linux-kernel - Re: [PATCH] PCI: Avoid broken MSI on SB600 USB devices

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Message-ID: <CAHp75VcQV8dCxhtsRRiy-UYcVDjzn3mPe3Hx-f7JS8CTxrQKqw@mail.gmail.com>
Date:   Wed, 23 Mar 2022 14:23:25 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mick Lorain <micklorain@...tonmail.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI: Avoid broken MSI on SB600 USB devices

On Wed, Mar 23, 2022 at 1:11 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> On Wed, Mar 23, 2022 at 10:03:38AM +0200, Andy Shevchenko wrote:
> > On Wed, Mar 23, 2022 at 4:26 AM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > > On Mon, Mar 21, 2022 at 01:34:46PM -0500, Bjorn Helgaas wrote:
> > > > From: Bjorn Helgaas <bhelgaas@...gle.com>
> > > >
> > > > Some ATI SB600 USB adapters advertise MSI, but if INTx is disabled by
> > > > setting PCI_COMMAND_INTX_DISABLE,
> >
> > > > MSI doesn't work either.
> >
> > I think this is not correct.
>
> I'd like to make it correct.  What would make this better?

MSI with the quirk (not in this patch) is working and has been tested.
That said, the part that I commented on is confusing and states the
opposite. I would change the patch if you ask me how to improve it,

>  I was
> trying to say the same as your original commit log:
>
>   ATI PCIe-USB adapter advertises MSI, but it doesn't work if INTx is
>   disabled.

I'm not a native speaker, maybe I was wrong in formulating that MSI
enabling needs a quirk.

-- 
With Best Regards,
Andy Shevchenko