linux-kernel - [PATCH v2 0/7] Thunderbolt and DP altmode support for cros-ec-typec

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Message-ID: <20241030212854.998318-1-abhishekpandit@chromium.org>
Date: Wed, 30 Oct 2024 14:28:31 -0700
From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To: heikki.krogerus@...ux.intel.com,
	tzungbi@...nel.org,
	linux-usb@...r.kernel.org,
	chrome-platform@...ts.linux.dev
Cc: dmitry.baryshkov@...aro.org,
	jthies@...gle.com,
	akuchynski@...gle.com,
	pmalani@...omium.org,
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Guenter Roeck <groeck@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/7] Thunderbolt and DP altmode support for cros-ec-typec


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-heikki.krogerus@linux.intel.com/

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 don't
  expect the kernel alt-mode drivers to auto-enter modes in all cases.
  This series allows auto-enter for displayport but disables it for TBT
  for this reason.

This was tested with a ChromeOS Brya device using kernel 6.6 and built
with allmodconfig for linux-usb.

Thanks,
Abhishek

Changes in v2:
- Use <linux/usb/typec_tbt.h> and add missing TBT_CABLE_ROUNDED
- Pass struct typec_thunderbolt_data to typec_altmode_notify
- Rename TYPEC_TBT_MODE to USB_TYPEC_TBT_MODE
- Use USB_TYPEC_TBT_SID and USB_TYPEC_TBT_MODE for device id
- Change module license to GPL due to checkpatch warning
- Update altmode_match to ignore mode entirely
- Also apply the same behavior to typec_match
- Refactored displayport into cros_typec_altmode.c to extract common
  implementation between altmodes
- Refactored thunderbolt support into cros_typec_altmode.c
- Only disable auto-enter for Thunderbolt
- Update commit message to clearly indicate the need for userspace
  intervention to enter TBT mode

Abhishek Pandit-Subedi (6):
  usb: typec: Only use SVID for matching altmodes
  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 tbt auto_enter

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

 Documentation/ABI/testing/sysfs-bus-typec    |   9 +
 MAINTAINERS                                  |   3 +
 drivers/platform/chrome/Makefile             |   3 +-
 drivers/platform/chrome/cros_ec_typec.c      |  56 ++-
 drivers/platform/chrome/cros_ec_typec.h      |   1 +
 drivers/platform/chrome/cros_typec_altmode.c | 362 +++++++++++++++++++
 drivers/platform/chrome/cros_typec_altmode.h |  48 +++
 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     | 309 ++++++++++++++++
 drivers/usb/typec/bus.c                      |   3 +-
 drivers/usb/typec/class.c                    |  33 +-
 include/linux/usb/typec.h                    |   2 +
 include/linux/usb/typec_altmode.h            |   2 +
 include/linux/usb/typec_tbt.h                |   3 +-
 16 files changed, 830 insertions(+), 21 deletions(-)
 create mode 100644 drivers/platform/chrome/cros_typec_altmode.c
 create mode 100644 drivers/platform/chrome/cros_typec_altmode.h
 create mode 100644 drivers/usb/typec/altmodes/thunderbolt.c

-- 
2.47.0.163.g1226f6d8fa-goog