linux-kernel - Re: [PATCH v12 0/9] Enable Wifi RFI interference mitigation feature support

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Message-ID: <76d4f18e-a349-4337-a301-ffebb8f1c5e8@redhat.com>
Date:   Mon, 20 Nov 2023 11:54:16 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Ma, Jun" <majun@....com>, Ma Jun <Jun.Ma2@....com>,
        amd-gfx@...ts.freedesktop.org, lenb@...nel.org,
        johannes@...solutions.net, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        alexander.deucher@....com, Lijo.Lazar@....com,
        mario.limonciello@....com
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v12 0/9] Enable Wifi RFI interference mitigation feature
 support

Hi,

On 10/19/23 08:17, Ma, Jun wrote:
> ping...
> Any other comments?

Patches 1/9 and 2/9 look reasonable, once the questions about
use of the _DSM vs directly calling the WBRF ACPI method are
resolved I can merge patches 1/9 and 2/9 and create an immutable
feature branch based on 6.7-rc1 + these 2 patches.

I'll then also send a pull-request to the wifi /resp amdgpu
maintainers from this branch.

I see no acks / reviews from the wifi folks yet,
so once that immutable feature branch is ready the first
thing to do is try to get the wifi folks to review + merge WBRF
support.

Note I plan to not actually merge the feature branch
into for-next until the wifi folks are happy with the code.

This way if changes are necessary I can do a v2 feature branch
and the wifi folks can merge that instead.

Regards,

Hans




> On 10/17/2023 10:53 AM, Ma Jun wrote:
>> Due to electrical and mechanical constraints in certain platform designs there
>> may be likely interference of relatively high-powered harmonics of the (G-)DDR
>> memory clocks with local radio module frequency bands used by Wifi 6/6e/7. To
>> mitigate possible RFI interference we introuduced WBRF(Wifi Band RFI mitigation Feature).
>> Producers can advertise the frequencies in use and consumers can use this information
>> to avoid using these frequencies for sensitive features.
>>
>> The whole patch set is based on Linux 6.5.0. With some brief introductions
>> as below:
>> Patch1:      Document about WBRF
>> Patch2:      Core functionality setup for WBRF feature support
>> Patch3 - 4:  Bring WBRF support to wifi subsystem.
>> Patch5 - 9:  Bring WBRF support to AMD graphics driver.
>>
>> Evan Quan (7):
>>   cfg80211: expose nl80211_chan_width_to_mhz for wide sharing
>>   wifi: mac80211: Add support for WBRF features
>>   drm/amd/pm: update driver_if and ppsmc headers for coming wbrf feature
>>   drm/amd/pm: setup the framework to support Wifi RFI mitigation feature
>>   drm/amd/pm: add flood detection for wbrf events
>>   drm/amd/pm: enable Wifi RFI mitigation feature support for SMU13.0.0
>>   drm/amd/pm: enable Wifi RFI mitigation feature support for SMU13.0.7
>>
>> Ma Jun (2):
>>   Documentation/driver-api: Add document about WBRF mechanism
>>   platform/x86/amd: Add support for AMD ACPI based Wifi band RFI
>>     mitigation feature
>>
>>  Documentation/driver-api/wbrf.rst             |  71 +++
>>  drivers/gpu/drm/amd/amdgpu/amdgpu.h           |   2 +
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c       |  17 +
>>  drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c     | 214 +++++++++
>>  drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h |  33 ++
>>  .../inc/pmfw_if/smu13_driver_if_v13_0_0.h     |  14 +-
>>  .../inc/pmfw_if/smu13_driver_if_v13_0_7.h     |  14 +-
>>  .../pm/swsmu/inc/pmfw_if/smu_v13_0_0_ppsmc.h  |   3 +-
>>  .../pm/swsmu/inc/pmfw_if/smu_v13_0_7_ppsmc.h  |   3 +-
>>  drivers/gpu/drm/amd/pm/swsmu/inc/smu_types.h  |   3 +-
>>  drivers/gpu/drm/amd/pm/swsmu/inc/smu_v13_0.h  |   3 +
>>  .../gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c    |   9 +
>>  .../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c  |  60 +++
>>  .../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c  |  59 +++
>>  drivers/gpu/drm/amd/pm/swsmu/smu_internal.h   |   3 +
>>  drivers/platform/x86/amd/Kconfig              |  15 +
>>  drivers/platform/x86/amd/Makefile             |   1 +
>>  drivers/platform/x86/amd/wbrf.c               | 422 ++++++++++++++++++
>>  include/linux/acpi_amd_wbrf.h                 | 101 +++++
>>  include/linux/ieee80211.h                     |   1 +
>>  include/net/cfg80211.h                        |   8 +
>>  net/mac80211/Makefile                         |   2 +
>>  net/mac80211/chan.c                           |   9 +
>>  net/mac80211/ieee80211_i.h                    |   9 +
>>  net/mac80211/main.c                           |   2 +
>>  net/mac80211/wbrf.c                           | 105 +++++
>>  net/wireless/chan.c                           |   3 +-
>>  27 files changed, 1180 insertions(+), 6 deletions(-)
>>  create mode 100644 Documentation/driver-api/wbrf.rst
>>  create mode 100644 drivers/platform/x86/amd/wbrf.c
>>  create mode 100644 include/linux/acpi_amd_wbrf.h
>>  create mode 100644 net/mac80211/wbrf.c
>>
>