From 90ef0a7b0622c62758b2638604927867775479ea Mon Sep 17 00:00:00 2001
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Thu, 13 Jul 2023 09:42:07 +0100
Subject: [PATCH] net: phylink: add pcs_enable()/pcs_disable() methods
Add phylink PCS enable/disable callbacks that will allow us to place
IEEE 802.3 register compliant PCS in power-down mode while not being
used.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/phy/phylink.c | 48 +++++++++++++++++++++++++++++++--------
include/linux/phylink.h | 16 +++++++++++++
2 files changed, 55 insertions(+), 9 deletions(-)
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -34,6 +34,10 @@ enum {
PHYLINK_DISABLE_STOPPED,
PHYLINK_DISABLE_LINK,
PHYLINK_DISABLE_MAC_WOL,
+
+ PCS_STATE_DOWN = 0,
+ PCS_STATE_STARTING,
+ PCS_STATE_STARTED,
};
/**
@@ -72,6 +76,7 @@ struct phylink {
struct mutex state_mutex;
struct phylink_link_state phy_state;
struct work_struct resolve;
+ unsigned int pcs_state;
bool mac_link_dropped;
bool using_mac_select_pcs;
@@ -798,6 +803,22 @@ static void phylink_mac_pcs_an_restart(s
}
}
+static void phylink_pcs_disable(struct phylink_pcs *pcs)
+{
+ if (pcs && pcs->ops->pcs_disable)
+ pcs->ops->pcs_disable(pcs);
+}
+
+static int phylink_pcs_enable(struct phylink_pcs *pcs)
+{
+ int err = 0;
+
+ if (pcs && pcs->ops->pcs_enable)
+ err = pcs->ops->pcs_enable(pcs);
+
+ return err;
+}
+
static void phylink_major_config(struct phylink *pl, bool restart,
const struct phylink_link_state *state)
{
@@ -835,12 +856,16 @@ static void phylink_major_config(struct
* for the change.
*/
if (pcs_changed) {
+ phylink_pcs_disable(pl->pcs);
pl->pcs = pcs;
pl->pcs_ops = pcs->ops;
}
phylink_mac_config(pl, state);
+ if (pl->pcs_state == PCS_STATE_STARTING || pcs_changed)
+ phylink_pcs_enable(pl->pcs);
+
if (pl->pcs_ops) {
err = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
state->interface,
@@ -1264,6 +1289,7 @@ struct phylink *phylink_create(struct ph
pl->link_config.speed = SPEED_UNKNOWN;
pl->link_config.duplex = DUPLEX_UNKNOWN;
pl->link_config.an_enabled = true;
+ pl->pcs_state = PCS_STATE_DOWN;
pl->mac_ops = mac_ops;
__set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
@@ -1655,6 +1681,8 @@ void phylink_start(struct phylink *pl)
if (pl->netdev)
netif_carrier_off(pl->netdev);
+ pl->pcs_state = PCS_STATE_STARTING;
+
/* Apply the link configuration to the MAC when starting. This allows
* a fixed-link to start with the correct parameters, and also
* ensures that we set the appropriate advertisement for Serdes links.
@@ -1665,6 +1693,8 @@ void phylink_start(struct phylink *pl)
*/
phylink_mac_initial_config(pl, true);
+ pl->pcs_state = PCS_STATE_STARTED;
+
clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
phylink_run_resolve(pl);
@@ -1684,16 +1714,9 @@ void phylink_start(struct phylink *pl)
poll = true;
}
- switch (pl->cfg_link_an_mode) {
- case MLO_AN_FIXED:
+ if (pl->cfg_link_an_mode == MLO_AN_FIXED)
poll |= pl->config->poll_fixed_state;
- break;
- case MLO_AN_INBAND:
- poll |= pl->config->pcs_poll;
- if (pl->pcs)
- poll |= pl->pcs->poll;
- break;
- }
+
if (poll)
mod_timer(&pl->link_poll, jiffies + HZ);
if (pl->phydev)
@@ -1730,6 +1753,10 @@ void phylink_stop(struct phylink *pl)
}
phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
+
+ pl->pcs_state = PCS_STATE_DOWN;
+
+ phylink_pcs_disable(pl->pcs);
}
EXPORT_SYMBOL_GPL(phylink_stop);
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -419,6 +419,8 @@ struct phylink_pcs {
/**
* struct phylink_pcs_ops - MAC PCS operations structure.
* @pcs_validate: validate the link configuration.
+ * @pcs_enable: enable the PCS.
+ * @pcs_disable: disable the PCS.
* @pcs_get_state: read the current MAC PCS link state from the hardware.
* @pcs_config: configure the MAC PCS for the selected mode and state.
* @pcs_an_restart: restart 802.3z BaseX autonegotiation.
@@ -428,6 +430,8 @@ struct phylink_pcs {
struct phylink_pcs_ops {
int (*pcs_validate)(struct phylink_pcs *pcs, unsigned long *supported,
const struct phylink_link_state *state);
+ int (*pcs_enable)(struct phylink_pcs *pcs);
+ void (*pcs_disable)(struct phylink_pcs *pcs);
void (*pcs_get_state)(struct phylink_pcs *pcs,
struct phylink_link_state *state);
int (*pcs_config)(struct phylink_pcs *pcs, unsigned int mode,
@@ -458,6 +462,18 @@ int pcs_validate(struct phylink_pcs *pcs
const struct phylink_link_state *state);
/**
+ * pcs_enable() - enable the PCS.
+ * @pcs: a pointer to a &struct phylink_pcs.
+ */
+int pcs_enable(struct phylink_pcs *pcs);
+
+/**
+ * pcs_disable() - disable the PCS.
+ * @pcs: a pointer to a &struct phylink_pcs.
+ */
+void pcs_disable(struct phylink_pcs *pcs);
+
+/**
* pcs_get_state() - Read the current inband link state from the hardware
* @pcs: a pointer to a &struct phylink_pcs.
* @state: a pointer to a &struct phylink_link_state.