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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 this, AMD has introduced a mechanism that devices can use to notify active use of particular frequencies so that other devices can make relative internal adjustments as necessary to avoid this resonance. Co-developed-by: Evan Quan <quanliangl@hotmail.com> Signed-off-by: Evan Quan <quanliangl@hotmail.com> Signed-off-by: Ma Jun <Jun.Ma2@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Wifi Band Exclusion Interface (AMD ACPI Implementation)
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* Copyright (C) 2023 Advanced Micro Devices
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*/
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#ifndef _ACPI_AMD_WBRF_H
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#define _ACPI_AMD_WBRF_H
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#include <linux/device.h>
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#include <linux/notifier.h>
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/* The maximum number of frequency band ranges */
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#define MAX_NUM_OF_WBRF_RANGES 11
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/* Record actions */
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#define WBRF_RECORD_ADD 0x0
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#define WBRF_RECORD_REMOVE 0x1
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/**
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* struct freq_band_range - Wifi frequency band range definition
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* @start: start frequency point (in Hz)
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* @end: end frequency point (in Hz)
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*/
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struct freq_band_range {
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u64 start;
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u64 end;
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};
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/**
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* struct wbrf_ranges_in_out - wbrf ranges info
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* @num_of_ranges: total number of band ranges in this struct
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* @band_list: array of Wifi band ranges
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*/
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struct wbrf_ranges_in_out {
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u64 num_of_ranges;
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struct freq_band_range band_list[MAX_NUM_OF_WBRF_RANGES];
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};
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/**
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* enum wbrf_notifier_actions - wbrf notifier actions index
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* @WBRF_CHANGED: there was some frequency band updates. The consumers
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* should retrieve the latest active frequency bands.
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*/
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enum wbrf_notifier_actions {
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WBRF_CHANGED,
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};
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#if IS_ENABLED(CONFIG_AMD_WBRF)
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bool acpi_amd_wbrf_supported_producer(struct device *dev);
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int acpi_amd_wbrf_add_remove(struct device *dev, uint8_t action, struct wbrf_ranges_in_out *in);
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bool acpi_amd_wbrf_supported_consumer(struct device *dev);
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int amd_wbrf_retrieve_freq_band(struct device *dev, struct wbrf_ranges_in_out *out);
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int amd_wbrf_register_notifier(struct notifier_block *nb);
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int amd_wbrf_unregister_notifier(struct notifier_block *nb);
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#else
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static inline
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bool acpi_amd_wbrf_supported_consumer(struct device *dev)
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{
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return false;
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}
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static inline
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int acpi_amd_wbrf_add_remove(struct device *dev, uint8_t action, struct wbrf_ranges_in_out *in)
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{
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return -ENODEV;
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}
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static inline
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bool acpi_amd_wbrf_supported_producer(struct device *dev)
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{
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return false;
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}
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static inline
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int amd_wbrf_retrieve_freq_band(struct device *dev, struct wbrf_ranges_in_out *out)
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{
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return -ENODEV;
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}
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static inline
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int amd_wbrf_register_notifier(struct notifier_block *nb)
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{
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return -ENODEV;
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}
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static inline
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int amd_wbrf_unregister_notifier(struct notifier_block *nb)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_AMD_WBRF */
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#endif /* _ACPI_AMD_WBRF_H */
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