net: sfp: enhance quirk for Fibrestore 2.5G copper SFP module

[ Upstream commit cd4a32e60061789676f7f018a94fcc9ec56732a0 ]

Enhance the quirk for Fibrestore 2.5G copper SFP module. The original
commit e27aca3760c0 ("net: sfp: add quirk for FS's 2.5G copper SFP")
introducing the quirk says that the PHY is inaccessible, but that is
not true.

The module uses Rollball protocol to talk to the PHY, and needs a 4
second wait before probing it, same as FS 10G module.

The PHY inside the module is Realtek RTL8221B-VB-CG PHY. The realtek
driver recently gained support to set it up via clause 45 accesses.

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240423085039.26957-2-kabel@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index d999d9baadb26a6200133e55504ec4c8b97db159..6e42d4034b5203ef3e9316a97a5b03a48a88dff2 100644 (file)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -385,18 +385,23 @@ static void sfp_fixup_rollball(struct sfp *sfp)
        sfp->phy_t_retry = msecs_to_jiffies(1000);
 }
 
-static void sfp_fixup_fs_10gt(struct sfp *sfp)
+static void sfp_fixup_fs_2_5gt(struct sfp *sfp)
 {
-       sfp_fixup_10gbaset_30m(sfp);
        sfp_fixup_rollball(sfp);
 
-       /* The RollBall fixup is not enough for FS modules, the AQR chip inside
+       /* The RollBall fixup is not enough for FS modules, the PHY chip inside
         * them does not return 0xffff for PHY ID registers in all MMDs for the
         * while initializing. They need a 4 second wait before accessing PHY.
         */
        sfp->module_t_wait = msecs_to_jiffies(4000);
 }
 
+static void sfp_fixup_fs_10gt(struct sfp *sfp)
+{
+       sfp_fixup_10gbaset_30m(sfp);
+       sfp_fixup_fs_2_5gt(sfp);
+}
+
 static void sfp_fixup_halny_gsfp(struct sfp *sfp)
 {
        /* Ignore the TX_FAULT and LOS signals on this module.
@@ -472,6 +477,10 @@ static const struct sfp_quirk sfp_quirks[] = {
        // Rollball protocol to talk to the PHY.
        SFP_QUIRK_F("FS", "SFP-10G-T", sfp_fixup_fs_10gt),
 
+       // Fiberstore SFP-2.5G-T uses Rollball protocol to talk to the PHY and
+       // needs 4 sec wait before probing the PHY.
+       SFP_QUIRK_F("FS", "SFP-2.5G-T", sfp_fixup_fs_2_5gt),
+
        // Fiberstore GPON-ONU-34-20BI can operate at 2500base-X, but report 1.2GBd
        // NRZ in their EEPROM
        SFP_QUIRK("FS", "GPON-ONU-34-20BI", sfp_quirk_2500basex,
@@ -488,9 +497,6 @@ static const struct sfp_quirk sfp_quirks[] = {
        SFP_QUIRK("HUAWEI", "MA5671A", sfp_quirk_2500basex,
                  sfp_fixup_ignore_tx_fault),
 
-       // FS 2.5G Base-T
-       SFP_QUIRK_M("FS", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
-
        // Lantech 8330-262D-E can operate at 2500base-X, but incorrectly report
        // 2500MBd NRZ in their EEPROM
        SFP_QUIRK_M("Lantech", "8330-262D-E", sfp_quirk_2500basex),