iwlwifi: BZ Family BUS_MASTER_DISABLE_REQ code duplication

Remove redundant code which occurs anyway in a later stage and add
msleep(100) which is required after disable request.
Signed-off-by: Roee Goldfiner <roee.h.goldfiner@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211017162352.46183bcd6549.Ie05161496810d3f28fb9d1fecb5f8593889ed2c6@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c

@@ -131,21 +131,9 @@ void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans)
 	if (trans_pcie->is_down)
 		return;
 
-	if (trans->state >= IWL_TRANS_FW_STARTED) {
-		if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_BZ) {
-			iwl_set_bit(trans, CSR_GP_CNTRL,
-				    CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_REQ);
-			iwl_poll_bit(trans, CSR_GP_CNTRL,
-				     CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_STATUS,
-				     CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_STATUS,
-				     5000);
-			msleep(100);
-			iwl_set_bit(trans, CSR_GP_CNTRL,
-				    CSR_GP_CNTRL_REG_FLAG_SW_RESET);
-		} else if (trans_pcie->fw_reset_handshake) {
+	if (trans->state >= IWL_TRANS_FW_STARTED)
+		if (trans_pcie->fw_reset_handshake)
 			iwl_trans_pcie_fw_reset_handshake(trans);
-		}
-	}
 
 	trans_pcie->is_down = true;
 

drivers/net/wireless/intel/iwlwifi/pcie/trans.c

@@ -458,6 +458,7 @@ void iwl_pcie_apm_stop_master(struct iwl_trans *trans)
 				   CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_STATUS,
 				   CSR_GP_CNTRL_REG_FLAG_BUS_MASTER_DISABLE_STATUS,
 				   100);
+		msleep(100);
 	} else {
 		iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);