2 files changed, 14 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index e33c53fb6b7e..1c02358b31f5 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);
 
diff --git a/drivers/net/wireless/ath9k/reg.h b/drivers/net/wireless/ath9k/reg.h
index a471832308a0..8d85106d6df2 100644
--- a/drivers/net/wireless/ath9k/reg.h
+++ b/drivers/net/wireless/ath9k/reg.h
@@ -977,8 +977,6 @@ enum {
 #define AR_RTC_PLL_CLKSEL       0x00000300
 #define AR_RTC_PLL_CLKSEL_S     8
 
-
-
 #define AR_RTC_RESET \
         ((AR_SREV_9100(ah)) ? (AR_RTC_BASE + 0x0040) : 0x7040)
 #define AR_RTC_RESET_EN         (0x00000001)
@@ -1015,6 +1013,12 @@ enum {
 #define AR_RTC_INTR_MASK \
         ((AR_SREV_9100(ah)) ? (AR_RTC_BASE + 0x0058) : 0x7058)
 
+/* RTC_DERIVED_* - only for AR9100 */
+
+#define AR_RTC_DERIVED_CLK           (AR_RTC_BASE + 0x0038)
+#define AR_RTC_DERIVED_CLK_PERIOD    0x0000fffe
+#define AR_RTC_DERIVED_CLK_PERIOD_S  1
+
 #define AR_SEQ_MASK     0x8060
 
 #define AR_AN_RF2G1_CH0         0x7810