ath9k: Fix PHY restart workaround

The PHY restart workaround that handles baseband hangs
for packets with unsupported rates is required only
for a HW bug in AR9300 v2.2. All the subsequent chips in
the AR9003 family do not require this driver fix since
it has been addressed in the HW.

Since the value of the AR_PHY_RESTART register is written
with the default initvals, make sure that PHY restart is
always disabled once this particular BB hang signaure has
been encountered.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
index 9f051a08e1431e4696d52536197752fd4d305918..b0203318e50c6a304cc8326701b8ceeefe6b90f6 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -1930,6 +1930,7 @@ EXPORT_SYMBOL(ar9003_hw_bb_watchdog_dbg_info);
 
 void ar9003_hw_disable_phy_restart(struct ath_hw *ah)
 {
+       u8 result;
        u32 val;
 
        /* While receiving unsupported rate frame rx state machine
@@ -1937,15 +1938,13 @@ void ar9003_hw_disable_phy_restart(struct ath_hw *ah)
         * state, BB would go hang. If RXSM is in 0xb state after
         * first bb panic, ensure to disable the phy_restart.
         */
-       if (!((MS(ah->bb_watchdog_last_status,
-                 AR_PHY_WATCHDOG_RX_OFDM_SM) == 0xb) ||
-           ah->bb_hang_rx_ofdm))
-               return;
-
-       ah->bb_hang_rx_ofdm = true;
-       val = REG_READ(ah, AR_PHY_RESTART);
-       val &= ~AR_PHY_RESTART_ENA;
+       result = MS(ah->bb_watchdog_last_status, AR_PHY_WATCHDOG_RX_OFDM_SM);
 
-       REG_WRITE(ah, AR_PHY_RESTART, val);
+       if ((result == 0xb) || ah->bb_hang_rx_ofdm) {
+               ah->bb_hang_rx_ofdm = true;
+               val = REG_READ(ah, AR_PHY_RESTART);
+               val &= ~AR_PHY_RESTART_ENA;
+               REG_WRITE(ah, AR_PHY_RESTART, val);
+       }
 }
 EXPORT_SYMBOL(ar9003_hw_disable_phy_restart);

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 708388063a6bfb8ee06b0011f087f35099605d63..78ca41c0cf94bf834cfb25e4704b5b2b643218d8 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1935,10 +1935,11 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
        ath9k_hw_loadnf(ah, chan);
        ath9k_hw_start_nfcal(ah, true);
 
-       if (AR_SREV_9300_20_OR_LATER(ah)) {
+       if (AR_SREV_9300_20_OR_LATER(ah))
                ar9003_hw_bb_watchdog_config(ah);
+
+       if (ah->config.hw_hang_checks & HW_PHYRESTART_CLC_WAR)
                ar9003_hw_disable_phy_restart(ah);
-       }
 
        ath9k_hw_apply_gpio_override(ah);