third_party/iwlwifi/mvm/nvm.c

/******************************************************************************
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 * Copyright(c) 2018        Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <zircon/status.h>

#include "third_party/iwlwifi/fw/acpi.h"
#include "third_party/iwlwifi/iwl-csr.h"
#include "third_party/iwlwifi/iwl-eeprom-parse.h"
#include "third_party/iwlwifi/iwl-eeprom-read.h"
#include "third_party/iwlwifi/iwl-nvm-parse.h"
#include "third_party/iwlwifi/iwl-prph.h"
#include "third_party/iwlwifi/iwl-trans.h"
#include "third_party/iwlwifi/mvm/mvm.h"
#include "third_party/iwlwifi/platform/compiler.h"

#if 0   // NEEDS_PORTING
/*
 * prepare the NVM host command w/ the pointers to the nvm buffer
 * and send it to fw
 */
static int iwl_nvm_write_chunk(struct iwl_mvm* mvm, uint16_t section, uint16_t offset,
                               uint16_t length, const uint8_t* data) {
  struct iwl_nvm_access_cmd nvm_access_cmd = {
      .offset = cpu_to_le16(offset),
      .length = cpu_to_le16(length),
      .type = cpu_to_le16(section),
      .op_code = NVM_WRITE_OPCODE,
  };
  struct iwl_host_cmd cmd = {
      .id = NVM_ACCESS_CMD,
      .len = {sizeof(struct iwl_nvm_access_cmd), length},
      .flags = CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
      .data = {&nvm_access_cmd, data},
      /* data may come from vmalloc, so use _DUP */
      .dataflags = {0, IWL_HCMD_DFL_DUP},
  };
  struct iwl_rx_packet* pkt;
  struct iwl_nvm_access_resp* nvm_resp;
  int ret;

  ret = iwl_mvm_send_cmd(mvm, &cmd);
  if (ret) {
    return ret;
  }

  pkt = cmd.resp_pkt;
  /* Extract & check NVM write response */
  nvm_resp = (void*)pkt->data;
  if (le16_to_cpu(nvm_resp->status) != READ_NVM_CHUNK_SUCCEED) {
    IWL_ERR(mvm, "NVM access write command failed for section %u (status = 0x%x)\n", section,
            le16_to_cpu(nvm_resp->status));
    ret = -EIO;
  }

  iwl_free_resp(&cmd);
  return ret;
}
#endif  // NEEDS_PORTING

// To read a chunk in a section.
//
// Args:
//   section: the section index to read
//   offset: the offset to read (used to read NVM and to store returned value in 'data').
//   length: the length of 'data'.
//   [out] data: to store output data (starting from 'offset').
//   [out] bytes_read: return the actual bytes read from NVM.
static zx_status_t iwl_nvm_read_chunk(struct iwl_mvm* mvm, uint16_t section, uint16_t offset,
                                      uint16_t length, uint8_t* data, size_t* bytes_read) {
  struct iwl_nvm_access_cmd nvm_access_cmd = {
      .offset = cpu_to_le16(offset),
      .length = cpu_to_le16(length),
      .type = cpu_to_le16(section),
      .op_code = NVM_READ_OPCODE,
  };
  struct iwl_rx_packet* pkt;
  struct iwl_host_cmd cmd = {
      .id = NVM_ACCESS_CMD,
      .flags = CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
      .data =
          {
              &nvm_access_cmd,
          },
  };
  int offset_read;
  uint8_t* resp_data;

  cmd.len[0] = sizeof(struct iwl_nvm_access_cmd);

  iwl_assert_lock_held(&mvm->mutex);
  zx_status_t ret = iwl_mvm_send_cmd(mvm, &cmd);
  if (ret != ZX_OK) {
    return ret;
  }

  pkt = cmd.resp_pkt;

  /* Extract NVM response */
  struct iwl_nvm_access_resp* nvm_resp = (void*)pkt->data;
  int status = le16_to_cpu(nvm_resp->status);
  *bytes_read = le16_to_cpu(nvm_resp->length);
  offset_read = le16_to_cpu(nvm_resp->offset);
  resp_data = nvm_resp->data;
  if (status) {
    if ((offset != 0) && (status == READ_NVM_CHUNK_NOT_VALID_ADDRESS)) {
      /*
       * meaning of NOT_VALID_ADDRESS:
       * driver try to read chunk from address that is
       * multiple of 2K and got an error since addr is empty.
       * meaning of (offset != 0): driver already
       * read valid data from another chunk so this case
       * is not an error.
       */
      IWL_DEBUG_EEPROM(
          mvm->trans->dev,
          "NVM access command failed on offset 0x%x since that section size is multiple 2K\n",
          offset);
      *bytes_read = 0;
      ret = ZX_OK;
    } else {
      IWL_DEBUG_EEPROM(mvm->trans->dev, "NVM access command failed with status %d (device: %s)\n",
                       ret, mvm->cfg->name);
      ret = ZX_ERR_NOT_FOUND;
    }
    goto exit;
  }

  if (offset_read != offset) {
    IWL_ERR(mvm, "NVM ACCESS response with invalid offset %d\n", offset_read);
    ret = ZX_ERR_IO;
    goto exit;
  }

  /* Write data to NVM */
  memcpy(data + offset, resp_data, *bytes_read);

exit:
  iwl_free_resp(&cmd);
  return ret;
}

#if 0   // NEEDS_PORTING
static int iwl_nvm_write_section(struct iwl_mvm* mvm, uint16_t section, const uint8_t* data,
                                 uint16_t length) {
  int offset = 0;

  /* copy data in chunks of 2k (and remainder if any) */

  while (offset < length) {
    int chunk_size, ret;

    chunk_size = min(IWL_NVM_DEFAULT_CHUNK_SIZE, length - offset);

    ret = iwl_nvm_write_chunk(mvm, section, offset, chunk_size, data + offset);
    if (ret < 0) {
      return ret;
    }

    offset += chunk_size;
  }

  return 0;
}
#endif  // NEEDS_PORTING

/*
 * Reads an NVM section completely.
 * NICs prior to 7000 family doesn't have a real NVM, but just read
 * section 0 which is the EEPROM. Because the EEPROM reading is unlimited
 * by uCode, we need to manually check in this case that we don't
 * overflow and try to read more than the EEPROM size.
 * For 7000 family NICs, we supply the maximal size we can read, and
 * the uCode fills the response with as much data as we can,
 * without overflowing, so no check is needed.
 */
static zx_status_t iwl_nvm_read_section(struct iwl_mvm* mvm, uint16_t section, uint8_t* data,
                                        uint32_t size_read, uint16_t* bytes_returned) {
  uint16_t length;      // the size to read
  uint16_t offset = 0;  // the offset for next read

  /* Set nvm section read length */
  length = IWL_NVM_DEFAULT_CHUNK_SIZE;

  size_t bytes_read = length;

  /* Reading NVM sections require the mutex to be held */
  iwl_assert_lock_held(&mvm->mutex);

  /* Read the NVM until exhausted (reading less than requested) */
  while (bytes_read == length) {
    /* Check no memory assumptions fail and cause an overflow */
    if ((size_read + offset + length) > mvm->cfg->base_params->eeprom_size) {
      IWL_ERR(mvm, "EEPROM size is too small for NVM\n");
      return ZX_ERR_INVALID_ARGS;
    }

    zx_status_t ret = iwl_nvm_read_chunk(mvm, section, offset, length, data, &bytes_read);
    if (ret != ZX_OK) {
      IWL_DEBUG_EEPROM(mvm->trans->dev, "Cannot read NVM from section %d offset %u, length %d\n",
                       section, offset, length);
      return ret;
    }
    offset += bytes_read;
  }

  iwl_nvm_fixups(mvm->trans->hw_id, section, data, offset);

  *bytes_returned = offset;
  IWL_DEBUG_EEPROM(mvm->trans->dev, "NVM section %d read completed\n", section);
  return ZX_OK;
}

static struct iwl_nvm_data* iwl_parse_nvm_sections(struct iwl_mvm* mvm) {
  struct iwl_nvm_section* sections = mvm->nvm_sections;
  const __be16* hw;
  const __le16 *sw, *calib, *regulatory, *mac_override, *phy_sku;
  bool lar_enabled;
  int regulatory_type;

  /* Checking for required sections */
  if (mvm->trans->cfg->nvm_type != IWL_NVM_EXT) {
    if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
        !mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data) {
      IWL_ERR(mvm, "Can't parse empty OTP/NVM sections\n");
      return NULL;
    }
  } else {
    if (mvm->trans->cfg->nvm_type == IWL_NVM_SDP) {
      regulatory_type = NVM_SECTION_TYPE_REGULATORY_SDP;
    } else {
      regulatory_type = NVM_SECTION_TYPE_REGULATORY;
    }

    /* SW and REGULATORY sections are mandatory */
    if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data || !mvm->nvm_sections[regulatory_type].data) {
      IWL_ERR(mvm, "Can't parse empty family 8000 OTP/NVM sections\n");
      return NULL;
    }
    /* MAC_OVERRIDE or at least HW section must exist */
    if (!mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data &&
        !mvm->nvm_sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data) {
      IWL_ERR(mvm, "Can't parse mac_address, empty sections\n");
      return NULL;
    }

    /* PHY_SKU section is mandatory in B0 */
    if (!mvm->nvm_sections[NVM_SECTION_TYPE_PHY_SKU].data) {
      IWL_ERR(mvm, "Can't parse phy_sku in B0, empty sections\n");
      return NULL;
    }
  }

  hw = (const __be16*)sections[mvm->cfg->nvm_hw_section_num].data;
  sw = (const __le16*)sections[NVM_SECTION_TYPE_SW].data;
  calib = (const __le16*)sections[NVM_SECTION_TYPE_CALIBRATION].data;
  mac_override = (const __le16*)sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data;
  phy_sku = (const __le16*)sections[NVM_SECTION_TYPE_PHY_SKU].data;

  regulatory = mvm->trans->cfg->nvm_type == IWL_NVM_SDP
                   ? (const __le16*)sections[NVM_SECTION_TYPE_REGULATORY_SDP].data
                   : (const __le16*)sections[NVM_SECTION_TYPE_REGULATORY].data;

  lar_enabled = !iwlwifi_mod_params.lar_disable &&
                fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_LAR_SUPPORT);

  return iwl_parse_nvm_data(mvm->trans, mvm->cfg, hw, sw, calib, regulatory, mac_override, phy_sku,
                            mvm->fw->valid_tx_ant, mvm->fw->valid_rx_ant, lar_enabled);
}

#if 0   // NEEDS_PORTING
/* Loads the NVM data stored in mvm->nvm_sections into the NIC */
int iwl_mvm_load_nvm_to_nic(struct iwl_mvm* mvm) {
  int i, ret = 0;
  struct iwl_nvm_section* sections = mvm->nvm_sections;

  IWL_DEBUG_EEPROM(mvm->trans->dev, "'Write to NVM\n");

  for (i = 0; i < ARRAY_SIZE(mvm->nvm_sections); i++) {
    if (!mvm->nvm_sections[i].data || !mvm->nvm_sections[i].length) {
      continue;
    }
    ret = iwl_nvm_write_section(mvm, i, sections[i].data, sections[i].length);
    if (ret < 0) {
      IWL_ERR(mvm, "iwl_mvm_send_cmd failed: %d\n", ret);
      break;
    }
  }
  return ret;
}
#endif  // NEEDS_PORTING

zx_status_t iwl_nvm_init(struct iwl_mvm* mvm) {
  zx_status_t ret = ZX_OK;
  int section;
  uint32_t size_read = 0;
  uint8_t *nvm_buffer, *temp;

  iwl_assert_lock_held(&mvm->mutex);

  if (WARN_ON_ONCE(mvm->cfg->nvm_hw_section_num >= NVM_MAX_NUM_SECTIONS)) {
    return ZX_ERR_INVALID_ARGS;
  }

  /* load NVM values from nic */
  /* Read From FW NVM */
  IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from NVM\n");

  nvm_buffer = malloc(mvm->cfg->base_params->eeprom_size);
  if (!nvm_buffer) {
    return ZX_ERR_NO_MEMORY;
  }
  for (section = 0; section < NVM_MAX_NUM_SECTIONS; section++) {
    /* we override the constness for initial read */
    uint16_t bytes_returned;
    ret = iwl_nvm_read_section(mvm, section, nvm_buffer, size_read, &bytes_returned);
    if (ret == ZX_ERR_NOT_FOUND) {
      ret = ZX_OK;
      continue;
    }
    if (ret != ZX_OK) {
      break;
    }
    size_read += bytes_returned;
    temp = malloc(bytes_returned);
    if (!temp) {
      ret = ZX_ERR_NO_MEMORY;
      break;
    }
    memcpy(temp, nvm_buffer, bytes_returned);

    iwl_nvm_fixups(mvm->trans->hw_id, section, temp, bytes_returned);

    mvm->nvm_sections[section].data = temp;
    mvm->nvm_sections[section].length = bytes_returned;

#ifdef CPTCFG_IWLWIFI_DEBUGFS
    switch (section) {
      case NVM_SECTION_TYPE_SW:
        mvm->nvm_sw_blob.data = temp;
        mvm->nvm_sw_blob.size = ret;
        break;
      case NVM_SECTION_TYPE_CALIBRATION:
        mvm->nvm_calib_blob.data = temp;
        mvm->nvm_calib_blob.size = ret;
        break;
      case NVM_SECTION_TYPE_PRODUCTION:
        mvm->nvm_prod_blob.data = temp;
        mvm->nvm_prod_blob.size = ret;
        break;
      case NVM_SECTION_TYPE_PHY_SKU:
        mvm->nvm_phy_sku_blob.data = temp;
        mvm->nvm_phy_sku_blob.size = ret;
        break;
      default:
        if (section == mvm->cfg->nvm_hw_section_num) {
          mvm->nvm_hw_blob.data = temp;
          mvm->nvm_hw_blob.size = ret;
          break;
        }
    }
#endif
  }
  if (!size_read) {
    IWL_ERR(mvm, "OTP is blank\n");
  }
  free(nvm_buffer);

  /* Only if PNVM selected in the mod param - load external NVM  */
  if (mvm->nvm_file_name) {
    IWL_ERR(mvm, "Loading external NVM is not supported (%s)\n", mvm->nvm_file_name);
#if 0   // NEEDS_PORTING
    /* read External NVM file from the mod param */
    ret = iwl_read_external_nvm(mvm->trans, mvm->nvm_file_name, mvm->nvm_sections);
    if (ret) {
      const char* nvm_file_C = mvm->cfg->default_nvm_file_C_step;
      mvm->nvm_file_name = nvm_file_C;

      if ((ret == -EFAULT || ret == -ENOENT) && mvm->nvm_file_name) {
        /* in case nvm file was failed try again */
        ret = iwl_read_external_nvm(mvm->trans, mvm->nvm_file_name, mvm->nvm_sections);
        if (ret) {
          return ret;
        }
      } else {
        return ret;
      }
    }
#endif  // NEEDS_PORTING
    return ZX_ERR_NOT_SUPPORTED;
  }

  /* parse the relevant nvm sections */
  mvm->nvm_data = iwl_parse_nvm_sections(mvm);
  if (!mvm->nvm_data) {
    IWL_ERR(mvm, "the NVM data parsing failed\n");
    return ZX_ERR_NOT_FOUND;
  }
  IWL_DEBUG_EEPROM(mvm->trans->dev, "nvm version = %x\n", mvm->nvm_data->nvm_version);

  return ret;
}

zx_status_t iwl_mvm_update_mcc(struct iwl_mvm* mvm, const char* alpha2, enum iwl_mcc_source src_id,
                               struct iwl_mcc_update_resp** out_resp_cp) {
  struct iwl_mcc_update_cmd mcc_update_cmd = {
      .mcc = cpu_to_le16(alpha2[0] << 8 | alpha2[1]),
      .source_id = (uint8_t)src_id,
  };
  struct iwl_mcc_update_resp* resp_cp = NULL;
  struct iwl_rx_packet* pkt;
  struct iwl_host_cmd cmd = {
      .id = MCC_UPDATE_CMD,
      .flags = CMD_WANT_SKB,
      .data = {&mcc_update_cmd},
  };

  zx_status_t ret;
  uint32_t status;
  int resp_len, n_channels;
  uint16_t mcc;

  if (!iwl_mvm_is_lar_supported(mvm)) {
    IWL_WARN(mvm, "LAR is not supported. Ignore update MCC.\n");
    return ZX_ERR_NOT_SUPPORTED;
  }

  ZX_ASSERT(out_resp_cp);

  cmd.len[0] = sizeof(struct iwl_mcc_update_cmd);

  IWL_DEBUG_LAR(mvm, "send MCC update to FW with '%c%c' src = %d\n", alpha2[0], alpha2[1], src_id);

  ret = iwl_mvm_send_cmd(mvm, &cmd);
  if (ret != ZX_OK) {
    IWL_ERR(mvm, "MCC update command failed: %s\n", zx_status_get_string(ret));
    return ret;
  }

  pkt = cmd.resp_pkt;

  /* Extract MCC response */
  if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_MCC_UPDATE_11AX_SUPPORT)) {
    struct iwl_mcc_update_resp* mcc_resp = (void*)pkt->data;

    n_channels = le32_to_cpu(mcc_resp->n_channels);
    resp_len = sizeof(struct iwl_mcc_update_resp) + n_channels * sizeof(__le32);
    resp_cp = calloc(1, resp_len);
    if (!resp_cp) {
      ret = ZX_ERR_NO_MEMORY;
      goto exit;
    }
    memcpy(resp_cp, mcc_resp, resp_len);
  } else {
    struct iwl_mcc_update_resp_v3* mcc_resp_v3 = (void*)pkt->data;

    n_channels = le32_to_cpu(mcc_resp_v3->n_channels);
    resp_len = sizeof(struct iwl_mcc_update_resp) + n_channels * sizeof(__le32);
    resp_cp = calloc(1, resp_len);
    if (!resp_cp) {
      ret = ZX_ERR_NO_MEMORY;
      goto exit;
    }

    resp_cp->status = mcc_resp_v3->status;
    resp_cp->mcc = mcc_resp_v3->mcc;
    resp_cp->cap = cpu_to_le16(mcc_resp_v3->cap);
    resp_cp->source_id = mcc_resp_v3->source_id;
    resp_cp->time = mcc_resp_v3->time;
    resp_cp->geo_info = mcc_resp_v3->geo_info;
    resp_cp->n_channels = mcc_resp_v3->n_channels;
    memcpy(resp_cp->channels, mcc_resp_v3->channels, n_channels * sizeof(__le32));
  }

  status = le32_to_cpu(resp_cp->status);

  mcc = le16_to_cpu(resp_cp->mcc);

  /* W/A for a FW/NVM issue - returns 0x00 for the world domain */
  if (mcc == 0) {
    mcc = 0x3030; /* "00" - world */
    resp_cp->mcc = cpu_to_le16(mcc);
  }

  *out_resp_cp = resp_cp;

  IWL_DEBUG_LAR(mvm, "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') n_chans: %d\n", status, mcc,
                mcc >> 8, mcc & 0xff, n_channels);

exit:
  iwl_free_resp(&cmd);
  return ret;
}

zx_status_t iwl_mvm_init_mcc(struct iwl_mvm* mvm) {
  bool tlv_lar;
  bool nvm_lar;
  zx_status_t retval;
  wlanphy_country_t country;
  char mcc[3];

  if (mvm->cfg->nvm_type == IWL_NVM_EXT) {
    tlv_lar = fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_LAR_SUPPORT);
    nvm_lar = mvm->nvm_data->lar_enabled;
    if (tlv_lar != nvm_lar)
      IWL_INFO(mvm, "Conflict between TLV & NVM regarding enabling LAR (TLV = %s NVM =%s)\n",
               tlv_lar ? "enabled" : "disabled", nvm_lar ? "enabled" : "disabled");
  }

  if (!iwl_mvm_is_lar_supported(mvm)) {
    return ZX_OK;
  }

#if 0   // NEEDS_PORTING
  /*
   * try to replay the last set MCC to FW. If it doesn't exist,
   * queue an update to cfg80211 to retrieve the default alpha2 from FW.
   */
  retval = iwl_mvm_init_fw_regd(mvm);
  if (retval != ZX_ERR_NO_RESOURCES) {
    return retval;
  }
#endif  // NEEDS_PORTING

  /*
   * Driver regulatory hint for initial update, this also informs the
   * firmware we support wifi location updates.
   * Disallow scans that might crash the FW while the LAR regdomain
   * is not set.
   */
  mvm->lar_regdom_set = false;

  retval = iwl_mvm_get_current_regdomain(mvm, NULL, &country);
  if (retval != ZX_OK) {
    return ZX_ERR_BAD_STATE;
  }

  if (iwl_mvm_is_wifi_mcc_supported(mvm) && !iwl_acpi_get_mcc(mvm->dev, mcc)) {
    retval = iwl_mvm_get_regdomain(mvm, mcc, MCC_SOURCE_BIOS, NULL, &country);
    if (retval != ZX_OK) {
      return ZX_ERR_BAD_STATE;
    }
  }

#if 0   // NEEDS_PORTING
  retval = regulatory_set_wiphy_regd_sync_rtnl(mvm->hw->wiphy, regd);
  kfree(regd);
#endif  // NEEDS_PORTING

  return retval;
}

#if 0   // NEEDS_PORTING
void iwl_mvm_rx_chub_update_mcc(struct iwl_mvm* mvm, struct iwl_rx_cmd_buffer* rxb) {
  struct iwl_rx_packet* pkt = rxb_addr(rxb);
  struct iwl_mcc_chub_notif* notif = (void*)pkt->data;
  enum iwl_mcc_source src;
  char mcc[3];
  struct ieee80211_regdomain* regd;

  iwl_assert_lock_held(&mvm->mutex);

  if (iwl_mvm_is_vif_assoc(mvm) && notif->source_id == MCC_SOURCE_WIFI) {
    IWL_DEBUG_LAR(mvm, "Ignore mcc update while associated\n");
    return;
  }

  if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm))) {
    return;
  }

  mcc[0] = le16_to_cpu(notif->mcc) >> 8;
  mcc[1] = le16_to_cpu(notif->mcc) & 0xff;
  mcc[2] = '\0';
  src = notif->source_id;

  IWL_DEBUG_LAR(mvm, "RX: received chub update mcc cmd (mcc '%s' src %d)\n", mcc, src);
  regd = iwl_mvm_get_regdomain(mvm->hw->wiphy, mcc, src, NULL);
  if (IS_ERR_OR_NULL(regd)) {
    return;
  }

  regulatory_set_wiphy_regd(mvm->hw->wiphy, regd);
  kfree(regd);
}
#endif  // NEEDS_PORTING