linux-kernel - [PATCH v2 2/2] platform/chrome: cros_ec_typec: Make sure the USB role switch has PLD

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Date: Tue, 13 Feb 2024 15:00:18 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Prashant Malani <pmalani@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Benson Leung <bleung@...omium.org>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Guenter Roeck <groeck@...omium.org>,
	Emilie Roberts <hadrosaur@...gle.com>,
	"Nyman, Mathias" <mathias.nyman@...el.com>,
	"Regupathy, Rajaram" <rajaram.regupathy@...el.com>,
	"Radjacoumar, Shyam Sundar" <ssradjacoumar@...gle.com>,
	Samuel Jacob <samjaco@...gle.com>,
	Uday Bhat <uday.m.bhat@...el.com>,
	linux-usb@...r.kernel.org,
	chrome-platform@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Make sure the USB role switch has PLD

The USB role switch does not always have the _PLD (Physical
Location of Device) in ACPI tables. If it's missing,
assigning the PLD hash of the port to the switch. That
should guarantee that the USB Type-C port mapping code is
always able to find the connection between the two (the port
and the switch).

Tested-by: Uday Bhat <uday.m.bhat@...el.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/platform/chrome/cros_ec_typec.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 2b2f14a1b711..4d305876ec08 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -24,6 +24,23 @@
 #define DP_PORT_VDO	(DP_CONF_SET_PIN_ASSIGN(BIT(DP_PIN_ASSIGN_C) | BIT(DP_PIN_ASSIGN_D)) | \
 				DP_CAP_DFP_D | DP_CAP_RECEPTACLE)
 
+static void cros_typec_role_switch_quirk(struct fwnode_handle *fwnode)
+{
+#ifdef CONFIG_ACPI
+	struct fwnode_handle *switch_fwnode;
+
+	/* Supply the USB role switch with the correct pld_crc if it's missing. */
+	switch_fwnode = fwnode_find_reference(fwnode, "usb-role-switch", 0);
+	if (!IS_ERR_OR_NULL(switch_fwnode)) {
+		struct acpi_device *adev = to_acpi_device_node(switch_fwnode);
+
+		if (adev && !adev->pld_crc)
+			adev->pld_crc = to_acpi_device_node(fwnode)->pld_crc;
+		fwnode_handle_put(switch_fwnode);
+	}
+#endif
+}
+
 static int cros_typec_parse_port_props(struct typec_capability *cap,
 				       struct fwnode_handle *fwnode,
 				       struct device *dev)
@@ -66,6 +83,8 @@ static int cros_typec_parse_port_props(struct typec_capability *cap,
 		cap->prefer_role = ret;
 	}
 
+	cros_typec_role_switch_quirk(fwnode);
+
 	cap->fwnode = fwnode;
 
 	return 0;
-- 
2.43.0