From 3ff11aaa507aa222e76aa2517efc9786494994ed Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Fri, 17 Jun 2016 02:13:17 -0700
Subject: [PATCH] x86: baytrail: acpi: Hide internal UART per GNVS setting
If global NVS says internal UART is not enabled, hide it in the ASL
code so that OS won't see it.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: George McCollister <george.mccollister@gmail.com>
Tested-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
.../include/asm/arch-baytrail/acpi/lpc.asl | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl b/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl
index 22f0d68f4d..fe34d3271c 100644
--- a/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl
+++ b/arch/x86/include/asm/arch-baytrail/acpi/lpc.asl
@@ -119,17 +119,14 @@ Device (LPCB)
Method(_STA, 0, Serialized)
{
- /*
- * TODO:
- *
- * Need to hide the internal UART depending on whether
- * internal UART is enabled or not so that external
- * SuperIO UART can be exposed to system.
- */
- Store(1, UI3E)
- Store(1, UI4E)
- Store(1, C1EN)
- Return (STA_VISIBLE)
+ If (LEqual(IURE, 1)) {
+ Store(1, UI3E)
+ Store(1, UI4E)
+ Store(1, C1EN)
+ Return (STA_VISIBLE)
+ } Else {
+ Return (STA_MISSING)
+ }
}
--
2.39.5