linux-kernel - Re: [PATCH v6] PCI: Avoid putting some root ports into D3 on TUXEDO Sirius Gen1

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Message-ID: <20250115115954.GQ4176564@rocinante>
Date: Wed, 15 Jan 2025 20:59:54 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Werner Sembach <wse@...edocomputers.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] PCI: Avoid putting some root ports into D3 on TUXEDO
 Sirius Gen1

Hello,

> commit 9d26d3a8f1b0 ("PCI: Put PCIe ports into D3 during suspend") sets the
> policy that all PCIe ports are allowed to use D3.  When the system is
> suspended if the port is not power manageable by the platform and won't be
> used for wakeup via a PME this sets up the policy for these ports to go
> into D3hot.
> 
> This policy generally makes sense from an OSPM perspective but it leads to
> problems with wakeup from suspend on the TUXEDO Sirius 16 Gen 1 with a
> specific old BIOS. This manifests as a system hang.
> 
> On the affected Device + BIOS combination, add a quirk for the root port of
> the problematic controller to ensure that these root ports are not put into
> D3hot at suspend.

Applied to pci-fixup for v6.14, thank you!

	Krzysztof