linux-kernel - Re: [PATCH v3 2/3] scsi: ufs: core: Add UFS RTC support

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Message-ID: <887dec18bdaec3cc048f0f4d5c0391dc338e3828.camel@iokpp.de>
Date:   Fri, 08 Dec 2023 00:02:33 +0100
From:   Bean Huo <beanhuo@...pp.de>
To:     Bart Van Assche <bvanassche@....org>, avri.altman@....com,
        alim.akhtar@...sung.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, mani@...nel.org, quic_cang@...cinc.com,
        quic_asutoshd@...cinc.com, beanhuo@...ron.com, thomas@...ch.de
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        mikebi@...ron.com, lporzio@...ron.com
Subject: Re: [PATCH v3 2/3] scsi: ufs: core: Add UFS RTC support

On Wed, 2023-12-06 at 14:59 -1000, Bart Van Assche wrote:
> A 64-bit value is truncated to a 32-bit value. What should happen if
> the
> right hand side is larger than what fits into a 32-bit integer?
> Should
> a comment perhaps be added that uptimes of more than 136 years are
> not
> supported and also for absolute times that the above code fails after
> the year 2010 + 136 = 2146?
> 
> Thanks,
> 
> Bart.


Bart,

you are taking into account a broader perspective. thanks for your
review!

I will add below code in the next version:


+       if  (ts64.tv_sec < hba->dev_info.rtc_time_baseline) {
+               dev_warn(hba->dev, "%s: Current time precedes previous
setting!\n", __func__);
+               return;
+       }
+       /*
+        * Absolute RTC mode has 136-year limit as of 2010. Modify UFS
Spec or choosing relative
+        * RTC mode for longer (beyond year 2146) time spans.
+        */


Kind regards,
Bean