ath9k: improve stuck beacon recovery and noise floor handling. significantly improves stability under strong interference in ap mode

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22460 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 101 insertions, 0 deletions

diff --git a/package/mac80211/patches/541-ath9k_nf_validate.patch b/package/mac80211/patches/541-ath9k_nf_validate.patch
new file mode 100644
index 000000000..7e3cb350f
--- /dev/null
+++ b/package/mac80211/patches/541-ath9k_nf_validate.patch
@@ -0,0 +1,101 @@
+--- a/drivers/net/wireless/ath/ath9k/calib.c
++++ b/drivers/net/wireless/ath/ath9k/calib.c
+@@ -19,8 +19,7 @@
+ 
+ /* Common calibration code */
+ 
+-/* We can tune this as we go by monitoring really low values */
+-#define ATH9K_NF_TOO_LOW	-60
++#define ATH9K_NF_TOO_HIGH	-60
+ 
+ static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
+ {
+@@ -45,11 +44,35 @@ static int16_t ath9k_hw_get_nf_hist_mid(
+ 	return nfval;
+ }
+ 
+-static void ath9k_hw_update_nfcal_hist_buffer(struct ath9k_nfcal_hist *h,
++static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah,
++						    struct ath9k_channel *chan)
++{
++	struct ath_nf_limits *limit;
++
++	if (!chan || IS_CHAN_2GHZ(chan))
++		limit = &ah->nf_2g;
++	else
++		limit = &ah->nf_5g;
++
++	return limit;
++}
++
++static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
++				   struct ath9k_channel *chan)
++{
++	return ath9k_hw_get_nf_limits(ah, chan)->nominal;
++}
++
++
++static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah,
++					      struct ath9k_nfcal_hist *h,
+ 					      int16_t *nfarray)
+ {
++	struct ath_nf_limits *limit;
+ 	int i;
+ 
++	limit = ath9k_hw_get_nf_limits(ah, ah->curchan);
++
+ 	for (i = 0; i < NUM_NF_READINGS; i++) {
+ 		h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
+ 
+@@ -63,6 +86,9 @@ static void ath9k_hw_update_nfcal_hist_b
+ 			h[i].privNF =
+ 				ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
+ 		}
++
++		if (h[i].privNF > limit->max)
++			h[i].privNF = limit->max;
+ 	}
+ }
+ 
+@@ -104,19 +130,6 @@ void ath9k_hw_reset_calibration(struct a
+ 	ah->cal_samples = 0;
+ }
+ 
+-static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
+-				   struct ath9k_channel *chan)
+-{
+-	struct ath_nf_limits *limit;
+-
+-	if (!chan || IS_CHAN_2GHZ(chan))
+-		limit = &ah->nf_2g;
+-	else
+-		limit = &ah->nf_5g;
+-
+-	return limit->nominal;
+-}
+-
+ /* This is done for the currently configured channel */
+ bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
+ {
+@@ -277,10 +290,10 @@ static void ath9k_hw_nf_sanitize(struct 
+ 			  "NF calibrated [%s] [chain %d] is %d\n",
+ 			  (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
+ 
+-		if (nf[i] > limit->max) {
++		if (nf[i] > ATH9K_NF_TOO_HIGH) {
+ 			ath_print(common, ATH_DBG_CALIBRATE,
+ 				  "NF[%d] (%d) > MAX (%d), correcting to MAX",
+-				  i, nf[i], limit->max);
++				  i, nf[i], ATH9K_NF_TOO_HIGH);
+ 			nf[i] = limit->max;
+ 		} else if (nf[i] < limit->min) {
+ 			ath_print(common, ATH_DBG_CALIBRATE,
+@@ -326,7 +339,7 @@ bool ath9k_hw_getnf(struct ath_hw *ah, s
+ 
+ 	h = caldata->nfCalHist;
+ 	caldata->nfcal_pending = false;
+-	ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
++	ath9k_hw_update_nfcal_hist_buffer(ah, h, nfarray);
+ 	caldata->rawNoiseFloor = h[0].privNF;
+ 	return true;
+ }