LKML Archive on
help / color / mirror / Atom feed
From: Mathias Nyman <>
To: "Cherian, George" <>,
	"" <>,
	"" <>
Cc: "" <>,
	"" <>
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: <> (raw)
In-Reply-To: <>

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 <>

Thanks, adding to queue


  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \
    --subject='Re: [PATCH v3] xhci: Add quirk to workaround the errata seen on Cavium Thunder-X2 Soc' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).