From 10645167b8cf68a21e1944444c6278d9c92835c4 Mon Sep 17 00:00:00 2001
From: Nikita Krapivin <33228822+nkrapivin@users.noreply.github.com>
Date: Thu, 22 Mar 2018 02:07:30 +0500
Subject: [PATCH] [I8042PRT] Enable keyboard clock explicitly (fixes Lenovo
 ACPI bug). CORE-14256 (#434)

---
 drivers/input/i8042prt/i8042prt.h | 2 ++
 drivers/input/i8042prt/pnp.c      | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/input/i8042prt/i8042prt.h b/drivers/input/i8042prt/i8042prt.h
index acae330eccd..71be9823265 100644
--- a/drivers/input/i8042prt/i8042prt.h
+++ b/drivers/input/i8042prt/i8042prt.h
@@ -223,6 +223,8 @@ typedef struct _I8042_HOOK_WORKITEM
 #define MOUSE_ENAB         0xA8
 #define MOUSE_LINE_TEST    0xA9
 #define CTRL_SELF_TEST     0xAA
+#define KBD_CLK_DISABLE    0xAD
+#define KBD_CLK_ENABLE     0xAE
 #define CTRL_WRITE_MOUSE   0xD4
 
 /*-----------------------------------------------------
diff --git a/drivers/input/i8042prt/pnp.c b/drivers/input/i8042prt/pnp.c
index b95dc9a98aa..e5fe57b2080 100644
--- a/drivers/input/i8042prt/pnp.c
+++ b/drivers/input/i8042prt/pnp.c
@@ -274,6 +274,10 @@ i8042ConnectKeyboardInterrupt(
     TRACE_(I8042PRT, "i8042ConnectKeyboardInterrupt()\n");
 
     PortDeviceExtension = DeviceExtension->Common.PortDeviceExtension;
+
+    // Enable keyboard clock line
+    i8042Write(PortDeviceExtension, PortDeviceExtension->ControlPort, KBD_CLK_ENABLE);
+
     DirqlMax = MAX(
         PortDeviceExtension->KeyboardInterrupt.Dirql,
         PortDeviceExtension->MouseInterrupt.Dirql);