linux-kernel - Re: [PATCH 0/2] Allow breaking up Thunderbolt/USB4 updates

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Date:   Mon, 22 Jun 2020 20:09:01 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Mario.Limonciello@...l.com
Cc:     andreas.noever@...il.com, michael.jamet@...el.com,
        YehezkelShB@...il.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Allow breaking up Thunderbolt/USB4 updates

On Mon, Jun 22, 2020 at 04:41:35PM +0000, Mario.Limonciello@...l.com wrote:
> > -----Original Message-----
> > From: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > Sent: Monday, June 22, 2020 11:38 AM
> > To: Limonciello, Mario
> > Cc: Andreas Noever; Michael Jamet; Yehezkel Bernat; linux-usb@...r.kernel.org;
> > linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH 0/2] Allow breaking up Thunderbolt/USB4 updates
> > 
> > 
> > [EXTERNAL EMAIL]
> > 
> > Hi Mario,
> > 
> > On Mon, Jun 22, 2020 at 09:30:33AM -0500, Mario Limonciello wrote:
> > > Currently updates to Thunderbolt and USB4 controllers are fully atomic
> > > actions. When writing into the non-active NVM nothing gets flushed to
> > > the hardware until authenticate is sent.
> > >
> > > There has been some desire to improve the perceived performance of these
> > > updates, particularly for userland that may perform the update upon
> > > a performance sensitive time like logging out.
> > >
> > > So allow userland to flush the image to hardware at runtime, and then
> > > allow authenticating the image at another time.
> > >
> > > For the Dell WD19TB some specific hardware capability exists that allows
> > > extending this to automatically complete the update when unplugged.
> > > Export that functionality to userspace as well.
> > >
> > > This patch series is done relative thunderbolt.git/next.
> > 
> > Thanks for the patch series. I wonder if you could base this on top of
> > my "retimer NVM upgrade" series here (you are also Cc'd):
> > 
> >   https://lore.kernel.org/linux-usb/20200616135617.85752-1-
> > mika.westerberg@...ux.intel.com/
> > 
> > That series moves some of the common NVM functionality into a separate
> > file (nvm.c).
> 
> Sure thing.  Do you by chance already have that on a public branch somewhere
> that I can easily rebase it?

I just pushed "bleeding-edge" branch that you should be able to base
your stuff on top:

   https://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt.git/log/?h=bleeding-edge

It includes a couple of other patches as well (subject to change since
they are also under review).