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

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Message-ID: <mvm7eakjjf7.fsf@suse.de>
Date:   Tue, 21 May 2019 10:33:48 +0200
From:   Andreas Schwab <schwab@...e.de>
To:     Sagar Shrikant Kadam <sagar.kadam@...ive.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, peter@...sgaard.com,
        andrew@...n.ch, palmer@...ive.com, paul.walmsley@...ive.com,
        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.

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
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