linux-kernel - Re: [V9 1/9] drivers core: Add support for Wifi band RF mitigations

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Message-ID: <2328cf53-849d-46a1-87e6-436e3a1f5fd8@amd.com>
Date:   Fri, 18 Aug 2023 17:49:14 -0500
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Evan Quan <evan.quan@....com>, Andrew Lunn <andrew@...n.ch>
Cc:     rafael@...nel.org, lenb@...nel.org, johannes@...solutions.net,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, alexander.deucher@....com,
        rdunlap@...radead.org, quic_jjohnson@...cinc.com, horms@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [V9 1/9] drivers core: Add support for Wifi band RF mitigations

On 8/18/2023 4:24 PM, Greg KH wrote:
> On Fri, Aug 18, 2023 at 11:26:11AM +0800, Evan Quan wrote:
>>   drivers/base/Makefile                         |   1 +
>>   drivers/base/wbrf.c                           | 280 ++++++++++++++++++
> 
> Why is a wifi-specific thing going into drivers/base/?
> 
> confused,
> 
> greg k-h

The original problem statement was at a high level 'there can be 
interference between different devices operating at high frequencies'. 
The original patches introduced some ACPI library code that enabled a 
mitigated for this interference between mac80211 devices and amdgpu devices.

Andrew Lunn wanted to see something more generic, so the series has 
morphed into base code for things to advertise frequencies in use and 
other things to listen to frequencies in use and react.

The idea is supposed to be that if the platform knows that these 
mitigations are needed then the producers send the frequencies in use, 
consumers react to them.  The AMD implementation of getting this info 
from the platform plugs into the base code (patch 2).

If users don't want this behavior they can turn it off on kernel command 
line.

If the platform doesn't know mitigations are needed but user wants to 
turn them on anyway they can turn it on kernel command line.