linux-kernel - Re: [PATCH 0/2] Add a workaround for s2idle resume on Lenovo laptops

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Date:   Mon, 2 May 2022 17:31:53 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Mark Pearson <markpearson@...ovo.com>
Cc:     Henrique de Moraes Holschuh <hmh@....eng.br>,
        Mark Gross <mgross@...ux.intel.com>,
        "open list:THINKPAD ACPI EXTRAS DRIVER" 
        <ibm-acpi-devel@...ts.sourceforge.net>,
        "open list:THINKPAD ACPI EXTRAS DRIVER" 
        <platform-driver-x86@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Add a workaround for s2idle resume on Lenovo laptops

Hi,

On 4/29/22 05:04, Mario Limonciello wrote:
> Lenovo Thinkpads have a SMI handler during the D0 transition for NVME
> devices specifically during resume from s2idle.  When the IOMMU
> translation layer is enabled for NVME devices (which is the default
> behavior per the IVRS table), then this SMI handler causes a very long
> resume time (10+ seconds).
> 
> For the common s2idle circumstance on Linux this SMI handler is
> unnecessary and just significantly inflates resume time. To avoid it,
> add a new s2idle resume handler to thinkpad_acpi that will prevent it
> from running on known problematic systems.  If the SMI handler is fixed on
> these systems the DMI data can be modified to exclude them or only match
> problematic BIOS versions.
> 
> Mario Limonciello (2):
>   platform/x86: thinkpad_acpi: Convert btusb DMI list to quirks
>   platform/x86: thinkpad_acpi: Add a s2idle resume quirk for a number of
>     laptops
> 
>  drivers/platform/x86/thinkpad_acpi.c | 134 ++++++++++++++++++++++++++-
>  1 file changed, 131 insertions(+), 3 deletions(-)

Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

I'll also cherry-pick these into the pdx86 fixes branch and add them
to my next 5.18 fixes pull-req to Linus.

Regards,

Hans