Re: [U-Boot] [PATCH 07/16] usb: hub: Translate USB 3.0 hub port status into old version

On 06/24/2017 03:53 AM, Bin Meng wrote:

Hi Marek,

On Sat, Jun 24, 2017 at 1:59 AM, Marek Vasut marex@denx.de wrote:

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On 06/23/2017 11:54 AM, Bin Meng wrote:

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USB 3.0 hub port status field has different bit positions from 2.0 hubs. Since U-Boot only understands the old version, translate the new one into the old one.

This is quite hairy. I'd rather see some protocol version agnostic flag field rather than patching the wPortStatus and co.

I am not sure how do do that in a clean way. If we return the raw 3.0 hub port status data, that means we need change lot of hub codes here and there to do different parsing.

How does Linux handle this?