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

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Message-ID: <DM6PR04MB6575C233D314AF011D5008C0FC84A@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Wed, 6 Dec 2023 19:38:26 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <beanhuo@...pp.de>,
        "bvanassche@....org" <bvanassche@....org>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "mani@...nel.org" <mani@...nel.org>,
        "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
        "quic_asutoshd@...cinc.com" <quic_asutoshd@...cinc.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "thomas@...ch.de" <thomas@...ch.de>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mikebi@...ron.com" <mikebi@...ron.com>,
        "lporzio@...ron.com" <lporzio@...ron.com>
Subject: RE: [PATCH v3 2/3] scsi: ufs: core: Add UFS RTC support

> From: Bean Huo <beanhuo@...ron.com>
> 
> Add Real Time Clock (RTC) support for UFS device. This enhancement is
> crucial for the internal maintenance operations of the UFS device. The patch
> enables the device to handle both absolute and relative time information.
> Furthermore, it includes periodic task to update the RTC in accordance with
> the UFS Spec, ensuring the accuracy of RTC information for the device's
> internal processes.
> 
> RTC and qTimestamp serve distinct purposes. The RTC provides a coarse
> level of granularity with, at best, approximate single-second resolution. This
> makes the RTC well-suited for the device to determine the approximate age
> of programmed blocks after being updated by the host. On the other hand,
> qTimestamp offers nanosecond granularity and is specifically designed for
> synchronizing Device Error Log entries with corresponding host-side logs.
> 
> Given that the RTC has been a standard feature since UFS Spec 2.0, and
> qTimestamp was introduced in UFS Spec 4.0, the majority of UFS devices
> currently on the market rely on RTC. Therefore, it is advisable to continue
> supporting RTC in the Linux kernel. This ensures compatibility with the
> prevailing UFS device implementations and facilitates seamless integration
> with existing hardware.
> By maintaining support for RTC, we ensure broad compatibility and avoid
> potential issues arising from deviations in device specifications across
> different UFS versions.
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> Signed-off-by: Mike Bi <mikebi@...ron.com>
> Signed-off-by: Luca Porzio <lporzio@...ron.com>
Acked-by: Avri Altman <avri.altman@....com>