linux-kernel - Re: [PATCH v1 1/2] PCI: PM: Add special case handling for PCIe device wakeup

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Date:   Thu, 29 Jul 2021 17:09:45 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linux PCI <linux-pci@...r.kernel.org>
Cc:     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 1/2] PCI: PM: Add special case handling for PCIe device wakeup

On Thu, Jul 29, 2021 at 4:49 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> It is inconsistent to return PCI_D0 from pci_target_state() instead
> of the original target state if 'wakeup' is true and the device
> cannot signal PME from D0.
>
> This only happens when the device cannot signal PME from the original
> target state and any shallower power states (including D0) and that
> case is effectively equivalent to the one in which PME signaling is
> not supported at all.  Since the original target state is returned in
> the latter case, make the function do that in the former one too.
>
> Link: https://lore.kernel.org/linux-pm/3149540.aeNJFYEL58@kreacher/
> Fixes: 666ff6f83e1d ("PCI/PM: Avoid using device_may_wakeup() for runtime PM")
> Reported-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Reported-by: Utkarsh H Patel <utkarsh.h.patel@...el.com>
> Reported-by: Koba Ko <koba.ko@...onical.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The subject of this patch should be different, let me resend it.