thunderbolt: Drop unused tb_port_set_initial_credits()

This function is not used anymore in the driver so we can remove it.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/switch.c

@@ -626,28 +626,6 @@ int tb_port_add_nfc_credits(struct tb_port *port, int credits)
 			     TB_CFG_PORT, ADP_CS_4, 1);
 }
 
-/**
- * tb_port_set_initial_credits() - Set initial port link credits allocated
- * @port: Port to set the initial credits
- * @credits: Number of credits to to allocate
- *
- * Set initial credits value to be used for ingress shared buffering.
- */
-int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
-{
-	u32 data;
-	int ret;
-
-	ret = tb_port_read(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
-	if (ret)
-		return ret;
-
-	data &= ~ADP_CS_5_LCA_MASK;
-	data |= (credits << ADP_CS_5_LCA_SHIFT) & ADP_CS_5_LCA_MASK;
-
-	return tb_port_write(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
-}
-
 /**
  * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
  * @port: Port whose counters to clear

drivers/thunderbolt/tb.h

@@ -834,7 +834,6 @@ static inline bool tb_switch_tmu_is_enabled(const struct tb_switch *sw)
 
 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
 int tb_port_add_nfc_credits(struct tb_port *port, int credits);
-int tb_port_set_initial_credits(struct tb_port *port, u32 credits);
 int tb_port_clear_counter(struct tb_port *port, int counter);
 int tb_port_unlock(struct tb_port *port);
 int tb_port_enable(struct tb_port *port);