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

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Date:   Mon, 22 Jun 2020 14:39:36 +0000
From:   <Mario.Limonciello@...l.com>
To:     <andreas.noever@...il.com>, <michael.jamet@...el.com>,
        <mika.westerberg@...ux.intel.com>, <YehezkelShB@...il.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/2] Allow breaking up Thunderbolt/USB4 updates

> -----Original Message-----
> From: Limonciello, Mario <Mario_Limonciello@...l.com>
> Sent: Monday, June 22, 2020 9:31 AM
> To: Andreas Noever; Michael Jamet; Mika Westerberg; Yehezkel Bernat
> Cc: linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org; Limonciello,
> Mario
> Subject: [PATCH 0/2] Allow breaking up Thunderbolt/USB4 updates
> 
> 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.
> 
> Mario Limonciello (2):
>   thunderbolt: Add support for separating the flush to SPI and
>     authenticate
>   thunderbolt: Add support for authenticate on disconnect
> 
>  .../ABI/testing/sysfs-bus-thunderbolt         | 24 +++++-
>  drivers/thunderbolt/Makefile                  |  1 +
>  drivers/thunderbolt/eeprom.c                  |  2 +
>  drivers/thunderbolt/lc.c                      | 14 ++++
>  drivers/thunderbolt/quirks.c                  | 38 +++++++++
>  drivers/thunderbolt/switch.c                  | 81 +++++++++++++++----
>  drivers/thunderbolt/tb-quirks.h               | 16 ++++
>  drivers/thunderbolt/tb.h                      |  4 +
>  drivers/thunderbolt/tb_regs.h                 |  1 +
>  9 files changed, 162 insertions(+), 19 deletions(-)
>  create mode 100644 drivers/thunderbolt/quirks.c
>  create mode 100644 drivers/thunderbolt/tb-quirks.h
> 
> --
> 2.25.1

Just to connect the dots, here is the matching userspace changes for this
change: https://github.com/fwupd/fwupd/pull/2204