iwlwifi: pcie: clean RFKILL interrupt in AMPG

Newer firmware don't clean the RFKILL interrupt in APMG, do
it in driver instead.
If we forget to do so, we can't send HCMD to firmware while
the NIC is in RFKILL state.
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/iwl-prph.h

@@ -97,6 +97,8 @@
 
 #define APMG_PCIDEV_STT_VAL_L1_ACT_DIS		(0x00000800)
 
+#define APMG_RTC_INT_STT_RFKILL		(0x10000000)
+
 /* Device system time */
 #define DEVICE_SYSTEM_TIME_REG 0xA0206C
 

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

@@ -220,6 +220,9 @@ static int iwl_pcie_apm_init(struct iwl_trans *trans)
 	iwl_set_bits_prph(trans, APMG_PCIDEV_STT_REG,
 			  APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 
+	/* Clear the interrupt in APMG if the NIC is in RFKILL */
+	iwl_write_prph(trans, APMG_RTC_INT_STT_REG, APMG_RTC_INT_STT_RFKILL);
+
 	set_bit(STATUS_DEVICE_ENABLED, &trans_pcie->status);
 
 out: