diff options
| author | Ayala Barazani <ayala.barazani@intel.com> | 2023-01-27 00:28:20 +0200 |
|---|---|---|
| committer | Gregory Greenman <gregory.greenman@intel.com> | 2023-01-30 13:00:19 +0200 |
| commit | 09b4c35d73a59c092cf8466958b62cf896786472 (patch) | |
| tree | 29c627d717ba063fbd4364e508acd679b888cad7 /drivers/net/wireless/intel/iwlwifi/fw/uefi.c | |
| parent | 9ad1e7e5b0c488e4518edd698238a87ac6a73caa (diff) | |
wifi: iwlwifi: mvm: Support STEP equalizer settings from BIOS.
Read the STEP equalizer parameters from the BIOS during init
and transfer it to the firmware.
This table provides values to configure an equalizer at the transmitter
that can be used to compensate for PCB channel attenuation.
Signed-off-by: Ayala Barazani <ayala.barazani@intel.com>
Link: https://lore.kernel.org/r/20230127002430.f25f871c5e17.I8390ab916c8f681229433ebc576ed37a594c6d30@changeid
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/uefi.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/fw/uefi.c | 59 |
1 files changed, 58 insertions, 1 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c index 6d408cd0f517..0b6f694cf30d 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/uefi.c +++ b/drivers/net/wireless/intel/iwlwifi/fw/uefi.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* - * Copyright(c) 2021 Intel Corporation + * Copyright(c) 2021-2022 Intel Corporation */ #include "iwl-drv.h" @@ -246,6 +246,63 @@ void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len) return data; } +static int iwl_uefi_step_parse(struct uefi_cnv_common_step_data *common_step_data, + struct iwl_trans *trans) +{ + if (common_step_data->revision != 1) + return -EINVAL; + + trans->mbx_addr_0_step = (u32)common_step_data->revision | + (u32)common_step_data->cnvi_eq_channel << 8 | + (u32)common_step_data->cnvr_eq_channel << 16 | + (u32)common_step_data->radio1 << 24; + trans->mbx_addr_1_step = (u32)common_step_data->radio2; + return 0; +} + +void iwl_uefi_get_step_table(struct iwl_trans *trans) +{ + struct uefi_cnv_common_step_data *data; + unsigned long package_size; + efi_status_t status; + int ret; + + if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210) + return; + + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) + return; + + /* TODO: we hardcode a maximum length here, because reading + * from the UEFI is not working. To implement this properly, + * we have to call efivar_entry_size(). + */ + package_size = IWL_HARDCODED_STEP_SIZE; + + data = kmalloc(package_size, GFP_KERNEL); + if (!data) + return; + + status = efi.get_variable(IWL_UEFI_STEP_NAME, &IWL_EFI_VAR_GUID, + NULL, &package_size, data); + if (status != EFI_SUCCESS) { + IWL_DEBUG_FW(trans, + "STEP UEFI variable not found 0x%lx\n", status); + goto out_free; + } + + IWL_DEBUG_FW(trans, "Read STEP from UEFI with size %lu\n", + package_size); + + ret = iwl_uefi_step_parse(data, trans); + if (ret < 0) + IWL_DEBUG_FW(trans, "Cannot read STEP tables. rev is invalid\n"); + +out_free: + kfree(data); +} +IWL_EXPORT_SYMBOL(iwl_uefi_get_step_table); + #ifdef CONFIG_ACPI static int iwl_uefi_sgom_parse(struct uefi_cnv_wlan_sgom_data *sgom_data, struct iwl_fw_runtime *fwrt) |