iwlwifi: allow disabling LAR via module param

This module parameter is useful for debugging NVM and LAR related issues.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

4 files changed, 17 insertions, 6 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-drv.c b/drivers/net/wireless/iwlwifi/iwl-drv.c
index 141331d41abf..f1d73d5e6eff 100644
--- a/drivers/net/wireless/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/iwlwifi/iwl-drv.c
@@ -1546,6 +1546,10 @@ module_param_named(d0i3_disable, iwlwifi_mod_params.d0i3_disable,
                    bool, S_IRUGO);
 MODULE_PARM_DESC(d0i3_disable, "disable d0i3 functionality (default: Y)");
 
+module_param_named(lar_disable, iwlwifi_mod_params.lar_disable,
+                   bool, S_IRUGO);
+MODULE_PARM_DESC(lar_disable, "disable LAR functionality (default: N)");
+
 module_param_named(uapsd_disable, iwlwifi_mod_params.uapsd_disable,
                    bool, S_IRUGO | S_IWUSR);
 #ifdef CONFIG_IWLWIFI_UAPSD
diff --git a/drivers/net/wireless/iwlwifi/iwl-modparams.h b/drivers/net/wireless/iwlwifi/iwl-modparams.h
index e8eabd21ccfe..ac2b90df8413 100644
--- a/drivers/net/wireless/iwlwifi/iwl-modparams.h
+++ b/drivers/net/wireless/iwlwifi/iwl-modparams.h
@@ -103,6 +103,7 @@ enum iwl_disable_11n {
  * @debug_level: levels are IWL_DL_*
  * @ant_coupling: antenna coupling in dB, default = 0
  * @d0i3_disable: disable d0i3, default = 1,
+ * @lar_disable: disable LAR (regulatory), default = 0
  * @fw_monitor: allow to use firmware monitor
  */
 struct iwl_mod_params {
@@ -121,6 +122,7 @@ struct iwl_mod_params {
         char *nvm_file;
         bool uapsd_disable;
         bool d0i3_disable;
+        bool lar_disable;
         bool fw_monitor;
 };
 
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index a196c7859086..207c3a847ed4 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -917,6 +917,10 @@ static inline bool iwl_mvm_is_lar_supported(struct iwl_mvm *mvm)
         bool nvm_lar = mvm->nvm_data->lar_enabled;
         bool tlv_lar = mvm->fw->ucode_capa.capa[0] &
                 IWL_UCODE_TLV_CAPA_LAR_SUPPORT;
+
+        if (iwlwifi_mod_params.lar_disable)
+                return false;
+
         /*
          * Enable LAR only if it is supported by the FW (TLV) &&
          * enabled in the NVM
diff --git a/drivers/net/wireless/iwlwifi/mvm/nvm.c b/drivers/net/wireless/iwlwifi/mvm/nvm.c
index eb40c89624d3..5a16e0d79352 100644
--- a/drivers/net/wireless/iwlwifi/mvm/nvm.c
+++ b/drivers/net/wireless/iwlwifi/mvm/nvm.c
@@ -264,7 +264,7 @@ iwl_parse_nvm_sections(struct iwl_mvm *mvm)
 {
         struct iwl_nvm_section *sections = mvm->nvm_sections;
         const __le16 *hw, *sw, *calib, *regulatory, *mac_override, *phy_sku;
-        bool is_family_8000_a_step = false;
+        bool is_family_8000_a_step = false, lar_enabled;
 
         /* Checking for required sections */
         if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
@@ -312,13 +312,14 @@ iwl_parse_nvm_sections(struct iwl_mvm *mvm)
                 (const __le16 *)sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data;
         phy_sku = (const __le16 *)sections[NVM_SECTION_TYPE_PHY_SKU].data;
 
+        lar_enabled = !iwlwifi_mod_params.lar_disable &&
+                      (mvm->fw->ucode_capa.capa[0] &
+                       IWL_UCODE_TLV_CAPA_LAR_SUPPORT);
+
         return iwl_parse_nvm_data(mvm->trans->dev, mvm->cfg, hw, sw, calib,
                                   regulatory, mac_override, phy_sku,
-                                  mvm->fw->valid_tx_ant,
-                                  mvm->fw->valid_rx_ant,
-                                  mvm->fw->ucode_capa.capa[0] &
-                                  IWL_UCODE_TLV_CAPA_LAR_SUPPORT,
-                                  is_family_8000_a_step);
+                                  mvm->fw->valid_tx_ant, mvm->fw->valid_rx_ant,
+                                  lar_enabled, is_family_8000_a_step);
 }
 
 #define MAX_NVM_FILE_LEN        16384