From b6b5afebfab6db6a2e451309945235e51b89d04d Mon Sep 17 00:00:00 2001
From: Matt DeVillier <matt.devillier@gmail.com>
Date: Mon, 31 Jul 2023 11:46:07 -0500
Subject: [PATCH] UefiPayloadPkg/PLatformHookLib: Set PcdSerialClockRate using
 HOB data

Fixes serial output on platforms using coreboot and a non-default clock
rate such as AMD Picasso and newer.

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
---
 UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c   | 7 +++++++
 UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf | 1 +
 2 files changed, 8 insertions(+)

diff --git a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
index efaab326bb687..70569ec995eac 100644
--- a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
+++ b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c
@@ -94,6 +94,13 @@ PlatformHookSerialPortInitialize (
       return Status;
     }
 
+    if (SerialPortInfo->Header.Revision >= 2) {
+      Status = PcdSet32S (PcdSerialClockRate, SerialPortInfo->ClockRate);
+      if (RETURN_ERROR (Status)) {
+        return Status;
+      }
+    }
+
     return RETURN_SUCCESS;
   }
 
diff --git a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
index 7ac6bfa1b1b08..e2908cfbca249 100644
--- a/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
+++ b/UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.inf
@@ -38,3 +38,4 @@
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase    ## PRODUCES
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialBaudRate        ## PRODUCES
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterStride  ## PRODUCES
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialClockRate       ## PRODUCES