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From: Mathias Nyman <mathias.nyman@intel.com>
To: "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 13:26:41 +0200	[thread overview]
Message-ID: <d450f63d-b1ed-afe2-4bde-4d1aa246d079@intel.com> (raw)
In-Reply-To: <1540896507-23876-1-git-send-email-george.cherian@cavium.com>

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

-Mathias

  reply	other threads:[~2018-10-30 11:23 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 [this message]
2018-10-30 12:29   ` George Cherian

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