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From: Avri Altman <Avri.Altman@wdc.com>
To: Can Guo <cang@codeaurora.org>,
	"asutoshd@codeaurora.org" <asutoshd@codeaurora.org>,
	"nguyenb@codeaurora.org" <nguyenb@codeaurora.org>,
	"hongwus@codeaurora.org" <hongwus@codeaurora.org>,
	"rnayak@codeaurora.org" <rnayak@codeaurora.org>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"kernel-team@android.com" <kernel-team@android.com>,
	"saravanak@google.com" <saravanak@google.com>,
	"salyzyn@google.com" <salyzyn@google.com>
Cc: Alim Akhtar <alim.akhtar@samsung.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Bean Huo <beanhuo@micron.com>,
	Stanley Chu <stanley.chu@mediatek.com>,
	Bart Van Assche <bvanassche@acm.org>,
	Venkat Gopalakrishnan <venkatg@codeaurora.org>,
	Tomas Winkler <tomas.winkler@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Pedro Sousa <sousa@synopsys.com>,
	open list <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v7 8/8] scsi: ufs: Select INITIAL adapt for HS Gear4
Date: Thu, 6 Feb 2020 13:20:07 +0000	[thread overview]
Message-ID: <MN2PR04MB6991EA027BB31FA58EEBDA81FC1D0@MN2PR04MB6991.namprd04.prod.outlook.com> (raw)
In-Reply-To: <1580978008-9327-9-git-send-email-cang@codeaurora.org>

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

  reply	other threads:[~2020-02-06 13:20 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-06  8:33 [PATCH v7 0/8] UFS driver general fixes bundle 4 Can Guo
2020-02-06  8:33 ` [PATCH v7 1/8] scsi: ufs: Flush exception event before suspend Can Guo
2020-02-06  8:33 ` [PATCH v7 2/8] scsi: ufs: set load before setting voltage in regulators Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33 ` [PATCH v7 3/8] scsi: ufs: Remove the check before call setup clock notify vops Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33 ` [PATCH v7 4/8] scsi: ufs-qcom: Adjust bus bandwidth voting and unvoting Can Guo
2020-02-06  8:33 ` [PATCH v7 5/8] scsi: ufs: Fix ufshcd_hold() caused scheduling while atomic Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06 10:28   ` Avri Altman
2020-02-06 10:28     ` Avri Altman
2020-02-06 10:28     ` Avri Altman
2020-02-10  1:28     ` Can Guo
2020-02-10  1:28       ` Can Guo
2020-02-10  1:28       ` Can Guo
2020-02-10  1:59       ` Can Guo
2020-02-10  1:59         ` Can Guo
2020-02-10  1:59         ` Can Guo
2020-02-10  8:23         ` Avri Altman
2020-02-10  8:23           ` Avri Altman
2020-02-10  8:23           ` Avri Altman
2020-02-06  8:33 ` [PATCH v7 6/8] scsi: ufs: Add dev ref clock gating wait time support Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33   ` Can Guo
2020-02-06  8:33 ` [PATCH v7 7/8] scsi: ufs-qcom: Delay specific time before gate ref clk Can Guo
2020-02-06 20:33   ` Bjorn Andersson
2020-02-07  1:09     ` Can Guo
2020-02-07  2:10       ` Bjorn Andersson
2020-02-08  0:10         ` Can Guo
2020-02-06  8:33 ` [PATCH v7 8/8] scsi: ufs: Select INITIAL adapt for HS Gear4 Can Guo
2020-02-06 13:20   ` Avri Altman [this message]
2020-02-07  2:56     ` Can Guo
2020-02-07  5:10       ` Can Guo

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