Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses

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To: Wolfram Sang <wsa@xxxxxxxxxx>, Andy Shevchenko <andy.shevchenko@xxxxxxxxx>, Guenter Roeck <linux@xxxxxxxxxxxx>, Jean Delvare <jdelvare@xxxxxxx>, linux-i2c <linux-i2c@xxxxxxxxxxxxxxx>, linux-watchdog@xxxxxxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Robert Richter <rrichter@xxxxxxx>
Subject: Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
From: Terry Bowman <Terry.Bowman@xxxxxxx>
Date: Tue, 11 Jan 2022 08:13:05 -0600
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References: <20210715221828.244536-1-Terry.Bowman@amd.com> <20210907183720.6e0be6b6@endymion> <20211105170550.746443b9@endymion> <33a0cd08-a336-34b3-d36c-f827b8054e9e@amd.com> <c28ab909-99b4-b43c-e330-b07e35afb981@amd.com> <ebee1239-4ed4-8c68-54e0-f684cea71e93@roeck-us.net> <YdoG+en5Z/MaS/wu@ninjato> <CAHp75VfC2XsF2j=obXu7RLNZkKSsZ20eOH2-UMA9AoMAemKa9Q@mail.gmail.com> <Yd16cw0AaYcf7eSf@kunai>
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+Robert Richter

Hi Andy,

The cd6h/cd7h port I/O can be disabled on recent AMD processors and these
changes replace the cd6h/cd7h port I/O accesses with with MMIO accesses. 
I can provide more details or answer questions.

Regards,
Terry

On 1/11/22 6:39 AM, Wolfram Sang wrote:
> 
>> I have briefly read the discussion by the link you provided above in
>> this thread. I'm not sure I understand the issue and if Intel hardware
>> is affected. Is there any summary of the problem?
> 
> I guess the original patch description should explain it. You can find
> it here:
> 
> http://patchwork.ozlabs.org/project/linux-i2c/patch/20210715221828.244536-1-Terry.Bowman@xxxxxxx/
> 
> If this is not sufficient, hopefully Terry can provide more information?
>

Follow-Ups:
- Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
  - From: Andy Shevchenko

References:
- Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
  - From: Terry Bowman
- Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
  - From: Guenter Roeck
- Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
  - From: Wolfram Sang
- Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
  - From: Andy Shevchenko
- Re: [PATCH] i2c: piix4: Replace piix4_smbus driver's cd6h/cd7h port io accesses with mmio accesses
  - From: Wolfram Sang

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