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Subject: RE: [PATCH v4 5/6] scsi: ufshpb: Add handing of device reset HPB
 regions Infos in HPB device mode
Reply-To: daejun7.park@samsung.com
Sender: Daejun Park <daejun7.park@samsung.com>
From:   Daejun Park <daejun7.park@samsung.com>
To:     Bean Huo <huobean@gmail.com>,
        ALIM AKHTAR <alim.akhtar@samsung.com>,
        "avri.altman@wdc.com" <avri.altman@wdc.com>,
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        "martin.petersen@oracle.com" <martin.petersen@oracle.com>,
        "stanley.chu@mediatek.com" <stanley.chu@mediatek.com>,
        "bvanassche@acm.org" <bvanassche@acm.org>,
        "tomas.winkler@intel.com" <tomas.winkler@intel.com>,
        "cang@codeaurora.org" <cang@codeaurora.org>,
        Daejun Park <daejun7.park@samsung.com>,
        "peter.wang@mediatek.com" <peter.wang@mediatek.com>,
        "powen.kao@mediatek.com" <powen.kao@mediatek.com>,
        Keoseong Park <keosung.park@samsung.com>,
        cpgsproxy3 <cpgsproxy3@samsung.com>
CC:     "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Message-ID: <1889248251.21652147883293.JavaMail.epsvc@epcpadp4>
Date:   Tue, 10 May 2022 10:02:55 +0900
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References: <CGME20220505134735epcas2p457a16df1b023585b188cc6fc15f37932@epcms2p3>
Precedence: bulk

Hi=C2=A0Bean=C2=A0Huo,
=C2=A0
>In=C2=A0UFS=C2=A0HPB=C2=A0Spec=C2=A0JESD220-3A,
>=C2=A0
>"5.8.=C2=A0Active=C2=A0and=C2=A0inactive=C2=A0information=C2=A0upon=C2=A0p=
ower=C2=A0cycle
>...
>When=C2=A0the=C2=A0device=C2=A0is=C2=A0powered=C2=A0off=C2=A0by=C2=A0the=
=C2=A0host,=C2=A0the=C2=A0device=C2=A0may=C2=A0restore=C2=A0L2P=C2=A0map=C2=
=A0data
>upon=C2=A0power=C2=A0up=C2=A0or=C2=A0build=C2=A0from=C2=A0the=C2=A0host=E2=
=80=99s=C2=A0HPB=C2=A0READ=C2=A0command.=C2=A0In=C2=A0case=C2=A0device=C2=
=A0powered
>up=C2=A0and=C2=A0lost=C2=A0HPB=C2=A0information,=C2=A0device=C2=A0can=C2=
=A0signal=C2=A0to=C2=A0the=C2=A0host=C2=A0through=C2=A0HPB=C2=A0Sense=C2=A0=
data,
>by=C2=A0setting=C2=A0HPB=C2=A0Operation=C2=A0as=C2=A0=E2=80=982=E2=80=99=
=C2=A0which=C2=A0will=C2=A0inform=C2=A0the=C2=A0host=C2=A0that=C2=A0device=
=C2=A0reset=C2=A0HPB
>information."
>=C2=A0
>Therefore,=C2=A0for=C2=A0HPB=C2=A0device=C2=A0control=C2=A0mode,=C2=A0if=
=C2=A0the=C2=A0UFS=C2=A0device=C2=A0is=C2=A0reset=C2=A0via=C2=A0the=C2=A0RS=
T_N
>pin,=C2=A0the=C2=A0active=C2=A0region=C2=A0information=C2=A0in=C2=A0the=C2=
=A0device=C2=A0will=C2=A0be=C2=A0reset.=C2=A0If=C2=A0the=C2=A0host=C2=A0sid=
e
>receives=C2=A0this=C2=A0notification=C2=A0from=C2=A0the=C2=A0device=C2=A0s=
ide,=C2=A0it=C2=A0is=C2=A0recommended=C2=A0to=C2=A0inactivate
>all=C2=A0active=C2=A0regions=C2=A0in=C2=A0the=C2=A0host's=C2=A0HPB=C2=A0ca=
che.
>=C2=A0
>Signed-off-by:=C2=A0Bean=C2=A0Huo=C2=A0<beanhuo@micron.com>
>Reviewed-by:=C2=A0Keoseong=C2=A0Park=C2=A0<keosung.park@samsung.com>
=C2=A0
Here=C2=A0is=C2=A0my=C2=A0reviewed-by=C2=A0tag.
Reviewed-by:=C2=A0Daejun=C2=A0Park=C2=A0<daejun7.park@samsung.com>
=C2=A0
Thanks,
Daejun
=C2=A0