linux-kernel - Re: [PATCH v7 06/13] slimbus: Add messaging APIs to slimbus framework

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Message-ID: <ae307430-c1ec-0e2f-ea6a-aae9e0f773d2@linaro.org>
Date:   Tue, 28 Nov 2017 07:18:22 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, sdharia@...eaurora.org, bp@...e.de,
        poeschel@...onage.de, treding@...dia.com, andreas.noever@...il.com,
        alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
        jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
        davem@...emloft.net, james.hogan@...tec.com,
        michael.opdenacker@...e-electrons.com, robh+dt@...nel.org,
        pawel.moll@....com, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH v7 06/13] slimbus: Add messaging APIs to slimbus framework



On 27/11/17 05:56, Vinod Koul wrote:
> On Mon, Nov 20, 2017 at 06:47:52AM +0000, Srinivas Kandagatla wrote:
> 
>>>> + *	-ENOTCONN: If the transmitted message was not ACKed by destination
>>>> + *	device.
>>>
>>> I am preferring ENODATA in SDW for this case, as Slaves didnt respond or
>>> ACK.
>> Isn't that a timeout error then.
>>
>> ENODATA is for "No data available", reporting ENODATA would be misleading.
> 
> Do you get a explict NACK or no response for this

There is no response for the request, currently code waits for it arrive 
and then timesout on completion.