linux-kernel - Re: [PATCH v5 3/3] i2c-ocores: sifive: add polling mode workaround for FU540-C000 SoC.

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Message-ID: <CAARK3Hn4-amRV-knDa5UR8J68DKxWaBnC3O98KvciNpbwbsAGA@mail.gmail.com>
Date:   Tue, 21 May 2019 14:27:54 +0530
From:   Sagar Kadam <sagar.kadam@...ive.com>
To:     Andreas Schwab <schwab@...e.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, peter@...sgaard.com,
        Andrew Lunn <andrew@...n.ch>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] i2c-ocores: sifive: add polling mode workaround
 for FU540-C000 SoC.

Thanks Andreas,
Yes, I rebased to v5.2-rc1 and observed that there have been changes
in polling interface, and i2c->flags is not longer being used for
setting the polling mode. I am working on a way to hook in the fix for
broken IRQ and will submit it in v6.

Thanks & BR,
Sagar Kadam

On Tue, May 21, 2019 at 2:03 PM Andreas Schwab <schwab@...e.de> wrote:
>
> On Mai 20 2019, Sagar Shrikant Kadam <sagar.kadam@...ive.com> wrote:
>
> > The i2c-ocore driver already has a polling mode interface.But it needs
> > a workaround for FU540 Chipset on HiFive unleashed board (RevA00).
> > There is an erratum in FU540 chip that prevents interrupt driven i2c
> > transfers from working, and also the I2C controller's interrupt bit
> > cannot be cleared if set, due to this the existing i2c polling mode
> > interface added in mainline earlier doesn't work, and CPU stall's
> > infinitely, when-ever i2c transfer is initiated.
> >
> > Ref:previous polling mode support in mainline
> >
> >       commit 69c8c0c0efa8 ("i2c: ocores: add polling interface")
> >
> > The workaround / fix under OCORES_FLAG_BROKEN_IRQ is particularly for
> > FU540-COOO SoC.
>
> After commit dd7dbf0eb090 this no longer fits.
>
> Andreas.
>
> --
> Andreas Schwab, SUSE Labs, schwab@...e.de
> GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
> "And now for something completely different."