ath9k: Program the RTC registers correctly

This patch programs the RTC registers of AR9100 chipsets
correctly during chip reset.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index e33c53fb6b7..1c02358b31f 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -1482,6 +1482,14 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type)
         u32 rst_flags;
         u32 tmpReg;
 
+        if (AR_SREV_9100(ah)) {
+                u32 val = REG_READ(ah, AR_RTC_DERIVED_CLK);
+                val &= ~AR_RTC_DERIVED_CLK_PERIOD;
+                val |= SM(1, AR_RTC_DERIVED_CLK_PERIOD);
+                REG_WRITE(ah, AR_RTC_DERIVED_CLK, val);
+                (void)REG_READ(ah, AR_RTC_DERIVED_CLK);
+        }
+
         REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN |
                   AR_RTC_FORCE_WAKE_ON_INT);