[coreboot-gerrit] Change in coreboot[master]: mb/volteer: Disable TBT if platform is only USB3

[Brandon Breitenstein (Code Review)]

Brandon Breitenstein has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/43771 )

Change subject: mb/volteer: Disable TBT if platform is only USB3
......................................................................

mb/volteer: Disable TBT if platform is only USB3

TBT ports should be disabled if the DB is a USB3 DB. It is assumed if
the DB doesn't support TBT the platform as a whole should only be USB3
capable and TBT functionality on both ports should be disabled

BUG=NONE
BRANCH=NONE
TEST=Built coreboot and verified that TBT was disabled on platform with
USB3 DB and enabled on platform with USB4/TBT DB

Change-Id: I594f2e9483aaf896de2b6aea9a3460bd3826c58c
Signed-off-by: Brandon Breitenstein 
---
M src/mainboard/google/volteer/romstage.c
1 file changed, 7 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/71/43771/1

diff --git a/src/mainboard/google/volteer/romstage.c b/src/mainboard/google/volteer/romstage.c
index d35bbb5..a8da340 100644
--- a/src/mainboard/google/volteer/romstage.c
+++ b/src/mainboard/google/volteer/romstage.c
@@ -31,6 +31,13 @@
    if (fw_config_probe(FW_CONFIG(AUDIO, NONE)))
    	mem_cfg->PchHdaEnable = 0;

+	/* If the DB is USB3 disable TBT on the platform */
+	if (fw_config_probe(FW_CONFIG(DB_USB, USB3_ACTIVE)) ||
+		fw_config_probe(FW_CONFIG(DB_USB, USB3_PASSIVE))) {
+		mem_cfg->TcssItbtPcie0En = 0;
+		mem_cfg->TcssItbtPcie1En = 0;
+	}
+
    meminit_lpddr4x(mem_cfg, board_cfg, &spd_info, half_populated);
 }