linux-kernel - PCI ASPM regression resulting from commit 4ff116d0d5fd8

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Message-ID: <CAJZ5v0gKUq_A6mBC5stRo20G+Z=9v90AbAQ51c4uKm41OiCKVA@mail.gmail.com>
Date:   Thu, 12 Jan 2023 20:00:33 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Tasev Nikola <tasev.stefanoska@...net.be>,
        Mark Francis Enriquez <enriquezmark36@...il.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Thorsten Leemhuis (regressions address)" <regressions@...mhuis.info>
Subject: PCI ASPM regression resulting from commit 4ff116d0d5fd8

Hi Vidya,

Your commit 4ff116d0d5fd8 ("PCI/ASPM: Save L1 PM Substates Capability
for suspend/resume") has introduced a system resume issue described in
the bug entry at:

https://bugzilla.kernel.org/show_bug.cgi?id=216782

It looks like restoring the L1SS state during system resume has
unexpected side effects.

Can you have a look at this, please?

Thanks,
Rafael