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