drm: bridge: anx7625: implement minimal Type-C support

ANX7625 can be used as a USB-C controller, handling USB and DP data
streams. Provide minimal Type-C support necessary for ANX7625 to
register the Type-C port device and properly respond to data / power
role events from the Type-C partner.

While ANX7625 provides TCPCI interface, using it would circumvent the
on-chip running firmware. Analogix recommended using the higher-level
interface instead of TCPCI.

Reviewed-by: Xin Ji <xji@analogixsemi.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260121-anx7625-typec-v2-2-d14f31256a17@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drivers/gpu/drm/bridge/analogix/Kconfig

@@ -34,6 +34,7 @@ config DRM_ANALOGIX_ANX7625
 	tristate "Analogix Anx7625 MIPI to DP interface support"
 	depends on DRM
 	depends on OF
+	depends on TYPEC || !TYPEC
 	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
 	select DRM_DISPLAY_HELPER

drivers/gpu/drm/bridge/analogix/anx7625.c

@@ -3,6 +3,7 @@
  * Copyright(c) 2020, Analogix Semiconductor. All rights reserved.
  *
  */
+#include <linux/cleanup.h>
 #include <linux/gcd.h>
 #include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
@@ -15,6 +16,9 @@
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/usb.h>
+#include <linux/usb/pd.h>
+#include <linux/usb/role.h>
 #include <linux/workqueue.h>
 
 #include <linux/of_graph.h>
@@ -1325,7 +1329,7 @@ static int anx7625_read_hpd_gpio_config_status(struct anx7625_data *ctx)
 static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
 {
 	struct device *dev = ctx->dev;
-	int ret, val;
+	int ret;
 
 	/* Reset main ocm */
 	ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client, 0x88, 0x40);
@@ -1339,6 +1343,11 @@ static void anx7625_disable_pd_protocol(struct anx7625_data *ctx)
 		DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature fail.\n");
 	else
 		DRM_DEV_DEBUG_DRIVER(dev, "disable PD feature succeeded.\n");
+}
+
+static void anx7625_configure_hpd(struct anx7625_data *ctx)
+{
+	int val;
 
 	/*
 	 * Make sure the HPD GPIO already be configured after OCM release before
@@ -1369,7 +1378,9 @@ static int anx7625_ocm_loading_check(struct anx7625_data *ctx)
 	if ((ret & FLASH_LOAD_STA_CHK) != FLASH_LOAD_STA_CHK)
 		return -ENODEV;
 
-	anx7625_disable_pd_protocol(ctx);
+	if (!ctx->typec_port)
+		anx7625_disable_pd_protocol(ctx);
+	anx7625_configure_hpd(ctx);
 
 	DRM_DEV_DEBUG_DRIVER(dev, "Firmware ver %02x%02x,",
 			     anx7625_reg_read(ctx,
@@ -1472,6 +1483,107 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
 	DRM_DEV_DEBUG_DRIVER(dev, "Secure OCM version=%02x\n", ret);
 }
 
+#if IS_REACHABLE(CONFIG_TYPEC)
+static void anx7625_typec_set_orientation(struct anx7625_data *ctx)
+{
+	u32 val = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
+
+	if (val & (CC1_RP | CC1_RD))
+		typec_set_orientation(ctx->typec_port, TYPEC_ORIENTATION_NORMAL);
+	else if (val & (CC2_RP | CC2_RD))
+		typec_set_orientation(ctx->typec_port, TYPEC_ORIENTATION_REVERSE);
+	else
+		typec_set_orientation(ctx->typec_port, TYPEC_ORIENTATION_NONE);
+}
+
+static void anx7625_typec_set_status(struct anx7625_data *ctx,
+				     unsigned int intr_status,
+				     unsigned int intr_vector)
+{
+	if (intr_vector & CC_STATUS)
+		anx7625_typec_set_orientation(ctx);
+	if (intr_vector & DATA_ROLE_STATUS) {
+		enum typec_data_role data_role = (intr_status & DATA_ROLE_STATUS) ?
+			TYPEC_HOST : TYPEC_DEVICE;
+		usb_role_switch_set_role(ctx->role_sw,
+					 (intr_status & DATA_ROLE_STATUS) ?
+					 USB_ROLE_HOST : USB_ROLE_DEVICE);
+		typec_set_data_role(ctx->typec_port, data_role);
+		ctx->typec_data_role = data_role;
+	}
+	if (intr_vector & VBUS_STATUS)
+		typec_set_pwr_role(ctx->typec_port,
+				   (intr_status & VBUS_STATUS) ?
+				   TYPEC_SOURCE : TYPEC_SINK);
+	if (intr_vector & VCONN_STATUS)
+		typec_set_vconn_role(ctx->typec_port,
+				     (intr_status & VCONN_STATUS) ?
+				     TYPEC_SOURCE : TYPEC_SINK);
+}
+
+static int anx7625_typec_register(struct anx7625_data *ctx)
+{
+	struct typec_capability typec_cap = { };
+	struct fwnode_handle *fwnode __free(fwnode_handle) =
+		device_get_named_child_node(ctx->dev, "connector");
+	u32 val;
+	int ret;
+
+	if (!fwnode)
+		return 0;
+
+	ret = typec_get_fw_cap(&typec_cap, fwnode);
+	if (ret < 0)
+		return ret;
+
+	typec_cap.revision = 0x0120;
+	typec_cap.pd_revision = 0x0300;
+	typec_cap.usb_capability = USB_CAPABILITY_USB2 | USB_CAPABILITY_USB3;
+	typec_cap.orientation_aware = true;
+
+	typec_cap.driver_data = ctx;
+
+	ctx->typec_port = typec_register_port(ctx->dev, &typec_cap);
+	if (IS_ERR(ctx->typec_port))
+		return PTR_ERR(ctx->typec_port);
+
+	ctx->role_sw = fwnode_usb_role_switch_get(fwnode);
+	if (IS_ERR(ctx->role_sw)) {
+		typec_unregister_port(ctx->typec_port);
+		return PTR_ERR(ctx->role_sw);
+	}
+
+	val = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
+
+	anx7625_typec_set_status(ctx, val,
+				 CC_STATUS | DATA_ROLE_STATUS |
+				 VBUS_STATUS | VCONN_STATUS);
+
+	return 0;
+}
+
+static void anx7625_typec_unregister(struct anx7625_data *ctx)
+{
+	usb_role_switch_put(ctx->role_sw);
+	typec_unregister_port(ctx->typec_port);
+}
+#else
+static void anx7625_typec_set_status(struct anx7625_data *ctx,
+				     unsigned int intr_status,
+				     unsigned int intr_vector)
+{
+}
+
+static int anx7625_typec_register(struct anx7625_data *ctx)
+{
+	return 0;
+}
+
+static void anx7625_typec_unregister(struct anx7625_data *ctx)
+{
+}
+#endif
+
 static int anx7625_read_hpd_status_p0(struct anx7625_data *ctx)
 {
 	return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, SYSTEM_STSTUS);
@@ -1566,7 +1678,7 @@ static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
 	}
 }
 
-static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
+static int anx7625_intr_status(struct anx7625_data *ctx)
 {
 	int intr_vector, status;
 	struct device *dev = ctx->dev;
@@ -1593,9 +1705,6 @@ static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
 		return status;
 	}
 
-	if (!(intr_vector & HPD_STATUS_CHANGE))
-		return -ENOENT;
-
 	status = anx7625_reg_read(ctx, ctx->i2c.rx_p0_client,
 				  SYSTEM_STSTUS);
 	if (status < 0) {
@@ -1604,6 +1713,12 @@ static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
 	}
 
 	DRM_DEV_DEBUG_DRIVER(dev, "0x7e:0x45=%x\n", status);
+
+	anx7625_typec_set_status(ctx, status, intr_vector);
+
+	if (!(intr_vector & HPD_STATUS))
+		return -ENOENT;
+
 	dp_hpd_change_handler(ctx, status & HPD_STATUS);
 
 	return 0;
@@ -1622,7 +1737,7 @@ static void anx7625_work_func(struct work_struct *work)
 		return;
 	}
 
-	event = anx7625_hpd_change_detect(ctx);
+	event = anx7625_intr_status(ctx);
 
 	mutex_unlock(&ctx->lock);
 
@@ -2741,11 +2856,29 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 	}
 
 	if (!platform->pdata.low_power_mode) {
-		anx7625_disable_pd_protocol(platform);
+		struct fwnode_handle *fwnode;
+
+		fwnode = device_get_named_child_node(dev, "connector");
+		if (fwnode)
+			fwnode_handle_put(fwnode);
+		else
+			anx7625_disable_pd_protocol(platform);
+
+		anx7625_configure_hpd(platform);
+
 		pm_runtime_get_sync(dev);
 		_anx7625_hpd_polling(platform, 5000 * 100);
 	}
 
+	if (platform->pdata.intp_irq)
+		anx7625_reg_write(platform, platform->i2c.rx_p0_client,
+				  INTERFACE_CHANGE_INT_MASK, 0);
+
+	/* After getting runtime handle */
+	ret = anx7625_typec_register(platform);
+	if (ret)
+		goto pm_suspend;
+
 	/* Add work function */
 	if (platform->pdata.intp_irq) {
 		enable_irq(platform->pdata.intp_irq);
@@ -2759,6 +2892,10 @@ static int anx7625_i2c_probe(struct i2c_client *client)
 
 	return 0;
 
+pm_suspend:
+	if (!platform->pdata.low_power_mode)
+		pm_runtime_put_sync_suspend(&client->dev);
+
 free_wq:
 	if (platform->workqueue)
 		destroy_workqueue(platform->workqueue);
@@ -2774,6 +2911,8 @@ static void anx7625_i2c_remove(struct i2c_client *client)
 {
 	struct anx7625_data *platform = i2c_get_clientdata(client);
 
+	anx7625_typec_unregister(platform);
+
 	drm_bridge_remove(&platform->bridge);
 
 	if (platform->pdata.intp_irq)

drivers/gpu/drm/bridge/analogix/anx7625.h

@@ -51,9 +51,21 @@
 #define INTR_RECEIVED_MSG BIT(5)
 
 #define SYSTEM_STSTUS 0x45
+#define INTERFACE_CHANGE_INT_MASK 0x43
 #define INTERFACE_CHANGE_INT 0x44
-#define HPD_STATUS_CHANGE 0x80
+#define VCONN_STATUS	BIT(2)
-#define HPD_STATUS 0x80
+#define VBUS_STATUS	BIT(3)
+#define CC_STATUS	BIT(4)
+#define DATA_ROLE_STATUS	BIT(5)
+#define HPD_STATUS	BIT(7)
+
+#define NEW_CC_STATUS 0x46
+#define CC1_RD                  BIT(0)
+#define CC1_RA                  BIT(1)
+#define CC1_RP			(BIT(2) | BIT(3))
+#define CC2_RD                  BIT(4)
+#define CC2_RA                  BIT(5)
+#define CC2_RP			(BIT(6) | BIT(7))
 
 /******** END of I2C Address 0x58 ********/
 
@@ -447,9 +459,15 @@ struct anx7625_i2c_client {
 	struct i2c_client *tcpc_client;
 };
 
+struct typec_port;
+struct usb_role_switch;
+
 struct anx7625_data {
 	struct anx7625_platform_data pdata;
 	struct platform_device *audio_pdev;
+	struct typec_port *typec_port;
+	struct usb_role_switch *role_sw;
+	int typec_data_role;
 	int hpd_status;
 	int hpd_high_cnt;
 	int dp_en;