On 16.06.2017 16:21, Marek Vasut wrote:
On 06/16/2017 03:31 PM, Bin Meng wrote:
Currently U-Boot xHCI driver does not work on Intel BayTrail SoC based
boards that have USB 3.0 ports. Trying to do a 'usb start' simply hangs
the board. This series fixes a bunch of xHCI driver issues to make it
work on Intel's platform.
Issues identified in the U-Boot xHCI driver are really spec violations,
but apparently other xHCI IPs found on ARM SoCs (mainly Synopsis IP?)
are quite tolerant with these spec violations, or IOW those IPs don't
respect the xHCI spec. While it comes to Intel platform, it just breaks.
Note xHCI interrupt transfer is still not supported in this series, as
it has been there since the original commit of xHCI support for years.
Tested on Intel MinnowMax board with the following USB devices:
- Dell USB 1.1 keyboard
- Dell USB 2.0 mouse
- Netac USB 2.0 flash disk
- JetFlash USB 3.0 flash disk
- GenesysLogic 4-port USB 3.0 hub, with an integrated Realtek USB
ethernet chipset connected to one of its downstream port
Testing were performed on both ports (2.0 port and 3.0 port), and both
ports are connected to xHCI (configure MinnowMax to enable xHCI).
Testing results:
- DELL USB 1.1 keyboard and 2.0 mouse can be enumerated on both ports
- USB 2.0 and 3.0 flash disks work fine (enumerated, read/write) on
both ports
- GenesysLogic USB 3.0 hub can be enumerated on 2.0 port as a 2.0 hub,
and the integrated Realtek USB ethernet chipset enumerated as well.
USB 2.0 and 3.0 flash disks connected via the hub can be enumerated,
but DELL USB 1.1 keyboard and 2.0 mouse cannot.
- GenesysLogic USB 3.0 hub can be enumerated on 3.0 port as a 3.0 hub,
but the integrated Realtek USB ethernet chipset cannot be enumerated.
None of devices connected via the hub can be enumerated. U-Boot xHCI
driver just throws BUG_ON() on the event TRB handling.
This indicates that USB 3.0 hub support in U-Boot is seriously broken.
So far this series tries to fix some of the issues identified, but the
USB 3.0 hub is still not working. This will be left as future work, or
if someone else is interested it to pick up the work.
The USB 3.0 hub work includes: port status translation, USB 3.0 newly
added "Set Hub Depth" request support, xHCI codes update to fill in
hub description fields in the input slot context when issuing commands
to xHC, etc.
Bin, thanks for working on this.
I'd like Stefan to review this series as he worked on the intel stuff
recently too.
Yes, I'll review and test this series most likely beginning of next
week.
Thanks,
Stefan
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