The HW statemachine is sometimes found stuck in the state
WL_LNA_CTRL_DISABLE when BT is in sleep, which will cause
TX_HOLD always asserted and resmgr stuck in PENDING_TX state
Signed-off-by: Rajkumar Manoharan <rmanohar@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/hw.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 45e6700..db3dfc9 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2086,8 +2086,9 @@ static void ath9k_set_power_network_sleep(struct ath_hw *ah)
static bool ath9k_hw_set_power_awake(struct ath_hw *ah)
{
- u32 val;
+ u32 val, btcoex_ctrl2, diag_sw;
int i;
+ u8 lna_ctrl, bt_sleep;
/* Set Bits 14 and 17 of AR_WA before powering on the chip. */
if (AR_SREV_9300_20_OR_LATER(ah)) {
@@ -2111,6 +2112,37 @@ static bool ath9k_hw_set_power_awake(struct ath_hw *ah)
AR_RTC_FORCE_WAKE_EN);
udelay(50);
+ if (!AR_SREV_9462_20(ah))
+ goto skip_btcoex;
+
+ for (i = 0; i < AH_WAIT_TIMEOUT; i++) {
+ btcoex_ctrl2 = REG_READ(ah, AR_BTCOEX_CTRL2);
+ if (btcoex_ctrl2 != 0xdeadbeef)
+ break;
+ udelay(AH_TIME_QUANTUM);
+ }
+ REG_WRITE(ah, AR_BTCOEX_CTRL2, (btcoex_ctrl2 | BIT(23)));
+
+ for (i = 0; i < AH_WAIT_TIMEOUT; i++) {
+ diag_sw = REG_READ(ah, AR_DIAG_SW);
+ if (diag_sw != 0xdeadbeef)
+ break;
+ udelay(AH_TIME_QUANTUM);
+ }
+ REG_WRITE(ah, AR_DIAG_SW, (diag_sw | BIT(27) | BIT(19) | BIT(18)));
+ lna_ctrl = REG_READ(ah, AR_OBS_BUS_CTRL) & 0x3;
+ bt_sleep = REG_READ(ah, AR_MCI_RX_STATUS) & AR_MCI_RX_REMOTE_SLEEP;
+
+ REG_WRITE(ah, AR_BTCOEX_CTRL2, btcoex_ctrl2);
+ REG_WRITE(ah, AR_DIAG_SW, diag_sw);
+
+ if (bt_sleep && (lna_ctrl == 2)) {
+ REG_SET_BIT(ah, AR_BTCOEX_RC, 0x1);
+ REG_CLR_BIT(ah, AR_BTCOEX_RC, 0x1);
+ udelay(50);
+ }
+
+skip_btcoex:
for (i = POWER_UP_TIME / 50; i > 0; i--) {
val = REG_READ(ah, AR_RTC_STATUS) & AR_RTC_STATUS_M;
if (val == AR_RTC_STATUS_ON)
--
1.7.10.3
--
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