diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 918cb9a919f9..66eea3f963d3 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -60,6 +60,7 @@ struct phylink { u8 act_link_an_mode; /* Active MLO_AN_xxx mode */ u8 link_port; /* The current non-phy ethtool port */ __ETHTOOL_DECLARE_LINK_MODE_MASK(supported); + __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_lpi); /* The link configuration settings */ struct phylink_link_state link_config; @@ -81,12 +82,20 @@ struct phylink { unsigned int pcs_state; bool link_failed; + bool mac_supports_eee_ops; + bool mac_supports_eee; + bool phy_enable_tx_lpi; + bool mac_enable_tx_lpi; + bool mac_tx_clk_stop; + u32 mac_tx_lpi_timer; struct sfp_bus *sfp_bus; bool sfp_may_have_phy; DECLARE_PHY_INTERFACE_MASK(sfp_interfaces); __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support); u8 sfp_port; + + struct eee_config eee_cfg; }; #define phylink_printk(level, pl, fmt, ...) \ @@ -1584,6 +1593,39 @@ static const char *phylink_pause_to_str(int pause) } } +static void phylink_deactivate_lpi(struct phylink *pl) +{ + if (pl->mac_enable_tx_lpi) { + pl->mac_enable_tx_lpi = false; + + phylink_dbg(pl, "disabling LPI\n"); + + pl->mac_ops->mac_disable_tx_lpi(pl->config); + } +} + +static void phylink_activate_lpi(struct phylink *pl) +{ + int err; + + if (!test_bit(pl->cur_interface, pl->config->lpi_interfaces)) { + phylink_dbg(pl, "MAC does not support LPI with %s\n", + phy_modes(pl->cur_interface)); + return; + } + + phylink_dbg(pl, "LPI timer %uus, tx clock stop %u\n", + pl->mac_tx_lpi_timer, pl->mac_tx_clk_stop); + + err = pl->mac_ops->mac_enable_tx_lpi(pl->config, pl->mac_tx_lpi_timer, + pl->mac_tx_clk_stop); + if (!err) + pl->mac_enable_tx_lpi = true; + else + phylink_err(pl, "%ps() failed: %pe\n", + pl->mac_ops->mac_enable_tx_lpi, ERR_PTR(err)); +} + static void phylink_link_up(struct phylink *pl, struct phylink_link_state link_state) { @@ -1630,6 +1672,9 @@ static void phylink_link_up(struct phylink *pl, pl->cur_interface, speed, duplex, !!(link_state.pause & MLO_PAUSE_TX), rx_pause); + if (pl->mac_supports_eee && pl->phy_enable_tx_lpi) + phylink_activate_lpi(pl); + if (ndev) netif_carrier_on(ndev); @@ -1646,6 +1691,9 @@ static void phylink_link_down(struct phylink *pl) if (ndev) netif_carrier_off(ndev); + + phylink_deactivate_lpi(pl); + pl->mac_ops->mac_link_down(pl->config, pl->act_link_an_mode, pl->cur_interface); phylink_info(pl, "Link is Down\n"); @@ -1909,6 +1957,17 @@ struct phylink *phylink_create(struct phylink_config *config, return ERR_PTR(-EINVAL); } + pl->mac_supports_eee_ops = mac_ops->mac_disable_tx_lpi && + mac_ops->mac_enable_tx_lpi; + pl->mac_supports_eee = pl->mac_supports_eee_ops && + pl->config->lpi_capabilities && + !phy_interface_empty(pl->config->lpi_interfaces); + + /* Set the default EEE configuration */ + pl->eee_cfg.eee_enabled = pl->config->eee_enabled_default; + pl->eee_cfg.tx_lpi_enabled = pl->eee_cfg.eee_enabled; + pl->eee_cfg.tx_lpi_timer = pl->config->lpi_timer_default; + pl->phy_state.interface = iface; pl->link_interface = iface; if (iface == PHY_INTERFACE_MODE_MOCA) @@ -2013,16 +2072,22 @@ static void phylink_phy_change(struct phy_device *phydev, bool up) pl->phy_state.link = up; if (!up) pl->link_failed = true; + + /* Get the LPI state from phylib */ + pl->phy_enable_tx_lpi = phydev->enable_tx_lpi; + pl->mac_tx_lpi_timer = phydev->eee_cfg.tx_lpi_timer; mutex_unlock(&pl->state_mutex); phylink_run_resolve(pl); - phylink_dbg(pl, "phy link %s %s/%s/%s/%s/%s\n", up ? "up" : "down", + phylink_dbg(pl, "phy link %s %s/%s/%s/%s/%s/%slpi\n", + up ? "up" : "down", phy_modes(phydev->interface), phy_speed_to_str(phydev->speed), phy_duplex_to_str(phydev->duplex), phy_rate_matching_to_str(phydev->rate_matching), - phylink_pause_to_str(pl->phy_state.pause)); + phylink_pause_to_str(pl->phy_state.pause), + phydev->enable_tx_lpi ? "" : "no"); } static int phylink_validate_phy(struct phylink *pl, struct phy_device *phy, @@ -2152,6 +2217,36 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy, /* Restrict the phy advertisement according to the MAC support. */ linkmode_copy(phy->advertising, config.advertising); + + /* If the MAC supports phylink managed EEE, restrict the EEE + * advertisement according to the MAC's LPI capabilities. + */ + if (pl->mac_supports_eee) { + /* If EEE is enabled, then we need to call phy_support_eee() + * to ensure that the advertising mask is appropriately set. + * This also enables EEE at the PHY. + */ + if (pl->eee_cfg.eee_enabled) + phy_support_eee(phy); + + phy->eee_cfg.tx_lpi_enabled = pl->eee_cfg.tx_lpi_enabled; + phy->eee_cfg.tx_lpi_timer = pl->eee_cfg.tx_lpi_timer; + + /* Convert the MAC's LPI capabilities to linkmodes */ + linkmode_zero(pl->supported_lpi); + phylink_caps_to_linkmodes(pl->supported_lpi, + pl->config->lpi_capabilities); + + /* Restrict the PHYs EEE support/advertisement to the modes + * that the MAC supports. + */ + linkmode_and(phy->advertising_eee, phy->advertising_eee, + pl->supported_lpi); + } else if (pl->mac_supports_eee_ops) { + /* MAC supports phylink EEE, but wants EEE always disabled. */ + phy_disable_eee(phy); + } + mutex_unlock(&pl->state_mutex); mutex_unlock(&phy->lock); @@ -2167,7 +2262,13 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy, if (pl->config->mac_managed_pm) phy->mac_managed_pm = true; - return 0; + /* Allow the MAC to stop its clock if the PHY has the capability */ + pl->mac_tx_clk_stop = phy_eee_tx_clock_stop_capable(phy) > 0; + + /* Explicitly configure whether the PHY is allowed to stop it's + * receive clock. + */ + return phy_eee_rx_clock_stop(phy, pl->config->eee_rx_clk_stop_enable); } static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy, @@ -2324,6 +2425,8 @@ void phylink_disconnect_phy(struct phylink *pl) mutex_lock(&phy->lock); mutex_lock(&pl->state_mutex); pl->phydev = NULL; + pl->phy_enable_tx_lpi = false; + pl->mac_tx_clk_stop = false; mutex_unlock(&pl->state_mutex); mutex_unlock(&phy->lock); flush_work(&pl->resolve); @@ -3078,8 +3181,16 @@ int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_keee *eee) ASSERT_RTNL(); - if (pl->phydev) + if (pl->mac_supports_eee_ops && !pl->mac_supports_eee) + return ret; + + if (pl->phydev) { ret = phy_ethtool_get_eee(pl->phydev, eee); + /* Restrict supported linkmode mask */ + if (ret == 0 && pl->mac_supports_eee_ops) + linkmode_and(eee->supported, eee->supported, + pl->supported_lpi); + } return ret; } @@ -3092,12 +3203,29 @@ EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee); */ int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_keee *eee) { + bool mac_eee = pl->mac_supports_eee; int ret = -EOPNOTSUPP; ASSERT_RTNL(); - if (pl->phydev) + phylink_dbg(pl, "mac %s phylink EEE%s, adv %*pbl, LPI%s timer %uus\n", + mac_eee ? "supports" : "does not support", + eee->eee_enabled ? ", enabled" : "", + __ETHTOOL_LINK_MODE_MASK_NBITS, eee->advertised, + eee->tx_lpi_enabled ? " enabled" : "", eee->tx_lpi_timer); + + if (pl->mac_supports_eee_ops && !mac_eee) + return ret; + + if (pl->phydev) { + /* Restrict advertisement mask */ + if (pl->mac_supports_eee_ops) + linkmode_and(eee->advertised, eee->advertised, + pl->supported_lpi); ret = phy_ethtool_set_eee(pl->phydev, eee); + if (ret == 0) + eee_to_eeecfg(&pl->eee_cfg, eee); + } return ret; } diff --git a/include/linux/phylink.h b/include/linux/phylink.h index f19b7108c840..898b00451bbf 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -5,6 +5,8 @@ #include #include +#include + struct device_node; struct ethtool_cmd; struct fwnode_handle; @@ -143,11 +145,17 @@ enum phylink_op_type { * possible and avoid stopping it during suspend events. * @default_an_inband: if true, defaults to MLO_AN_INBAND rather than * MLO_AN_PHY. A fixed-link specification will override. + * @eee_rx_clk_stop_enable: if true, PHY can stop the receive clock during LPI * @get_fixed_state: callback to execute to determine the fixed link state, * if MAC link is at %MLO_AN_FIXED mode. * @supported_interfaces: bitmap describing which PHY_INTERFACE_MODE_xxx * are supported by the MAC/PCS. + * @lpi_interfaces: bitmap describing which PHY interface modes can support + * LPI signalling. * @mac_capabilities: MAC pause/speed/duplex capabilities. + * @lpi_capabilities: MAC speeds which can support LPI signalling + * @lpi_timer_default: Default EEE LPI timer setting. + * @eee_enabled_default: If set, EEE will be enabled by phylink at creation time */ struct phylink_config { struct device *dev; @@ -156,10 +164,15 @@ struct phylink_config { bool mac_managed_pm; bool mac_requires_rxc; bool default_an_inband; + bool eee_rx_clk_stop_enable; void (*get_fixed_state)(struct phylink_config *config, struct phylink_link_state *state); DECLARE_PHY_INTERFACE_MASK(supported_interfaces); + DECLARE_PHY_INTERFACE_MASK(lpi_interfaces); unsigned long mac_capabilities; + unsigned long lpi_capabilities; + u32 lpi_timer_default; + bool eee_enabled_default; }; void phylink_limit_mac_speed(struct phylink_config *config, u32 max_speed); @@ -173,6 +186,8 @@ void phylink_limit_mac_speed(struct phylink_config *config, u32 max_speed); * @mac_finish: finish a major reconfiguration of the interface. * @mac_link_down: take the link down. * @mac_link_up: allow the link to come up. + * @mac_disable_tx_lpi: disable LPI. + * @mac_enable_tx_lpi: enable and configure LPI. * * The individual methods are described more fully below. */ @@ -193,6 +208,9 @@ struct phylink_mac_ops { struct phy_device *phy, unsigned int mode, phy_interface_t interface, int speed, int duplex, bool tx_pause, bool rx_pause); + void (*mac_disable_tx_lpi)(struct phylink_config *config); + int (*mac_enable_tx_lpi)(struct phylink_config *config, u32 timer, + bool tx_clk_stop); }; #if 0 /* For kernel-doc purposes only. */ @@ -387,6 +405,33 @@ void mac_link_down(struct phylink_config *config, unsigned int mode, void mac_link_up(struct phylink_config *config, struct phy_device *phy, unsigned int mode, phy_interface_t interface, int speed, int duplex, bool tx_pause, bool rx_pause); + +/** + * mac_disable_tx_lpi() - disable LPI generation at the MAC + * @config: a pointer to a &struct phylink_config. + * + * Disable generation of LPI at the MAC, effectively preventing the MAC + * from indicating that it is idle. + */ +void mac_disable_tx_lpi(struct phylink_config *config); + +/** + * mac_enable_tx_lpi() - configure and enable LPI generation at the MAC + * @config: a pointer to a &struct phylink_config. + * @timer: LPI timeout in microseconds. + * @tx_clk_stop: allow xMII transmit clock to be stopped during LPI + * + * Configure the LPI timeout accordingly. This will only be called when + * the link is already up, to cater for situations where the hardware + * needs to be programmed according to the link speed. + * + * Enable LPI generation at the MAC, and configure whether the xMII transmit + * clock may be stopped. + * + * Returns: 0 on success. Please consult with rmk before returning an error. + */ +int mac_enable_tx_lpi(struct phylink_config *config, u32 timer, + bool tx_clk_stop); #endif struct phylink_pcs_ops;