linux-kernel - RE: [EXT] Re: [PATCH v2 6/9] scsi: ufs: Delete is_init_prefetch from struct ufs

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Message-ID: <BN7PR08MB56848F46B73F3D9DF7E6AD3ADB310@BN7PR08MB5684.namprd08.prod.outlook.com>
Date:   Fri, 17 Jan 2020 13:12:30 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Bart Van Assche <bvanassche@....org>, Bean Huo <huobean@...il.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] Re: [PATCH v2 6/9] scsi: ufs: Delete is_init_prefetch from
 struct ufs_hba

Hi, Bart

> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index 44b7c0a44b8d..31b6e2a7c166 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -6967,8 +6967,7 @@ static int ufs_lu_add(struct ufs_hba *hba)  {
> >  	int ret;
> >
> > -	if (!hba->is_init_prefetch)
> > -		ufshcd_init_icc_levels(hba);
> > +	ufshcd_init_icc_levels(hba);
> >
> >  	/* Add required well known logical units to scsi mid layer */
> >  	ret = ufshcd_scsi_add_wlus(hba);
> > @@ -6994,8 +6993,6 @@ static int ufs_lu_add(struct ufs_hba *hba)
> >  	scsi_scan_host(hba->host);
> >  	pm_runtime_put_sync(hba->dev);
> >
> > -	if (!hba->is_init_prefetch)
> > -		hba->is_init_prefetch = true;
> >  out:
> >  	return ret;
> >  }
> 
> The current code calls ufshcd_init_icc_levels() once per HBA. This patch changes
> that into one call per LUN. It seems like the patch description contradicts the
> code I see above.
> 
No, it is still called once per HBA.  The current UFS driver doesn't have per LU initialization path.
After this patch, the path likes this:

ufshcd_pltfrm_init(pdev, of_id->data);
	ufshcd_init(hba, mmio_base, irq);
		ufshcd_async_scan()
			ufs_lu_add()-->ufshcd_init_icc_levels()
	
I should change ufs_lu_add() name to ufs_lus_add(), will make it clearer.

//Bean