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After17423360a2("PCI/ASPM: Save L1 PM Substates Capability for suspend/resume"), pci_save_aspm_l1ss_state(dev) saves the L1SS state for "dev", and pci_restore_aspm_l1ss_state(dev) restores the state for both "dev" and its parent. The problem is that unless pci_save_state() has been used in some other path and has already saved the parent L1SS state, we will restore junk to the parent, which means the L1 Substates likely won't work correctly. Save the L1SS config for both the device and its parent in pci_save_aspm_l1ss_state(). When restoring, we need both because L1SS must be enabled at the parent (the Downstream Port) before being enabled at the child (the Upstream Port). Link: https://lore.kernel.org/r/20241115072200.37509-3-jhp@endlessos.org Fixes:17423360a2("PCI/ASPM: Save L1 PM Substates Capability for suspend/resume") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218394 Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Jian-Hong Pan <jhp@endlessos.org> [bhelgaas: parallel save/restore structure, simplify commit log, patch at https://lore.kernel.org/r/20241212230340.GA3267194@bhelgaas] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Jian-Hong Pan <jhp@endlessos.org> # Asus B1400CEAE
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.