linux-kernel - Re: [PATCH v7 3/3] i2c: aspeed: Assert NAK when slave is busy

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Message-ID: <Yn+9QBoPdH8fMm/m@shikoro>
Date:   Sat, 14 May 2022 16:31:28 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Quan Nguyen <quan@...amperecomputing.com>
Cc:     Corey Minyard <minyard@....org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        openipmi-developer@...ts.sourceforge.net,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, openbmc@...ts.ozlabs.org,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v7 3/3] i2c: aspeed: Assert NAK when slave is busy

On Fri, Apr 22, 2022 at 11:08:03AM +0700, Quan Nguyen wrote:
> When processing I2C_SLAVE_WRITE_REQUESTED event, if slave returns
> -EBUSY, i2c controller should issue RxCmdLast command to assert NAK
> on the bus.

That should be I2C_SLAVE_WRITE_RECEIVED and it should be NAKed on all
errnos. Have you tested it?


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