linux-kernel - [PATCH v3 0/2] Allow breaking up Thunderbolt/USB4 updates

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Date:   Tue, 23 Jun 2020 11:14:27 -0500
From:   Mario Limonciello <mario.limonciello@...l.com>
To:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        perry.yuan@...l.com, Mario Limonciello <mario.limonciello@...l.com>
Subject: [PATCH v3 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.

Changes from v2 to v3:
 - Correct some whitespace and kernel-doc comments
 - Add another missing 'const'
 - For a quirk: (1<<1) -> BIT(0) 

Changes from v1 to v2:
 - Improve documentation
 - Drop tb-quirks.h
 - Adjust function and parameter names to Mika's preferences
 - Rebase onto thunderbolt.git/bleeding-edge to move on top of retimer work

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