linux-kernel - Re: [PATCH v2] usb: storage: Ignore UAS driver for SanDisk Extreme Pro 55AF storage device

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Message-ID: <2025070810-nintendo-congenial-95d4@gregkh>
Date: Tue, 8 Jul 2025 09:33:18 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Jie Deng <dengjie03@...inos.cn>
Cc: stern@...land.harvard.edu, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net
Subject: Re: [PATCH v2] usb: storage: Ignore UAS driver for SanDisk Extreme
 Pro 55AF storage device

On Tue, Jul 08, 2025 at 01:55:47PM +0800, Jie Deng wrote:
> 2. Regarding your question, before submitting the patch,
> I conducted the following tests:
> 1) linux + x86: The SanDisk Extreme Pro 55AF device can be recognized
> normally when using the uas driver. USB controller model (VendorID:
> 1D94, DeviceID: 145F,Chengdu Haiguang IC Design Co., Ltd.USB 3.0 Host
> controller)

So it all works, great!

> 2) linux + arm64: The SanDisk Extreme Pro 55AF device will report an error
> when
> using the uas driver and the driver cannot be loaded. USB Controller model
> (Vendor ID: 1912, Device ID: 0014,uPD720201 USB 3.0 Host Controller).

Ok, that sounds like an arm64 issue we should resolve.  Why can the
driver not be loaded at all?  What happens?

> 3) linux + arm64: Add the parameter "USB-storage.quirks =0781:55af:u" in
> grub.
> The SanDisk Extreme Pro 55AF device runs the usb storage driver without any
> error
> and can be recognized normally.

Let's track down and fix the arm64 issue here please, and not paper over
it by saying that this whole device will not work well on all arches.

thakns,

greg k-h