linux-kernel - Re: [PATCH] olpc: fix model detection without OFW

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Message-ID: <20090214214312.GB31928@elte.hu>
Date:	Sat, 14 Feb 2009 22:43:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Chris Ball <cjb@...top.org>,
	Harvey Harrison <harvey.harrison@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] olpc: fix model detection without OFW


* Andres Salomon <dilinger@...ued.net> wrote:

> As discussed on IRC, this has the Dilinger Seal Of Approval (tm).
> 
> Acked-by: Andres Salomon <dilinger@...ian.org>

> On Fri, 13 Feb 2009 20:56:18 -0500
> Chris Ball <cjb@...top.org> wrote:
> 
> > Harvey's endianness patch (e51a1ac2dfca9ad869471e88f828281db7e810c0)

> > breaks model comparison on OLPC; the value 0xc2 needs to be scaled
> > up by olpc_board().  The pre-patch version was wrong, but accidentally
> > worked anyway (big-endian 0xc2 is big enough to satisfy all other
> > board revisions, but little endian 0xc2 is not).
> > 
> > Signed-off-by: Chris Ball <cjb@...top.org>

Applied to tip:x86/urgent [for v2.6.29], thanks guys!

Did i get the impact-line below right?

	Ingo

---------------->
>From 307250cda516547c0b0fe70dc3a3626bd82820cc Mon Sep 17 00:00:00 2001
From: Chris Ball <cjb@...top.org>
Date: Fri, 13 Feb 2009 20:56:18 -0500
Subject: [PATCH] x86, olpc: fix model detection without OFW

Impact: make certain OLPC-board revision based quirks [mouse, sound] work properly

Harvey's endianness patch (e51a1ac2dfca9ad869471e88f828281db7e810c0)
breaks model comparison on OLPC; the value 0xc2 needs to be scaled
up by olpc_board().  The pre-patch version was wrong, but accidentally
worked anyway (big-endian 0xc2 is big enough to satisfy all other
board revisions, but little endian 0xc2 is not).

Signed-off-by: Chris Ball <cjb@...top.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Acked-by: Andres Salomon <dilinger@...ued.net>
Cc: Harvey Harrison <harvey.harrison@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/olpc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/olpc.c b/arch/x86/kernel/olpc.c
index 7a13fac..4006c52 100644
--- a/arch/x86/kernel/olpc.c
+++ b/arch/x86/kernel/olpc.c
@@ -203,7 +203,7 @@ static void __init platform_detect(void)
 static void __init platform_detect(void)
 {
 	/* stopgap until OFW support is added to the kernel */
-	olpc_platform_info.boardrev = 0xc2;
+	olpc_platform_info.boardrev = olpc_board(0xc2);
 }
 #endif
 
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