iwlwifi: pcie: clear RFKILL interrupt in AMPG

If we forget to do so, we can't send HCMD to firmware while
the NIC is in RFKILL state.

Cc: stable@vger.kernel.org
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-prph.h b/drivers/net/wireless/iwlwifi/iwl-prph.h
index ff8cc75c189d..a70c7b9d9bad 100644
--- a/drivers/net/wireless/iwlwifi/iwl-prph.h
+++ b/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
 
diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index fd848cd1583e..f600e68a410a 100644
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -888,6 +888,14 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
 
                 iwl_op_mode_hw_rf_kill(trans->op_mode, hw_rfkill);
                 if (hw_rfkill) {
+                        /*
+                         * Clear the interrupt in APMG if the NIC is going down.
+                         * Note that when the NIC exits RFkill (else branch), we
+                         * can't access prph and the NIC will be reset in
+                         * start_hw anyway.
+                         */
+                        iwl_write_prph(trans, APMG_RTC_INT_STT_REG,
+                                       APMG_RTC_INT_STT_RFKILL);
                         set_bit(STATUS_RFKILL, &trans_pcie->status);
                         if (test_and_clear_bit(STATUS_HCMD_ACTIVE,
                                                &trans_pcie->status))