linux-kernel - Re: [PATCH] mmc: block: Differentiate busy and non-TRAN state

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Message-ID: <CWXP265MB268016982B4DEE728E60AC45C41A9@CWXP265MB2680.GBRP265.PROD.OUTLOOK.COM>
Date:   Wed, 7 Jul 2021 14:42:57 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     Avri Altman <Avri.Altman@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>
Subject: Re: [PATCH] mmc: block: Differentiate busy and non-TRAN state

>> CMD16 - CMD42 Set PW - (CMD16)* - CMD42 Unlock Force Erase - (CMD42
>> Set PW)+
>> * May be omitted if you craft the CMD42 carefully (i.e. equal data size)
>> + is pretty much irrelevant, can be replaced with anything that is illegal in
>> PROG.
>Oh, OK.  Interesting.
>This functionality is missing in mmc-utils.
>While at it, I encourage you to consider adding it.
>
>Thanks,
>Avri

That is true and I have thought about it. Unfortunately a locked card currently will not initalize, so not be open to the ioctl interface.
So in fear of doing more harm than good I would first change that.
(One thing is reading of SCR is required by linux-mmc but locked cards must not respond to it).
Something I'm working on on the side but don't expect anything very soon.

Kind Regards,
Christian

> 
> >Again, can you share the sequence of the commands you are using?
> >
> >Thanks,
> >Avri
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