linux-kernel - [PATCH 1/2] platform/chrome: cros_ec_typec: Configure Retimer cable type

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Message-Id: <20230605010117.794691-2-utkarsh.h.patel@intel.com>
Date:   Sun,  4 Jun 2023 18:01:16 -0700
From:   Utkarsh Patel <utkarsh.h.patel@...el.com>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        heikki.krogerus@...ux.intel.com, pmalani@...omium.org,
        bleung@...omium.org
Cc:     Utkarsh Patel <utkarsh.h.patel@...el.com>
Subject: [PATCH 1/2] platform/chrome: cros_ec_typec: Configure Retimer cable type

Connector class driver only configure cable type active or passive.
With this change it will also configure if the cable type is retimer or
redriver if required by AP. This details will be provided by Chrome EC
as a part of cable discover mode VDO.

This change also brings in corresponding EC header updates from the EC
code base [1].

[1]:
https://chromium.googlesource.com/chromiumos/platform/ec/+/refs/heads/master/include/ec_commands.h

Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Utkarsh Patel <utkarsh.h.patel@...el.com>
---
 drivers/platform/chrome/cros_ec_typec.c        | 8 +++++++-
 include/linux/platform_data/cros_ec_commands.h | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index a673c3342470..9c18b1df64a7 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -448,6 +448,9 @@ static int cros_typec_enable_tbt(struct cros_typec_data *typec,
 	if (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_CABLE)
 		data.enter_vdo |= TBT_ENTER_MODE_ACTIVE_CABLE;
 
+	if (pd_ctrl->control_flags & USB_PD_CTRL_RETIMER_CABLE)
+		data.enter_vdo |= TBT_CABLE_RETIMER;
+
 	if (!port->state.alt) {
 		port->state.alt = port->port_altmode[CROS_EC_ALTMODE_TBT];
 		ret = cros_typec_usb_safe_state(port);
@@ -522,8 +525,11 @@ static int cros_typec_enable_usb4(struct cros_typec_data *typec,
 	/* Cable Type */
 	if (pd_ctrl->control_flags & USB_PD_CTRL_OPTICAL_CABLE)
 		data.eudo |= EUDO_CABLE_TYPE_OPTICAL << EUDO_CABLE_TYPE_SHIFT;
-	else if (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_CABLE)
+	else if (pd_ctrl->control_flags & USB_PD_CTRL_RETIMER_CABLE)
 		data.eudo |= EUDO_CABLE_TYPE_RE_TIMER << EUDO_CABLE_TYPE_SHIFT;
+	else if (!(pd_ctrl->control_flags & USB_PD_CTRL_RETIMER_CABLE) &&
+		  (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_CABLE))
+		data.eudo |= EUDO_CABLE_TYPE_RE_DRIVER << EUDO_CABLE_TYPE_SHIFT;
 
 	data.active_link_training = !!(pd_ctrl->control_flags &
 				       USB_PD_CTRL_ACTIVE_LINK_UNIDIR);
diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index ab721cf13a98..c9aa5495c666 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -4963,6 +4963,8 @@ struct ec_response_usb_pd_control_v1 {
 #define USB_PD_CTRL_TBT_LEGACY_ADAPTER  BIT(2)
 /* Active Link Uni-Direction */
 #define USB_PD_CTRL_ACTIVE_LINK_UNIDIR  BIT(3)
+/* Retimer/Redriver cable */
+#define USB_PD_CTRL_RETIMER_CABLE BIT(4)
 
 struct ec_response_usb_pd_control_v2 {
 	uint8_t enabled;
-- 
2.25.1