linux-kernel - Re: [PATCH v1 2/2] PCI: PM: Enable PME if it can be signaled from D3cold

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Message-ID: <CAJZ5v0gZ=Zk+RO_+=8hUtkeTgB9dHGcNVHsiTJdw_EZEsiKWSQ@mail.gmail.com>
Date:   Fri, 30 Jul 2021 14:13:09 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Utkarsh H Patel <utkarsh.h.patel@...el.com>,
        Koba Ko <koba.ko@...onical.com>
Subject: Re: [PATCH v1 2/2] PCI: PM: Enable PME if it can be signaled from D3cold

On Fri, Jul 30, 2021 at 12:28 PM Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
>
> On Thu, Jul 29, 2021 at 04:49:10PM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > PME signaling is only enabled by __pci_enable_wake() if the target
> > device can signal PME from the given target power state (to avoid
> > pointless reconfiguration of the device), but if the hierarchy above
> > the device goes into D3cold, the device itself will end up in D3cold
> > too, so if it can signal PME from D3cold, it should be enabled to
> > do so in __pci_enable_wake().
> >
> > [Note that if the device does not end up in D3cold and it cannot
> >  signal PME from the original target power state, it will not signal
> >  PME, so in that case the behavior does not change.]
> >
> > Link: https://lore.kernel.org/linux-pm/3149540.aeNJFYEL58@kreacher/
> > Fixes: 5bcc2fb4e815 ("PCI PM: Simplify PCI wake-up code")
> > Reported-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
>
> Also this solves the reported issue so,
>
> Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Thank you!

I'll queue up these two patches for 5.15 barring any objections from Bjorn.