linux-kernel - RE: [RESEND PATCH v3] scsi: ufs: exclude UECxx from SFR dump list

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Date:   Mon, 11 Jul 2022 13:01:22 +0900
From:   "Kiwoong Kim" <kwmad.kim@...sung.com>
To:     "'Bart Van Assche'" <bvanassche@....org>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <beanhuo@...ron.com>, <adrian.hunter@...el.com>,
        <sc.suh@...sung.com>, <hy50.seo@...sung.com>,
        <sh425.lee@...sung.com>, <bhoon95.kim@...sung.com>
Subject: RE: [RESEND PATCH v3] scsi: ufs: exclude UECxx from SFR dump list

> >> Is this behavior specific to the Exynos controller or is this
> >> behavior required by the UFSHCI specification? In the latter case,
> >> can you tell me where to find this requirement in the UFSHCI
> >> specification? I haven't found that requirement yet. Maybe this means
> that I overlooked something?
> >
> > This is needed because those SFRs are ROC (Read to Clear) type.
> > That means reading causes clearing contexts.
> > The SFRs are mainly read in interrupt context but the reading is also
> done in dump.
> The above repeats what I can find in the patch description but doesn't
> answer my question :-(
> 
> Bart.

It's definitely not Exynos specific
because the fact that those SFRs are ROC type is written in UFSHCI.
I don't know more things to explain why this patch is needed.

You just want to know whether any additional descriptions about ROC is written ?

Thanks.
Kiwoong Kim