soc/amd/picasso: don't apply unconfigured USB2 PHY tune parameters
Since FSP pre-populates the UPD struct with the non-zero default values,
coreboot shouldn't set them to zero in the case that they aren't
configured in the board's devicetree. Since all parameters being zero is
a valid case, this patch adds another devicetree option that applying
the devicetree settings for the USB2 PHY tuning depends on being set.
BUG=b:161923068
Change-Id: I66e5811ce64298b0644d2881420634a8ce1379d7
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43781
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/zork/variants/baseboard/devicetree_dalboz.cb b/src/mainboard/google/zork/variants/baseboard/devicetree_dalboz.cb
index e355b5b..4a01a12 100644
--- a/src/mainboard/google/zork/variants/baseboard/devicetree_dalboz.cb
+++ b/src/mainboard/google/zork/variants/baseboard/devicetree_dalboz.cb
@@ -51,6 +51,8 @@
register "xhci0_force_gen1" = "0"
+ register "has_usb2_phy_tune_params" = "1"
+
# Controller0 Port0 Default
register "usb_2_port_0_tune_params" = "{
.com_pds_tune = 0x03,