linux-kernel - Re: [PATCH 1/2]: serial8250: Use native_io

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Message-ID: <4BA11EAA.20506@zytor.com>
Date:	Wed, 17 Mar 2010 11:25:46 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Simon Kagstrom <simon.kagstrom@...insight.net>
CC:	x86@...nel.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	alan@...ux.intel.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 1/2]: serial8250: Use native_io_delay on the x86

On 03/17/2010 05:30 AM, Simon Kagstrom wrote:
>   #ifdef __i386__
> -		outb(0xff, 0x080);
> +		native_io_delay();
>   #endif

There is something a lot more weird about this.  First of all, it's 
#ifdef'd out on all but __i386__ including x86-64; second, it looks like 
this is specific to synchronizing to the IER.

I'm wondering if the right thing isn't to add a dummy write to the SCR 
register (or similar.)

	-hpa
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