linux-kernel - Re: [PATCH] i2c: piix4: Fix SMBus port selection for AMD Family 17h chips

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Message-ID: <20171013190100.wjmjwyjmj6nt53i3@ninjato>
Date:   Fri, 13 Oct 2017 21:01:00 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: piix4: Fix SMBus port selection for AMD Family 17h
 chips

On Sat, Jul 15, 2017 at 04:51:26PM -0700, Guenter Roeck wrote:
> AMD Family 17h uses the KERNCZ SMBus controller. While its documentation
> is not publicly available, it is documented in the BIOS and Kernel
> Developer’s Guide for AMD Family 15h Models 60h-6Fh Processors.
> 
> On this SMBus controller, the port select register is at PMx register
> 0x02, bit 4:3 (PMx00 register bit 20:19).
> 
> Without this patch, the 4 SMBus channels on AMD Family 17h chips are
> mirrored and report the same chips on all channels.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Applied to for-current, thanks!


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