linux-kernel - RE: [PATCH v7 8/8] scsi: ufs: Select INITIAL adapt for HS Gear4

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Date:   Thu, 6 Feb 2020 13:20:07 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "hongwus@...eaurora.org" <hongwus@...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>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bean Huo <beanhuo@...ron.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bart Van Assche <bvanassche@....org>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Pedro Sousa <sousa@...opsys.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v7 8/8] scsi: ufs: Select INITIAL adapt for HS Gear4

Hi Can,

 
> ADAPT is added specifically for HS Gear4 mode only, select INITIAL adapt
> before do power mode change to G4 and select no adapt before switch to
> non-G4 modes.

UFSHCI 3.0 says:
7.4.1 Adapt
The use of Adapt isn't mandatory but the specification provides some guidelines on its use.
The HCI should perform an Initial Adapt in the following cases if the link is running at HS-G4
speed:
 - If DME_RESET is initiated.
 - If an unused line is activated for HS-G4.
 - If UECDME.EC is triggered with bit 3 set to '1'.
 - If a change between Rate A and Rate B in HS-G4 is performed.

If it's not mandatory - why are we setting this for all vendors on all platforms?
Or am I miss-reading the spec?

Thanks,
Avri