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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 44ec787d-5d72-4f25-84bf-08db04f5dd25 X-MS-Exchange-CrossTenant-AuthSource: HE1PR0402MB2939.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2023 08:17:02.9279 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: MAO4Ie4UNuXNzcpHBhoWvq89O16atess6pvf4hB644OlP5n6WwvBaCbxhAhW/mklnhARYzY+xA+5nkZpCytvJQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB6912 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230202_003240_428117_6C68D0F2 X-CRM114-Status: GOOD ( 23.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Issue we met: On some platforms, mac cannot work after resumed from the suspend with WoL enabled. 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 --- drivers/net/phy/phylink.c | 32 ++++++++++++++++++++++++++++++-- include/linux/phylink.h | 1 + 2 files changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 319790221d7f..c2fe66f0b78f 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; @@ -1943,8 +1946,12 @@ 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); } @@ -2024,6 +2031,27 @@ 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, can call this function to resume the phy separately. + * Then proceed to MAC resume operations. + */ +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 *);