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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Tue, 2 Nov 2021 09:10:50 +0100
Message-ID: <CAK8P3a2N3zNkGzXQD8Pbs-8pDL7mv6rneJop-C_p_+d7-_sNqA@mail.gmail.com>
Subject: Re: [PATCH 11/13] arm: npcm: drop selecting non-existing ARM_ERRATA_794072
To:     Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc:     Joel Stanley <joel@jms.id.au>, Arnd Bergmann <arnd@arndb.de>,
        Tomer Maimon <tmaimon77@gmail.com>,
        Avi Fishman <avifishman70@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        Sekhar Nori <nsekhar@ti.com>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Linus Walleij <linusw@kernel.org>,
        Imre Kaloz <kaloz@openwrt.org>,
        Krzysztof Halasa <khalasa@piap.pl>,
        Tali Perry <tali.perry1@gmail.com>,
        Patrick Venture <venture@google.com>,
        Nancy Yuen <yuenn@google.com>,
        Benjamin Fair <benjaminfair@google.com>,
        Dinh Nguyen <dinguyen@kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        OpenBMC Maillist <openbmc@lists.ozlabs.org>,
        kernel-janitors <kernel-janitors@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Precedence: bulk

On Tue, Nov 2, 2021 at 8:31 AM Lukas Bulwahn <lukas.bulwahn@gmail.com> wrote:
> On Fri, Oct 29, 2021 at 8:36 AM Joel Stanley <joel@jms.id.au> wrote:
> > On Thu, 28 Oct 2021 at 14:57, Arnd Bergmann <arnd@arndb.de> wrote:
> > > On Thu, Oct 28, 2021 at 4:19 PM Lukas Bulwahn <lukas.bulwahn@gmail.com> wrote:
> > https://lore.kernel.org/all/6be32e0b5b454ed7b609317266a8e798@BLUPR03MB358.namprd03.prod.outlook.com/
> >
> > It looks like it's the same workaround as ARM_ERRATA_742230, which the
> > kernel does implement.
> >
> > It would be good to hear from the Nuvoton people, or an Arm person.
>
> I will happily update the patch to select ARM_ERRATA_742230 instead of
> the dead non-existing ARM_ERRATA_794072.
>
> In contrast to the current patch that basically only cleans up "dead
> config" and has no effective functional change, the new patch would
> change the behaviour. I cannot test this patch (beyond some basic
> compile test) on the hardware; so, we certainly need someone to have
> that hardware, knows how to test it or confirm otherwise that we
> should select the ARM_ERRATA_742230 fix for this hardware.
>
> The current patch should be subsumed by the new patch; the submission
> of the new patch is deferred until that person shows up. Let's see.

I'd prefer to leave the broken Kconfig symbol in place as a reminder until it
gets fixed properly then.

       Arnd