mb/lenovo/{x230, x230s}: Disable SuperSpeed capabilities for WWAN USB
Although on ThinkPads with Panther Point PCH the usb port inside wwan
socket is usually wired to XHCI, it has actually no SuperSpeed lines,
so maybe it is okay to disable SuperSpeed capabilities, and wire them
to EHCI #2 by making use of XUSB2PRM and USB3PRM.
This applies to both variants of x230.
Change-Id: Ia8d27be84e4dbfa0efed506b9fc010e7f4d6ba23
Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41505
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/lenovo/x230/devicetree.cb b/src/mainboard/lenovo/x230/devicetree.cb
index 3a8e5fe8..085b4e1 100644
--- a/src/mainboard/lenovo/x230/devicetree.cb
+++ b/src/mainboard/lenovo/x230/devicetree.cb
@@ -58,8 +58,9 @@
register "gen2_dec" = "0x0c15e1"
register "gen4_dec" = "0x0c06a1"
- register "xhci_switchable_ports" = "0xf"
- register "superspeed_capable_ports" = "0xf"
+ # Do not enable xHCI Port 4 since WWAN USB is EHCI-only
+ register "xhci_switchable_ports" = "0x7"
+ register "superspeed_capable_ports" = "0x7"
register "xhci_overcurrent_mapping" = "0x4000201"
# Enable zero-based linear PCIe root port functions