linux-kernel - Re: [PATCH v5 2/8] scsi: ufs: set load before setting voltage in regulators

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Message-ID: <1580796963.21785.1.camel@mtksdccf07>
Date:   Tue, 4 Feb 2020 14:16:03 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Can Guo <cang@...eaurora.org>
CC:     <asutoshd@...eaurora.org>, <nguyenb@...eaurora.org>,
        <hongwus@...eaurora.org>, <rnayak@...eaurora.org>,
        <linux-scsi@...r.kernel.org>, <kernel-team@...roid.com>,
        <saravanak@...gle.com>, <salyzyn@...gle.com>,
        "Alim Akhtar" <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bean Huo <beanhuo@...ron.com>,
        "Bart Van Assche" <bvanassche@....org>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        "open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/8] scsi: ufs: set load before setting voltage in
 regulators

On Mon, 2020-02-03 at 01:17 -0800, Can Guo wrote:
> From: Asutosh Das <asutoshd@...eaurora.org>
> 
> This sequence change is required to avoid dips in voltage
> during boot-up.
> 
> Apparently, this dip is caused because in the original
> sequence, the regulators are initialized in lpm mode.
> And then when the load is set to high, and more current
> is drawn, than is allowed in lpm, the dip is seen.
> 
> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
> Signed-off-by: Can Guo <cang@...eaurora.org>
> Reviewed-by: Hongwu Su <hongwus@...eaurora.org>

Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>