ath9k: Reduce the frequency of PA offset calibration

PA calibration need not be done if the offset is not varying.
The current logic does PA calibration even if the offset is the
same.

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

diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
index 20f74b5b5703f178cfae2db3f6f554c2848870ef..47a024da29c9ad6c0a3430f35691956aa42831e9 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -861,7 +861,7 @@ static void ath9k_hw_9271_pa_cal(struct ath_hw *ah)
                REG_WRITE(ah, regList[i][0], regList[i][1]);
 }
 
-static inline void ath9k_hw_9285_pa_cal(struct ath_hw *ah)
+static inline void ath9k_hw_9285_pa_cal(struct ath_hw *ah, bool is_reset)
 {
 
        u32 regVal;
@@ -877,6 +877,8 @@ static inline void ath9k_hw_9285_pa_cal(struct ath_hw *ah)
                { 0x7838, 0 },
        };
 
+       DPRINTF(ah->ah_sc, ATH_DBG_CALIBRATE, "Running PA Calibration\n");
+
        if (AR_SREV_9285_11(ah)) {
                REG_WRITE(ah, AR9285_AN_TOP4, (AR9285_AN_TOP4_DEFAULT | 0x14));
                udelay(10);
@@ -936,6 +938,17 @@ static inline void ath9k_hw_9285_pa_cal(struct ath_hw *ah)
        offs_6_1 = offset>>1;
        offs_0 = offset & 1;
 
+       if ((!is_reset) && (ah->pacal_info.prev_offset == offset)) {
+               if (ah->pacal_info.max_skipcount < MAX_PACAL_SKIPCOUNT)
+                       ah->pacal_info.max_skipcount =
+                               2 * ah->pacal_info.max_skipcount;
+               ah->pacal_info.skipcount = ah->pacal_info.max_skipcount;
+       } else {
+               ah->pacal_info.max_skipcount = 1;
+               ah->pacal_info.skipcount = 0;
+               ah->pacal_info.prev_offset = offset;
+       }
+
        REG_RMW_FIELD(ah, AR9285_AN_RF2G6, AR9285_AN_RF2G6_OFFS, offs_6_1);
        REG_RMW_FIELD(ah, AR9285_AN_RF2G3, AR9285_AN_RF2G3_PDVCCOMP, offs_0);
 
@@ -982,8 +995,12 @@ bool ath9k_hw_calibrate(struct ath_hw *ah, struct ath9k_channel *chan,
                /* Do periodic PAOffset Cal */
                if (AR_SREV_9271(ah))
                        ath9k_hw_9271_pa_cal(ah);
-               else if (AR_SREV_9285_11_OR_LATER(ah))
-                       ath9k_hw_9285_pa_cal(ah);
+               else if (AR_SREV_9285_11_OR_LATER(ah)) {
+                       if (!ah->pacal_info.skipcount)
+                               ath9k_hw_9285_pa_cal(ah, false);
+                       else
+                               ah->pacal_info.skipcount--;
+               }
 
                if (OLC_FOR_AR9280_20_LATER || OLC_FOR_AR9287_10_LATER)
                        ath9k_olc_temp_compensation(ah);
@@ -1081,7 +1098,7 @@ bool ath9k_hw_init_cal(struct ath_hw *ah, struct ath9k_channel *chan)
 
        /* Do PA Calibration */
        if (AR_SREV_9285_11_OR_LATER(ah))
-               ath9k_hw_9285_pa_cal(ah);
+               ath9k_hw_9285_pa_cal(ah, true);
 
        /* Do NF Calibration after DC offset and other calibrations */
        REG_WRITE(ah, AR_PHY_AGC_CONTROL,

diff --git a/drivers/net/wireless/ath/ath9k/calib.h b/drivers/net/wireless/ath/ath9k/calib.h
index 547e697b905510f4ccbf9d79ca8c7be86e41a043..019bcbba40ed8b43a67aae4aef470f3797213656 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/calib.h
+++ b/drivers/net/wireless/ath/ath9k/calib.h
@@ -110,6 +110,13 @@ struct ath9k_nfcal_hist {
        u8 invalidNFcount;
 };
 
+#define MAX_PACAL_SKIPCOUNT 8
+struct ath9k_pacal_info{
+       int32_t prev_offset;    /* Previous value of PA offset value */
+       int8_t max_skipcount;   /* Max No. of times PACAL can be skipped */
+       int8_t skipcount;       /* No. of times the PACAL to be skipped */
+};
+
 bool ath9k_hw_reset_calvalid(struct ath_hw *ah);
 void ath9k_hw_start_nfcal(struct ath_hw *ah);
 void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan);

diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 24b30631d93ee49f25a7c73e64e99a74d78d0bd5..b24150a1b4add4a78bd6fea1f0cd6e5be69b5ff1 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -424,6 +424,7 @@ struct ath_hw {
        enum ath9k_power_mode power_mode;
 
        struct ath9k_nfcal_hist nfCalHist[NUM_NF_READINGS];
+       struct ath9k_pacal_info pacal_info;
        struct ar5416Stats stats;
        struct ath9k_tx_queue_info txq[ATH9K_NUM_TX_QUEUES];