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author | Dave Airlie <airlied@redhat.com> | 2023-12-19 22:59:40 +0300 |
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committer | Dave Airlie <airlied@redhat.com> | 2023-12-19 22:59:41 +0300 |
commit | d2be61f8438feb2e356187acdfeef26fd777602a (patch) | |
tree | 0b799793dd72b5f8e39bb88b85408d27353ad766 /Documentation | |
parent | 48b272853e5ca6680eb7d019347126923da1a2eb (diff) | |
parent | 669080888691c312cc926322a7b24600121c90fb (diff) | |
download | linux-d2be61f8438feb2e356187acdfeef26fd777602a.tar.xz |
Merge tag 'amd-drm-next-6.8-2023-12-15' of https://gitlab.freedesktop.org/agd5f/linux into drm-next
amd-drm-next-6.8-2023-12-15:
amdgpu:
- Suspend fixes
- Misc code cleanups
- JPEG fix
- Add AMD specific color management (protected by AMD_PRIVATE_COLOR)
- UHBR13.5 cable fixes
- Misc display fixes
- Display WB fixes
- PSR fixes
- XGMI fix
- ACPI WBRF support for handling potential RF interference from GPU clocks
- Enable tunneling on high priority compute queues
- drm_edid.h include cleanup
- VPE DPM support
- SMU 13 fixes
- Fix possible double frees in error paths
- Misc fixes
amdkfd:
- Support import and export of dma-bufs using GEM handles
- MES shader debugger fixes
- SVM fixes
radeon:
- drm_edid.h include cleanup
- Misc code cleanups
- Fix possible memory leak in error path
drm:
- Increase max objects to accomodate new color props
- Make replace_property_blob_from_id a DRM helper
- Track color management changes per plane
platform-x86:
- Merge immutable branch from Hans for platform dependencies for WBRF to coordinate
merge of WBRF feature across wifi, platform, and GPU
Signed-off-by: Dave Airlie <airlied@redhat.com>
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From: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231215193519.5040-1-alexander.deucher@amd.com
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/driver-api/index.rst | 1 | ||||
-rw-r--r-- | Documentation/driver-api/wbrf.rst | 78 |
2 files changed, 79 insertions, 0 deletions
diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst index f549a68951d7..8bc4ebe7a36f 100644 --- a/Documentation/driver-api/index.rst +++ b/Documentation/driver-api/index.rst @@ -115,6 +115,7 @@ available subsections can be seen below. hte/index wmi dpll + wbrf .. only:: subproject and html diff --git a/Documentation/driver-api/wbrf.rst b/Documentation/driver-api/wbrf.rst new file mode 100644 index 000000000000..f48bfa029813 --- /dev/null +++ b/Documentation/driver-api/wbrf.rst @@ -0,0 +1,78 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +================================= +WBRF - Wifi Band RFI Mitigations +================================= + +Due to electrical and mechanical constraints in certain platform designs +there may be likely interference of relatively high-powered harmonics of +the GPU memory clocks with local radio module frequency bands used by +certain Wifi bands. + +To mitigate possible RFI interference producers can advertise the +frequencies in use and consumers can use this information to avoid using +these frequencies for sensitive features. + +When a platform is known to have this issue with any contained devices, +the platform designer will advertise the availability of this feature via +ACPI devices with a device specific method (_DSM). +* Producers with this _DSM will be able to advertise the frequencies in use. +* Consumers with this _DSM will be able to register for notifications of +frequencies in use. + +Some general terms +================== + +Producer: such component who can produce high-powered radio frequency +Consumer: such component who can adjust its in-use frequency in +response to the radio frequencies of other components to mitigate the +possible RFI. + +To make the mechanism function, those producers should notify active use +of their particular frequencies so that other consumers can make relative +internal adjustments as necessary to avoid this resonance. + +ACPI interface +============== + +Although initially used by for wifi + dGPU use cases, the ACPI interface +can be scaled to any type of device that a platform designer discovers +can cause interference. + +The GUID used for the _DSM is 7B7656CF-DC3D-4C1C-83E9-66E721DE3070. + +3 functions are available in this _DSM: + +* 0: discover # of functions available +* 1: record RF bands in use +* 2: retrieve RF bands in use + +Driver programming interface +============================ + +.. kernel-doc:: drivers/platform/x86/amd/wbrf.c + +Sample Usage +============= + +The expected flow for the producers: +1. During probe, call `acpi_amd_wbrf_supported_producer` to check if WBRF +can be enabled for the device. +2. On using some frequency band, call `acpi_amd_wbrf_add_remove` with 'add' +param to get other consumers properly notified. +3. Or on stopping using some frequency band, call +`acpi_amd_wbrf_add_remove` with 'remove' param to get other consumers notified. + +The expected flow for the consumers: +1. During probe, call `acpi_amd_wbrf_supported_consumer` to check if WBRF +can be enabled for the device. +2. Call `amd_wbrf_register_notifier` to register for notification +of frequency band change(add or remove) from other producers. +3. Call the `amd_wbrf_retrieve_freq_band` initally to retrieve +current active frequency bands considering some producers may broadcast +such information before the consumer is up. +4. On receiving a notification for frequency band change, run +`amd_wbrf_retrieve_freq_band` again to retrieve the latest +active frequency bands. +5. During driver cleanup, call `amd_wbrf_unregister_notifier` to +unregister the notifier. |