From 59acc08fd95aefb5430458a08a82b15a4174ed74 Mon Sep 17 00:00:00 2001
From: "Antonino A. Daplas" <adaplas@gmail.com>
Date: Thu, 2 Aug 2007 18:16:46 +0800
Subject: [PATCH] [x86 setup] video setup: Fix VBE DDC reading

Add memory operand constraint and write-only modifier to the inline
assembly to effect the writing of the EDID block to boot_params.edid_info.

Without this, gcc would think the EDID query was dead code and would
eliminate it.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
 arch/i386/boot/video-vesa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/i386/boot/video-vesa.c b/arch/i386/boot/video-vesa.c
index e6aa9eb8d93a..f1bc71e948cf 100644
--- a/arch/i386/boot/video-vesa.c
+++ b/arch/i386/boot/video-vesa.c
@@ -268,7 +268,7 @@ void vesa_store_edid(void)
 	dx = 0;			/* EDID block number */
 	di =(size_t) &boot_params.edid_info; /* (ES:)Pointer to block */
 	asm(INT10
-	    : "+a" (ax), "+b" (bx), "+d" (dx)
+	    : "+a" (ax), "+b" (bx), "+d" (dx), "=m" (boot_params.edid_info)
 	    : "c" (cx), "D" (di)
 	    : "esi");
 #endif /* CONFIG_FIRMWARE_EDID */
-- 
2.34.1