[PATCH v2 6/7] thunderbolt: decouple the waiting time of TB_PORT_UNPLUGGED and TB_PORT_UP

[Chunfeng Yun <chunfeng.yun@mediatek.com>]

When usb4 is woke up by device disconnect, no need wait for 2s,
usually the phase2~4 takes at most about 200ms, and enters to
TB_PORT_CONNECTING, if it is still in TB_PORT_UNPLUGGED after 400ms,
treat it as disconnected.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
new changes
---
 drivers/thunderbolt/switch.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 7daee83c7ed8..e12546bfb869 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -489,8 +489,9 @@ int tb_port_state(struct tb_port *port)
  * Wait up to 2 seconds for a port to reach state TB_PORT_UP. If
  * wait_if_unplugged is set then we also wait if the port is in state
  * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
- * switch resume). Otherwise we only wait if a device is registered but the link
- * has not yet been established.
+ * switch resume, Wait at most 400 ms for link to start connecting,
+ * if timeout, means the device is disconnected). Otherwise we only wait
+ * if a device is registered but the link has not yet been established.
  *
  * Return:
  * * %0 - If the port is not connected or failed to reach
@@ -501,6 +502,7 @@ int tb_port_state(struct tb_port *port)
 int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
 {
 	int retries = 20;
+	int unplugged_retries = 4;
 	int state;
 	if (!port->cap_phy) {
 		tb_port_WARN(port, "does not have PHY\n");
@@ -519,7 +521,7 @@ int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
 			return 0;
 
 		case TB_PORT_UNPLUGGED:
-			if (wait_if_unplugged) {
+			if (wait_if_unplugged && unplugged_retries--) {
 				/* used during resume */
 				tb_port_dbg(port,
 					    "is unplugged (state: 7), retrying...\n");
-- 
2.45.2