thunderbolt: Add support for receiver lane margining
USB4 spec defines standard set of registers to be used for receiver lane
margining. This is useful for I/O interface quality and electrical
robustness validation during manufacturing. Expose receiver lane
margining through new debugfs directory "margining" that is added under
each connected USB4 port. Users can then run the margining by writing to
the exposed attributes under that directory.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index ded1f1d..87aefac 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -279,12 +279,16 @@ struct tb_port {
* @can_offline: Does the port have necessary platform support to moved
* it into offline mode and back
* @offline: The port is currently in offline mode
+ * @margining: Pointer to margining structure if enabled
*/
struct usb4_port {
struct device dev;
struct tb_port *port;
bool can_offline;
bool offline;
+#ifdef CONFIG_USB4_DEBUGFS_MARGINING
+ struct tb_margining *margining;
+#endif
};
/**
@@ -1188,6 +1192,13 @@ int usb4_port_router_offline(struct tb_port *port);
int usb4_port_router_online(struct tb_port *port);
int usb4_port_enumerate_retimers(struct tb_port *port);
bool usb4_port_clx_supported(struct tb_port *port);
+int usb4_port_margining_caps(struct tb_port *port, u32 *caps);
+int usb4_port_hw_margin(struct tb_port *port, unsigned int lanes,
+ unsigned int ber_level, bool timing, bool right_high,
+ u32 *results);
+int usb4_port_sw_margin(struct tb_port *port, unsigned int lanes, bool timing,
+ bool right_high, u32 counter);
+int usb4_port_sw_margin_errors(struct tb_port *port, u32 *errors);
int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index);
int usb4_port_retimer_read(struct tb_port *port, u8 index, u8 reg, void *buf,
@@ -1270,6 +1281,8 @@ void tb_debugfs_init(void);
void tb_debugfs_exit(void);
void tb_switch_debugfs_init(struct tb_switch *sw);
void tb_switch_debugfs_remove(struct tb_switch *sw);
+void tb_xdomain_debugfs_init(struct tb_xdomain *xd);
+void tb_xdomain_debugfs_remove(struct tb_xdomain *xd);
void tb_service_debugfs_init(struct tb_service *svc);
void tb_service_debugfs_remove(struct tb_service *svc);
#else
@@ -1277,6 +1290,8 @@ static inline void tb_debugfs_init(void) { }
static inline void tb_debugfs_exit(void) { }
static inline void tb_switch_debugfs_init(struct tb_switch *sw) { }
static inline void tb_switch_debugfs_remove(struct tb_switch *sw) { }
+static inline void tb_xdomain_debugfs_init(struct tb_xdomain *xd) { }
+static inline void tb_xdomain_debugfs_remove(struct tb_xdomain *xd) { }
static inline void tb_service_debugfs_init(struct tb_service *svc) { }
static inline void tb_service_debugfs_remove(struct tb_service *svc) { }
#endif
