Re: UAS peripheral with unrecognized TRIM support

[Greg KH <gregkh@linuxfoundation.org>]

On Sat, Mar 28, 2026 at 05:23:48PM +0100, Johan Gill wrote:
> Hi, I have tested running Linux on the StarTech USB312SAT3CB USB 3.1 -> SATA
> adapter. It's a more stable UAS implementation than my previous adapter but
> the device is not recognized as supporting TRIM out of the box (kernel
> 6.19.9). The technical specifications at
> https://www.startech.com/en-se/hdd/usb312sat3cb indicate that TRIM is
> supported, so I enabled it by setting ATTR{provisioning_mode}="unmap" in a
> udev rule and then fstrim indeed seems to work when I run it. The
> specification claims that it uses ASMedia ASM235CM, but the device uses the
> StarTech vendor id and identifies as 14b0:0207.
> 
> It would be nice to have the adapter recognized as more capable out of the
> box. Should I aim at patching drivers/usb/storage/unusual_uas.h?

Isn't that a scsi issue, not a USB/UAS issue to be reporting that value
properly?  That sysfs attribute comes from the storage portion of the
kernel, not the USB portion.

thanks,

greg k-h