linux-kernel - USB EHCI chipidea regression on NXP i.MX7

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Message-ID: <20250108093101.GA22448@francesco-nb>
Date: Wed, 8 Jan 2025 10:31:01 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: linux-usb@...r.kernel.org, Xu Yang <xu.yang_2@....com>,
	Peter Chen <peter.chen@...nel.org>
Cc: Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, ritesh.kumar@...adex.com
Subject: USB EHCI chipidea regression on NXP i.MX7

Hello Xu Yang and all,
commit dda4b60ed70b ("usb: ehci: add workaround for chipidea PORTSC.PEC bug")
introduced a regression on NXP i.MX7 SoC.

If the USB port is connected to a USB HUB, and a device is connected at
boot time to such a hub, the following errors are printed and the USB
port is not functional.

[    1.131847] usbhid: USB HID core driver
[    9.471549] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
[    9.516311] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[    9.516697] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.06
[    9.516728] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    9.527751] hub 1-0:1.0: USB hub found
[    9.827109] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[   10.029600] usb 1-1: New USB device found, idVendor=0424, idProduct=2514, bcdDevice= b.b3
[   10.071198] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[   10.111575] hub 1-1:1.0: USB hub found
[   10.741225] usb 1-1: USB disconnect, device number 2
[   10.789292] usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
[   10.843210] usb usb1-port1: Cannot enable. Maybe the USB cable is bad?
[   11.361157] usb 1-1: new high-speed USB device number 5 using ci_hdrc
[   11.891163] usb 1-1: new high-speed USB device number 6 using ci_hdrc
[   12.231248] usb usb1-port1: unable to enumerate USB device

The issue was reproduced on a recent v6.6 kernel.

Ritesh, in Cc, did the bisect and debugged this issue, he might be able
to provide more details if needed.

- Any suggestion?
- Can you please specify with SoCs are affected by this frame babble bug?
- How can I reproduce this frame babble bug? Is there an easy way to test it?

Thanks,
Francesco