linux-kernel - RE: [PATCH v4 4/5] scsi: ufs: Do not clear the DL layer timers

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Date:   Mon, 2 Dec 2019 07:42:00 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "cang@...eaurora.org" <cang@...eaurora.org>
CC:     "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <Avri.Altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 4/5] scsi: ufs: Do not clear the DL layer timers


> During power mode change, PACP_PWR_Req frame sends
> PAPowerModeUserData parameters (and they are considered valid by device if
> Flags[4] - UserDataValid bit is set in the same frame).
> Currently we don't set these PAPowerModeUserData parameters and hardware
> always sets UserDataValid bit which would clear all the DL layer timeout values
> of the peer device after the power mode change.
> 
> This change sets the PAPowerModeUserData[0..5] to UniPro specification
> recommended default values, in addition we are also setting the relevant
> DME_LOCAL_* timer attributes as required by UFS HCI specification.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
Reviewed-by: Avri Altman <avri.altman@....com>