[PATCH net-next 5/7] net: dsa: felix: delete .phylink_mac_an_restart code

[Vladimir Oltean <olteanv@gmail.com>]

From: Vladimir Oltean <vladimir.oltean@nxp.com>

In hardware, the AN_RESTART field for these SerDes protocols (SGMII,
USXGMII) clears the resolved configuration from the PCS's
auto-negotiation state machine.

But PHYLINK has a different interpretation of "AN restart". It assumes
that this Linux system is capable of re-triggering an auto-negotiation
sequence, something which is only possible with 1000Base-X and
2500Base-X, where the auto-negotiation is symmetrical. In SGMII and
USXGMII, there's an AN master and an AN slave, and it isn't so much of
"auto-negotiation" as it is "PHY passing the resolved link state on to
the MAC".

So, in PHYLINK's interpretation of "AN restart", it doesn't make sense
to do anything for SGMII and USXGMII. In fact, PHYLINK won't even call
us for any other SerDes protocol than 1000Base-X and 2500Base-X. But we
are not supporting those. So just remove this code.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/dsa/ocelot/felix.c         | 10 -------
 drivers/net/dsa/ocelot/felix.h         |  1 -
 drivers/net/dsa/ocelot/felix_vsc9959.c | 37 --------------------------
 3 files changed, 48 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index da337c63e7ca..4ec05090121c 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -296,15 +296,6 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
 						  state->speed);
 }
 
-static void felix_phylink_mac_an_restart(struct dsa_switch *ds, int port)
-{
-	struct ocelot *ocelot = ds->priv;
-	struct felix *felix = ocelot_to_felix(ocelot);
-
-	if (felix->info->pcs_an_restart)
-		felix->info->pcs_an_restart(ocelot, port);
-}
-
 static void felix_phylink_mac_link_down(struct dsa_switch *ds, int port,
 					unsigned int link_an_mode,
 					phy_interface_t interface)
@@ -812,7 +803,6 @@ static const struct dsa_switch_ops felix_switch_ops = {
 	.phylink_validate	= felix_phylink_validate,
 	.phylink_mac_link_state	= felix_phylink_mac_pcs_get_state,
 	.phylink_mac_config	= felix_phylink_mac_config,
-	.phylink_mac_an_restart	= felix_phylink_mac_an_restart,
 	.phylink_mac_link_down	= felix_phylink_mac_link_down,
 	.phylink_mac_link_up	= felix_phylink_mac_link_up,
 	.port_enable		= felix_port_enable,
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index a891736ca006..4a4cebcf04a7 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -31,7 +31,6 @@ struct felix_info {
 	void	(*pcs_init)(struct ocelot *ocelot, int port,
 			    unsigned int link_an_mode,
 			    const struct phylink_link_state *state);
-	void	(*pcs_an_restart)(struct ocelot *ocelot, int port);
 	void	(*pcs_link_state)(struct ocelot *ocelot, int port,
 				  struct phylink_link_state *state);
 	int	(*prevalidate_phy_mode)(struct ocelot *ocelot, int port,
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index c1220b488f9c..7d2673dab7d3 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -728,42 +728,6 @@ static int vsc9959_reset(struct ocelot *ocelot)
 	return 0;
 }
 
-static void vsc9959_pcs_an_restart_sgmii(struct phy_device *pcs)
-{
-	phy_set_bits(pcs, MII_BMCR, BMCR_ANRESTART);
-}
-
-static void vsc9959_pcs_an_restart_usxgmii(struct phy_device *pcs)
-{
-	phy_write_mmd(pcs, MDIO_MMD_VEND2, MII_BMCR,
-		      USXGMII_BMCR_RESET |
-		      USXGMII_BMCR_AN_EN |
-		      USXGMII_BMCR_RST_AN);
-}
-
-static void vsc9959_pcs_an_restart(struct ocelot *ocelot, int port)
-{
-	struct felix *felix = ocelot_to_felix(ocelot);
-	struct phy_device *pcs = felix->pcs[port];
-
-	if (!pcs)
-		return;
-
-	switch (pcs->interface) {
-	case PHY_INTERFACE_MODE_SGMII:
-	case PHY_INTERFACE_MODE_QSGMII:
-		vsc9959_pcs_an_restart_sgmii(pcs);
-		break;
-	case PHY_INTERFACE_MODE_USXGMII:
-		vsc9959_pcs_an_restart_usxgmii(pcs);
-		break;
-	default:
-		dev_err(ocelot->dev, "Invalid PCS interface type %s\n",
-			phy_modes(pcs->interface));
-		break;
-	}
-}
-
 /* We enable SGMII AN only when the PHY has managed = "in-band-status" in the
  * device tree. If we are in MLO_AN_PHY mode, we program directly state->speed
  * into the PCS, which is retrieved out-of-band over MDIO. This also has the
@@ -1412,7 +1376,6 @@ struct felix_info felix_info_vsc9959 = {
 	.mdio_bus_alloc		= vsc9959_mdio_bus_alloc,
 	.mdio_bus_free		= vsc9959_mdio_bus_free,
 	.pcs_init		= vsc9959_pcs_init,
-	.pcs_an_restart		= vsc9959_pcs_an_restart,
 	.pcs_link_state		= vsc9959_pcs_link_state,
 	.prevalidate_phy_mode	= vsc9959_prevalidate_phy_mode,
 	.port_setup_tc          = vsc9959_port_setup_tc,
-- 
2.25.1