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

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Date:   Mon, 22 Jun 2020 19:37:56 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Allow breaking up Thunderbolt/USB4 updates

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@linux.intel.com/

That series moves some of the common NVM functionality into a separate
file (nvm.c).

> 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