linux-kernel - RE: [EXT] [PATCH v7 3/7] scsi: ufs: introduce common and flexible delay function

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Date:   Wed, 18 Mar 2020 22:10:58 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Stanley Chu <stanley.chu@...iatek.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "martin.peter~sen@...cle.com" <martin.peter~sen@...cle.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "bvanassche@....org" <bvanassche@....org>
CC:     "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuohong.wang@...iatek.com" <kuohong.wang@...iatek.com>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
        "andy.teng@...iatek.com" <andy.teng@...iatek.com>
Subject: RE: [EXT] [PATCH v7 3/7] scsi: ufs: introduce common and flexible
 delay function

Hi, Stanley
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> 314e808b0d4e..a42a84164dec 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -597,6 +597,18 @@ static void ufshcd_print_pwr_info(struct ufs_hba *hba)
>  		 hba->pwr_info.hs_rate);
>  }
> 
> +void ufshcd_delay_us(unsigned long us, unsigned long tolerance) {
> +	if (!us)
> +		return;
> +
> +	if (us < 10)
> +		udelay(us);
> +	else
> +		usleep_range(us, us + tolerance);
> +}
> +EXPORT_SYMBOL_GPL(ufshcd_delay_us);
> +
In this way, the callers of ufshcd_delay_us(), can directly call udelay() or usleep_range(), what is exist meaning of ufshcd_delay_us()?

//Bean