ath9k: Restore TSF after RESET

For chips requiring RTC reset, TSF has to be restored
after power on reset.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 82a24408528b..af5bb50a2e8b 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2338,6 +2338,7 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
         struct ath9k_channel *curchan = ah->curchan;
         u32 saveDefAntenna;
         u32 macStaId1;
+        u64 tsf = 0;
         int i, rx_chainmask, r;
 
         ah->extprotspacing = sc->ht_extprotspacing;
@@ -2372,6 +2373,10 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 
         macStaId1 = REG_READ(ah, AR_STA_ID1) & AR_STA_ID1_BASE_RATE_11B;
 
+        /* For chips on which RTC reset is done, save TSF before it gets cleared */
+        if (AR_SREV_9280(ah) && ah->eep_ops->get_eeprom(ah, EEP_OL_PWRCTRL))
+                tsf = ath9k_hw_gettsf64(ah);
+
         saveLedState = REG_READ(ah, AR_CFG_LED) &
                 (AR_CFG_LED_ASSOC_CTL | AR_CFG_LED_MODE_SEL |
                  AR_CFG_LED_BLINK_THRESH_SEL | AR_CFG_LED_BLINK_SLOW);
@@ -2398,6 +2403,10 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
                 udelay(50);
         }
 
+        /* Restore TSF */
+        if (tsf && AR_SREV_9280(ah) && ah->eep_ops->get_eeprom(ah, EEP_OL_PWRCTRL))
+                ath9k_hw_settsf64(ah, tsf);
+
         if (AR_SREV_9280_10_OR_LATER(ah))
                 REG_SET_BIT(ah, AR_GPIO_INPUT_EN_VAL, AR_GPIO_JTAG_DISABLE);