clean: update vconn comment
After looking at old bug, over voltage is not part of the reason we set
Vconn on TCPC before PPC.
BRANCH=none
TEST=none
Commit-Ready: ChromeOS CL Exonerator Bot
Tested-by: Will Arthur
@@ -391,8 +391,8 @@ static void set_vconn(int port, int enable)
{
/*
* We always need to tell the TCPC to enable Vconn first, otherwise some
- * TCPCs get confused and think the CC line is in over voltage mode and
- * immediately disconnects. If there is a PPC, both devices will
+ * TCPCs get confused when a PPC sets secondary CC line to 5V and TCPC
+ * immediately disconnect. If there is a PPC, both devices will
* potentially source Vconn, but that should be okay since Vconn has
* "make before break" electrical requirements when swapping anyway.
*/
