iwlwifi: pcie: fix 9000-series RF-kill interrupt propagation

A hardware issue on 9000 series devices sometimes causes RF-kill
interrupts to not be propagated to the host properly if ASPM is
enabled. Work around this by setting the right hardware bit to
allow it to interrupt the host for this reason (rfkill).
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-csr.h

@@ -312,7 +312,7 @@
 #define CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN           (0x00000001)
 
 #define CSR_GP_CNTRL_REG_MSK_POWER_SAVE_TYPE         (0x07000000)
-#define CSR_GP_CNTRL_REG_FLAG_MAC_POWER_SAVE         (0x04000000)
+#define CSR_GP_CNTRL_REG_FLAG_RFKILL_WAKE_L1A_EN     (0x04000000)
 #define CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW          (0x08000000)
 
 

drivers/net/wireless/intel/iwlwifi/pcie/internal.h

@@ -674,6 +674,16 @@ static inline void iwl_enable_rfkill_int(struct iwl_trans *trans)
 		iwl_enable_hw_int_msk_msix(trans,
 					   MSIX_HW_INT_CAUSES_REG_RF_KILL);
 	}
+
+	if (trans->cfg->device_family == IWL_DEVICE_FAMILY_9000) {
+		/*
+		 * On 9000-series devices this bit isn't enabled by default, so
+		 * when we power down the device we need set the bit to allow it
+		 * to wake up the PCI-E bus for RF-kill interrupts.
+		 */
+		iwl_set_bit(trans, CSR_GP_CNTRL,
+			    CSR_GP_CNTRL_REG_FLAG_RFKILL_WAKE_L1A_EN);
+	}
 }
 
 void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans);