linux-kernel - Re: [PATCH 3/3] PCI: Convert rtw88 power cycle quirk to shutdown quirk

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Date:   Fri, 26 Feb 2021 20:18:28 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Yan-Hsuan Chuang <tony0620emma@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 3/3] PCI: Convert rtw88 power cycle quirk to shutdown quirk

On Fri, Feb 26, 2021 at 8:10 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> On 26.02.2021 08:12, Kalle Valo wrote:
> > Kai-Heng Feng <kai.heng.feng@...onical.com> writes:
> >
> >> Now we have a generic D3 shutdown quirk, so convert the original
> >> approach to a PCI quirk.
> >>
> >> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> >> ---
> >>  drivers/net/wireless/realtek/rtw88/pci.c | 2 --
> >>  drivers/pci/quirks.c                     | 6 ++++++
> >>  2 files changed, 6 insertions(+), 2 deletions(-)
> >
> > It would have been nice to CC linux-wireless also on patches 1-2. I only
> > saw patch 3 and had to search the rest of patches from lkml.
> >
> > I assume this goes via the PCI tree so:
> >
> > Acked-by: Kalle Valo <kvalo@...eaurora.org>
> >
>
> To me it looks odd to (mis-)use the quirk mechanism to set a device
> to D3cold on shutdown. As I see it the quirk mechanism is used to work
> around certain device misbehavior. And setting a device to a D3
> state on shutdown is a normal activity, and the shutdown() callback
> seems to be a good place for it.
> I miss an explanation what the actual benefit of the change is.

To make putting device to D3 more generic, as there are more than one
device need the quirk.

Here's the discussion:
https://lore.kernel.org/linux-usb/00de6927-3fa6-a9a3-2d65-2b4d4e8f0012@linux.intel.com/

Kai-Heng