Re: [RFC PATCH] USB:XHCI:Modify XHCI driver for USB2.0 controller

liulongfang
2021-02-27T03:49:24Z

On 2021/2/27 11:38, liulongfang wrote:
> On 2021/2/27 0:30, Alan Stern wrote:
>> On Fri, Feb 26, 2021 at 04:21:37PM +0800, Longfang Liu wrote:
>>> Our current XHCI hardware controller has been customized to only
>>> support USB 2.0 ports. When using the current xhci driver, an xhci
>>> controller device and an ehci controller device will be created
>>> automatically.
>>
>> That sentence makes no sense at all. An EHCI controller device is a
>> piece of hardware. How can an xHCI driver, which is a piece of
>> software, create a piece of hardware?
>>
>> Alan Stern
>> .
>>
> The hardware device is a complete USB3.0 controller,
On the hardware, only the hardware connection of the USB2.0 port has been opened
> but I hope to support a USB2.0-only mode through software configuration.
> Thanks.
> Longfang Liu
> .
>
Thanks.
Longfang Liu