From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: "Cherian, George" <George.Cherian@cavium.com>
Cc: "stable@vger.kernel.org" <stable@vger.kernel.org>,
Mathias Nyman <mathias.nyman@linux.intel.com>
Subject: Re: [PATCH] xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc
Date: Thu, 29 Nov 2018 09:03:35 +0100 [thread overview]
Message-ID: <20181129080335.GA13859@kroah.com> (raw)
In-Reply-To: <20181129072741.101099-1-george.cherian@cavium.com>
On Thu, Nov 29, 2018 at 07:28:10AM +0000, Cherian, George wrote:
> From: "Cherian, George" <George.Cherian@cavium.com>
>
> commit 11644a7659529730eaf2f166efaabe7c3dc7af8c upstream
>
> 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().
>
> Cc: stable@vger.kernel.org
> Cc: stable@vger.kernel.org # 4.14.x: 36b6857: xhci: Allow more than 32 quirks
> Signed-off-by: George Cherian <george.cherian@cavium.com>
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
> There is a conflict while cherry-pick of 36b6857: xhci: Allow more than
> 32 quirks. It is trivial to resolve. Let me know in case if it is an
> issue.
I fixed it up, thanks.
greg k-h
prev parent reply other threads:[~2018-11-29 19:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-29 7:28 [PATCH] xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc Cherian, George
2018-11-29 8:03 ` Greg Kroah-Hartman [this message]
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