Re: [PATCH 0/9] thunderbolt: Offline on-board retimer NVM upgrade support

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

On Thu, May 20, 2021 at 10:59:12AM +0200, Greg Kroah-Hartman wrote:
> On Wed, May 19, 2021 at 05:12:50PM +0300, Mika Westerberg wrote:
> > Hi all,
> > 
> > USB4 retimers are only accessible when the USB4 is up. However, sometimes
> > it may be useful to be able to upgrade on-board retimers even if the link
> > is not up. For instance if the user simply does not have any USB4 devices.
> > 
> > Making retimers accessible in "offline" mode requires some help from the
> > platform firmware (ACPI in our case) to turn on power to the retimers and
> > cycle them through different modes to get the sideband link up. This may
> > also involve other firmwares such as Embedded Controller (as it is the case
> > with recent Chromebooks).
> > 
> > This series adds support for "offline" retimer NVM upgrade so that it first
> > exposes each USB4 port to the userspace. If the platform firmware provides
> > a special _DSM-method (Device Specific Method) under the USB4 port ACPI
> > description, we expose two attributes under the port that the userspace can
> > use to put the port to offline mode and rescan for the retimers. Otherwise
> > the NVM upgrade works the same way than with the online mode. We also add
> > documentation to the admin-guide how this can be done.
> > 
> > In addition to this, at least Intel USB4 devices (and retimers) allow
> > running NVM authenticate (upgrade) separately from write so we make it
> > possible for the userspace to run the write and authenticate in two steps.
> > This allows userspace to trigger the authentication at later time, like
> > when the user logs out.
> > 
> > Mika Westerberg (4):
> >   thunderbolt: Log the link as TBT instead of TBT3
> >   thunderbolt: Add USB4 port devices
> >   thunderbolt: Allow router NVM authenticate separately
> >   thunderbolt: Check for NVM authentication status after the operation started
> > 
> > Rajmohan Mani (5):
> >   thunderbolt: Add support for ACPI _DSM to power on/off retimers
> >   thunderbolt: Add additional USB4 port operations for retimer access
> >   thunderbolt: Add support for retimer NVM upgrade when there is no link
> >   thunderbolt: Move nvm_write_ops to tb.h
> >   thunderbolt: Add WRITE_ONLY and AUTHENTICATE_ONLY NVM operations for retimers
> 
> Looks good:
> 
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Thanks!

All applied to thunderbolt.git/next.