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@xxxxxxxxxxxxxxx/ > > 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.
