r8169: fix RTL8116af can not enter s0idle and c10

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RTL8116AF is a multi-function device. Functions 2 to 7 are hidden from
the PCI core and return an all-ones response when their vendor ID is read,
so they are not enumerated as normal PCI functions.

However, these hidden functions can still affect platform power
management. If they are left in D0 or keep ASPM disabled, the platform may
fail to enter the low-power s0ix state and the CPU package may fail to
enter Package C10.

Put functions 2 to 7 into D3hot and enable ASPM on their PCIe link control
register. Since these functions are hidden, access their configuration
space through pci_bus_read_config_dword() / pci_bus_write_config_dword()
using the same slot and the target function numbers.

Ignore functions that return a PCI error response when reading their
configuration space.

Signed-off-by: Javen Xu <javen_xu@realsil.com.cn>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260831053745.1197-8-javen_xu@realsil.com.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Javen Xu 2026-08-31 13:37:45 +08:00 • committed by Jakub Kicinski

parent 6e445f3d95

commit a306cbd79e

1 changed files with 42 additions and 0 deletions

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drivers/net/ethernet/realtek/r8169_main.c

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