Re: [RFC PATCH] USB:XHCI:Modify XHCI driver for USB2.0 controller
From: liulongfang <liulongfang@huawei.com>
Date: 2021-03-04 04:10:31
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On 2021/3/4 9:35, Peter Chen wrote:
On 21-02-27 11:31:00, liulongfang wrote:quoted
On 2021/2/26 16:38, Greg KH wrote:quoted
On Fri, Feb 26, 2021 at 04:21:37PM +0800, Longfang Liu wrote:quoted
Our current XHCI hardware controller has been customized to only support USB 2.0 ports.That sounds like a spec violation, right? Why do you want to do this? greg k-h .I hope to support a USB2.0-only mode on the XHCI controller through software configuration. Thanks.If your hardware has disabled USB3 logic, when the USB3 device is plugged, since there are no RX signal on the bus, the device will not enable USB3 logic, and only USB2 signals will be on the bus, there are only USB devices on USB2 roothub later. So, any issues you have met?
I don’t want to see the USB3 bus controller in the system, but it actually exists. Thanks. Longfang, Liu