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

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Date: Wed, 3 Apr 2024 14:17:49 -0700
From: Bart Van Assche <bvanassche@....org>
To: Avri Altman <Avri.Altman@....com>,
 "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 4/3/24 12:24, Avri Altman wrote:
>> 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.

v4.4 is the kernel version of the kernel included in the original
software. Multiple users of older smartphones switch to alternative
distributions once their device is no longer supported by the
manufacturer. These alternatives often include a more recent kernel.
See e.g. https://en.wikipedia.org/wiki/List_of_custom_Android_distributions.

Thanks,

Bart.