linux-kernel - RE: [PATCH v1] scsi: ufs: change msleep to usleep

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Date:   Tue, 16 Jul 2019 06:54:50 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "Bean Huo (beanhuo)" <beanhuo@...ron.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Evan Green <evgreen@...omium.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH v1] scsi: ufs: change msleep to usleep_range

> 
> From: Bean Huo <beanhuo@...ron.com>
> 
> This patch is to change msleep() to usleep_range() based on
> Documentation/timers/timers-howto.txt. It suggests using
> usleep_range() for small msec(1ms - 20ms) since msleep()
> will often sleep longer than desired value.
> 
> After changing, booting time will be 5ms-10ms faster than before.
> I tested this change on two different platforms, one has 5ms faster,
> another one is about 10ms. I think this is different on different
> platform.
> 
> Actually, from UFS host side, 1ms-5ms delay is already sufficient for
> its initialization of the local UIC layer.
> 
> Fixes: 7a3e97b0dc4b ([SCSI] ufshcd: UFS Host controller driver)
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Avri Altman <avri.altman@....com>