linux-kernel - RE: [PATCH v6 2/3] scsi: ufs: Maximum RTT supported by the host driver

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Message-ID:
 <DM6PR04MB6575E8CF999266A049F7F077FCF22@DM6PR04MB6575.namprd04.prod.outlook.com>
Date: Wed, 29 May 2024 21:07:51 +0000
From: Avri Altman <Avri.Altman@....com>
To: Bart Van Assche <bvanassche@....org>, "Martin K . Petersen"
	<martin.petersen@...cle.com>
CC: Bean Huo <beanhuo@...ron.com>, Peter Wang <peter.wang@...iatek.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 2/3] scsi: ufs: Maximum RTT supported by the host
 driver

> 
> On 5/26/24 01:16, Avri Altman wrote:
> > -     rtt = min_t(int, dev_info->rtt_cap, hba->nortt);
> > +     if (hba->vops && hba->vops->max_num_rtt)
> > +             rtt = hba->vops->max_num_rtt;
> > +     else
> > +             rtt = min_t(int, dev_info->rtt_cap, hba->nortt);
> > +
> 
> Shouldn't what the controller supports be compared with what the device
> supports, e.g. as follows?
> 
> min_t(int, dev_info->rtt_cap, hba->vops->max_num_rtt ? : hba->nortt);
Yes, this is an option too.
The one that I proposed allows to entirely overrides the negotiation.
I think your suggestion is better.
Will change.

> 
> >   struct ufs_hba_variant_ops {
> >       const char *name;
> > +     int     max_num_rtt;
> 
> Hmm ... why 'int' instead of an unsigned type? If the type would be changed
> into 'u8' (the type of rtt_cap) then the above min_t() can be changed into
> min().
Nortt is 0 based, meaning it can be 256, which some of the platforms in the market do use,  so u8 is not enough.

Thanks,
Avri

> 
> Thanks,
> 
> Bart.