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From: George Cherian <gcherian@caviumnetworks.com>
To: Mathias Nyman <mathias.nyman@intel.com>,
"Cherian, George" <George.Cherian@cavium.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"stern@rowland.harvard.edu" <stern@rowland.harvard.edu>
Subject: Re: [PATCH v3] xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc
Date: Tue, 30 Oct 2018 12:29:07 +0000 [thread overview]
Message-ID: <f218c1fb-dd5f-3d45-52e3-1825118cd1de@caviumnetworks.com> (raw)
In-Reply-To: <d450f63d-b1ed-afe2-4bde-4d1aa246d079@intel.com>
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@cavium.com>
>
> Thanks, adding to queue
>
Thank you!!
> -Mathias
Regards,
-George
prev parent reply other threads:[~2018-10-30 12:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-30 10:48 Cherian, George
2018-10-30 11:26 ` Mathias Nyman
2018-10-30 12:29 ` George Cherian [this message]
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