ath9k_hw: add some comments for ath9k_set_power_network_sleep()

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index f1405042a48d..ea831f575a9d 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2036,6 +2036,11 @@ static void ath9k_set_power_sleep(struct ath_hw *ah, int setChip)
         }
 }
 
+/*
+ * Notify Power Management is enabled in self-generating
+ * frames. If request, set power mode of chip to
+ * auto/normal.  Duration in units of 128us (1/8 TU).
+ */
 static void ath9k_set_power_network_sleep(struct ath_hw *ah, int setChip)
 {
         REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);
@@ -2043,9 +2048,14 @@ static void ath9k_set_power_network_sleep(struct ath_hw *ah, int setChip)
                 struct ath9k_hw_capabilities *pCap = &ah->caps;
 
                 if (!(pCap->hw_caps & ATH9K_HW_CAP_AUTOSLEEP)) {
+                        /* Set WakeOnInterrupt bit; clear ForceWake bit */
                         REG_WRITE(ah, AR_RTC_FORCE_WAKE,
                                   AR_RTC_FORCE_WAKE_ON_INT);
                 } else {
+                        /*
+                         * Clear the RTC force wake bit to allow the
+                         * mac to go to sleep.
+                         */
                         REG_CLR_BIT(ah, AR_RTC_FORCE_WAKE,
                                     AR_RTC_FORCE_WAKE_EN);
                 }