[PATCH v5 0/8] Thunderbolt and DP altmode support for cros-ec-typec

[PATCH v5 0/8] Thunderbolt and DP altmode support for cros-ec-typec

[Abhishek Pandit-Subedi]

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 v5:
- Rebase with module_alias_printf
- Add lockdep, missing includes and fix up block comment style.
- Extract port altmode ".active" changes to its own patch
- Put dev_err on single line.
- Slip clang-format a washington to look the other way.
- Use list_for_each_entry and simplify conditional statement within
- Include missing headers for altmodes
- Consistent use of `adata` for altmode data
- Fix incorrect alloc size of dp_data

Changes in v4:
- Large refactor to use cable_altmodes
- Fixed ordering of cable mode enter/exit (SOP', SOP", then port for
  enter; reverse order for exit)
- Other small fixes from v3 feedback
- memset struct typec_altmode_desc
- Add CONFIG_CROS_EC_TYPEC_ALTMODES for Makefile use
- Move ap_driven_altmode check to common vdm function
- Add locking to protect shared data
- Update enter/exit error messages
- Update Makefile + Kconfig to use CONFIG_CROS_EC_TYPEC_ALTMODES
- Add locking in vdm function

Changes in v3:
- Removed mode from altmode device ids
- Updated modalias for typecd bus to remove mode
- Re-ordered to start of series
- Revert rename of TYPEC_TBT_MODE
- Remove mode from typec_device_id
- Refactored typec_altmode_dp_data per review request
- Removed unused vdm operations during altmode registration
- Fix usage of TBT sid and mode.
- Removed unused vdm operations during altmode registration
- Set port.inactive = true instead of auto-enter.

Changes in v2:
- Update altmode_match to ignore mode entirely
- Also apply the same behavior to typec_match
- 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
- 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

Changes in v1:
- Delay cable + plug checks so that the module doesn't fail to probe
  if cable + plug information isn't available by the time the partner
  altmode is registered.
- Remove unncessary brace after if (IS_ERR(plug))

Abhishek Pandit-Subedi (7):
  usb: typec: Only use SVID for matching altmodes
  usb: typec: Make active on port altmode writable
  usb: typec: Print err when displayport fails to enter
  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 on port

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

 MAINTAINERS                                  |   3 +
 drivers/platform/chrome/Kconfig              |   7 +
 drivers/platform/chrome/Makefile             |   4 +
 drivers/platform/chrome/cros_ec_typec.c      |  46 ++-
 drivers/platform/chrome/cros_ec_typec.h      |   1 +
 drivers/platform/chrome/cros_typec_altmode.c | 373 ++++++++++++++++++
 drivers/platform/chrome/cros_typec_altmode.h |  51 +++
 drivers/usb/typec/altmodes/Kconfig           |   9 +
 drivers/usb/typec/altmodes/Makefile          |   2 +
 drivers/usb/typec/altmodes/displayport.c     |   4 +-
 drivers/usb/typec/altmodes/nvidia.c          |   2 +-
 drivers/usb/typec/altmodes/thunderbolt.c     | 388 +++++++++++++++++++
 drivers/usb/typec/bus.c                      |   6 +-
 drivers/usb/typec/class.c                    |   9 +-
 include/linux/usb/typec.h                    |   2 +
 include/linux/usb/typec_tbt.h                |   1 +
 scripts/mod/devicetable-offsets.c            |   1 -
 scripts/mod/file2alias.c                     |   9 +-
 18 files changed, 885 insertions(+), 33 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

-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 1/8] usb: typec: Only use SVID for matching altmodes

[Abhishek Pandit-Subedi]

Mode in struct typec_altmode is used to indicate the index of the
altmode on a port, partner or plug. It is used in enter mode VDMs but
doesn't make much sense for matching against altmode drivers or for
matching partner to port altmodes.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---

Changes in v5:
- Rebase with module_alias_printf

Changes in v3:
- Removed mode from altmode device ids
- Updated modalias for typecd bus to remove mode
- Re-ordered to start of series

Changes in v2:
- Update altmode_match to ignore mode entirely
- Also apply the same behavior to typec_match

 drivers/usb/typec/altmodes/displayport.c | 2 +-
 drivers/usb/typec/altmodes/nvidia.c      | 2 +-
 drivers/usb/typec/bus.c                  | 6 ++----
 drivers/usb/typec/class.c                | 4 ++--
 scripts/mod/devicetable-offsets.c        | 1 -
 scripts/mod/file2alias.c                 | 9 ++-------
 6 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 2f03190a9873..3245e03d59e6 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -791,7 +791,7 @@ void dp_altmode_remove(struct typec_altmode *alt)
 EXPORT_SYMBOL_GPL(dp_altmode_remove);
 
 static const struct typec_device_id dp_typec_id[] = {
-	{ USB_TYPEC_DP_SID, USB_TYPEC_DP_MODE },
+	{ USB_TYPEC_DP_SID },
 	{ },
 };
 MODULE_DEVICE_TABLE(typec, dp_typec_id);
diff --git a/drivers/usb/typec/altmodes/nvidia.c b/drivers/usb/typec/altmodes/nvidia.c
index fe70b36f078f..2b77d931e494 100644
--- a/drivers/usb/typec/altmodes/nvidia.c
+++ b/drivers/usb/typec/altmodes/nvidia.c
@@ -24,7 +24,7 @@ static void nvidia_altmode_remove(struct typec_altmode *alt)
 }
 
 static const struct typec_device_id nvidia_typec_id[] = {
-	{ USB_TYPEC_NVIDIA_VLINK_SID, TYPEC_ANY_MODE },
+	{ USB_TYPEC_NVIDIA_VLINK_SID },
 	{ },
 };
 MODULE_DEVICE_TABLE(typec, nvidia_typec_id);
diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
index aa879253d3b8..ae90688d23e4 100644
--- a/drivers/usb/typec/bus.c
+++ b/drivers/usb/typec/bus.c
@@ -454,8 +454,7 @@ static int typec_match(struct device *dev, const struct device_driver *driver)
 	const struct typec_device_id *id;
 
 	for (id = drv->id_table; id->svid; id++)
-		if (id->svid == altmode->svid &&
-		    (id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
+		if (id->svid == altmode->svid)
 			return 1;
 	return 0;
 }
@@ -470,8 +469,7 @@ static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	if (add_uevent_var(env, "MODE=%u", altmode->mode))
 		return -ENOMEM;
 
-	return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
-			      altmode->svid, altmode->mode);
+	return add_uevent_var(env, "MODALIAS=typec:id%04X", altmode->svid);
 }
 
 static int typec_altmode_create_links(struct altmode *alt)
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 4b3047e055a3..febe453b96be 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -237,13 +237,13 @@ static int altmode_match(struct device *dev, void *data)
 	if (!is_typec_altmode(dev))
 		return 0;
 
-	return ((adev->svid == id->svid) && (adev->mode == id->mode));
+	return (adev->svid == id->svid);
 }
 
 static void typec_altmode_set_partner(struct altmode *altmode)
 {
 	struct typec_altmode *adev = &altmode->adev;
-	struct typec_device_id id = { adev->svid, adev->mode, };
+	struct typec_device_id id = { adev->svid };
 	struct typec_port *port = typec_altmode2port(adev);
 	struct altmode *partner;
 	struct device *dev;
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index 9c7b404defbd..d3d00e85edf7 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -237,7 +237,6 @@ int main(void)
 
 	DEVID(typec_device_id);
 	DEVID_FIELD(typec_device_id, svid);
-	DEVID_FIELD(typec_device_id, mode);
 
 	DEVID(tee_client_device_id);
 	DEVID_FIELD(tee_client_device_id, uuid);
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 5b5745f00eb3..7049c31062c6 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1221,17 +1221,12 @@ static void do_tbsvc_entry(struct module *mod, void *symval)
 	module_alias_printf(mod, true, "tbsvc:%s", alias);
 }
 
-/* Looks like: typec:idNmN */
+/* Looks like: typec:idN */
 static void do_typec_entry(struct module *mod, void *symval)
 {
-	char alias[256] = {};
-
 	DEF_FIELD(symval, typec_device_id, svid);
-	DEF_FIELD(symval, typec_device_id, mode);
-
-	ADD(alias, "m", mode != TYPEC_ANY_MODE, mode);
 
-	module_alias_printf(mod, false, "typec:id%04X%s", svid, alias);
+	module_alias_printf(mod, false, "typec:id%04X", svid);
 }
 
 /* Looks like: tee:uuid */
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 2/8] usb: typec: Add driver for Thunderbolt 3 Alternate Mode

[Abhishek Pandit-Subedi]

From: Heikki Krogerus <heikki.krogerus@linux.intel.com>

Thunderbolt 3 Alternate Mode entry flow is described in
USB Type-C Specification Release 2.0.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Co-developed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

Changes in v5:
- Add lockdep, missing includes and fix up block comment style.

Changes in v4:
- Large refactor to use cable_altmodes
- Fixed ordering of cable mode enter/exit (SOP', SOP", then port for
  enter; reverse order for exit)
- Other small fixes from v3 feedback

Changes in v3:
- Revert rename of TYPEC_TBT_MODE
- Remove mode from typec_device_id

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

Changes in v1:
- Delay cable + plug checks so that the module doesn't fail to probe
  if cable + plug information isn't available by the time the partner
  altmode is registered.
- Remove unncessary brace after if (IS_ERR(plug))

 drivers/usb/typec/altmodes/Kconfig       |   9 +
 drivers/usb/typec/altmodes/Makefile      |   2 +
 drivers/usb/typec/altmodes/thunderbolt.c | 388 +++++++++++++++++++++++
 include/linux/usb/typec_tbt.h            |   1 +
 4 files changed, 400 insertions(+)
 create mode 100644 drivers/usb/typec/altmodes/thunderbolt.c

diff --git a/drivers/usb/typec/altmodes/Kconfig b/drivers/usb/typec/altmodes/Kconfig
index 1a6b5e872b0d..7867fa7c405d 100644
--- a/drivers/usb/typec/altmodes/Kconfig
+++ b/drivers/usb/typec/altmodes/Kconfig
@@ -23,4 +23,13 @@ config TYPEC_NVIDIA_ALTMODE
 	  To compile this driver as a module, choose M here: the
 	  module will be called typec_nvidia.
 
+config TYPEC_TBT_ALTMODE
+	tristate "Thunderbolt3 Alternate Mode driver"
+	help
+	  Select this option if you have Thunderbolt3 hardware on your
+	  system.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called typec_thunderbolt.
+
 endmenu
diff --git a/drivers/usb/typec/altmodes/Makefile b/drivers/usb/typec/altmodes/Makefile
index 45717548b396..508a68351bd2 100644
--- a/drivers/usb/typec/altmodes/Makefile
+++ b/drivers/usb/typec/altmodes/Makefile
@@ -4,3 +4,5 @@ obj-$(CONFIG_TYPEC_DP_ALTMODE)		+= typec_displayport.o
 typec_displayport-y			:= displayport.o
 obj-$(CONFIG_TYPEC_NVIDIA_ALTMODE)	+= typec_nvidia.o
 typec_nvidia-y				:= nvidia.o
+obj-$(CONFIG_TYPEC_TBT_ALTMODE)		+= typec_thunderbolt.o
+typec_thunderbolt-y			:= thunderbolt.o
diff --git a/drivers/usb/typec/altmodes/thunderbolt.c b/drivers/usb/typec/altmodes/thunderbolt.c
new file mode 100644
index 000000000000..1b475b1d98e7
--- /dev/null
+++ b/drivers/usb/typec/altmodes/thunderbolt.c
@@ -0,0 +1,388 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB Typec-C Thunderbolt3 Alternate Mode driver
+ *
+ * Copyright (C) 2019 Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ */
+
+#include <linux/lockdep.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/usb/pd_vdo.h>
+#include <linux/usb/typec_altmode.h>
+#include <linux/usb/typec_tbt.h>
+
+enum tbt_state {
+	TBT_STATE_IDLE,
+	TBT_STATE_SOP_P_ENTER,
+	TBT_STATE_SOP_PP_ENTER,
+	TBT_STATE_ENTER,
+	TBT_STATE_EXIT,
+	TBT_STATE_SOP_PP_EXIT,
+	TBT_STATE_SOP_P_EXIT
+};
+
+struct tbt_altmode {
+	enum tbt_state state;
+	struct typec_cable *cable;
+	struct typec_altmode *alt;
+	struct typec_altmode *plug[2];
+	u32 enter_vdo;
+
+	struct work_struct work;
+	struct mutex lock; /* device lock */
+};
+
+static bool tbt_ready(struct typec_altmode *alt);
+
+static int tbt_enter_mode(struct tbt_altmode *tbt)
+{
+	struct typec_altmode *plug = tbt->plug[TYPEC_PLUG_SOP_P];
+	u32 vdo;
+
+	vdo = tbt->alt->vdo & (TBT_VENDOR_SPECIFIC_B0 | TBT_VENDOR_SPECIFIC_B1);
+	vdo |= tbt->alt->vdo & TBT_INTEL_SPECIFIC_B0;
+	vdo |= TBT_MODE;
+
+	if (plug) {
+		if (typec_cable_is_active(tbt->cable))
+			vdo |= TBT_ENTER_MODE_ACTIVE_CABLE;
+
+		vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_SPEED(plug->vdo));
+		vdo |= plug->vdo & TBT_CABLE_ROUNDED;
+		vdo |= plug->vdo & TBT_CABLE_OPTICAL;
+		vdo |= plug->vdo & TBT_CABLE_RETIMER;
+		vdo |= plug->vdo & TBT_CABLE_LINK_TRAINING;
+	} else {
+		vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_USB3_PASSIVE);
+	}
+
+	tbt->enter_vdo = vdo;
+	return typec_altmode_enter(tbt->alt, &vdo);
+}
+
+static void tbt_altmode_work(struct work_struct *work)
+{
+	struct tbt_altmode *tbt = container_of(work, struct tbt_altmode, work);
+	int ret;
+
+	mutex_lock(&tbt->lock);
+
+	switch (tbt->state) {
+	case TBT_STATE_SOP_P_ENTER:
+		ret = typec_cable_altmode_enter(tbt->alt, TYPEC_PLUG_SOP_P, NULL);
+		if (ret) {
+			dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_P]->dev,
+				"failed to enter mode (%d)\n", ret);
+			goto disable_plugs;
+		}
+		break;
+	case TBT_STATE_SOP_PP_ENTER:
+		ret = typec_cable_altmode_enter(tbt->alt, TYPEC_PLUG_SOP_PP,  NULL);
+		if (ret) {
+			dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_PP]->dev,
+				"failed to enter mode (%d)\n", ret);
+			goto disable_plugs;
+		}
+		break;
+	case TBT_STATE_ENTER:
+		ret = tbt_enter_mode(tbt);
+		if (ret)
+			dev_dbg(&tbt->alt->dev, "failed to enter mode (%d)\n",
+				ret);
+		break;
+	case TBT_STATE_EXIT:
+		typec_altmode_exit(tbt->alt);
+		break;
+	case TBT_STATE_SOP_PP_EXIT:
+		typec_cable_altmode_exit(tbt->alt, TYPEC_PLUG_SOP_PP);
+		break;
+	case TBT_STATE_SOP_P_EXIT:
+		typec_cable_altmode_exit(tbt->alt, TYPEC_PLUG_SOP_P);
+		break;
+	default:
+		break;
+	}
+
+	tbt->state = TBT_STATE_IDLE;
+
+	mutex_unlock(&tbt->lock);
+	return;
+
+disable_plugs:
+	for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
+		if (tbt->plug[i])
+			typec_altmode_put_plug(tbt->plug[i]);
+
+		tbt->plug[i] = NULL;
+	}
+
+	tbt->state = TBT_STATE_ENTER;
+	schedule_work(&tbt->work);
+	mutex_unlock(&tbt->lock);
+}
+
+/*
+ * If SOP' is available, enter that first (which will trigger a VDM response
+ * that will enter SOP" if available and then the port). If entering SOP' fails,
+ * stop attempting to enter either cable altmode (probably not supported) and
+ * directly enter the port altmode.
+ */
+static int tbt_enter_modes_ordered(struct typec_altmode *alt)
+{
+	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+	int ret = 0;
+
+	lockdep_assert_held(&tbt->lock);
+
+	if (!tbt_ready(tbt->alt))
+		return -ENODEV;
+
+	if (tbt->plug[TYPEC_PLUG_SOP_P]) {
+		ret = typec_cable_altmode_enter(alt, TYPEC_PLUG_SOP_P, NULL);
+		if (ret < 0) {
+			for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
+				if (tbt->plug[i])
+					typec_altmode_put_plug(tbt->plug[i]);
+
+				tbt->plug[i] = NULL;
+			}
+		} else {
+			return ret;
+		}
+	}
+
+	return tbt_enter_mode(tbt);
+}
+
+static int tbt_cable_altmode_vdm(struct typec_altmode *alt,
+				 enum typec_plug_index sop, const u32 hdr,
+				 const u32 *vdo, int count)
+{
+	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+	int cmd_type = PD_VDO_CMDT(hdr);
+	int cmd = PD_VDO_CMD(hdr);
+
+	mutex_lock(&tbt->lock);
+
+	if (tbt->state != TBT_STATE_IDLE) {
+		mutex_unlock(&tbt->lock);
+		return -EBUSY;
+	}
+
+	switch (cmd_type) {
+	case CMDT_RSP_ACK:
+		switch (cmd) {
+		case CMD_ENTER_MODE:
+			/*
+			 * Following the order described in USB Type-C Spec
+			 * R2.0 Section 6.7.3: SOP', SOP", then port.
+			 */
+			if (sop == TYPEC_PLUG_SOP_P) {
+				if (tbt->plug[TYPEC_PLUG_SOP_PP])
+					tbt->state = TBT_STATE_SOP_PP_ENTER;
+				else
+					tbt->state = TBT_STATE_ENTER;
+			} else if (sop == TYPEC_PLUG_SOP_PP)
+				tbt->state = TBT_STATE_ENTER;
+
+			break;
+		case CMD_EXIT_MODE:
+			/* Exit in opposite order: Port, SOP", then SOP'. */
+			if (sop == TYPEC_PLUG_SOP_PP)
+				tbt->state = TBT_STATE_SOP_P_EXIT;
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (tbt->state != TBT_STATE_IDLE)
+		schedule_work(&tbt->work);
+
+	mutex_unlock(&tbt->lock);
+	return 0;
+}
+
+static int tbt_altmode_vdm(struct typec_altmode *alt,
+			   const u32 hdr, const u32 *vdo, int count)
+{
+	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+	struct typec_thunderbolt_data data;
+	int cmd_type = PD_VDO_CMDT(hdr);
+	int cmd = PD_VDO_CMD(hdr);
+
+	mutex_lock(&tbt->lock);
+
+	if (tbt->state != TBT_STATE_IDLE) {
+		mutex_unlock(&tbt->lock);
+		return -EBUSY;
+	}
+
+	switch (cmd_type) {
+	case CMDT_RSP_ACK:
+		/* Port altmode is last to enter and first to exit. */
+		switch (cmd) {
+		case CMD_ENTER_MODE:
+			memset(&data, 0, sizeof(data));
+
+			data.device_mode = tbt->alt->vdo;
+			data.enter_vdo = tbt->enter_vdo;
+			if (tbt->plug[TYPEC_PLUG_SOP_P])
+				data.cable_mode = tbt->plug[TYPEC_PLUG_SOP_P]->vdo;
+
+			typec_altmode_notify(alt, TYPEC_STATE_MODAL, &data);
+			break;
+		case CMD_EXIT_MODE:
+			if (tbt->plug[TYPEC_PLUG_SOP_PP])
+				tbt->state = TBT_STATE_SOP_PP_EXIT;
+			else if (tbt->plug[TYPEC_PLUG_SOP_P])
+				tbt->state = TBT_STATE_SOP_P_EXIT;
+			break;
+		}
+		break;
+	case CMDT_RSP_NAK:
+		switch (cmd) {
+		case CMD_ENTER_MODE:
+			dev_warn(&alt->dev, "Enter Mode refused\n");
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (tbt->state != TBT_STATE_IDLE)
+		schedule_work(&tbt->work);
+
+	mutex_unlock(&tbt->lock);
+
+	return 0;
+}
+
+static int tbt_altmode_activate(struct typec_altmode *alt, int activate)
+{
+	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+	int ret;
+
+	mutex_lock(&tbt->lock);
+
+	if (activate)
+		ret = tbt_enter_modes_ordered(alt);
+	else
+		ret = typec_altmode_exit(alt);
+
+	mutex_unlock(&tbt->lock);
+
+	return ret;
+}
+
+static const struct typec_altmode_ops tbt_altmode_ops = {
+	.vdm		= tbt_altmode_vdm,
+	.activate	= tbt_altmode_activate
+};
+
+static const struct typec_cable_ops tbt_cable_ops = {
+	.vdm		= tbt_cable_altmode_vdm,
+};
+
+static int tbt_altmode_probe(struct typec_altmode *alt)
+{
+	struct tbt_altmode *tbt;
+
+	tbt = devm_kzalloc(&alt->dev, sizeof(*tbt), GFP_KERNEL);
+	if (!tbt)
+		return -ENOMEM;
+
+	INIT_WORK(&tbt->work, tbt_altmode_work);
+	mutex_init(&tbt->lock);
+	tbt->alt = alt;
+
+	alt->desc = "Thunderbolt3";
+	typec_altmode_set_drvdata(alt, tbt);
+	typec_altmode_set_ops(alt, &tbt_altmode_ops);
+
+	if (tbt_ready(alt)) {
+		if (tbt->plug[TYPEC_PLUG_SOP_P])
+			tbt->state = TBT_STATE_SOP_P_ENTER;
+		else if (tbt->plug[TYPEC_PLUG_SOP_PP])
+			tbt->state = TBT_STATE_SOP_PP_ENTER;
+		else
+			tbt->state = TBT_STATE_ENTER;
+		schedule_work(&tbt->work);
+	}
+
+	return 0;
+}
+
+static void tbt_altmode_remove(struct typec_altmode *alt)
+{
+	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+
+	for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
+		if (tbt->plug[i])
+			typec_altmode_put_plug(tbt->plug[i]);
+	}
+
+	if (tbt->cable)
+		typec_cable_put(tbt->cable);
+}
+
+static bool tbt_ready(struct typec_altmode *alt)
+{
+	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+	struct typec_altmode *plug;
+
+	if (tbt->cable)
+		return true;
+
+	/* Thunderbolt 3 requires a cable with eMarker */
+	tbt->cable = typec_cable_get(typec_altmode2port(tbt->alt));
+	if (!tbt->cable)
+		return false;
+
+	/* We accept systems without SOP' or SOP''. This means the port altmode
+	 * driver will be responsible for properly ordering entry/exit.
+	 */
+	for (int i = 0; i < TYPEC_PLUG_SOP_PP + 1; i++) {
+		plug = typec_altmode_get_plug(tbt->alt, i);
+		if (IS_ERR(plug))
+			continue;
+
+		if (!plug || plug->svid != USB_TYPEC_TBT_SID)
+			break;
+
+		plug->desc = "Thunderbolt3";
+		plug->cable_ops = &tbt_cable_ops;
+		typec_altmode_set_drvdata(plug, tbt);
+
+		tbt->plug[i] = plug;
+	}
+
+	return true;
+}
+
+static const struct typec_device_id tbt_typec_id[] = {
+	{ USB_TYPEC_TBT_SID },
+	{ }
+};
+MODULE_DEVICE_TABLE(typec, tbt_typec_id);
+
+static struct typec_altmode_driver tbt_altmode_driver = {
+	.id_table = tbt_typec_id,
+	.probe = tbt_altmode_probe,
+	.remove = tbt_altmode_remove,
+	.driver = {
+		.name = "typec-thunderbolt",
+	}
+};
+module_typec_altmode_driver(tbt_altmode_driver);
+
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Thunderbolt3 USB Type-C Alternate Mode");
diff --git a/include/linux/usb/typec_tbt.h b/include/linux/usb/typec_tbt.h
index fa97d7e00f5c..55dcea12082c 100644
--- a/include/linux/usb/typec_tbt.h
+++ b/include/linux/usb/typec_tbt.h
@@ -44,6 +44,7 @@ struct typec_thunderbolt_data {
 
 #define   TBT_GEN3_NON_ROUNDED                 0
 #define   TBT_GEN3_GEN4_ROUNDED_NON_ROUNDED    1
+#define TBT_CABLE_ROUNDED		BIT(19)
 #define TBT_CABLE_OPTICAL		BIT(21)
 #define TBT_CABLE_RETIMER		BIT(22)
 #define TBT_CABLE_LINK_TRAINING		BIT(23)
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 3/8] usb: typec: Make active on port altmode writable

[Abhishek Pandit-Subedi]

The active property of port altmode should be writable (to prevent or
allow partner altmodes from entering) and needs to be part of
typec_altmode_desc so we can initialize the port to an inactive state if
desired.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

Changes in v5:
- Extract port altmode ".active" changes to its own patch

 drivers/usb/typec/class.c | 5 +++--
 include/linux/usb/typec.h | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index febe453b96be..b5e67a57762c 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -458,7 +458,8 @@ static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
 	struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
 
 	if (attr == &dev_attr_active.attr)
-		if (!adev->ops || !adev->ops->activate)
+		if (!is_typec_port(adev->dev.parent) &&
+		    (!adev->ops || !adev->ops->activate))
 			return 0444;
 
 	return attr->mode;
@@ -563,7 +564,7 @@ typec_register_altmode(struct device *parent,
 
 	if (is_port) {
 		alt->attrs[3] = &dev_attr_supported_roles.attr;
-		alt->adev.active = true; /* Enabled by default */
+		alt->adev.active = !desc->inactive; /* Enabled by default */
 	}
 
 	sprintf(alt->group_name, "mode%d", desc->mode);
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index d616b8807000..252af3f77039 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -140,6 +140,7 @@ int typec_cable_set_identity(struct typec_cable *cable);
  * @mode: Index of the Mode
  * @vdo: VDO returned by Discover Modes USB PD command
  * @roles: Only for ports. DRP if the mode is available in both roles
+ * @inactive: Only for ports. Make this port inactive (default is active).
  *
  * Description of an Alternate Mode which a connector, cable plug or partner
  * supports.
@@ -150,6 +151,7 @@ struct typec_altmode_desc {
 	u32			vdo;
 	/* Only used with ports */
 	enum typec_port_data	roles;
+	bool			inactive;
 };
 
 void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision);
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 4/8] usb: typec: Print err when displayport fails to enter

[Abhishek Pandit-Subedi]

Print the error reason for typec_altmode_enter so users can understand
why displayport failed to enter.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

Changes in v5:
- Put dev_err on single line.
- Slip clang-format a washington to look the other way.

 drivers/usb/typec/altmodes/displayport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 3245e03d59e6..ac84a6d64c2f 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -252,7 +252,7 @@ static void dp_altmode_work(struct work_struct *work)
 	case DP_STATE_ENTER:
 		ret = typec_altmode_enter(dp->alt, NULL);
 		if (ret && ret != -EBUSY)
-			dev_err(&dp->alt->dev, "failed to enter mode\n");
+			dev_err(&dp->alt->dev, "failed to enter mode: %d\n", ret);
 		break;
 	case DP_STATE_ENTER_PRIME:
 		ret = typec_cable_altmode_enter(dp->alt, TYPEC_PLUG_SOP_P, NULL);
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 5/8] platform/chrome: cros_ec_typec: Update partner altmode active

[Abhishek Pandit-Subedi]

Mux configuration is often the final piece of mode entry and can be used
to determine whether a partner altmode is active. When mux configuration
is done, use the active port altmode's SVID to set the partner active
field for all partner alt modes.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

Changes in v5:
- Use list_for_each_entry and simplify conditional statement within

 drivers/platform/chrome/cros_ec_typec.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index ae2f86296954..77f748fc8542 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -619,6 +619,7 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
 	};
 	struct ec_params_usb_pd_mux_ack mux_ack;
 	enum typec_orientation orientation;
+	struct cros_typec_altmode_node *node;
 	int ret;
 
 	ret = cros_ec_cmd(typec->ec, 0, EC_CMD_USB_PD_MUX_INFO,
@@ -677,6 +678,14 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
 			port->mux_flags);
 	}
 
+	/* Iterate all partner alt-modes and set the active alternate mode. */
+	list_for_each_entry(node, &port->partner_mode_list, list) {
+		typec_altmode_update_active(
+			node->amode,
+			port->state.alt &&
+				node->amode->svid == port->state.alt->svid);
+	}
+
 mux_ack:
 	if (!typec->needs_mux_ack)
 		return ret;
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 6/8] platform/chrome: cros_ec_typec: Displayport support

[Abhishek Pandit-Subedi]

Add support for entering and exiting displayport alt-mode on systems
using AP driven alt-mode.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

Changes in v5:
- Include missing headers for altmodes
- Consistent use of `adata` for altmode data
- Fix incorrect alloc size of dp_data

Changes in v4:
- memset struct typec_altmode_desc
- Add CONFIG_CROS_EC_TYPEC_ALTMODES for Makefile use
- Move ap_driven_altmode check to common vdm function
- Add locking to protect shared data
- Update enter/exit error messages

Changes in v3:
- Refactored typec_altmode_dp_data per review request
- Removed unused vdm operations during altmode registration

Changes in v2:
- Refactored displayport into cros_typec_altmode.c to extract common
  implementation between altmodes

 MAINTAINERS                                  |   3 +
 drivers/platform/chrome/Kconfig              |   6 +
 drivers/platform/chrome/Makefile             |   4 +
 drivers/platform/chrome/cros_ec_typec.c      |  13 +-
 drivers/platform/chrome/cros_ec_typec.h      |   1 +
 drivers/platform/chrome/cros_typec_altmode.c | 285 +++++++++++++++++++
 drivers/platform/chrome/cros_typec_altmode.h |  37 +++
 7 files changed, 346 insertions(+), 3 deletions(-)
 create mode 100644 drivers/platform/chrome/cros_typec_altmode.c
 create mode 100644 drivers/platform/chrome/cros_typec_altmode.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 1e930c7a58b1..f90a92d62ce0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5434,9 +5434,12 @@ F:	include/linux/platform_data/cros_usbpd_notify.h
 
 CHROMEOS EC USB TYPE-C DRIVER
 M:	Prashant Malani <pmalani@chromium.org>
+M:	Benson Leung <bleung@chromium.org>
+M:	Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
 L:	chrome-platform@lists.linux.dev
 S:	Maintained
 F:	drivers/platform/chrome/cros_ec_typec.*
+F:	drivers/platform/chrome/cros_typec_altmode.*
 F:	drivers/platform/chrome/cros_typec_switch.c
 F:	drivers/platform/chrome/cros_typec_vdm.*
 
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index b7dbaf77b6db..23aa594fbb5b 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -237,12 +237,18 @@ config CROS_EC_SYSFS
 	  To compile this driver as a module, choose M here: the
 	  module will be called cros_ec_sysfs.
 
+config CROS_EC_TYPEC_ALTMODES
+	bool
+	help
+	  Selectable symbol to enable altmodes.
+
 config CROS_EC_TYPEC
 	tristate "ChromeOS EC Type-C Connector Control"
 	depends on MFD_CROS_EC_DEV && TYPEC
 	depends on CROS_USBPD_NOTIFY
 	depends on USB_ROLE_SWITCH
 	default MFD_CROS_EC_DEV
+	select CROS_EC_TYPEC_ALTMODES if TYPEC_DP_ALTMODE
 	help
 	  If you say Y here, you get support for accessing Type C connector
 	  information from the Chrome OS EC.
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index fb8335458a22..1a5a484563cc 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -19,7 +19,11 @@ obj-$(CONFIG_CROS_EC_SPI)		+= cros_ec_spi.o
 obj-$(CONFIG_CROS_EC_UART)		+= cros_ec_uart.o
 cros_ec_lpcs-objs			:= cros_ec_lpc.o cros_ec_lpc_mec.o
 cros-ec-typec-objs			:= cros_ec_typec.o cros_typec_vdm.o
+ifneq ($(CONFIG_CROS_EC_TYPEC_ALTMODES),)
+	cros-ec-typec-objs		+= cros_typec_altmode.o
+endif
 obj-$(CONFIG_CROS_EC_TYPEC)		+= cros-ec-typec.o
+
 obj-$(CONFIG_CROS_EC_LPC)		+= cros_ec_lpcs.o
 obj-$(CONFIG_CROS_EC_PROTO)		+= cros_ec_proto.o cros_ec_trace.o
 obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT)	+= cros_kbd_led_backlight.o
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 77f748fc8542..1bcaa7269395 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -18,6 +18,7 @@
 
 #include "cros_ec_typec.h"
 #include "cros_typec_vdm.h"
+#include "cros_typec_altmode.h"
 
 #define DRV_NAME "cros-ec-typec"
 
@@ -290,15 +291,15 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
 	struct typec_altmode *amode;
 
 	/* All PD capable CrOS devices are assumed to support DP altmode. */
+	memset(&desc, 0, sizeof(desc));
 	desc.svid = USB_TYPEC_DP_SID;
 	desc.mode = USB_TYPEC_DP_MODE;
 	desc.vdo = DP_PORT_VDO;
-	amode = typec_port_register_altmode(port->port, &desc);
+	amode = cros_typec_register_displayport(port, &desc,
+						typec->ap_driven_altmode);
 	if (IS_ERR(amode))
 		return PTR_ERR(amode);
 	port->port_altmode[CROS_EC_ALTMODE_DP] = amode;
-	typec_altmode_set_drvdata(amode, port);
-	amode->ops = &port_amode_ops;
 
 	/*
 	 * Register TBT compatibility alt mode. The EC will not enter the mode
@@ -576,6 +577,10 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
 	if (!ret)
 		ret = typec_mux_set(port->mux, &port->state);
 
+	if (!ret)
+		ret = cros_typec_displayport_status_update(port->state.alt,
+							   port->state.data);
+
 	return ret;
 }
 
@@ -1253,6 +1258,8 @@ static int cros_typec_probe(struct platform_device *pdev)
 
 	typec->typec_cmd_supported = cros_ec_check_features(ec_dev, EC_FEATURE_TYPEC_CMD);
 	typec->needs_mux_ack = cros_ec_check_features(ec_dev, EC_FEATURE_TYPEC_MUX_REQUIRE_AP_ACK);
+	typec->ap_driven_altmode = cros_ec_check_features(
+		ec_dev, EC_FEATURE_TYPEC_REQUIRE_AP_MODE_ENTRY);
 
 	ret = cros_ec_cmd(typec->ec, 0, EC_CMD_USB_PD_PORTS, NULL, 0,
 			  &resp, sizeof(resp));
diff --git a/drivers/platform/chrome/cros_ec_typec.h b/drivers/platform/chrome/cros_ec_typec.h
index deda180a646f..9fd5342bb0ad 100644
--- a/drivers/platform/chrome/cros_ec_typec.h
+++ b/drivers/platform/chrome/cros_ec_typec.h
@@ -39,6 +39,7 @@ struct cros_typec_data {
 	struct work_struct port_work;
 	bool typec_cmd_supported;
 	bool needs_mux_ack;
+	bool ap_driven_altmode;
 };
 
 /* Per port data. */
diff --git a/drivers/platform/chrome/cros_typec_altmode.c b/drivers/platform/chrome/cros_typec_altmode.c
new file mode 100644
index 000000000000..6e736168ccc3
--- /dev/null
+++ b/drivers/platform/chrome/cros_typec_altmode.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Alt-mode implementation on ChromeOS EC.
+ *
+ * Copyright 2024 Google LLC
+ * Author: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
+ */
+#include "cros_ec_typec.h"
+
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/usb/typec_dp.h>
+#include <linux/usb/pd_vdo.h>
+
+#include "cros_typec_altmode.h"
+
+struct cros_typec_altmode_data {
+	struct work_struct work;
+	struct cros_typec_port *port;
+	struct typec_altmode *alt;
+	bool ap_mode_entry;
+
+	struct mutex lock;
+	u32 header;
+	u32 *vdo_data;
+	u8 vdo_size;
+
+	u16 sid;
+	u8 mode;
+};
+
+struct cros_typec_dp_data {
+	struct cros_typec_altmode_data adata;
+	struct typec_displayport_data data;
+	bool configured;
+	bool pending_status_update;
+};
+
+static void cros_typec_altmode_work(struct work_struct *work)
+{
+	struct cros_typec_altmode_data *data =
+		container_of(work, struct cros_typec_altmode_data, work);
+
+	mutex_lock(&data->lock);
+
+	if (typec_altmode_vdm(data->alt, data->header, data->vdo_data,
+			      data->vdo_size))
+		dev_err(&data->alt->dev, "VDM 0x%x failed\n", data->header);
+
+	data->header = 0;
+	data->vdo_data = NULL;
+	data->vdo_size = 0;
+
+	mutex_unlock(&data->lock);
+}
+
+static int cros_typec_altmode_enter(struct typec_altmode *alt, u32 *vdo)
+{
+	struct cros_typec_altmode_data *adata = typec_altmode_get_drvdata(alt);
+	struct ec_params_typec_control req = {
+		.port = adata->port->port_num,
+		.command = TYPEC_CONTROL_COMMAND_ENTER_MODE,
+	};
+	int svdm_version;
+	int ret;
+
+	if (!adata->ap_mode_entry) {
+		dev_warn(&alt->dev,
+			 "EC does not support AP driven mode entry\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (adata->sid == USB_TYPEC_DP_SID)
+		req.mode_to_enter = CROS_EC_ALTMODE_DP;
+	else
+		return -EOPNOTSUPP;
+
+	ret = cros_ec_cmd(adata->port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL,
+			  &req, sizeof(req), NULL, 0);
+	if (ret < 0)
+		return ret;
+
+	svdm_version = typec_altmode_get_svdm_version(alt);
+	if (svdm_version < 0)
+		return svdm_version;
+
+	mutex_lock(&adata->lock);
+
+	adata->header = VDO(adata->sid, 1, svdm_version, CMD_ENTER_MODE);
+	adata->header |= VDO_OPOS(adata->mode);
+	adata->header |= VDO_CMDT(CMDT_RSP_ACK);
+	adata->vdo_data = NULL;
+	adata->vdo_size = 1;
+	schedule_work(&adata->work);
+
+	mutex_unlock(&adata->lock);
+	return ret;
+}
+
+static int cros_typec_altmode_exit(struct typec_altmode *alt)
+{
+	struct cros_typec_altmode_data *adata = typec_altmode_get_drvdata(alt);
+	struct ec_params_typec_control req = {
+		.port = adata->port->port_num,
+		.command = TYPEC_CONTROL_COMMAND_EXIT_MODES,
+	};
+	int svdm_version;
+	int ret;
+
+	if (!adata->ap_mode_entry) {
+		dev_warn(&alt->dev,
+			 "EC does not support AP driven mode exit\n");
+		return -EOPNOTSUPP;
+	}
+
+	ret = cros_ec_cmd(adata->port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL,
+			  &req, sizeof(req), NULL, 0);
+
+	if (ret < 0)
+		return ret;
+
+	svdm_version = typec_altmode_get_svdm_version(alt);
+	if (svdm_version < 0)
+		return svdm_version;
+
+	mutex_lock(&adata->lock);
+
+	adata->header = VDO(adata->sid, 1, svdm_version, CMD_EXIT_MODE);
+	adata->header |= VDO_OPOS(adata->mode);
+	adata->header |= VDO_CMDT(CMDT_RSP_ACK);
+	adata->vdo_data = NULL;
+	adata->vdo_size = 1;
+	schedule_work(&adata->work);
+
+	mutex_unlock(&adata->lock);
+	return ret;
+}
+
+static int cros_typec_displayport_vdm(struct typec_altmode *alt, u32 header,
+				      const u32 *data, int count)
+{
+	struct cros_typec_dp_data *dp_data = typec_altmode_get_drvdata(alt);
+	struct cros_typec_altmode_data *adata = &dp_data->adata;
+
+
+	int cmd_type = PD_VDO_CMDT(header);
+	int cmd = PD_VDO_CMD(header);
+	int svdm_version;
+
+	svdm_version = typec_altmode_get_svdm_version(alt);
+	if (svdm_version < 0)
+		return svdm_version;
+
+	mutex_lock(&adata->lock);
+
+	switch (cmd_type) {
+	case CMDT_INIT:
+		if (PD_VDO_SVDM_VER(header) < svdm_version) {
+			typec_partner_set_svdm_version(adata->port->partner,
+						       PD_VDO_SVDM_VER(header));
+			svdm_version = PD_VDO_SVDM_VER(header);
+		}
+
+		adata->header = VDO(adata->sid, 1, svdm_version, cmd);
+		adata->header |= VDO_OPOS(adata->mode);
+
+		/*
+		 * DP_CMD_CONFIGURE: We can't actually do anything with the
+		 * provided VDO yet so just send back an ACK.
+		 *
+		 * DP_CMD_STATUS_UPDATE: We wait for Mux changes to send
+		 * DPStatus Acks.
+		 */
+		switch (cmd) {
+		case DP_CMD_CONFIGURE:
+			dp_data->data.conf = *data;
+			adata->header |= VDO_CMDT(CMDT_RSP_ACK);
+			dp_data->configured = true;
+			schedule_work(&adata->work);
+			break;
+		case DP_CMD_STATUS_UPDATE:
+			dp_data->pending_status_update = true;
+			break;
+		default:
+			adata->header |= VDO_CMDT(CMDT_RSP_ACK);
+			schedule_work(&adata->work);
+			break;
+		}
+
+		break;
+	default:
+		break;
+	}
+
+	mutex_unlock(&adata->lock);
+	return 0;
+}
+
+static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
+				      const u32 *data, int count)
+{
+	struct cros_typec_altmode_data *adata = typec_altmode_get_drvdata(alt);
+
+	if (!adata->ap_mode_entry)
+		return -EOPNOTSUPP;
+
+	if (adata->sid == USB_TYPEC_DP_SID)
+		return cros_typec_displayport_vdm(alt, header, data, count);
+
+	return -EINVAL;
+}
+
+static const struct typec_altmode_ops cros_typec_altmode_ops = {
+	.enter = cros_typec_altmode_enter,
+	.exit = cros_typec_altmode_exit,
+	.vdm = cros_typec_altmode_vdm,
+};
+
+#if IS_ENABLED(CONFIG_TYPEC_DP_ALTMODE)
+int cros_typec_displayport_status_update(struct typec_altmode *altmode,
+					 struct typec_displayport_data *data)
+{
+	struct cros_typec_dp_data *dp_data =
+		typec_altmode_get_drvdata(altmode);
+	struct cros_typec_altmode_data *adata = &dp_data->adata;
+
+	if (!dp_data->pending_status_update) {
+		dev_dbg(&altmode->dev,
+			"Got DPStatus without a pending request\n");
+		return 0;
+	}
+
+	if (dp_data->configured && dp_data->data.conf != data->conf)
+		dev_dbg(&altmode->dev,
+			"DP Conf doesn't match. Requested 0x%04x, Actual 0x%04x\n",
+			dp_data->data.conf, data->conf);
+
+	mutex_lock(&adata->lock);
+
+	dp_data->data = *data;
+	dp_data->pending_status_update = false;
+	adata->header |= VDO_CMDT(CMDT_RSP_ACK);
+	adata->vdo_data = &dp_data->data.status;
+	adata->vdo_size = 2;
+	schedule_work(&adata->work);
+
+	mutex_unlock(&adata->lock);
+
+	return 0;
+}
+
+struct typec_altmode *
+cros_typec_register_displayport(struct cros_typec_port *port,
+				struct typec_altmode_desc *desc,
+				bool ap_mode_entry)
+{
+	struct typec_altmode *alt;
+	struct cros_typec_dp_data *dp_data;
+	struct cros_typec_altmode_data *adata;
+
+	alt = typec_port_register_altmode(port->port, desc);
+	if (IS_ERR(alt))
+		return alt;
+
+	dp_data = devm_kzalloc(&alt->dev, sizeof(*dp_data), GFP_KERNEL);
+	if (!dp_data) {
+		typec_unregister_altmode(alt);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	adata = &dp_data->adata;
+	INIT_WORK(&adata->work, cros_typec_altmode_work);
+	mutex_init(&adata->lock);
+	adata->alt = alt;
+	adata->port = port;
+	adata->ap_mode_entry = ap_mode_entry;
+	adata->sid = desc->svid;
+	adata->mode = desc->mode;
+
+	typec_altmode_set_ops(alt, &cros_typec_altmode_ops);
+	typec_altmode_set_drvdata(alt, adata);
+
+	return alt;
+}
+#endif
diff --git a/drivers/platform/chrome/cros_typec_altmode.h b/drivers/platform/chrome/cros_typec_altmode.h
new file mode 100644
index 000000000000..ed00ee7a402b
--- /dev/null
+++ b/drivers/platform/chrome/cros_typec_altmode.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __CROS_TYPEC_ALTMODE_H__
+#define __CROS_TYPEC_ALTMODE_H__
+
+#include <linux/kconfig.h>
+#include <linux/usb/typec.h>
+
+struct cros_typec_port;
+struct typec_altmode;
+struct typec_altmode_desc;
+struct typec_displayport_data;
+
+#if IS_ENABLED(CONFIG_TYPEC_DP_ALTMODE)
+struct typec_altmode *
+cros_typec_register_displayport(struct cros_typec_port *port,
+				struct typec_altmode_desc *desc,
+				bool ap_mode_entry);
+
+int cros_typec_displayport_status_update(struct typec_altmode *altmode,
+					 struct typec_displayport_data *data);
+#else
+static inline struct typec_altmode *
+cros_typec_register_displayport(struct cros_typec_port *port,
+				struct typec_altmode_desc *desc,
+				bool ap_mode_entry)
+{
+	return typec_port_register_altmode(port->port, desc);
+}
+
+static inline int cros_typec_displayport_status_update(struct typec_altmode *altmode,
+					 struct typec_displayport_data *data)
+{
+	return 0;
+}
+#endif
+#endif /* __CROS_TYPEC_ALTMODE_H__ */
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 7/8] platform/chrome: cros_ec_typec: Thunderbolt support

[Abhishek Pandit-Subedi]

Add support for entering and exiting Thunderbolt alt-mode using AP
driven alt-mode.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

(no changes since v4)

Changes in v4:
- Update Makefile + Kconfig to use CONFIG_CROS_EC_TYPEC_ALTMODES
- Add locking in vdm function

Changes in v3:
- Fix usage of TBT sid and mode.
- Removed unused vdm operations during altmode registration

Changes in v2:
- Refactored thunderbolt support into cros_typec_altmode.c

 drivers/platform/chrome/Kconfig              |  1 +
 drivers/platform/chrome/cros_ec_typec.c      | 23 ++---
 drivers/platform/chrome/cros_typec_altmode.c | 88 ++++++++++++++++++++
 drivers/platform/chrome/cros_typec_altmode.h | 14 ++++
 4 files changed, 115 insertions(+), 11 deletions(-)

diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 23aa594fbb5b..1b2f2bd09662 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -249,6 +249,7 @@ config CROS_EC_TYPEC
 	depends on USB_ROLE_SWITCH
 	default MFD_CROS_EC_DEV
 	select CROS_EC_TYPEC_ALTMODES if TYPEC_DP_ALTMODE
+	select CROS_EC_TYPEC_ALTMODES if TYPEC_TBT_ALTMODE
 	help
 	  If you say Y here, you get support for accessing Type C connector
 	  information from the Chrome OS EC.
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 1bcaa7269395..1ac5798d887f 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -303,18 +303,19 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
 
 	/*
 	 * Register TBT compatibility alt mode. The EC will not enter the mode
-	 * if it doesn't support it, so it's safe to register it unconditionally
-	 * here for now.
+	 * if it doesn't support it and it will not enter automatically by
+	 * design so we can use the |ap_driven_altmode| feature to check if we
+	 * should register it.
 	 */
-	memset(&desc, 0, sizeof(desc));
-	desc.svid = USB_TYPEC_TBT_SID;
-	desc.mode = TYPEC_ANY_MODE;
-	amode = typec_port_register_altmode(port->port, &desc);
-	if (IS_ERR(amode))
-		return PTR_ERR(amode);
-	port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
-	typec_altmode_set_drvdata(amode, port);
-	amode->ops = &port_amode_ops;
+	if (typec->ap_driven_altmode) {
+		memset(&desc, 0, sizeof(desc));
+		desc.svid = USB_TYPEC_TBT_SID;
+		desc.mode = TBT_MODE;
+		amode = cros_typec_register_thunderbolt(port, &desc);
+		if (IS_ERR(amode))
+			return PTR_ERR(amode);
+		port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
+	}
 
 	port->state.alt = NULL;
 	port->state.mode = TYPEC_STATE_USB;
diff --git a/drivers/platform/chrome/cros_typec_altmode.c b/drivers/platform/chrome/cros_typec_altmode.c
index 6e736168ccc3..557340b53af0 100644
--- a/drivers/platform/chrome/cros_typec_altmode.c
+++ b/drivers/platform/chrome/cros_typec_altmode.c
@@ -10,6 +10,7 @@
 #include <linux/mutex.h>
 #include <linux/workqueue.h>
 #include <linux/usb/typec_dp.h>
+#include <linux/usb/typec_tbt.h>
 #include <linux/usb/pd_vdo.h>
 
 #include "cros_typec_altmode.h"
@@ -72,6 +73,8 @@ static int cros_typec_altmode_enter(struct typec_altmode *alt, u32 *vdo)
 
 	if (adata->sid == USB_TYPEC_DP_SID)
 		req.mode_to_enter = CROS_EC_ALTMODE_DP;
+	else if (adata->sid == USB_TYPEC_TBT_SID)
+		req.mode_to_enter = CROS_EC_ALTMODE_TBT;
 	else
 		return -EOPNOTSUPP;
 
@@ -196,6 +199,56 @@ static int cros_typec_displayport_vdm(struct typec_altmode *alt, u32 header,
 	return 0;
 }
 
+static int cros_typec_thunderbolt_vdm(struct typec_altmode *alt, u32 header,
+				      const u32 *data, int count)
+{
+	struct cros_typec_altmode_data *adata = typec_altmode_get_drvdata(alt);
+
+	int cmd_type = PD_VDO_CMDT(header);
+	int cmd = PD_VDO_CMD(header);
+	int svdm_version;
+
+	svdm_version = typec_altmode_get_svdm_version(alt);
+	if (svdm_version < 0)
+		return svdm_version;
+
+	mutex_lock(&adata->lock);
+
+	switch (cmd_type) {
+	case CMDT_INIT:
+		if (PD_VDO_SVDM_VER(header) < svdm_version) {
+			typec_partner_set_svdm_version(adata->port->partner,
+						       PD_VDO_SVDM_VER(header));
+			svdm_version = PD_VDO_SVDM_VER(header);
+		}
+
+		adata->header = VDO(adata->sid, 1, svdm_version, cmd);
+		adata->header |= VDO_OPOS(adata->mode);
+
+		switch (cmd) {
+		case CMD_ENTER_MODE:
+			/* Don't respond to the enter mode vdm because it
+			 * triggers mux configuration. This is handled directly
+			 * by the cros_ec_typec driver so the Thunderbolt driver
+			 * doesn't need to be involved.
+			 */
+			break;
+		default:
+			adata->header |= VDO_CMDT(CMDT_RSP_ACK);
+			schedule_work(&adata->work);
+			break;
+		}
+
+		break;
+	default:
+		break;
+	}
+
+	mutex_unlock(&adata->lock);
+	return 0;
+}
+
+
 static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
 				      const u32 *data, int count)
 {
@@ -207,6 +260,9 @@ static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
 	if (adata->sid == USB_TYPEC_DP_SID)
 		return cros_typec_displayport_vdm(alt, header, data, count);
 
+	if (adata->sid == USB_TYPEC_TBT_SID)
+		return cros_typec_thunderbolt_vdm(alt, header, data, count);
+
 	return -EINVAL;
 }
 
@@ -283,3 +339,35 @@ cros_typec_register_displayport(struct cros_typec_port *port,
 	return alt;
 }
 #endif
+
+#if IS_ENABLED(CONFIG_TYPEC_TBT_ALTMODE)
+struct typec_altmode *
+cros_typec_register_thunderbolt(struct cros_typec_port *port,
+				struct typec_altmode_desc *desc)
+{
+	struct typec_altmode *alt;
+	struct cros_typec_altmode_data *adata;
+
+	alt = typec_port_register_altmode(port->port, desc);
+	if (IS_ERR(alt))
+		return alt;
+
+	adata = devm_kzalloc(&alt->dev, sizeof(*adata), GFP_KERNEL);
+	if (!adata) {
+		typec_unregister_altmode(alt);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	INIT_WORK(&adata->work, cros_typec_altmode_work);
+	adata->alt = alt;
+	adata->port = port;
+	adata->ap_mode_entry = true;
+	adata->sid = desc->svid;
+	adata->mode = desc->mode;
+
+	typec_altmode_set_ops(alt, &cros_typec_altmode_ops);
+	typec_altmode_set_drvdata(alt, adata);
+
+	return alt;
+}
+#endif
diff --git a/drivers/platform/chrome/cros_typec_altmode.h b/drivers/platform/chrome/cros_typec_altmode.h
index ed00ee7a402b..3f2aa95d065a 100644
--- a/drivers/platform/chrome/cros_typec_altmode.h
+++ b/drivers/platform/chrome/cros_typec_altmode.h
@@ -34,4 +34,18 @@ static inline int cros_typec_displayport_status_update(struct typec_altmode *alt
 	return 0;
 }
 #endif
+
+#if IS_ENABLED(CONFIG_TYPEC_TBT_ALTMODE)
+struct typec_altmode *
+cros_typec_register_thunderbolt(struct cros_typec_port *port,
+				struct typec_altmode_desc *desc);
+#else
+static inline struct typec_altmode *
+cros_typec_register_thunderbolt(struct cros_typec_port *port,
+				struct typec_altmode_desc *desc)
+{
+	return typec_port_register_altmode(port->port, desc);
+}
+#endif
+
 #endif /* __CROS_TYPEC_ALTMODE_H__ */
-- 
2.47.1.613.gc27f4b7a9f-goog

[PATCH v5 8/8] platform/chrome: cros_ec_typec: Disable tbt on port

[Abhishek Pandit-Subedi]

Altmodes with cros_ec are either automatically entered by the EC or
entered by the AP if TBT or USB4 are supported on the system. Due to the
security risk of PCIe tunneling, TBT modes should not be auto entered by
the kernel at this time and will require user intervention.

With this change, a userspace program will need to explicitly activate
the thunderbolt mode on the port and partner in order to enter the mode
and the thunderbolt driver will not automatically enter when a partner
is connected.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

(no changes since v3)

Changes in v3:
- Set port.inactive = true instead of auto-enter.

Changes in v2:
- Only disable auto-enter for Thunderbolt
- Update commit message to clearly indicate the need for userspace
  intervention to enter TBT mode

 drivers/platform/chrome/cros_ec_typec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 1ac5798d887f..6ee182101bc9 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -311,6 +311,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
 		memset(&desc, 0, sizeof(desc));
 		desc.svid = USB_TYPEC_TBT_SID;
 		desc.mode = TBT_MODE;
+		desc.inactive = true;
 		amode = cros_typec_register_thunderbolt(port, &desc);
 		if (IS_ERR(amode))
 			return PTR_ERR(amode);
-- 
2.47.1.613.gc27f4b7a9f-goog

Re: [PATCH v5 6/8] platform/chrome: cros_ec_typec: Displayport support

[Stephen Boyd]

Quoting Abhishek Pandit-Subedi (2024-12-13 15:35:47)
> diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
> index fb8335458a22..1a5a484563cc 100644
> --- a/drivers/platform/chrome/Makefile
> +++ b/drivers/platform/chrome/Makefile
> @@ -19,7 +19,11 @@ obj-$(CONFIG_CROS_EC_SPI)            += cros_ec_spi.o
>  obj-$(CONFIG_CROS_EC_UART)             += cros_ec_uart.o
>  cros_ec_lpcs-objs                      := cros_ec_lpc.o cros_ec_lpc_mec.o
>  cros-ec-typec-objs                     := cros_ec_typec.o cros_typec_vdm.o
> +ifneq ($(CONFIG_CROS_EC_TYPEC_ALTMODES),)
> +       cros-ec-typec-objs              += cros_typec_altmode.o
> +endif

Can this be simplified by collapsing the config in because it is a bool?

	cros-ec-typec-y					:= cros_ec_typec.o cros_typec_vdm.o
	cros-ec-typec-$(CONFIG_CROS_EC_TYPEC_ALTMODES)	+= cros_typec_altmode.o

>  obj-$(CONFIG_CROS_EC_TYPEC)            += cros-ec-typec.o
> +
>  obj-$(CONFIG_CROS_EC_LPC)              += cros_ec_lpcs.o
>  obj-$(CONFIG_CROS_EC_PROTO)            += cros_ec_proto.o cros_ec_trace.o
>  obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT)   += cros_kbd_led_backlight.o
> diff --git a/drivers/platform/chrome/cros_typec_altmode.c b/drivers/platform/chrome/cros_typec_altmode.c
> new file mode 100644
> index 000000000000..6e736168ccc3
> --- /dev/null
> +++ b/drivers/platform/chrome/cros_typec_altmode.c
> @@ -0,0 +1,285 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Alt-mode implementation on ChromeOS EC.
> + *
> + * Copyright 2024 Google LLC
> + * Author: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> + */
> +#include "cros_ec_typec.h"

Please include this after linux headers.

> +
> +#include <linux/mutex.h>
> +#include <linux/workqueue.h>
> +#include <linux/usb/typec_dp.h>
> +#include <linux/usb/pd_vdo.h>
> +
> +#include "cros_typec_altmode.h"
> +

[...]
> +
> +static int cros_typec_displayport_vdm(struct typec_altmode *alt, u32 header,
> +                                     const u32 *data, int count)
> +{
> +       struct cros_typec_dp_data *dp_data = typec_altmode_get_drvdata(alt);
> +       struct cros_typec_altmode_data *adata = &dp_data->adata;
> +
> +

Nitpick: Remove extra newlines.

> +       int cmd_type = PD_VDO_CMDT(header);
> +       int cmd = PD_VDO_CMD(header);
> +       int svdm_version;
> +
> +       svdm_version = typec_altmode_get_svdm_version(alt);
> +       if (svdm_version < 0)
> +               return svdm_version;
> +

Re: [PATCH v5 3/8] usb: typec: Make active on port altmode writable

[Heikki Krogerus]

On Fri, Dec 13, 2024 at 03:35:44PM -0800, Abhishek Pandit-Subedi wrote:
> The active property of port altmode should be writable (to prevent or
> allow partner altmodes from entering) and needs to be part of
> typec_altmode_desc so we can initialize the port to an inactive state if
> desired.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
> 
> Changes in v5:
> - Extract port altmode ".active" changes to its own patch
> 
>  drivers/usb/typec/class.c | 5 +++--
>  include/linux/usb/typec.h | 2 ++
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index febe453b96be..b5e67a57762c 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -458,7 +458,8 @@ static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
>  	struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
>  
>  	if (attr == &dev_attr_active.attr)
> -		if (!adev->ops || !adev->ops->activate)
> +		if (!is_typec_port(adev->dev.parent) &&
> +		    (!adev->ops || !adev->ops->activate))
>  			return 0444;
>  
>  	return attr->mode;
> @@ -563,7 +564,7 @@ typec_register_altmode(struct device *parent,
>  
>  	if (is_port) {
>  		alt->attrs[3] = &dev_attr_supported_roles.attr;
> -		alt->adev.active = true; /* Enabled by default */
> +		alt->adev.active = !desc->inactive; /* Enabled by default */
>  	}
>  
>  	sprintf(alt->group_name, "mode%d", desc->mode);
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index d616b8807000..252af3f77039 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -140,6 +140,7 @@ int typec_cable_set_identity(struct typec_cable *cable);
>   * @mode: Index of the Mode
>   * @vdo: VDO returned by Discover Modes USB PD command
>   * @roles: Only for ports. DRP if the mode is available in both roles
> + * @inactive: Only for ports. Make this port inactive (default is active).
>   *
>   * Description of an Alternate Mode which a connector, cable plug or partner
>   * supports.
> @@ -150,6 +151,7 @@ struct typec_altmode_desc {
>  	u32			vdo;
>  	/* Only used with ports */
>  	enum typec_port_data	roles;
> +	bool			inactive;
>  };
>  
>  void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision);
> -- 
> 2.47.1.613.gc27f4b7a9f-goog

-- 
heikki

Re: [PATCH v5 4/8] usb: typec: Print err when displayport fails to enter

[Heikki Krogerus]

On Fri, Dec 13, 2024 at 03:35:45PM -0800, Abhishek Pandit-Subedi wrote:
> Print the error reason for typec_altmode_enter so users can understand
> why displayport failed to enter.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
> 
> Changes in v5:
> - Put dev_err on single line.
> - Slip clang-format a washington to look the other way.
> 
>  drivers/usb/typec/altmodes/displayport.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index 3245e03d59e6..ac84a6d64c2f 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -252,7 +252,7 @@ static void dp_altmode_work(struct work_struct *work)
>  	case DP_STATE_ENTER:
>  		ret = typec_altmode_enter(dp->alt, NULL);
>  		if (ret && ret != -EBUSY)
> -			dev_err(&dp->alt->dev, "failed to enter mode\n");
> +			dev_err(&dp->alt->dev, "failed to enter mode: %d\n", ret);
>  		break;
>  	case DP_STATE_ENTER_PRIME:
>  		ret = typec_cable_altmode_enter(dp->alt, TYPEC_PLUG_SOP_P, NULL);
> -- 
> 2.47.1.613.gc27f4b7a9f-goog

-- 
heikki

Re: [PATCH v5 1/8] usb: typec: Only use SVID for matching altmodes

[Benson Leung]

[-- Attachment #1: Type: text/plain, Size: 5385 bytes --]

On Fri, Dec 13, 2024 at 03:35:42PM -0800, Abhishek Pandit-Subedi wrote:
> Mode in struct typec_altmode is used to indicate the index of the
> altmode on a port, partner or plug. It is used in enter mode VDMs but
> doesn't make much sense for matching against altmode drivers or for
> matching partner to port altmodes.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>



> ---
> 
> Changes in v5:
> - Rebase with module_alias_printf
> 
> Changes in v3:
> - Removed mode from altmode device ids
> - Updated modalias for typecd bus to remove mode
> - Re-ordered to start of series
> 
> Changes in v2:
> - Update altmode_match to ignore mode entirely
> - Also apply the same behavior to typec_match
> 
>  drivers/usb/typec/altmodes/displayport.c | 2 +-
>  drivers/usb/typec/altmodes/nvidia.c      | 2 +-
>  drivers/usb/typec/bus.c                  | 6 ++----
>  drivers/usb/typec/class.c                | 4 ++--
>  scripts/mod/devicetable-offsets.c        | 1 -
>  scripts/mod/file2alias.c                 | 9 ++-------
>  6 files changed, 8 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index 2f03190a9873..3245e03d59e6 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -791,7 +791,7 @@ void dp_altmode_remove(struct typec_altmode *alt)
>  EXPORT_SYMBOL_GPL(dp_altmode_remove);
>  
>  static const struct typec_device_id dp_typec_id[] = {
> -	{ USB_TYPEC_DP_SID, USB_TYPEC_DP_MODE },
> +	{ USB_TYPEC_DP_SID },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(typec, dp_typec_id);
> diff --git a/drivers/usb/typec/altmodes/nvidia.c b/drivers/usb/typec/altmodes/nvidia.c
> index fe70b36f078f..2b77d931e494 100644
> --- a/drivers/usb/typec/altmodes/nvidia.c
> +++ b/drivers/usb/typec/altmodes/nvidia.c
> @@ -24,7 +24,7 @@ static void nvidia_altmode_remove(struct typec_altmode *alt)
>  }
>  
>  static const struct typec_device_id nvidia_typec_id[] = {
> -	{ USB_TYPEC_NVIDIA_VLINK_SID, TYPEC_ANY_MODE },
> +	{ USB_TYPEC_NVIDIA_VLINK_SID },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(typec, nvidia_typec_id);
> diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
> index aa879253d3b8..ae90688d23e4 100644
> --- a/drivers/usb/typec/bus.c
> +++ b/drivers/usb/typec/bus.c
> @@ -454,8 +454,7 @@ static int typec_match(struct device *dev, const struct device_driver *driver)
>  	const struct typec_device_id *id;
>  
>  	for (id = drv->id_table; id->svid; id++)
> -		if (id->svid == altmode->svid &&
> -		    (id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
> +		if (id->svid == altmode->svid)
>  			return 1;
>  	return 0;
>  }
> @@ -470,8 +469,7 @@ static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
>  	if (add_uevent_var(env, "MODE=%u", altmode->mode))
>  		return -ENOMEM;
>  
> -	return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
> -			      altmode->svid, altmode->mode);
> +	return add_uevent_var(env, "MODALIAS=typec:id%04X", altmode->svid);
>  }
>  
>  static int typec_altmode_create_links(struct altmode *alt)
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 4b3047e055a3..febe453b96be 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -237,13 +237,13 @@ static int altmode_match(struct device *dev, void *data)
>  	if (!is_typec_altmode(dev))
>  		return 0;
>  
> -	return ((adev->svid == id->svid) && (adev->mode == id->mode));
> +	return (adev->svid == id->svid);
>  }
>  
>  static void typec_altmode_set_partner(struct altmode *altmode)
>  {
>  	struct typec_altmode *adev = &altmode->adev;
> -	struct typec_device_id id = { adev->svid, adev->mode, };
> +	struct typec_device_id id = { adev->svid };
>  	struct typec_port *port = typec_altmode2port(adev);
>  	struct altmode *partner;
>  	struct device *dev;
> diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
> index 9c7b404defbd..d3d00e85edf7 100644
> --- a/scripts/mod/devicetable-offsets.c
> +++ b/scripts/mod/devicetable-offsets.c
> @@ -237,7 +237,6 @@ int main(void)
>  
>  	DEVID(typec_device_id);
>  	DEVID_FIELD(typec_device_id, svid);
> -	DEVID_FIELD(typec_device_id, mode);
>  
>  	DEVID(tee_client_device_id);
>  	DEVID_FIELD(tee_client_device_id, uuid);
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 5b5745f00eb3..7049c31062c6 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -1221,17 +1221,12 @@ static void do_tbsvc_entry(struct module *mod, void *symval)
>  	module_alias_printf(mod, true, "tbsvc:%s", alias);
>  }
>  
> -/* Looks like: typec:idNmN */
> +/* Looks like: typec:idN */
>  static void do_typec_entry(struct module *mod, void *symval)
>  {
> -	char alias[256] = {};
> -
>  	DEF_FIELD(symval, typec_device_id, svid);
> -	DEF_FIELD(symval, typec_device_id, mode);
> -
> -	ADD(alias, "m", mode != TYPEC_ANY_MODE, mode);
>  
> -	module_alias_printf(mod, false, "typec:id%04X%s", svid, alias);
> +	module_alias_printf(mod, false, "typec:id%04X", svid);
>  }
>  
>  /* Looks like: tee:uuid */
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 
> 

[-- Attachment #2: signature.asc --]
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Re: [PATCH v5 2/8] usb: typec: Add driver for Thunderbolt 3 Alternate Mode

[Benson Leung]

[-- Attachment #1: Type: text/plain, Size: 14361 bytes --]

On Fri, Dec 13, 2024 at 03:35:43PM -0800, Abhishek Pandit-Subedi wrote:
> From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> 
> Thunderbolt 3 Alternate Mode entry flow is described in
> USB Type-C Specification Release 2.0.
> 
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Co-developed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>

> ---
> 
> Changes in v5:
> - Add lockdep, missing includes and fix up block comment style.
> 
> Changes in v4:
> - Large refactor to use cable_altmodes
> - Fixed ordering of cable mode enter/exit (SOP', SOP", then port for
>   enter; reverse order for exit)
> - Other small fixes from v3 feedback
> 
> Changes in v3:
> - Revert rename of TYPEC_TBT_MODE
> - Remove mode from typec_device_id
> 
> 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
> 
> Changes in v1:
> - Delay cable + plug checks so that the module doesn't fail to probe
>   if cable + plug information isn't available by the time the partner
>   altmode is registered.
> - Remove unncessary brace after if (IS_ERR(plug))
> 
>  drivers/usb/typec/altmodes/Kconfig       |   9 +
>  drivers/usb/typec/altmodes/Makefile      |   2 +
>  drivers/usb/typec/altmodes/thunderbolt.c | 388 +++++++++++++++++++++++
>  include/linux/usb/typec_tbt.h            |   1 +
>  4 files changed, 400 insertions(+)
>  create mode 100644 drivers/usb/typec/altmodes/thunderbolt.c
> 
> diff --git a/drivers/usb/typec/altmodes/Kconfig b/drivers/usb/typec/altmodes/Kconfig
> index 1a6b5e872b0d..7867fa7c405d 100644
> --- a/drivers/usb/typec/altmodes/Kconfig
> +++ b/drivers/usb/typec/altmodes/Kconfig
> @@ -23,4 +23,13 @@ config TYPEC_NVIDIA_ALTMODE
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called typec_nvidia.
>  
> +config TYPEC_TBT_ALTMODE
> +	tristate "Thunderbolt3 Alternate Mode driver"
> +	help
> +	  Select this option if you have Thunderbolt3 hardware on your
> +	  system.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called typec_thunderbolt.
> +
>  endmenu
> diff --git a/drivers/usb/typec/altmodes/Makefile b/drivers/usb/typec/altmodes/Makefile
> index 45717548b396..508a68351bd2 100644
> --- a/drivers/usb/typec/altmodes/Makefile
> +++ b/drivers/usb/typec/altmodes/Makefile
> @@ -4,3 +4,5 @@ obj-$(CONFIG_TYPEC_DP_ALTMODE)		+= typec_displayport.o
>  typec_displayport-y			:= displayport.o
>  obj-$(CONFIG_TYPEC_NVIDIA_ALTMODE)	+= typec_nvidia.o
>  typec_nvidia-y				:= nvidia.o
> +obj-$(CONFIG_TYPEC_TBT_ALTMODE)		+= typec_thunderbolt.o
> +typec_thunderbolt-y			:= thunderbolt.o
> diff --git a/drivers/usb/typec/altmodes/thunderbolt.c b/drivers/usb/typec/altmodes/thunderbolt.c
> new file mode 100644
> index 000000000000..1b475b1d98e7
> --- /dev/null
> +++ b/drivers/usb/typec/altmodes/thunderbolt.c
> @@ -0,0 +1,388 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * USB Typec-C Thunderbolt3 Alternate Mode driver
> + *
> + * Copyright (C) 2019 Intel Corporation
> + * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> + */
> +
> +#include <linux/lockdep.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/workqueue.h>
> +#include <linux/usb/pd_vdo.h>
> +#include <linux/usb/typec_altmode.h>
> +#include <linux/usb/typec_tbt.h>
> +
> +enum tbt_state {
> +	TBT_STATE_IDLE,
> +	TBT_STATE_SOP_P_ENTER,
> +	TBT_STATE_SOP_PP_ENTER,
> +	TBT_STATE_ENTER,
> +	TBT_STATE_EXIT,
> +	TBT_STATE_SOP_PP_EXIT,
> +	TBT_STATE_SOP_P_EXIT
> +};
> +
> +struct tbt_altmode {
> +	enum tbt_state state;
> +	struct typec_cable *cable;
> +	struct typec_altmode *alt;
> +	struct typec_altmode *plug[2];
> +	u32 enter_vdo;
> +
> +	struct work_struct work;
> +	struct mutex lock; /* device lock */
> +};
> +
> +static bool tbt_ready(struct typec_altmode *alt);
> +
> +static int tbt_enter_mode(struct tbt_altmode *tbt)
> +{
> +	struct typec_altmode *plug = tbt->plug[TYPEC_PLUG_SOP_P];
> +	u32 vdo;
> +
> +	vdo = tbt->alt->vdo & (TBT_VENDOR_SPECIFIC_B0 | TBT_VENDOR_SPECIFIC_B1);
> +	vdo |= tbt->alt->vdo & TBT_INTEL_SPECIFIC_B0;
> +	vdo |= TBT_MODE;
> +
> +	if (plug) {
> +		if (typec_cable_is_active(tbt->cable))
> +			vdo |= TBT_ENTER_MODE_ACTIVE_CABLE;
> +
> +		vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_SPEED(plug->vdo));
> +		vdo |= plug->vdo & TBT_CABLE_ROUNDED;
> +		vdo |= plug->vdo & TBT_CABLE_OPTICAL;
> +		vdo |= plug->vdo & TBT_CABLE_RETIMER;
> +		vdo |= plug->vdo & TBT_CABLE_LINK_TRAINING;
> +	} else {
> +		vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_USB3_PASSIVE);
> +	}
> +
> +	tbt->enter_vdo = vdo;
> +	return typec_altmode_enter(tbt->alt, &vdo);
> +}
> +
> +static void tbt_altmode_work(struct work_struct *work)
> +{
> +	struct tbt_altmode *tbt = container_of(work, struct tbt_altmode, work);
> +	int ret;
> +
> +	mutex_lock(&tbt->lock);
> +
> +	switch (tbt->state) {
> +	case TBT_STATE_SOP_P_ENTER:
> +		ret = typec_cable_altmode_enter(tbt->alt, TYPEC_PLUG_SOP_P, NULL);
> +		if (ret) {
> +			dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_P]->dev,
> +				"failed to enter mode (%d)\n", ret);
> +			goto disable_plugs;
> +		}
> +		break;
> +	case TBT_STATE_SOP_PP_ENTER:
> +		ret = typec_cable_altmode_enter(tbt->alt, TYPEC_PLUG_SOP_PP,  NULL);
> +		if (ret) {
> +			dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_PP]->dev,
> +				"failed to enter mode (%d)\n", ret);
> +			goto disable_plugs;
> +		}
> +		break;
> +	case TBT_STATE_ENTER:
> +		ret = tbt_enter_mode(tbt);
> +		if (ret)
> +			dev_dbg(&tbt->alt->dev, "failed to enter mode (%d)\n",
> +				ret);
> +		break;
> +	case TBT_STATE_EXIT:
> +		typec_altmode_exit(tbt->alt);
> +		break;
> +	case TBT_STATE_SOP_PP_EXIT:
> +		typec_cable_altmode_exit(tbt->alt, TYPEC_PLUG_SOP_PP);
> +		break;
> +	case TBT_STATE_SOP_P_EXIT:
> +		typec_cable_altmode_exit(tbt->alt, TYPEC_PLUG_SOP_P);
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	tbt->state = TBT_STATE_IDLE;
> +
> +	mutex_unlock(&tbt->lock);
> +	return;
> +
> +disable_plugs:
> +	for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
> +		if (tbt->plug[i])
> +			typec_altmode_put_plug(tbt->plug[i]);
> +
> +		tbt->plug[i] = NULL;
> +	}
> +
> +	tbt->state = TBT_STATE_ENTER;
> +	schedule_work(&tbt->work);
> +	mutex_unlock(&tbt->lock);
> +}
> +
> +/*
> + * If SOP' is available, enter that first (which will trigger a VDM response
> + * that will enter SOP" if available and then the port). If entering SOP' fails,
> + * stop attempting to enter either cable altmode (probably not supported) and
> + * directly enter the port altmode.
> + */
> +static int tbt_enter_modes_ordered(struct typec_altmode *alt)
> +{
> +	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +	int ret = 0;
> +
> +	lockdep_assert_held(&tbt->lock);
> +
> +	if (!tbt_ready(tbt->alt))
> +		return -ENODEV;
> +
> +	if (tbt->plug[TYPEC_PLUG_SOP_P]) {
> +		ret = typec_cable_altmode_enter(alt, TYPEC_PLUG_SOP_P, NULL);
> +		if (ret < 0) {
> +			for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
> +				if (tbt->plug[i])
> +					typec_altmode_put_plug(tbt->plug[i]);
> +
> +				tbt->plug[i] = NULL;
> +			}
> +		} else {
> +			return ret;
> +		}
> +	}
> +
> +	return tbt_enter_mode(tbt);
> +}
> +
> +static int tbt_cable_altmode_vdm(struct typec_altmode *alt,
> +				 enum typec_plug_index sop, const u32 hdr,
> +				 const u32 *vdo, int count)
> +{
> +	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +	int cmd_type = PD_VDO_CMDT(hdr);
> +	int cmd = PD_VDO_CMD(hdr);
> +
> +	mutex_lock(&tbt->lock);
> +
> +	if (tbt->state != TBT_STATE_IDLE) {
> +		mutex_unlock(&tbt->lock);
> +		return -EBUSY;
> +	}
> +
> +	switch (cmd_type) {
> +	case CMDT_RSP_ACK:
> +		switch (cmd) {
> +		case CMD_ENTER_MODE:
> +			/*
> +			 * Following the order described in USB Type-C Spec
> +			 * R2.0 Section 6.7.3: SOP', SOP", then port.
> +			 */
> +			if (sop == TYPEC_PLUG_SOP_P) {
> +				if (tbt->plug[TYPEC_PLUG_SOP_PP])
> +					tbt->state = TBT_STATE_SOP_PP_ENTER;
> +				else
> +					tbt->state = TBT_STATE_ENTER;
> +			} else if (sop == TYPEC_PLUG_SOP_PP)
> +				tbt->state = TBT_STATE_ENTER;
> +
> +			break;
> +		case CMD_EXIT_MODE:
> +			/* Exit in opposite order: Port, SOP", then SOP'. */
> +			if (sop == TYPEC_PLUG_SOP_PP)
> +				tbt->state = TBT_STATE_SOP_P_EXIT;
> +			break;
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	if (tbt->state != TBT_STATE_IDLE)
> +		schedule_work(&tbt->work);
> +
> +	mutex_unlock(&tbt->lock);
> +	return 0;
> +}
> +
> +static int tbt_altmode_vdm(struct typec_altmode *alt,
> +			   const u32 hdr, const u32 *vdo, int count)
> +{
> +	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +	struct typec_thunderbolt_data data;
> +	int cmd_type = PD_VDO_CMDT(hdr);
> +	int cmd = PD_VDO_CMD(hdr);
> +
> +	mutex_lock(&tbt->lock);
> +
> +	if (tbt->state != TBT_STATE_IDLE) {
> +		mutex_unlock(&tbt->lock);
> +		return -EBUSY;
> +	}
> +
> +	switch (cmd_type) {
> +	case CMDT_RSP_ACK:
> +		/* Port altmode is last to enter and first to exit. */
> +		switch (cmd) {
> +		case CMD_ENTER_MODE:
> +			memset(&data, 0, sizeof(data));
> +
> +			data.device_mode = tbt->alt->vdo;
> +			data.enter_vdo = tbt->enter_vdo;
> +			if (tbt->plug[TYPEC_PLUG_SOP_P])
> +				data.cable_mode = tbt->plug[TYPEC_PLUG_SOP_P]->vdo;
> +
> +			typec_altmode_notify(alt, TYPEC_STATE_MODAL, &data);
> +			break;
> +		case CMD_EXIT_MODE:
> +			if (tbt->plug[TYPEC_PLUG_SOP_PP])
> +				tbt->state = TBT_STATE_SOP_PP_EXIT;
> +			else if (tbt->plug[TYPEC_PLUG_SOP_P])
> +				tbt->state = TBT_STATE_SOP_P_EXIT;
> +			break;
> +		}
> +		break;
> +	case CMDT_RSP_NAK:
> +		switch (cmd) {
> +		case CMD_ENTER_MODE:
> +			dev_warn(&alt->dev, "Enter Mode refused\n");
> +			break;
> +		default:
> +			break;
> +		}
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	if (tbt->state != TBT_STATE_IDLE)
> +		schedule_work(&tbt->work);
> +
> +	mutex_unlock(&tbt->lock);
> +
> +	return 0;
> +}
> +
> +static int tbt_altmode_activate(struct typec_altmode *alt, int activate)
> +{
> +	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +	int ret;
> +
> +	mutex_lock(&tbt->lock);
> +
> +	if (activate)
> +		ret = tbt_enter_modes_ordered(alt);
> +	else
> +		ret = typec_altmode_exit(alt);
> +
> +	mutex_unlock(&tbt->lock);
> +
> +	return ret;
> +}
> +
> +static const struct typec_altmode_ops tbt_altmode_ops = {
> +	.vdm		= tbt_altmode_vdm,
> +	.activate	= tbt_altmode_activate
> +};
> +
> +static const struct typec_cable_ops tbt_cable_ops = {
> +	.vdm		= tbt_cable_altmode_vdm,
> +};
> +
> +static int tbt_altmode_probe(struct typec_altmode *alt)
> +{
> +	struct tbt_altmode *tbt;
> +
> +	tbt = devm_kzalloc(&alt->dev, sizeof(*tbt), GFP_KERNEL);
> +	if (!tbt)
> +		return -ENOMEM;
> +
> +	INIT_WORK(&tbt->work, tbt_altmode_work);
> +	mutex_init(&tbt->lock);
> +	tbt->alt = alt;
> +
> +	alt->desc = "Thunderbolt3";
> +	typec_altmode_set_drvdata(alt, tbt);
> +	typec_altmode_set_ops(alt, &tbt_altmode_ops);
> +
> +	if (tbt_ready(alt)) {
> +		if (tbt->plug[TYPEC_PLUG_SOP_P])
> +			tbt->state = TBT_STATE_SOP_P_ENTER;
> +		else if (tbt->plug[TYPEC_PLUG_SOP_PP])
> +			tbt->state = TBT_STATE_SOP_PP_ENTER;
> +		else
> +			tbt->state = TBT_STATE_ENTER;
> +		schedule_work(&tbt->work);
> +	}
> +
> +	return 0;
> +}
> +
> +static void tbt_altmode_remove(struct typec_altmode *alt)
> +{
> +	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +
> +	for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
> +		if (tbt->plug[i])
> +			typec_altmode_put_plug(tbt->plug[i]);
> +	}
> +
> +	if (tbt->cable)
> +		typec_cable_put(tbt->cable);
> +}
> +
> +static bool tbt_ready(struct typec_altmode *alt)
> +{
> +	struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +	struct typec_altmode *plug;
> +
> +	if (tbt->cable)
> +		return true;
> +
> +	/* Thunderbolt 3 requires a cable with eMarker */
> +	tbt->cable = typec_cable_get(typec_altmode2port(tbt->alt));
> +	if (!tbt->cable)
> +		return false;
> +
> +	/* We accept systems without SOP' or SOP''. This means the port altmode
> +	 * driver will be responsible for properly ordering entry/exit.
> +	 */
> +	for (int i = 0; i < TYPEC_PLUG_SOP_PP + 1; i++) {
> +		plug = typec_altmode_get_plug(tbt->alt, i);
> +		if (IS_ERR(plug))
> +			continue;
> +
> +		if (!plug || plug->svid != USB_TYPEC_TBT_SID)
> +			break;
> +
> +		plug->desc = "Thunderbolt3";
> +		plug->cable_ops = &tbt_cable_ops;
> +		typec_altmode_set_drvdata(plug, tbt);
> +
> +		tbt->plug[i] = plug;
> +	}
> +
> +	return true;
> +}
> +
> +static const struct typec_device_id tbt_typec_id[] = {
> +	{ USB_TYPEC_TBT_SID },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(typec, tbt_typec_id);
> +
> +static struct typec_altmode_driver tbt_altmode_driver = {
> +	.id_table = tbt_typec_id,
> +	.probe = tbt_altmode_probe,
> +	.remove = tbt_altmode_remove,
> +	.driver = {
> +		.name = "typec-thunderbolt",
> +	}
> +};
> +module_typec_altmode_driver(tbt_altmode_driver);
> +
> +MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("Thunderbolt3 USB Type-C Alternate Mode");
> diff --git a/include/linux/usb/typec_tbt.h b/include/linux/usb/typec_tbt.h
> index fa97d7e00f5c..55dcea12082c 100644
> --- a/include/linux/usb/typec_tbt.h
> +++ b/include/linux/usb/typec_tbt.h
> @@ -44,6 +44,7 @@ struct typec_thunderbolt_data {
>  
>  #define   TBT_GEN3_NON_ROUNDED                 0
>  #define   TBT_GEN3_GEN4_ROUNDED_NON_ROUNDED    1
> +#define TBT_CABLE_ROUNDED		BIT(19)
>  #define TBT_CABLE_OPTICAL		BIT(21)
>  #define TBT_CABLE_RETIMER		BIT(22)
>  #define TBT_CABLE_LINK_TRAINING		BIT(23)
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 
> 

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Re: [PATCH v5 3/8] usb: typec: Make active on port altmode writable

[Benson Leung]

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On Fri, Dec 13, 2024 at 03:35:44PM -0800, Abhishek Pandit-Subedi wrote:
> The active property of port altmode should be writable (to prevent or
> allow partner altmodes from entering) and needs to be part of
> typec_altmode_desc so we can initialize the port to an inactive state if
> desired.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>

> ---
> 
> Changes in v5:
> - Extract port altmode ".active" changes to its own patch
> 
>  drivers/usb/typec/class.c | 5 +++--
>  include/linux/usb/typec.h | 2 ++
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index febe453b96be..b5e67a57762c 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -458,7 +458,8 @@ static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
>  	struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
>  
>  	if (attr == &dev_attr_active.attr)
> -		if (!adev->ops || !adev->ops->activate)
> +		if (!is_typec_port(adev->dev.parent) &&
> +		    (!adev->ops || !adev->ops->activate))
>  			return 0444;
>  
>  	return attr->mode;
> @@ -563,7 +564,7 @@ typec_register_altmode(struct device *parent,
>  
>  	if (is_port) {
>  		alt->attrs[3] = &dev_attr_supported_roles.attr;
> -		alt->adev.active = true; /* Enabled by default */
> +		alt->adev.active = !desc->inactive; /* Enabled by default */
>  	}
>  
>  	sprintf(alt->group_name, "mode%d", desc->mode);
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index d616b8807000..252af3f77039 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -140,6 +140,7 @@ int typec_cable_set_identity(struct typec_cable *cable);
>   * @mode: Index of the Mode
>   * @vdo: VDO returned by Discover Modes USB PD command
>   * @roles: Only for ports. DRP if the mode is available in both roles
> + * @inactive: Only for ports. Make this port inactive (default is active).
>   *
>   * Description of an Alternate Mode which a connector, cable plug or partner
>   * supports.
> @@ -150,6 +151,7 @@ struct typec_altmode_desc {
>  	u32			vdo;
>  	/* Only used with ports */
>  	enum typec_port_data	roles;
> +	bool			inactive;
>  };
>  
>  void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision);
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 
> 

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Re: [PATCH v5 1/8] usb: typec: Only use SVID for matching altmodes

[Benson Leung]

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On Fri, Dec 13, 2024 at 03:35:42PM -0800, Abhishek Pandit-Subedi wrote:
> Mode in struct typec_altmode is used to indicate the index of the
> altmode on a port, partner or plug. It is used in enter mode VDMs but
> doesn't make much sense for matching against altmode drivers or for
> matching partner to port altmodes.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

Reviewed-by: Benson Leung <bleung@chromium.org>

> ---
> 
> Changes in v5:
> - Rebase with module_alias_printf
> 
> Changes in v3:
> - Removed mode from altmode device ids
> - Updated modalias for typecd bus to remove mode
> - Re-ordered to start of series
> 
> Changes in v2:
> - Update altmode_match to ignore mode entirely
> - Also apply the same behavior to typec_match
> 
>  drivers/usb/typec/altmodes/displayport.c | 2 +-
>  drivers/usb/typec/altmodes/nvidia.c      | 2 +-
>  drivers/usb/typec/bus.c                  | 6 ++----
>  drivers/usb/typec/class.c                | 4 ++--
>  scripts/mod/devicetable-offsets.c        | 1 -
>  scripts/mod/file2alias.c                 | 9 ++-------
>  6 files changed, 8 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index 2f03190a9873..3245e03d59e6 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -791,7 +791,7 @@ void dp_altmode_remove(struct typec_altmode *alt)
>  EXPORT_SYMBOL_GPL(dp_altmode_remove);
>  
>  static const struct typec_device_id dp_typec_id[] = {
> -	{ USB_TYPEC_DP_SID, USB_TYPEC_DP_MODE },
> +	{ USB_TYPEC_DP_SID },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(typec, dp_typec_id);
> diff --git a/drivers/usb/typec/altmodes/nvidia.c b/drivers/usb/typec/altmodes/nvidia.c
> index fe70b36f078f..2b77d931e494 100644
> --- a/drivers/usb/typec/altmodes/nvidia.c
> +++ b/drivers/usb/typec/altmodes/nvidia.c
> @@ -24,7 +24,7 @@ static void nvidia_altmode_remove(struct typec_altmode *alt)
>  }
>  
>  static const struct typec_device_id nvidia_typec_id[] = {
> -	{ USB_TYPEC_NVIDIA_VLINK_SID, TYPEC_ANY_MODE },
> +	{ USB_TYPEC_NVIDIA_VLINK_SID },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(typec, nvidia_typec_id);
> diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
> index aa879253d3b8..ae90688d23e4 100644
> --- a/drivers/usb/typec/bus.c
> +++ b/drivers/usb/typec/bus.c
> @@ -454,8 +454,7 @@ static int typec_match(struct device *dev, const struct device_driver *driver)
>  	const struct typec_device_id *id;
>  
>  	for (id = drv->id_table; id->svid; id++)
> -		if (id->svid == altmode->svid &&
> -		    (id->mode == TYPEC_ANY_MODE || id->mode == altmode->mode))
> +		if (id->svid == altmode->svid)
>  			return 1;
>  	return 0;
>  }
> @@ -470,8 +469,7 @@ static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
>  	if (add_uevent_var(env, "MODE=%u", altmode->mode))
>  		return -ENOMEM;
>  
> -	return add_uevent_var(env, "MODALIAS=typec:id%04Xm%02X",
> -			      altmode->svid, altmode->mode);
> +	return add_uevent_var(env, "MODALIAS=typec:id%04X", altmode->svid);
>  }
>  
>  static int typec_altmode_create_links(struct altmode *alt)
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 4b3047e055a3..febe453b96be 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -237,13 +237,13 @@ static int altmode_match(struct device *dev, void *data)
>  	if (!is_typec_altmode(dev))
>  		return 0;
>  
> -	return ((adev->svid == id->svid) && (adev->mode == id->mode));
> +	return (adev->svid == id->svid);
>  }
>  
>  static void typec_altmode_set_partner(struct altmode *altmode)
>  {
>  	struct typec_altmode *adev = &altmode->adev;
> -	struct typec_device_id id = { adev->svid, adev->mode, };
> +	struct typec_device_id id = { adev->svid };
>  	struct typec_port *port = typec_altmode2port(adev);
>  	struct altmode *partner;
>  	struct device *dev;
> diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
> index 9c7b404defbd..d3d00e85edf7 100644
> --- a/scripts/mod/devicetable-offsets.c
> +++ b/scripts/mod/devicetable-offsets.c
> @@ -237,7 +237,6 @@ int main(void)
>  
>  	DEVID(typec_device_id);
>  	DEVID_FIELD(typec_device_id, svid);
> -	DEVID_FIELD(typec_device_id, mode);
>  
>  	DEVID(tee_client_device_id);
>  	DEVID_FIELD(tee_client_device_id, uuid);
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 5b5745f00eb3..7049c31062c6 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -1221,17 +1221,12 @@ static void do_tbsvc_entry(struct module *mod, void *symval)
>  	module_alias_printf(mod, true, "tbsvc:%s", alias);
>  }
>  
> -/* Looks like: typec:idNmN */
> +/* Looks like: typec:idN */
>  static void do_typec_entry(struct module *mod, void *symval)
>  {
> -	char alias[256] = {};
> -
>  	DEF_FIELD(symval, typec_device_id, svid);
> -	DEF_FIELD(symval, typec_device_id, mode);
> -
> -	ADD(alias, "m", mode != TYPEC_ANY_MODE, mode);
>  
> -	module_alias_printf(mod, false, "typec:id%04X%s", svid, alias);
> +	module_alias_printf(mod, false, "typec:id%04X", svid);
>  }
>  
>  /* Looks like: tee:uuid */
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 
> 

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Re: [PATCH v5 4/8] usb: typec: Print err when displayport fails to enter

[Benson Leung]

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On Fri, Dec 13, 2024 at 03:35:45PM -0800, Abhishek Pandit-Subedi wrote:
> Print the error reason for typec_altmode_enter so users can understand
> why displayport failed to enter.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>

> ---
> 
> Changes in v5:
> - Put dev_err on single line.
> - Slip clang-format a washington to look the other way.
> 
>  drivers/usb/typec/altmodes/displayport.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index 3245e03d59e6..ac84a6d64c2f 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -252,7 +252,7 @@ static void dp_altmode_work(struct work_struct *work)
>  	case DP_STATE_ENTER:
>  		ret = typec_altmode_enter(dp->alt, NULL);
>  		if (ret && ret != -EBUSY)
> -			dev_err(&dp->alt->dev, "failed to enter mode\n");
> +			dev_err(&dp->alt->dev, "failed to enter mode: %d\n", ret);
>  		break;
>  	case DP_STATE_ENTER_PRIME:
>  		ret = typec_cable_altmode_enter(dp->alt, TYPEC_PLUG_SOP_P, NULL);
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 
> 

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Re: [PATCH v5 5/8] platform/chrome: cros_ec_typec: Update partner altmode active

[Benson Leung]

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On Fri, Dec 13, 2024 at 03:35:46PM -0800, Abhishek Pandit-Subedi wrote:
> Mux configuration is often the final piece of mode entry and can be used
> to determine whether a partner altmode is active. When mux configuration
> is done, use the active port altmode's SVID to set the partner active
> field for all partner alt modes.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>

> ---
> 
> Changes in v5:
> - Use list_for_each_entry and simplify conditional statement within
> 
>  drivers/platform/chrome/cros_ec_typec.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index ae2f86296954..77f748fc8542 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -619,6 +619,7 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
>  	};
>  	struct ec_params_usb_pd_mux_ack mux_ack;
>  	enum typec_orientation orientation;
> +	struct cros_typec_altmode_node *node;
>  	int ret;
>  
>  	ret = cros_ec_cmd(typec->ec, 0, EC_CMD_USB_PD_MUX_INFO,
> @@ -677,6 +678,14 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
>  			port->mux_flags);
>  	}
>  
> +	/* Iterate all partner alt-modes and set the active alternate mode. */
> +	list_for_each_entry(node, &port->partner_mode_list, list) {
> +		typec_altmode_update_active(
> +			node->amode,
> +			port->state.alt &&
> +				node->amode->svid == port->state.alt->svid);
> +	}
> +
>  mux_ack:
>  	if (!typec->needs_mux_ack)
>  		return ret;
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 

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Re: [PATCH v5 7/8] platform/chrome: cros_ec_typec: Thunderbolt support

[Benson Leung]

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On Fri, Dec 13, 2024 at 03:35:48PM -0800, Abhishek Pandit-Subedi wrote:
> Add support for entering and exiting Thunderbolt alt-mode using AP
> driven alt-mode.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>

> ---
> 
> (no changes since v4)
> 
> Changes in v4:
> - Update Makefile + Kconfig to use CONFIG_CROS_EC_TYPEC_ALTMODES
> - Add locking in vdm function
> 
> Changes in v3:
> - Fix usage of TBT sid and mode.
> - Removed unused vdm operations during altmode registration
> 
> Changes in v2:
> - Refactored thunderbolt support into cros_typec_altmode.c
> 
>  drivers/platform/chrome/Kconfig              |  1 +
>  drivers/platform/chrome/cros_ec_typec.c      | 23 ++---
>  drivers/platform/chrome/cros_typec_altmode.c | 88 ++++++++++++++++++++
>  drivers/platform/chrome/cros_typec_altmode.h | 14 ++++
>  4 files changed, 115 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
> index 23aa594fbb5b..1b2f2bd09662 100644
> --- a/drivers/platform/chrome/Kconfig
> +++ b/drivers/platform/chrome/Kconfig
> @@ -249,6 +249,7 @@ config CROS_EC_TYPEC
>  	depends on USB_ROLE_SWITCH
>  	default MFD_CROS_EC_DEV
>  	select CROS_EC_TYPEC_ALTMODES if TYPEC_DP_ALTMODE
> +	select CROS_EC_TYPEC_ALTMODES if TYPEC_TBT_ALTMODE
>  	help
>  	  If you say Y here, you get support for accessing Type C connector
>  	  information from the Chrome OS EC.
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index 1bcaa7269395..1ac5798d887f 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -303,18 +303,19 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>  
>  	/*
>  	 * Register TBT compatibility alt mode. The EC will not enter the mode
> -	 * if it doesn't support it, so it's safe to register it unconditionally
> -	 * here for now.
> +	 * if it doesn't support it and it will not enter automatically by
> +	 * design so we can use the |ap_driven_altmode| feature to check if we
> +	 * should register it.
>  	 */
> -	memset(&desc, 0, sizeof(desc));
> -	desc.svid = USB_TYPEC_TBT_SID;
> -	desc.mode = TYPEC_ANY_MODE;
> -	amode = typec_port_register_altmode(port->port, &desc);
> -	if (IS_ERR(amode))
> -		return PTR_ERR(amode);
> -	port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
> -	typec_altmode_set_drvdata(amode, port);
> -	amode->ops = &port_amode_ops;
> +	if (typec->ap_driven_altmode) {
> +		memset(&desc, 0, sizeof(desc));
> +		desc.svid = USB_TYPEC_TBT_SID;
> +		desc.mode = TBT_MODE;
> +		amode = cros_typec_register_thunderbolt(port, &desc);
> +		if (IS_ERR(amode))
> +			return PTR_ERR(amode);
> +		port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
> +	}
>  
>  	port->state.alt = NULL;
>  	port->state.mode = TYPEC_STATE_USB;
> diff --git a/drivers/platform/chrome/cros_typec_altmode.c b/drivers/platform/chrome/cros_typec_altmode.c
> index 6e736168ccc3..557340b53af0 100644
> --- a/drivers/platform/chrome/cros_typec_altmode.c
> +++ b/drivers/platform/chrome/cros_typec_altmode.c
> @@ -10,6 +10,7 @@
>  #include <linux/mutex.h>
>  #include <linux/workqueue.h>
>  #include <linux/usb/typec_dp.h>
> +#include <linux/usb/typec_tbt.h>
>  #include <linux/usb/pd_vdo.h>
>  
>  #include "cros_typec_altmode.h"
> @@ -72,6 +73,8 @@ static int cros_typec_altmode_enter(struct typec_altmode *alt, u32 *vdo)
>  
>  	if (adata->sid == USB_TYPEC_DP_SID)
>  		req.mode_to_enter = CROS_EC_ALTMODE_DP;
> +	else if (adata->sid == USB_TYPEC_TBT_SID)
> +		req.mode_to_enter = CROS_EC_ALTMODE_TBT;
>  	else
>  		return -EOPNOTSUPP;
>  
> @@ -196,6 +199,56 @@ static int cros_typec_displayport_vdm(struct typec_altmode *alt, u32 header,
>  	return 0;
>  }
>  
> +static int cros_typec_thunderbolt_vdm(struct typec_altmode *alt, u32 header,
> +				      const u32 *data, int count)
> +{
> +	struct cros_typec_altmode_data *adata = typec_altmode_get_drvdata(alt);
> +
> +	int cmd_type = PD_VDO_CMDT(header);
> +	int cmd = PD_VDO_CMD(header);
> +	int svdm_version;
> +
> +	svdm_version = typec_altmode_get_svdm_version(alt);
> +	if (svdm_version < 0)
> +		return svdm_version;
> +
> +	mutex_lock(&adata->lock);
> +
> +	switch (cmd_type) {
> +	case CMDT_INIT:
> +		if (PD_VDO_SVDM_VER(header) < svdm_version) {
> +			typec_partner_set_svdm_version(adata->port->partner,
> +						       PD_VDO_SVDM_VER(header));
> +			svdm_version = PD_VDO_SVDM_VER(header);
> +		}
> +
> +		adata->header = VDO(adata->sid, 1, svdm_version, cmd);
> +		adata->header |= VDO_OPOS(adata->mode);
> +
> +		switch (cmd) {
> +		case CMD_ENTER_MODE:
> +			/* Don't respond to the enter mode vdm because it
> +			 * triggers mux configuration. This is handled directly
> +			 * by the cros_ec_typec driver so the Thunderbolt driver
> +			 * doesn't need to be involved.
> +			 */
> +			break;
> +		default:
> +			adata->header |= VDO_CMDT(CMDT_RSP_ACK);
> +			schedule_work(&adata->work);
> +			break;
> +		}
> +
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	mutex_unlock(&adata->lock);
> +	return 0;
> +}
> +
> +
>  static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
>  				      const u32 *data, int count)
>  {
> @@ -207,6 +260,9 @@ static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
>  	if (adata->sid == USB_TYPEC_DP_SID)
>  		return cros_typec_displayport_vdm(alt, header, data, count);
>  
> +	if (adata->sid == USB_TYPEC_TBT_SID)
> +		return cros_typec_thunderbolt_vdm(alt, header, data, count);
> +
>  	return -EINVAL;
>  }
>  
> @@ -283,3 +339,35 @@ cros_typec_register_displayport(struct cros_typec_port *port,
>  	return alt;
>  }
>  #endif
> +
> +#if IS_ENABLED(CONFIG_TYPEC_TBT_ALTMODE)
> +struct typec_altmode *
> +cros_typec_register_thunderbolt(struct cros_typec_port *port,
> +				struct typec_altmode_desc *desc)
> +{
> +	struct typec_altmode *alt;
> +	struct cros_typec_altmode_data *adata;
> +
> +	alt = typec_port_register_altmode(port->port, desc);
> +	if (IS_ERR(alt))
> +		return alt;
> +
> +	adata = devm_kzalloc(&alt->dev, sizeof(*adata), GFP_KERNEL);
> +	if (!adata) {
> +		typec_unregister_altmode(alt);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	INIT_WORK(&adata->work, cros_typec_altmode_work);
> +	adata->alt = alt;
> +	adata->port = port;
> +	adata->ap_mode_entry = true;
> +	adata->sid = desc->svid;
> +	adata->mode = desc->mode;
> +
> +	typec_altmode_set_ops(alt, &cros_typec_altmode_ops);
> +	typec_altmode_set_drvdata(alt, adata);
> +
> +	return alt;
> +}
> +#endif
> diff --git a/drivers/platform/chrome/cros_typec_altmode.h b/drivers/platform/chrome/cros_typec_altmode.h
> index ed00ee7a402b..3f2aa95d065a 100644
> --- a/drivers/platform/chrome/cros_typec_altmode.h
> +++ b/drivers/platform/chrome/cros_typec_altmode.h
> @@ -34,4 +34,18 @@ static inline int cros_typec_displayport_status_update(struct typec_altmode *alt
>  	return 0;
>  }
>  #endif
> +
> +#if IS_ENABLED(CONFIG_TYPEC_TBT_ALTMODE)
> +struct typec_altmode *
> +cros_typec_register_thunderbolt(struct cros_typec_port *port,
> +				struct typec_altmode_desc *desc);
> +#else
> +static inline struct typec_altmode *
> +cros_typec_register_thunderbolt(struct cros_typec_port *port,
> +				struct typec_altmode_desc *desc)
> +{
> +	return typec_port_register_altmode(port->port, desc);
> +}
> +#endif
> +
>  #endif /* __CROS_TYPEC_ALTMODE_H__ */
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 
> 

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Re: [PATCH v5 8/8] platform/chrome: cros_ec_typec: Disable tbt on port

[Benson Leung]

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On Fri, Dec 13, 2024 at 03:35:49PM -0800, Abhishek Pandit-Subedi wrote:
> Altmodes with cros_ec are either automatically entered by the EC or
> entered by the AP if TBT or USB4 are supported on the system. Due to the
> security risk of PCIe tunneling, TBT modes should not be auto entered by
> the kernel at this time and will require user intervention.
> 
> With this change, a userspace program will need to explicitly activate
> the thunderbolt mode on the port and partner in order to enter the mode
> and the thunderbolt driver will not automatically enter when a partner
> is connected.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>

Reviewed-by: Benson Leung <bleung@chromium.org>


> ---
> 
> (no changes since v3)
> 
> Changes in v3:
> - Set port.inactive = true instead of auto-enter.
> 
> Changes in v2:
> - Only disable auto-enter for Thunderbolt
> - Update commit message to clearly indicate the need for userspace
>   intervention to enter TBT mode
> 
>  drivers/platform/chrome/cros_ec_typec.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index 1ac5798d887f..6ee182101bc9 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -311,6 +311,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>  		memset(&desc, 0, sizeof(desc));
>  		desc.svid = USB_TYPEC_TBT_SID;
>  		desc.mode = TBT_MODE;
> +		desc.inactive = true;
>  		amode = cros_typec_register_thunderbolt(port, &desc);
>  		if (IS_ERR(amode))
>  			return PTR_ERR(amode);
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
> 

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Re: [PATCH v5 0/8] Thunderbolt and DP altmode support for cros-ec-typec

[Tzung-Bi Shih]

On Fri, Dec 13, 2024 at 03:35:41PM -0800, Abhishek Pandit-Subedi wrote:
> Abhishek Pandit-Subedi (7):
>   usb: typec: Only use SVID for matching altmodes
>   usb: typec: Make active on port altmode writable
>   usb: typec: Print err when displayport fails to enter
>   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 on port
> 
> Heikki Krogerus (1):
>   usb: typec: Add driver for Thunderbolt 3 Alternate Mode

It looks no but just want to confirm: does the 4 cros_ec_typec patches
build-time depend on the typec patches?  I.e. can they merge through
different trees?