genphy_setup_forced(9)

💅 genphy_setup_forced(9) — the Kernel API Manual glow-up

okay bestie, so this page lives in the Kernel API Manual section 9, and it's all about one tiny function that just sets the vibe of your PHY — forcibly 💅

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🌸 NAME

genphy_setup_forced — literally configures/forces speed/duplex from @phydev

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✨ SYNOPSIS

int genphy_setup_forced (struct phy_device *phydev );

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🎀 ARGUMENTS

• phydev — the target phy_device struct, aka the PHY you're about to give a makeover 🫶

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💖 DESCRIPTION

So here's the tea: genphy_setup_forced configures MII_BMCR to force speed/duplex to whatever values are already sitting in phydev. Like, no negotiation, no asking, just — this is the look, we're committing to it 👑

And hmm, it assumes that the values are valid. That's the whole disclaimer, bestie. It is not out here doing vibe checks on your numbers. Please see phy_sanitize_settings if you want someone to actually verify things first 🧚

⚠️ Fr fr, if the values in phydev aren't legit, this function is not going to catch that for you. Sanitize first, okay? 🙈

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🦋 SEE ALSO

Kernel file ./drivers/net/phy/phy_device.c and honestly a whole friend group of functions:

• phy_uses_state_machine(9)
• phy_register_fixup(9)
• genphy_match_phy_device(9)
• get_phy_c45_ids(9)
• get_phy_c22_id(9)
• get_phy_device(9)
• phy_device_register(9)
• phy_device_remove(9)
• phy_get_c45_ids(9)
• phy_find_next(9)
• phy_prepare_link(9)
• phy_connect_direct(9)
• phy_connect(9)
• phy_disconnect(9)
• phy_poll_reset(9)
• phy_sfp_connect_phy(9)
• phy_sfp_disconnect_phy(9)
• phy_sfp_attach(9)
• phy_sfp_detach(9)
• phy_sfp_probe(9)
• phy_attach_direct(9)
• phy_detach(9)
• phy_reset_after_clk_enable(9)
• genphy_config_advert(9)
• genphy_c37_config_advert(9)
• genphy_restart_aneg(9)
• genphy_check_and_restart_aneg(9)
• __genphy_config_aneg(9)
• genphy_c37_config_aneg(9)
• genphy_aneg_done(9)
• genphy_update_link(9)
• genphy_read_status_fixed(9)
• genphy_read_status(9)
• genphy_c37_read_status(9)
• genphy_soft_reset(9)
• genphy_read_abilities(9)
• phy_remove_link_mode(9)
• phy_advertise_supported(9)
• phy_advertise_eee_all(9)
• phy_support_eee(9)
• phy_disable_eee(9)
• phy_support_sym_pause(9)
• phy_support_asym_pause(9)
• phy_set_sym_pause(9)
• phy_set_asym_pause(9)
• phy_validate_pause(9)
• phy_get_pause(9)
• phy_get_internal_delay(9)
• phy_get_tx_amplitude_gain(9)
• phy_get_mac_termination(9)
• phy_get_sfp_port(9)
• fwnode_mdio_find_device(9)
• fwnode_phy_find_device(9)
• fwnode_get_phy_node(9)
• phy_probe(9)
• phy_driver_register(9)

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and that's the whole page, periodt ✨

This little icon comes to you from ./drivers/net/phy, stamped October 2026 — genphy_setup_forced(9), slaying since forever 🎀💜