[coreboot-gerrit] Change in coreboot[master]: mb/google/volteer: Only enable TBT root ports if USB4 is supported

[Duncan Laurie (Code Review)]

Duncan Laurie has submitted this change. ( https://review.coreboot.org/c/coreboot/+/43771 )

Change subject: mb/google/volteer: Only enable TBT root ports if USB4 is supported
......................................................................

mb/google/volteer: Only enable TBT root ports if USB4 is supported

TBT ports should be disabled if the DB is a USB3 DB. It is assumed if
the DB doesn't support USB4 the platform as a whole should only be USB3
capable and TBT functionality on both ports should not be enabled.

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 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43771
Tested-by: build bot (Jenkins) 
Reviewed-by: Tim Wawrzynczak 
---
M src/mainboard/google/volteer/variants/baseboard/devicetree.cb
1 file changed, 12 insertions(+), 3 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Brandon Breitenstein: Looks good to me, approved
  Tim Wawrzynczak: Looks good to me, approved

diff --git a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
index 53bbe5a..57ab9e4 100644
--- a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
@@ -381,8 +381,14 @@
    	end # DPTF				0x9A03
    	device pci 05.0 off end # IPU				0x9A19
    	device pci 06.0 off end # PEG60				0x9A09
-		device pci 07.0 on  end # TBT_PCIe0			0x9A23
-		device pci 07.1 on  end # TBT_PCIe1			0x9A25
+		device pci 07.0 on	# TBT_PCIe0			0x9A23
+			probe DB_USB USB4_GEN2
+			probe DB_USB USB4_GEN3
+		end
+		device pci 07.1 on	# TBT_PCIe1			0x9A25
+			probe DB_USB USB4_GEN2
+			probe DB_USB USB4_GEN3
+		end
    	device pci 07.2 off end # TBT_PCIe2			0x9A27
    	device pci 07.3 off end # TBT_PCIe3			0x9A29
    	device pci 08.0 on  end # GNA				0x9A11
@@ -390,7 +396,10 @@
    	device pci 0a.0 off end # Crash-log SRAM		0x9A0D
    	device pci 0d.0 on  end # USB xHCI			0x9A13
    	device pci 0d.1 off end # USB xDCI (OTG)		0x9A15
-		device pci 0d.2 on  end # TBT DMA0			0x9A1B
+		device pci 0d.2 on	# TBT DMA0			0x9A1B
+			probe DB_USB USB4_GEN2
+			probe DB_USB USB4_GEN3
+		end
    	device pci 0d.3 off end # TBT DMA1			0x9A1D
    	device pci 0e.0 off end # VMD				0x9A0B