set_controller_speed(9)

💖 set_controller_speed(9) 💖

Okay bestie, welcome to the Kernel API Manual — this page is all about set_controller_speed, and it’s lowkey iconic 💅

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✨ NAME ✨

set_controller_speed — set the frequency and/or mode of a specific controller segment. Periodt 🎀

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🌸 SYNOPSIS 🌸

u8 set_controller_speed (struct controller *ctrl , u8 adapter_speed , u8
hp_slot );

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🎀 ARGUMENTS 🎀

• ctrl — the controller to change frequency/mode for 🦋
• adapter_speed — the speed of the adapter we want to match ⭐
• hp_slot — the slot number where the adapter is installed 🍓

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🫶 DESCRIPTION 🫶

Returns 0 if we successfully change the frequency and/or mode to match the adapter speed. That’s the success vibe check, no cap 💖

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/pci/hotplug/cpqphp_ctrl.c — go say hi to these besties:

• cpqhp_find_slot(9)
• sort_by_size(9)
• sort_by_max_size(9)
• do_pre_bridge_resource_split(9)
• do_bridge_resource_split(9)
• get_io_resource(9)
• get_max_resource(9)
• get_resource(9)
• cpqhp_resource_sort_and_combine(9)
• cpqhp_slot_create(9)
• slot_remove(9)
• bridge_slot_remove(9)
• cpqhp_slot_find(9)
• board_replaced(9)
• board_added(9)
• remove_board(9)
• cpqhp_pushbutton_thread(9)
• switch_leds(9)
• cpqhp_hardware_test(9)
• configure_new_device(9)
• configure_new_function(9)

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Source/version vibes: ./drivers/pci/hotplug · dated October 2026 · starring set_controller_speed(9) 💅✨