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From:   "Bean Huo (beanhuo)" <beanhuo@micron.com>
To:     Stanley Chu <stanley.chu@mediatek.com>,
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Subject: RE: [EXT] [PATCH v7 3/7] scsi: ufs: introduce common and flexible
 delay function
Thread-Topic: [EXT] [PATCH v7 3/7] scsi: ufs: introduce common and flexible
 delay function
Thread-Index: AQHV/RGnPsqiA4EvtEeou0tltjIAGahO6EyQ
Date:   Wed, 18 Mar 2020 22:10:58 +0000
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References: <20200318104016.28049-1-stanley.chu@mediatek.com>
 <20200318104016.28049-4-stanley.chu@mediatek.com>
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Hi, Stanley
>=20
> 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 *hb=
a)
>  		 hba->pwr_info.hs_rate);
>  }
>=20
> +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() o=
r usleep_range(), what is exist meaning of ufshcd_delay_us()?

//Bean