Re: [PATCH 0/6] thunderbolt: Add retimer NVM upgrade support

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Tue, Jun 16, 2020 at 04:56:11PM +0300, Mika Westerberg wrote:
> Hi all,
> 
> USB4 added standard means for accessing retimers on the link. This access
> is done through the side-band channel (two side-band wires in Type-C
> cable). The retimer specification is part of USB4 spec and can be
> downloaded here:
> 
>   https://www.usb.org/sites/default/files/USB4%20Specification_5.zip
> 
> On-board retimers are represented as devices and added under the router
> they belong to with names like <device>:<port>.<index>. We re-use some of
> the current NVM upgrade code for routers for retimers as well. Also we only
> expose these when software connection manager is used. It is not clear if
> firmware connection manager is going to support this (and what kind of
> messaging it needs).
> 
> The user-space interface is the same we have for routers so that should
> allow code re-use for tools such as fwupd.
> 
> Currently only Intel NVM format is supported but this will be relaxed once
> we learn format of other vendors.
> 
> This series applies on top of the tunneling improvements series here:
> 
>   https://lore.kernel.org/linux-usb/20200615142645.56209-1-mika.westerberg@linux.intel.com/
> 
> Kranthi Kuntala (1):
>   thunderbolt: Add support for on-board retimers
> 
> Mika Westerberg (4):
>   thunderbolt: Add Intel USB-IF ID to the NVM upgrade supported list
>   thunderbolt: Split common NVM functionality into a separate file
>   thunderbolt: Generalize usb4_switch_do_[read|write]_data()
>   thunderbolt: Retry USB4 block read operation
> 
> Rajmohan Mani (1):
>   thunderbolt: Implement USB4 port sideband operations for retimer access

Queued for v5.9.