Re: [PATCH] usb: hub: try old enumeration scheme first for high speed devices

[Alan Stern]

On Fri, 10 Aug 2018, Roger Quadros wrote:

> Hi,
> 
> On 10/08/18 18:01, Zeng Tao wrote:
> > The new scheme is required just to support legacy low and full-speed
> > devices. For high speed devices, it will slower the enumeration speed.
> > So in this patch we try the "old" enumeration scheme first for high speed
> > devices.
> 
> How slow does it get? Is it significant?
> Do we risk breaking existing HS devices that work? I don't think we can
> be sure till we run this through testing.

Indeed.  I am extremely skeptical about a patch like this, unless
somebody can show that Windows uses the "old" scheme for high-speed 
devices.

Alan Stern