return !!(widths & width);
}
-static int tb_port_set_link_width(struct tb_port *port, unsigned int width)
+/**
+ * tb_port_set_link_width() - Set target link width of the lane adapter
+ * @port: Lane adapter
+ * @width: Target link width (%1 or %2)
+ *
+ * Sets the target link width of the lane adapter to @width. Does not
+ * enable/disable lane bonding. For that call tb_port_set_lane_bonding().
+ *
+ * Return: %0 in case of success and negative errno in case of error
+ */
+int tb_port_set_link_width(struct tb_port *port, unsigned int width)
{
u32 val;
int ret;
return -EINVAL;
}
- val |= LANE_ADP_CS_1_LB;
-
return tb_port_write(port, &val, TB_CFG_PORT,
port->cap_phy + LANE_ADP_CS_1, 1);
}
/**
+ * tb_port_set_lane_bonding() - Enable/disable lane bonding
+ * @port: Lane adapter
+ * @bonding: enable/disable bonding
+ *
+ * Enables or disables lane bonding. This should be called after target
+ * link width has been set (tb_port_set_link_width()). Note in most
+ * cases one should use tb_port_lane_bonding_enable() instead to enable
+ * lane bonding.
+ *
+ * As a side effect sets @port->bonding accordingly (and does the same
+ * for lane 1 too).
+ *
+ * Return: %0 in case of success and negative errno in case of error
+ */
+int tb_port_set_lane_bonding(struct tb_port *port, bool bonding)
+{
+ u32 val;
+ int ret;
+
+ if (!port->cap_phy)
+ return -EINVAL;
+
+ ret = tb_port_read(port, &val, TB_CFG_PORT,
+ port->cap_phy + LANE_ADP_CS_1, 1);
+ if (ret)
+ return ret;
+
+ if (bonding)
+ val |= LANE_ADP_CS_1_LB;
+ else
+ val &= ~LANE_ADP_CS_1_LB;
+
+ ret = tb_port_write(port, &val, TB_CFG_PORT,
+ port->cap_phy + LANE_ADP_CS_1, 1);
+ if (ret)
+ return ret;
+
+ /*
+ * When lane 0 bonding is set it will affect lane 1 too so
+ * update both.
+ */
+ port->bonded = bonding;
+ port->dual_link_port->bonded = bonding;
+
+ return 0;
+}
+
+/**
* tb_port_lane_bonding_enable() - Enable bonding on port
* @port: port to enable
*
if (ret == 1) {
ret = tb_port_set_link_width(port, 2);
if (ret)
- return ret;
+ goto err_lane0;
}
ret = tb_port_get_link_width(port->dual_link_port);
if (ret == 1) {
ret = tb_port_set_link_width(port->dual_link_port, 2);
- if (ret) {
- tb_port_set_link_width(port, 1);
- return ret;
- }
+ if (ret)
+ goto err_lane0;
}
- port->bonded = true;
- port->dual_link_port->bonded = true;
+ ret = tb_port_set_lane_bonding(port, true);
+ if (ret)
+ goto err_lane1;
return 0;
+
+err_lane1:
+ tb_port_set_link_width(port->dual_link_port, 1);
+err_lane0:
+ tb_port_set_link_width(port, 1);
+ return ret;
}
/**
*
* Disable bonding by setting the link width of the port and the
* other port in case of dual link port.
- *
*/
void tb_port_lane_bonding_disable(struct tb_port *port)
{
- port->dual_link_port->bonded = false;
- port->bonded = false;
-
+ tb_port_set_lane_bonding(port, false);
tb_port_set_link_width(port->dual_link_port, 1);
tb_port_set_link_width(port, 1);
}