TCPMv2: Add common exit mode for all the alternate modes

When chipset is transitioning to a new state or on sysjump, the SOC
re-negotiates to enter an alternate mode on booting up.

This commit:
1. Adds a common DPM function to check for all the active alternate modes
   one at a time, construct the VDM and send the DPM request to exit the
   mode.
2. Marks thunderbolt mode as inactive in DFP's thunderbolt mode exit
   function.

BUG=b:152235216
BRANCH=None
TEST=Tested on volteer:
     1. On connecting a DP dongle, able to enter into DP alternate mode
        on reboot
     2. On connecting a Thunderbolt dock, able to enter into Thunderbolt
        mode on reboot

Change-Id: I7da6a4b08cab9abb3446c0dafdc7c9e9378ef00e
Signed-off-by: Ayushee <ayushee.shah@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2270877
Tested-by: Abe Levkoy <alevkoy@chromium.org>
Reviewed-by: Abe Levkoy <alevkoy@chromium.org>
Commit-Queue: Abe Levkoy <alevkoy@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/usb_tbt_alt_mode.h b/include/usb_tbt_alt_mode.h
index 186c2f8139..c46c471035 100644
--- a/include/usb_tbt_alt_mode.h
+++ b/include/usb_tbt_alt_mode.h
@@ -23,6 +23,15 @@
 void tbt_init(int port);
 
 /*
+ * Returns True if Thunderbolt mode is in active state
+ *
+ * @param port      USB-C port number
+ * @return          True if Thunderbolt mode is in active state
+ *                  False otherwise
+ */
+bool tbt_is_active(int port);
+
+/*
  * Handles received Thunderbolt VDM ACKs.
  *
  * @param port      USB-C port number