Thunderbolt and DP altmode support for cros-ec-typec

From:		Abhishek Pandit-Subedi <abhishekpandit-AT-chromium.org>
To:		heikki.krogerus-AT-linux.intel.com, tzungbi-AT-kernel.org
Subject:		[PATCH 0/8] Thunderbolt and DP altmode support for cros-ec-typec
Date:		Wed, 25 Sep 2024 09:25:01 -0700
Message-ID:		<20240925162513.435177-1-abhishekpandit@chromium.org>
Cc:		jthies-AT-google.com, pmalani-AT-chromium.org, akuchynski-AT-google.com, Abhishek Pandit-Subedi <abhishekpandit-AT-chromium.org>, Benson Leung <bleung-AT-chromium.org>, Greg Kroah-Hartman <gregkh-AT-linuxfoundation.org>, Guenter Roeck <groeck-AT-chromium.org>, chrome-platform-AT-lists.linux.dev, linux-kernel-AT-vger.kernel.org, linux-usb-AT-vger.kernel.org
Archive-link:		Article


Hi Heikki, Tzung-Bi et al,

This patch series adds support for alternate mode entry for the
cros-ec-typec driver for Displayport and Thunderbolt.

Thunderbolt support is added by adapting an RFC Heikki had posted
previously:

https://lore.kernel.org/linux-usb/20191230152857.43917-1-...

A few comments on the series:

* The cros-ec interface will not accept any VDOs/VDMs so we simply
  ignore any configurations we are passed (i.e. DPConfigure). This means
  the sysfs control of DP lanes won't work.
* ChromeOS has two modes of operation for alt-modes: entirely EC driven
  or AP-driven from userspace (via the typec daemon). Thus, we never
  expect the kernel alt-mode drivers to auto-enter modes.

This was tested on kernel 6.6 with a ChromeOS Brya device and compile
tested against linux-usb (with allmodconfig).

Thanks,
Abhishek


Abhishek Pandit-Subedi (7):
  usb: typec: altmode_match should handle TYPEC_ANY_MODE
  usb: typec: intel_pmc_mux: Null check before use
  usb: typec: Auto enter control for alternate modes
  platform/chrome: cros_ec_typec: Update partner altmode active
  platform/chrome: cros_ec_typec: Displayport support
  platform/chrome: cros_ec_typec: Thunderbolt support
  platform/chrome: cros_ec_typec: Disable auto_enter

Heikki Krogerus (1):
  usb: typec: Add driver for Thunderbolt 3 Alternate Mode

 Documentation/ABI/testing/sysfs-bus-typec     |   9 +
 MAINTAINERS                                   |   5 +-
 drivers/platform/chrome/Makefile              |   3 +
 drivers/platform/chrome/cros_ec_typec.c       |  55 ++-
 drivers/platform/chrome/cros_ec_typec.h       |   1 +
 drivers/platform/chrome/cros_typec_altmode.h  |  48 +++
 .../platform/chrome/cros_typec_displayport.c  | 247 ++++++++++++++
 .../platform/chrome/cros_typec_thunderbolt.c  | 184 ++++++++++
 drivers/usb/typec/altmodes/Kconfig            |   9 +
 drivers/usb/typec/altmodes/Makefile           |   2 +
 drivers/usb/typec/altmodes/displayport.c      |   6 +-
 drivers/usb/typec/altmodes/thunderbolt.c      | 322 ++++++++++++++++++
 drivers/usb/typec/class.c                     |  34 +-
 drivers/usb/typec/mux/intel_pmc_mux.c         |   9 +-
 include/linux/usb/typec.h                     |   2 +
 include/linux/usb/typec_altmode.h             |   2 +
 16 files changed, 918 insertions(+), 20 deletions(-)
 create mode 100644 drivers/platform/chrome/cros_typec_altmode.h
 create mode 100644 drivers/platform/chrome/cros_typec_displayport.c
 create mode 100644 drivers/platform/chrome/cros_typec_thunderbolt.c
 create mode 100644 drivers/usb/typec/altmodes/thunderbolt.c

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2.46.0.792.g87dc391469-goog