[PATCH v2 10/11] platform/chrome: cros_ec_typec: Support DP orientation

[Stephen Boyd]

Handle orientation for the type-c port when the DT node has the
'orientation' property. The 'orientation' property is present when the
DisplayPort lanes are directly wired to the usb-c-connector and the
board design relies on the DP lanes to be remapped by software. The
property wouldn't be present if, for example, the EC controls a port
mapper part that flips the DP lanes for the port orientation.

Pass the port orientation to drm_dp_typec_bridge_assign_pins() when the
DT property is present so that the previous drm_bridge in the bridge
chain can remap the DP lanes to the right usb-c-connector SuperSpeed
pins for the orientation.

Cc: Prashant Malani <pmalani at chromium.org>
Cc: Benson Leung <bleung at chromium.org>
Cc: Tzung-Bi Shih <tzungbi at kernel.org>
Cc: <chrome-platform at lists.linux.dev>
Cc: Pin-yen Lin <treapking at chromium.org>
Signed-off-by: Stephen Boyd <swboyd at chromium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index fa7f7efb9d3f..9b54b3288f5f 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -28,6 +28,7 @@ struct cros_typec_dp_bridge {
 	struct cros_typec_data *typec_data;
 	struct drm_dp_typec_bridge_dev *dev;
 	struct cros_typec_port *active_port;
+	bool orientation;
 };
 
 #define DP_PORT_VDO	(DP_CONF_SET_PIN_ASSIGN(BIT(DP_PIN_ASSIGN_C) | BIT(DP_PIN_ASSIGN_D)) | \
@@ -449,13 +450,15 @@ static int cros_typec_init_dp_bridge(struct cros_typec_data *typec)
 	struct device *dev = typec->dev;
 	struct cros_typec_dp_bridge *dp_bridge;
 	struct fwnode_handle *ep __free(fwnode_handle);
+	struct fwnode_handle *devnode;
 	struct drm_dp_typec_bridge_dev *dp_dev;
 	int num_lanes;
 	struct drm_dp_typec_bridge_desc desc = {
 		.of_node = dev->of_node,
 	};
 
-	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
+	devnode = dev_fwnode(dev);
+	ep = fwnode_graph_get_endpoint_by_id(devnode, 0, 0, 0);
 	if (!ep) {
 		/* There isn't a DP input endpoint. Ignore. */
 		return 0;
@@ -467,6 +470,8 @@ static int cros_typec_init_dp_bridge(struct cros_typec_data *typec)
 	typec->dp_bridge = dp_bridge;
 	dp_bridge->typec_data = typec;
 
+	dp_bridge->orientation = fwnode_property_read_bool(devnode, "orientation");
+
 	num_lanes = fwnode_property_count_u32(ep, "data-lanes");
 	if (num_lanes < 0)
 		num_lanes = 4;
@@ -582,6 +587,7 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
 	u32 cable_tbt_vdo;
 	u32 cable_dp_vdo;
 	int ret;
+	enum typec_orientation orientation;
 	bool hpd_asserted = port->mux_flags & USB_PD_MUX_HPD_LVL;
 
 	if (typec->pd_ctrl_ver < 2) {
@@ -622,7 +628,13 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
 	}
 
 	if (dp_bridge && dp_bridge->active_port == port) {
-		ret = drm_dp_typec_bridge_assign_pins(dp_bridge->dev, dp_data.conf, 0,
+		orientation = TYPEC_ORIENTATION_NORMAL;
+		if (dp_bridge->orientation &&
+		    port->mux_flags & USB_PD_MUX_POLARITY_INVERTED)
+			orientation = TYPEC_ORIENTATION_REVERSE;
+
+		ret = drm_dp_typec_bridge_assign_pins(dp_bridge->dev, dp_data.conf,
+						      orientation,
 						      port->lane_mapping);
 		if (ret)
 			return ret;
-- 
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