linux-kernel - Re: [PATCH v3] xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc

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Message-ID: <f218c1fb-dd5f-3d45-52e3-1825118cd1de@caviumnetworks.com>
Date:   Tue, 30 Oct 2018 12:29:07 +0000
From:   George Cherian <gcherian@...iumnetworks.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        "Cherian, George" <George.Cherian@...ium.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>
Subject: Re: [PATCH v3] xhci: Add quirk to workaround the errata seen on
 Cavium Thunder-X2 Soc



On 10/30/2018 04:56 PM, Mathias Nyman wrote:
> 
> On 30.10.2018 12:48, Cherian, George wrote:
>> Implement workaround for ThunderX2 Errata-129 (documented in
>> CN99XX Known Issues" available at Cavium support site).
>> As per ThunderX2errata-129, USB 2 device may come up as USB 1
>> if a connection to a USB 1 device is followed by another connection to
>> a USB 2 device, the link will come up as USB 1 for the USB 2 device.
>>
>> Resolution: Reset the PHY after the USB 1 device is disconnected.
>> The PHY reset sequence is done using private registers in XHCI register
>> space. After the PHY is reset we check for the PLL lock status and retry
>> the operation if it fails. From our tests, retrying 4 times is 
>> sufficient.
>>
>> Add a new quirk flag XHCI_RESET_PLL_ON_DISCONNECT to invoke the 
>> workaround
>> in handle_xhci_port_status().
>>
>> Signed-off-by: George Cherian <george.cherian@...ium.com>
> 
> Thanks, adding to queue
> 
Thank you!!
> -Mathias

Regards,
-George