Commit 2097fdd7 authored by Rajkumar Manoharan's avatar Rajkumar Manoharan Committed by John W. Linville
Browse files

ath9k_hw: Fix frequent BT rx recovery

While resuming from S3, BT host issues HCI reset command and it
causes BT firmware to busy with security key calculation. At this
movement, WLAN detects MCI hardware error of MCI_CONT_INFO_TIMEOUT
and then it starts the recovery sequence repeatedly. Too many
recovery sequences would exhaust the BT kernel message pool. This
patch imposes a duration between consecutive BT recovery procedure.
Thus it solves BT firmware panic issue reported in AR9565.
Signed-off-by: default avatarRajkumar Manoharan <>
Signed-off-by: default avatarJohn W. Linville <>
parent e9f9fd8c
......@@ -1203,7 +1203,7 @@ EXPORT_SYMBOL(ar9003_mci_cleanup);
u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type)
struct ath9k_hw_mci *mci = &ah->btcoex_hw.mci;
u32 value = 0;
u32 value = 0, tsf;
u8 query_type;
switch (state_type) {
......@@ -1261,6 +1261,14 @@ u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type)
ar9003_mci_send_coex_bt_status_query(ah, true, query_type);
tsf = ath9k_hw_gettsf32(ah);
if ((tsf - mci->last_recovery) <= MCI_RECOVERY_DUR_TSF) {
ath_dbg(ath9k_hw_common(ah), MCI,
"(MCI) ignore Rx recovery\n");
ath_dbg(ath9k_hw_common(ah), MCI, "(MCI) RECOVER RX\n");
mci->last_recovery = tsf;
mci->query_bt = true;
mci->need_flush_btinfo = true;
......@@ -18,6 +18,7 @@
#define AR9003_MCI_H
#define MCI_FLAG_DISABLE_TIMESTAMP 0x00000001 /* Disable time stamp */
#define MCI_RECOVERY_DUR_TSF (100 * 1000) /* 100 ms */
/* Default remote BT device MCI COEX version */
......@@ -88,6 +88,7 @@ struct ath9k_hw_mci {
u8 bt_state;
u8 stomp_ftp;
bool concur_tx;
u32 last_recovery;
struct ath_btcoex_hw {
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