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Date: Mon, 13 Jun 2022 14:00:46 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
Marek Behún <kabel@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
Paolo Abeni <pabeni@...hat.com>,
Robert Hancock <robert.hancock@...ian.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH net-next 05/15] 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@...linux.org.uk>
---
drivers/net/phy/phylink.c | 48 +++++++++++++++++++++++++++++++--------
include/linux/phylink.h | 16 +++++++++++++
2 files changed, 55 insertions(+), 9 deletions(-)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 24ef98950600..7721aea73c86 100644
--- 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,
};
/**
@@ -71,6 +75,7 @@ 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;
@@ -758,6 +763,22 @@ static void phylink_resolve_flow(struct phylink_link_state *state)
}
}
+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_pcs_poll_stop(struct phylink *pl)
{
if (pl->cfg_link_an_mode == MLO_AN_INBAND)
@@ -766,7 +787,8 @@ static void phylink_pcs_poll_stop(struct phylink *pl)
static void phylink_pcs_poll_start(struct phylink *pl)
{
- if (pl->pcs->poll && pl->cfg_link_an_mode == MLO_AN_INBAND)
+ if (pl->pcs && pl->pcs->poll &&
+ pl->cfg_link_an_mode == MLO_AN_INBAND)
mod_timer(&pl->link_poll, jiffies + HZ);
}
@@ -834,11 +856,16 @@ static void phylink_major_config(struct phylink *pl, bool restart,
* for the change.
*/
if (pcs_changed) {
+ phylink_pcs_disable(pl->pcs);
+
pl->pcs = pcs;
}
phylink_mac_config(pl, state);
+ if (pl->pcs_state == PCS_STATE_STARTING || pcs_changed)
+ phylink_pcs_enable(pl->pcs);
+
if (pl->pcs) {
err = pl->pcs->ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
state->interface,
@@ -1273,6 +1300,7 @@ struct phylink *phylink_create(struct phylink_config *config,
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);
@@ -1639,6 +1667,8 @@ 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.
@@ -1649,6 +1679,8 @@ void phylink_start(struct phylink *pl)
*/
phylink_mac_initial_config(pl, true);
+ pl->pcs_state = PCS_STATE_STARTED;
+
phylink_enable_and_run_resolve(pl, PHYLINK_DISABLE_STOPPED);
if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
@@ -1667,15 +1699,9 @@ 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:
- if (pl->pcs)
- poll |= pl->pcs->poll;
- break;
- }
+
if (poll)
mod_timer(&pl->link_poll, jiffies + HZ);
if (pl->phydev)
@@ -1712,6 +1738,10 @@ 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);
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 91ba7e4d72db..eece482bce17 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -432,6 +432,8 @@ 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.
@@ -441,6 +443,8 @@ 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,
@@ -470,6 +474,18 @@ struct phylink_pcs_ops {
int pcs_validate(struct phylink_pcs *pcs, unsigned long *supported,
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.
--
2.30.2
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