
        .set_tunable    = aqr107_set_tunable,
+       .link_change_notify = aqr107_link_change_notify,
 },
 {
        PHY_ID_MATCH_MODEL(PHY_ID_AQCS109),
@@ -444,6 +492,7 @@ static struct phy_driver aqr_driver[] = {
        .read_status    = aqr107_read_status,
        .get_tunable    = aqr107_get_tunable,
        .set_tunable    = aqr107_set_tunable,
+       .link_change_notify = aqr107_link_change_notify,
 },
 {
        PHY_ID_MATCH_MODEL(PHY_ID_AQR405),
-- 
2.21.0