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Received: from HE1PR0402MB2939.eurprd04.prod.outlook.com (2603:10a6:3:db::18) by AS8PR04MB8468.eurprd04.prod.outlook.com (2603:10a6:20b:34b::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6134.18; Wed, 22 Feb 2023 09:28:42 +0000 Received: from HE1PR0402MB2939.eurprd04.prod.outlook.com ([fe80::4980:91ae:a2a8:14e1]) by HE1PR0402MB2939.eurprd04.prod.outlook.com ([fe80::4980:91ae:a2a8:14e1%4]) with mapi id 15.20.6134.018; Wed, 22 Feb 2023 09:28:42 +0000 From: Clark Wang To: peppe.cavallaro@st.com, alexandre.torgue@foss.st.com, joabreu@synopsys.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mcoquelin.stm32@gmail.com, linux@armlinux.org.uk, andrew@lunn.ch, hkallweit1@gmail.com Cc: netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH net-next V4 1/2] net: phylink: add a function to resume PHY alone to fix resume issue with WoL enabled Date: Wed, 22 Feb 2023 17:26:35 +0800 Message-Id: <20230222092636.1984847-1-xiaoning.wang@nxp.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: SI2PR06CA0001.apcprd06.prod.outlook.com (2603:1096:4:186::21) To HE1PR0402MB2939.eurprd04.prod.outlook.com (2603:10a6:3:db::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0402MB2939:EE_|AS8PR04MB8468:EE_ X-MS-Office365-Filtering-Correlation-Id: 580a852a-76f6-4bcf-7821-08db14b7303c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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The cause of the issue: 1. phylink_resolve() is in a workqueue which will not be executed immediately. This is the call sequence: phylink_resolve()->phylink_link_up()->pl->mac_ops->mac_link_up() For stmmac driver, mac_link_up() will set the correct speed/duplex... values which are from link_state. 2. In stmmac_resume(), it will call stmmac_hw_setup() after called the phylink_resume(), because MAC need PHY rx_clk to do the reset. stmmac_core_init() is called in function stmmac_hw_setup(), which will reset the MAC and set the speed/duplex... to default value. Conclusion: Because phylink_resolve() cannot determine when it is called, it cannot be guaranteed to be called after stmmac_core_init(). Once stmmac_core_init() is called after phylink_resolve(), the MAC will be misconfigured and cannot be used. In order to avoid this problem, add a function called phylink_phy_resume() to resume PHY separately. This eliminates the need to call phylink_resume() before stmmac_hw_setup(). Add another judgement before called phy_start() in phylink_start(). This way phy_start() will not be called multiple times when resumes. At the same time, it may not affect other drivers that do not use phylink_phy_resume(). Signed-off-by: Clark Wang --- V2 change: - add mac_resume_phy_separately flag to struct phylink to mark if the MAC driver uses the phylink_phy_resume() first. V3 change: - add brace to avoid ambiguous 'else' Reported-by: kernel test robot V4: Many thanks to Jakub and Russel for their suggestions, here are the changes for V4. - Unify MAC and PHY in comments and subject to uppercase. - Add subject of the sentence. - Move && to the end of the line - Add notice in the comment of function phylink_phy_resume() --- drivers/net/phy/phylink.c | 35 +++++++++++++++++++++++++++++++++-- include/linux/phylink.h | 1 + 2 files changed, 34 insertions(+), 2 deletions(-) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index ea8fcce5b2d9..0be57e9463d9 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -80,6 +80,8 @@ struct phylink { DECLARE_PHY_INTERFACE_MASK(sfp_interfaces); __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support); u8 sfp_port; + + bool mac_resume_phy_separately; }; #define phylink_printk(level, pl, fmt, ...) \ @@ -1509,6 +1511,7 @@ struct phylink *phylink_create(struct phylink_config *config, return ERR_PTR(-EINVAL); } + pl->mac_resume_phy_separately = false; pl->using_mac_select_pcs = using_mac_select_pcs; pl->phy_state.interface = iface; pl->link_interface = iface; @@ -1942,8 +1945,12 @@ void phylink_start(struct phylink *pl) } if (poll) mod_timer(&pl->link_poll, jiffies + HZ); - if (pl->phydev) - phy_start(pl->phydev); + if (pl->phydev) { + if (!pl->mac_resume_phy_separately) + phy_start(pl->phydev); + else + pl->mac_resume_phy_separately = false; + } if (pl->sfp_bus) sfp_upstream_start(pl->sfp_bus); } @@ -2023,6 +2030,30 @@ void phylink_suspend(struct phylink *pl, bool mac_wol) } EXPORT_SYMBOL_GPL(phylink_suspend); +/** + * phylink_phy_resume() - resume PHY alone + * @pl: a pointer to a &struct phylink returned from phylink_create() + * + * In the MAC driver using phylink, if the MAC needs the clock of the PHY + * when it resumes, it can call this function to resume the PHY separately. + * Then proceed to MAC resume operations. + * + * Note: This function MUST ONLY be called before calling phylink_start() + * in the MAC resume function. + */ +void phylink_phy_resume(struct phylink *pl) +{ + ASSERT_RTNL(); + + if (!test_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state) && + pl->phydev) { + phy_start(pl->phydev); + pl->mac_resume_phy_separately = true; + } + +} +EXPORT_SYMBOL_GPL(phylink_phy_resume); + /** * phylink_resume() - handle a network device resume event * @pl: a pointer to a &struct phylink returned from phylink_create() diff --git a/include/linux/phylink.h b/include/linux/phylink.h index c492c26202b5..6edfab5f754c 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -589,6 +589,7 @@ void phylink_stop(struct phylink *); void phylink_suspend(struct phylink *pl, bool mac_wol); void phylink_resume(struct phylink *pl); +void phylink_phy_resume(struct phylink *pl); void phylink_ethtool_get_wol(struct phylink *, struct ethtool_wolinfo *); int phylink_ethtool_set_wol(struct phylink *, struct ethtool_wolinfo *); From patchwork Wed Feb 22 09:26:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Clark Wang X-Patchwork-Id: 60431 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:5915:0:0:0:0:0 with SMTP id v21csp477852wrd; 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We found the stmmac_hw_setup() when system resumes will called after the stmmac_mac_link_up(). So the correct values set in stmmac_mac_link_up() are overwritten by stmmac_core_init() in phylink_resume(). So call the new added function in phylink to resume PHY firstly. Then can call the stmmac_hw_setup() before calling phy_resume(). Fixes: 90702dcd19c0 ("net: stmmac: fix MAC not working when system resume back with WoL active") Signed-off-by: Clark Wang Reviewed-by: Piotr Raczynski --- V2: - add Fixes tag V3: no change V4: - Unify MAC and PHY in comments and subject to uppercase. --- .../net/ethernet/stmicro/stmmac/stmmac_main.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index e4902a7bb61e..75857b85921a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -7541,16 +7541,9 @@ int stmmac_resume(struct device *dev) } rtnl_lock(); - if (device_may_wakeup(priv->device) && priv->plat->pmt) { - phylink_resume(priv->phylink); - } else { - phylink_resume(priv->phylink); - if (device_may_wakeup(priv->device)) - phylink_speed_up(priv->phylink); - } - rtnl_unlock(); - rtnl_lock(); + phylink_phy_resume(priv->phylink); + mutex_lock(&priv->lock); stmmac_reset_queues_param(priv); @@ -7568,6 +7561,11 @@ int stmmac_resume(struct device *dev) stmmac_enable_all_dma_irq(priv); mutex_unlock(&priv->lock); + + phylink_resume(priv->phylink); + if (device_may_wakeup(priv->device) && !priv->plat->pmt) + phylink_speed_up(priv->phylink); + rtnl_unlock(); netif_device_attach(ndev);