treewide: capitalize 'USB'

Change-Id: I7650786ea50465a4c2d11de948fdb81f4e509772
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39100
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/apollolake/chip.c b/src/soc/intel/apollolake/chip.c
index b9c5a4f..03e6dbd 100644
--- a/src/soc/intel/apollolake/chip.c
+++ b/src/soc/intel/apollolake/chip.c
@@ -842,7 +842,7 @@
 
 		/*
 		 * Override GLK xhci clock gating register(XHCLKGTEN) to
-		 * mitigate usb device suspend and resume failure.
+		 * mitigate USB device suspend and resume failure.
 		 */
 		if (CONFIG(SOC_INTEL_GLK)) {
 			uint32_t *cfg;
diff --git a/src/soc/intel/common/block/xhci/elog.c b/src/soc/intel/common/block/xhci/elog.c
index 0fd41bf..d8ee29c 100644
--- a/src/soc/intel/common/block/xhci/elog.c
+++ b/src/soc/intel/common/block/xhci/elog.c
@@ -84,7 +84,7 @@
 		/*
 		 * Check if CSC bit is set and port is capable of wake on
 		 * connect/disconnect to identify if the port caused wake
-		 * event for usb attach/detach.
+		 * event for USB attach/detach.
 		 */
 		if (pch_xhci_csc_set(port_status) &&
 		    pch_xhci_wake_capable(port_status)) {
@@ -95,7 +95,7 @@
 
 		/*
 		 * Check if PLC is set and PLS indicates resume to identify if
-		 * the port caused wake event for usb activity.
+		 * the port caused wake event for USB activity.
 		 */
 		if (pch_xhci_plc_set(port_status) &&
 		    pch_xhci_resume(port_status)) {