Revert TTY serial driver to upstream to allow PREEMPT_RT patching for kernel-rt upgrade (#13867)

Co-authored-by: Harshit Gupta <guptaharshit@microsoft.com>

Author: harshitgupta1337

SPECS-EXTENDED/kernel-rt/config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86_64 6.6.77.1 Kernel Configuration
+# Linux/x86_64 6.6.85.1 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="gcc (GCC) 13.2.0"
 CONFIG_CC_IS_GCC=y
@@ -7373,6 +7373,13 @@ CONFIG_CRYPTO_DRBG_HASH=y
 CONFIG_CRYPTO_DRBG_CTR=y
 CONFIG_CRYPTO_DRBG=y
 CONFIG_CRYPTO_JITTERENTROPY=y
+CONFIG_CRYPTO_JITTERENTROPY_MEMSIZE_2=y
+# CONFIG_CRYPTO_JITTERENTROPY_MEMSIZE_128 is not set
+# CONFIG_CRYPTO_JITTERENTROPY_MEMSIZE_1024 is not set
+# CONFIG_CRYPTO_JITTERENTROPY_MEMSIZE_8192 is not set
+CONFIG_CRYPTO_JITTERENTROPY_MEMORY_BLOCKS=64
+CONFIG_CRYPTO_JITTERENTROPY_MEMORY_BLOCKSIZE=32
+CONFIG_CRYPTO_JITTERENTROPY_OSR=3
 # CONFIG_CRYPTO_JITTERENTROPY_TESTINTERFACE is not set
 # end of Random number generation
 

SPECS-EXTENDED/kernel-rt/kernel-rt.signatures.json

@@ -1,10 +1,10 @@
 {
   "Signatures": {
     "cbl-mariner-ca-20211013.pem": "5ef124b0924cb1047c111a0ecff1ae11e6ad7cac8d1d9b40f98f99334121f0b0",
-    "config": "23d30e3d061d14ef091b301fba88fd559981b533e94fa5ae374e16fa023abc32",
+    "config": "96d8e41cf334f308715713d6e20656f8e1b8ac1475ceeb209f9e217b01447eed",
     "cpupower": "d7518767bf2b1110d146a49c7d42e76b803f45eb8bd14d931aa6d0d346fae985",
     "cpupower.service": "b057fe9e5d0e8c36f485818286b80e3eba8ff66ff44797940e99b1fd5361bb98",
     "sha512hmac-openssl.sh": "02ab91329c4be09ee66d759e4d23ac875037c3b56e5a598e32fd1206da06a27f",
-    "kernel-6.6.77.1.tar.gz": "2d9cce0c5a39c6be7fe272da6811acd4aa5fa386d9cd8f055b0b8110684c3028"
+    "kernel-6.6.85.1.tar.gz": "4dab471d68ce07dd31e925788c128ff1c7d9a6d2c7e0a073bd8e6701514cfee6"
   }
 }

SPECS-EXTENDED/kernel-rt/kernel-rt.spec

@@ -1,6 +1,6 @@
 %global security_hardening none
 %global sha512hmac bash %{_sourcedir}/sha512hmac-openssl.sh
-%global rt_version rt50
+%global rt_version rt53
 %define uname_r %{version}-%{rt_version}-%{release}
 %define mariner_version 3
 %define version_upstream %(echo %{version} | rev | cut -d'.' -f2- | rev)
@@ -23,7 +23,7 @@
 
 Summary:        Realtime Linux Kernel
 Name:           kernel-rt
-Version:        6.6.77.1
+Version:        6.6.85.1
 Release:        1%{?dist}
 License:        GPLv2
 Vendor:         Microsoft Corporation
@@ -37,10 +37,11 @@ Source3:        cbl-mariner-ca-20211013.pem
 Source4:        cpupower
 Source5:        cpupower.service
 
+Patch0:         reapply-serial-8250-adjust-fifo-mode-timeout.patch
 # When updating, make sure to grab the matching patch from
 # https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/
 # Also, remember to bump the global rt_version macro above ^
-Patch0:         patch-%{version_upstream}-%{rt_version}.patch
+Patch1:         patch-%{version_upstream}-%{rt_version}.patch
 
 BuildRequires:  audit-devel
 BuildRequires:  bash
@@ -161,6 +162,7 @@ manipulation of eBPF programs and maps.
 %prep
 %setup -q -n CBL-Mariner-Linux-Kernel-rolling-lts-mariner-%{mariner_version}-%{version}
 %patch 0 -p1
+%patch 1 -p1
 
 make mrproper
 
@@ -414,6 +416,10 @@ ln -sf linux-%{uname_r}.cfg /boot/mariner.cfg
 %{_sysconfdir}/bash_completion.d/bpftool
 
 %changelog
+* Sat May 22 2025 Harshit Gupta <guptaharshit@microsoft.com> - 6.6.85.1-1
+- Auto-upgrade to 6.6.85.1
+- Add reapply-serial-8250-adjust-fifo-mode-timeout.patch
+
 * Mon Feb 24 2025 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 6.6.77.1-1
 - Auto-upgrade to 6.6.77.1