kernel.git/drivers/net/phy/smsc.c, branch linux-5.10.y

net: phy: smsc: add proper reset flags for LAN8710A

2025-08-28T14:22:47Z

[ Upstream commit 57ec5a8735dc5dccd1ee68afdb1114956a3fce0d ] According to the LAN8710A datasheet (Rev. B, section 3.8.5.1), a hardware reset is required after power-on, and the reference clock (REF_CLK) must be established before asserting reset. Signed-off-by: Buday Csaba Cc: Csókás Bence Reviewed-by: Andrew Lunn Link: https://patch.msgid.link/20250728152916.46249-2-csokas.bence@prolan.hu Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net: phy: smsc: Fix link failure in forced mode with Auto-MDIX

2025-07-17T16:27:53Z

[ Upstream commit 9dfe110cc0f6ef42af8e81ce52aef34a647d0b8a ] Force a fixed MDI-X mode when auto-negotiation is disabled to prevent link instability. When forcing the link speed and duplex on a LAN9500 PHY (e.g., with `ethtool -s eth0 autoneg off ...`) while leaving MDI-X control in auto mode, the PHY fails to establish a stable link. This occurs because the PHY's Auto-MDIX algorithm is not designed to operate when auto-negotiation is disabled. In this state, the PHY continuously toggles the TX/RX signal pairs, which prevents the link partner from synchronizing. This patch resolves the issue by detecting when auto-negotiation is disabled. If the MDI-X control mode is set to 'auto', the driver now forces a specific, stable mode (ETH_TP_MDI) to prevent the pair toggling. This choice of a fixed MDI mode mirrors the behavior the hardware would exhibit if the AUTOMDIX_EN strap were configured for a fixed MDI connection. Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support") Signed-off-by: Oleksij Rempel Cc: Andre Edich Reviewed-by: Andrew Lunn Link: https://patch.msgid.link/20250703114941.3243890-4-o.rempel@pengutronix.de Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net: phy: smsc: Fix Auto-MDIX configuration when disabled by strap

2025-07-17T16:27:53Z

[ Upstream commit a141af8eb2272ab0f677a7f2653874840bc9b214 ] Correct the Auto-MDIX configuration to ensure userspace settings are respected when the feature is disabled by the AUTOMDIX_EN hardware strap. The LAN9500 PHY allows its default MDI-X mode to be configured via a hardware strap. If this strap sets the default to "MDI-X off", the driver was previously unable to enable Auto-MDIX from userspace. When handling the ETH_TP_MDI_AUTO case, the driver would set the SPECIAL_CTRL_STS_AMDIX_ENABLE_ bit but neglected to set the required SPECIAL_CTRL_STS_OVRRD_AMDIX_ bit. Without the override flag, the PHY falls back to its hardware strap default, ignoring the software request. This patch corrects the behavior by also setting the override bit when enabling Auto-MDIX. This ensures that the userspace configuration takes precedence over the hardware strap, allowing Auto-MDIX to be enabled correctly in all scenarios. Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support") Signed-off-by: Oleksij Rempel Cc: Andre Edich Reviewed-by: Maxime Chevallier Link: https://patch.msgid.link/20250703114941.3243890-2-o.rempel@pengutronix.de Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net: phy: smsc: bail out in lan87xx_read_status if genphy_read_status fails

2023-03-22T12:29:58Z

[ Upstream commit c22c3bbf351e4ce905f082649cffa1ff893ea8c1 ] If genphy_read_status fails then further access to the PHY may result in unpredictable behavior. To prevent this bail out immediately if genphy_read_status fails. Fixes: 4223dbffed9f ("net: phy: smsc: Re-enable EDPD mode for LAN87xx") Signed-off-by: Heiner Kallweit Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/026aa4f2-36f5-1c10-ab9f-cdb17dda6ac4@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin

net: phy: lan87xx: fix access to wrong register of LAN87xx

2021-05-14T07:50:31Z

[ Upstream commit fdb5cc6ab3b6a1c0122d3644a63ef9dc7a610d35 ] The function lan87xx_config_aneg_ext was introduced to configure LAN95xxA but as well writes to undocumented register of LAN87xx. This fix prevents that access. The function lan87xx_config_aneg_ext gets more suitable for the new behavior name. Reported-by: Måns Rullgård Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support") Signed-off-by: Andre Edich Signed-off-by: David S. Miller Signed-off-by: Sasha Levin

net: phy: smsc: fix clk error handling

2021-01-23T15:04:03Z

[ Upstream commit a18caa97b1bda0a3d126a7be165ddcfc56c2dde6 ] Commit bedd8d78aba3 ("net: phy: smsc: LAN8710/20: add phy refclk in support") added the phy clk support. The commit already checks if clk_get_optional() throw an error but instead of returning the error it ignores it. Fixes: bedd8d78aba3 ("net: phy: smsc: LAN8710/20: add phy refclk in support") Suggested-by: Jakub Kicinski Signed-off-by: Marco Felsch Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20210111085932.28680-1-m.felsch@pengutronix.de Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman

net: phy: smsc: add missed clk_disable_unprepare in smsc_phy_probe()

2020-11-14T19:21:13Z

Add the missing clk_disable_unprepare() before return from smsc_phy_probe() in the error handling case. Fixes: bedd8d78aba3 ("net: phy: smsc: LAN8710/20: add phy refclk in support") Reported-by: Hulk Robot Signed-off-by: Zhang Changzhong Link: https://lore.kernel.org/r/1605180239-1792-1-git-send-email-zhangchangzhong@huawei.com Signed-off-by: Jakub Kicinski

net: phy: smsc: LAN8710/20: remove PHY_RST_AFTER_CLK_EN flag

2020-09-09T21:15:02Z

Don't reset the phy without respect to the PHY library state machine because this breaks the phy IRQ mode. The same behaviour can be archived now by specifying the refclk. Signed-off-by: Marco Felsch Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller

net: phy: smsc: LAN8710/20: add phy refclk in support

2020-09-09T21:15:02Z

Add support to specify the clock provider for the PHY refclk and don't rely on 'magic' host clock setup. [1] tried to address this by introducing a flag and fixing the corresponding host. But this commit breaks the IRQ support since the irq setup during .config_intr() is thrown away because the reset comes from the side without respecting the current PHY state within the PHY library state machine. Furthermore the commit fixed the problem only for FEC based hosts other hosts acting like the FEC are not covered. This commit goes the other way around to address the bug fixed by [1]. Instead of resetting the device from the side every time the refclk gets (re-)enabled it requests and enables the clock till the device gets removed. Now the PHY library is the only place where the PHY gets reset to respect the PHY library state machine. [1] commit 7f64e5b18ebb ("net: phy: smsc: LAN8710/20: add PHY_RST_AFTER_CLK_EN flag") Signed-off-by: Marco Felsch Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller

net: phy: smsc: simplify config_init callback

2020-09-09T21:15:02Z

Exit the driver specific config_init hook early if energy detection is disabled. We can do this because we don't need to clear the interrupt status here. Clearing the status should be removed anyway since this is handled by the phy_enable_interrupts(). Signed-off-by: Marco Felsch Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller