linux-kernel - RE: [PATCH v2 1/1] scsi: ufs: Remove support for old UFSHCI versions

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Date: Wed, 3 Apr 2024 19:24:55 +0000
From: Avri Altman <Avri.Altman@....com>
To: Bart Van Assche <bvanassche@....org>, "James E . J . Bottomley"
	<jejb@...ux.ibm.com>, "Martin K . Petersen" <martin.petersen@...cle.com>
CC: "hch@...radead.org" <hch@...radead.org>, Bean Huo <beanhuo@...ron.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 1/1] scsi: ufs: Remove support for old UFSHCI versions

> On 3/27/24 00:17, Avri Altman wrote:
> > UFS spec version 2.1 was published more than 10 years ago. It is
> > vanishingly unlikely that even there are out there platforms that uses
> > earlier host controllers, let alone that those ancient platforms will
> > ever run a V6.10 kernel.  Thus, remove support of host controllers prior
> > to UFS2.1.
> 
> According to this website, Pixel 1 devices have a UFSHCI 2.0 controller:
> https://www.gsmarena.com/google_pixel-8346.php. There may be other
> smartphones that have a UFSHCI 2.0 controller. Hence, I'm not sure we
> can drop support for UFSHCI 2.0 controllers from the kernel.
Actually the Pixel 1 is an excellent example why we can and should - 
It was announced in 2016, running Android 7 with a v4.4 kernel.
Even if you would be able to find a working specimen of that device - 
It is not realistic it would ever run a 6.10 kernel.

Thanks,
Avri
> 
> Thanks,
> 
> Bart.