package/kernel/mac80211/patches/ath10k/120-ath10k-fetch-calibration-data-via-nvmem-subsystem.patch

   1 From e2333703373e8b81294da5d1c73c30154f75b082 Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Fri, 15 Oct 2021 18:56:33 +0200
   4 Subject: [PATCH] ath10k: fetch (pre-)calibration data via nvmem subsystem
   5
   6 On most embedded ath10k devices (like range extenders,
   7 routers, accesspoints, ...) the calibration data is
   8 stored in a easily accessible MTD partitions named
   9 "ART", "caldata", "calibration", etc...
  10
  11 Since commit 4b361cfa8624 ("mtd: core: add OTP nvmem provider support"):
  12 MTD partitions and portions of them can be specified
  13 as potential nvmem-cells which are accessible through
  14 the nvmem subsystem.
  15
  16 This feature - together with an nvmem cell definition either
  17 in the platform data or via device-tree allows drivers to get
  18 the (pre-)calibration data which is required for initializing
  19 the WIFI.
  20
  21 Tested with Netgear EX6150v2 (IPQ4018)
  22
  23 Cc: Robert Marko <robimarko@gmail.com>
  24 Cc: Thibaut Varene <hacks@slashdirt.org>
  25 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  26 ---
  27 --- a/drivers/net/wireless/ath/ath10k/core.c
  28 +++ b/drivers/net/wireless/ath/ath10k/core.c
  29 @@ -12,6 +12,7 @@
  30  #include <linux/dmi.h>
  31  #include <linux/ctype.h>
  32  #include <linux/pm_qos.h>
  33 +#include <linux/nvmem-consumer.h>
  34  #include <asm/byteorder.h>
  35
  36  #include "core.h"
  37 @@ -935,7 +936,8 @@ static int ath10k_core_get_board_id_from
  38         }
  39
  40         if (ar->cal_mode == ATH10K_PRE_CAL_MODE_DT ||
  41 -           ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE)
  42 +           ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE ||
  43 +           ar->cal_mode == ATH10K_PRE_CAL_MODE_NVMEM)
  44                 bmi_board_id_param = BMI_PARAM_GET_FLASH_BOARD_ID;
  45         else
  46                 bmi_board_id_param = BMI_PARAM_GET_EEPROM_BOARD_ID;
  47 @@ -1726,7 +1728,8 @@ static int ath10k_download_and_run_otp(s
  48
  49         /* As of now pre-cal is valid for 10_4 variants */
  50         if (ar->cal_mode == ATH10K_PRE_CAL_MODE_DT ||
  51 -           ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE)
  52 +           ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE ||
  53 +           ar->cal_mode == ATH10K_PRE_CAL_MODE_NVMEM)
  54                 bmi_otp_exe_param = BMI_PARAM_FLASH_SECTION_ALL;
  55
  56         ret = ath10k_bmi_execute(ar, address, bmi_otp_exe_param, &result);
  57 @@ -1853,6 +1856,39 @@ out_free:
  58         return ret;
  59  }
  60
  61 +static int ath10k_download_cal_nvmem(struct ath10k *ar, const char *cell_name)
  62 +{
  63 +       struct nvmem_cell *cell;
  64 +       void *buf;
  65 +       size_t len;
  66 +       int ret;
  67 +
  68 +       cell = devm_nvmem_cell_get(ar->dev, cell_name);
  69 +       if (IS_ERR(cell)) {
  70 +               ret = PTR_ERR(cell);
  71 +               return ret;
  72 +       }
  73 +
  74 +       buf = nvmem_cell_read(cell, &len);
  75 +       if (IS_ERR(buf))
  76 +               return PTR_ERR(buf);
  77 +
  78 +       if (ar->hw_params.cal_data_len != len) {
  79 +               kfree(buf);
  80 +               ath10k_warn(ar, "invalid calibration data length in nvmem-cell '%s': %zu != %u\n",
  81 +                           cell_name, len, ar->hw_params.cal_data_len);
  82 +               return -EMSGSIZE;
  83 +       }
  84 +
  85 +       ret = ath10k_download_board_data(ar, buf, len);
  86 +       kfree(buf);
  87 +       if (ret)
  88 +               ath10k_warn(ar, "failed to download calibration data from nvmem-cell '%s': %d\n",
  89 +                           cell_name, ret);
  90 +
  91 +       return ret;
  92 +}
  93 +
  94  int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
  95                                      struct ath10k_fw_file *fw_file)
  96  {
  97 @@ -2087,6 +2123,18 @@ static int ath10k_core_pre_cal_download(
  98  {
  99         int ret;
 100
 101 +       ret = ath10k_download_cal_nvmem(ar, "pre-calibration");
 102 +       if (ret == 0) {
 103 +               ar->cal_mode = ATH10K_PRE_CAL_MODE_NVMEM;
 104 +               goto success;
 105 +       } else if (ret == -EPROBE_DEFER) {
 106 +               return ret;
 107 +       }
 108 +
 109 +       ath10k_dbg(ar, ATH10K_DBG_BOOT,
 110 +                  "boot did not find a pre-calibration nvmem-cell, try file next: %d\n",
 111 +                  ret);
 112 +
 113         ret = ath10k_download_cal_file(ar, ar->pre_cal_file);
 114         if (ret == 0) {
 115                 ar->cal_mode = ATH10K_PRE_CAL_MODE_FILE;
 116 @@ -2153,6 +2201,18 @@ static int ath10k_download_cal_data(stru
 117                    "pre cal download procedure failed, try cal file: %d\n",
 118                    ret);
 119
 120 +       ret = ath10k_download_cal_nvmem(ar, "calibration");
 121 +       if (ret == 0) {
 122 +               ar->cal_mode = ATH10K_CAL_MODE_NVMEM;
 123 +               goto done;
 124 +       } else if (ret == -EPROBE_DEFER) {
 125 +               return ret;
 126 +       }
 127 +
 128 +       ath10k_dbg(ar, ATH10K_DBG_BOOT,
 129 +                  "boot did not find a calibration nvmem-cell, try file next: %d\n",
 130 +                  ret);
 131 +
 132         ret = ath10k_download_cal_file(ar, ar->cal_file);
 133         if (ret == 0) {
 134                 ar->cal_mode = ATH10K_CAL_MODE_FILE;
 135 --- a/drivers/net/wireless/ath/ath10k/core.h
 136 +++ b/drivers/net/wireless/ath/ath10k/core.h
 137 @@ -877,8 +877,10 @@ enum ath10k_cal_mode {
 138         ATH10K_CAL_MODE_FILE,
 139         ATH10K_CAL_MODE_OTP,
 140         ATH10K_CAL_MODE_DT,
 141 +       ATH10K_CAL_MODE_NVMEM,
 142         ATH10K_PRE_CAL_MODE_FILE,
 143         ATH10K_PRE_CAL_MODE_DT,
 144 +       ATH10K_PRE_CAL_MODE_NVMEM,
 145         ATH10K_CAL_MODE_EEPROM,
 146  };
 147
 148 @@ -898,10 +900,14 @@ static inline const char *ath10k_cal_mod
 149                 return "otp";
 150         case ATH10K_CAL_MODE_DT:
 151                 return "dt";
 152 +       case ATH10K_CAL_MODE_NVMEM:
 153 +               return "nvmem";
 154         case ATH10K_PRE_CAL_MODE_FILE:
 155                 return "pre-cal-file";
 156         case ATH10K_PRE_CAL_MODE_DT:
 157                 return "pre-cal-dt";
 158 +       case ATH10K_PRE_CAL_MODE_NVMEM:
 159 +               return "pre-cal-nvmem";
 160         case ATH10K_CAL_MODE_EEPROM:
 161                 return "eeprom";
 162         }