linux-kernel - Re: [PATCH v2 0/5] PM: PCI/ACPI: Hibernation handling fixes

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Date:   Mon, 1 Jul 2019 13:30:25 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>
Cc:     Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "Robert R. Howell" <RHowell@...o.edu>
Subject: Re: [PATCH v2 0/5] PM: PCI/ACPI: Hibernation handling fixes

Hi Rafael,

On 01-07-19 12:42, Rafael J. Wysocki wrote:
> Hi All,
> 
> This series of patches addresses a few issues related to the handling of
> hibernation in the PCI bus type and the ACPI PM domain and ACPI LPSS driver.
> 
> The v2 addresses Hans' concerns regarding the LPSS changes.
> 
> First of all, all of the runtime-suspended PCI devices and devices in the ACPI PM and LPSS
> PM domains will be resumed during hibernation (first patch).  This appears to be the
> only way to avoid weird corner cases and the benefit from avoiding to resume those
> devices during hibernation is questionable.
> 
> That change allows the the hibernation callbacks in all of the involved subsystems to be
> simplified (patches 2 and 3).
> 
> Moreover, reusing bus-level suspend callbacks for the "poweroff" transition during
> hibernation (which is the case for the ACPI PM domain and LPSS) is incorrect, so patch 4
> fixes that.
> 
> Finally, there are some leftover items in linux/acpi.h that can be dropped (patch 5).

Thank you for the new version, the entire series looks good to me now:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans

p.s.

FWIW I agree that the calling of the suspend_late method of the i2c-designware driver
at suspend_noirq time is ugly, thank you for adding the comment documenting this.