mb/google/volteer: Enable HotPlug on PCIe root port for the SD express
Enable HotPlug for the PCIe root port that the SD express is on so the
OS can re-train the link without needing a reboot if it goes down
unexpectedly at runtime.
BUG=b:156879564
BRANCH=master
TEST=enable HotPlug on Volteer Root Port 7 (SD express) and check in
linux that it is identified as a HotPlug capable root port
Signed-off-by: Nick Chen <nick_xr_chen@wistron.corp-partner.google.com>
Change-Id: Ie9d427dd297567f06123119a670b5ed2e1f73701
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42897
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
index 300fb7e..88aff01 100644
--- a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
@@ -86,6 +86,7 @@
# Enable SD Card PCIE 8 using clk 3
register "PcieRpEnable[7]" = "1"
register "PcieRpLtrEnable[7]" = "1"
+ register "PcieRpHotPlug[7]" = "1"
register "PcieClkSrcUsage[3]" = "7"
register "PcieClkSrcClkReq[3]" = "3"