linux-kernel - Re: [PATCH v1 1/2] scsi: ufs: add required delay after gating reference clock

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Date:   Mon, 17 Feb 2020 21:12:48 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Can Guo <cang@...eaurora.org>
CC:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>, <beanhuo@...ron.com>,
        <asutoshd@...eaurora.org>, <matthias.bgg@...il.com>,
        <bvanassche@....org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>
Subject: Re: [PATCH v1 1/2] scsi: ufs: add required delay after gating
 reference clock

Hi Can,


> >  			} else if (!on && clki->enabled) {
> >  				clk_disable_unprepare(clki->clk);
> > +				wait_us = hba->dev_info.clk_gating_wait_us;
> > +				if (ref_clk && wait_us)
> > +					usleep_range(wait_us, wait_us + 10);
> 
> Hi Stanley,
> 
> If wait_us is 1us, it would be inappropriate to use usleep_range() here.
> You have checks of the delay in patch #2, but why it is not needed here?
> 
> Thanks,
> Can Guo.

You are right. I could make that delay checking as common function so it
can be used here as well to cover all possible values.

Thanks for suggestion.
Stanley