On Wed, 8 Apr 2015, Steve Bangert wrote: > What i did was not correct, usb-storage.quirks=174c:55aa:u was added to > /etc/default/grub file after GRUB_CMDLINE_LINUX="rhgb quiet", using > the grub-configurator tool > followed by a reboot and i now have a working usb storage device > using xhci. Here's the usbmon trace and the dmesg log is attached. > > I also found a comment in the source code file (uas-detect.h see > attached) that states that my device, the ASMedia bridge is not > supported by the uas driver. The comment does not say that. It refers to a different model from yours. You can tell because the comment says that the non-working ASM1051 supports 32 streams, whereas your device supports 16. In fact, as far as I can tell, your device _does_ work with the uas driver provided max_sectors isn't too high (i.e., <= 240, which is the default value used by usb-storage). Unfortunately, the uas driver doesn't provide any way to set max_sectors. You can test this by adding a line that says: .max_sectors = 240, anywhere inside the definition of uas_host_template in the uas.c source file. > So my next question is there a way to bind usb-storage to this device > and have a working device out of the box without the hassle of adding > a module parameter? We should ask Hans, since he wrote the comment and code in uas-detect.h and presumably has a better understanding of the situation. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
