Hi,
When trying to migrate a board from u-boot version 2016.09 to version
2018.03, I found a problem with a USB 2.0 device which used to work on
version 2016.09.
In u-boot version 2016.09 the device appears like this:
2: Mass Storage, USB Revision 2.0
- SanDisk Cruzer Blade 200443243002FB509E64
- Class: (from Interface) Mass Storage
- PacketSize: 64 Configurations: 1
- Vendor: 0x0781 Product 0x5567 Version 1.38
Configuration: 1
- Interfaces: 1 Bus Powered 200mA
Interface: 0
- Alternate Setting 0, Endpoints: 2
- Class Mass Storage, Transp. SCSI, Bulk only
- Endpoint 1 In Bulk MaxPacket 512
- Endpoint 2 Out Bulk MaxPacket 512
But in version 2018.03 I just can't start usb. It fails with following
error:
=> usb start
starting USB...
USB0: USB EHCI 1.00
scanning bus 0 for devices... EHCI timed out on TD - token=0x80008c80
unable to get device descriptor (error=-1)
1 USB Device(s) found
USB1: USB EHCI 1.00
scanning bus 1 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
I did a "git bisect" and found that this problem is related to the
following commit:
c008faa usb: Only get 64 bytes device descriptor for full speed devices
I am not an expert on USB, so I would like to ask for help on this issue.
In u-boot v2018.03, file common/usb.c, line 973, shouldn't the
comparison be like this:
if (do_read && dev->speed >= USB_SPEED_FULL) {
or, at list:
if (do_read && (dev->speed == USB_SPEED_FULL || dev->speed ==
USB_SPEED_HIGH)) {
I would submit a patch for this, but I lack on USB knowledge for
explaining the patch.
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