[ath9k-devel] [PATCH] ath9k: Fix enabling OFDM weak signal detection

[Luis R. Rodriguez <lrodriguez@atheros.com>]

On Fri, Jul 10, 2009 at 11:02:58AM -0700, Luis R. Rodriguez wrote:
> On Thu, Jul 9, 2009 at 2:12 PM, Steven Luo<steven@steven676.net> wrote:
> > From: Steven Luo <steven@steven676.net>
> >
> > It seems that OFDM weak signal detection should be enabled after an ANI
> > state reset, as indicated by the initial setting of ofdmWeakSigDetectOff
> > and what the open Atheros HAL does.  Unfortunately, the reversed sense
> > of ofdmWeakSigDetectOff (true if weak signal detection is NOT enabled)
> > seems to have resulted in a mixup here, causing weak signal detection to
> > be disabled.
> >
> > This patch significantly improves reception and throughput from distant
> > stations for my AR5416-based AP running compat-wireless 2009-06-25.
> >
> > Signed-off-by: Steven Luo <steven@steven676.net>
> > Cc: stable at kernel.org
> > ---
> 
> NACK for now, please give us a chance to review this -- this may
> actually be correct.

Please try this patch instead, I've only compile tested this.

From: Luis R. Rodriguez <lrodriguez@atheros.com>
Subject: [PATCH] ath9k: Tune ANI function processing on AP mode during ANI reset

For AP mode we must tune ANI specially for 2 GHz and
for 5 GHz. We mask in only the flags we want to toggle
on ath9k_hw_ani_control() through the ah->ani_function
bitmask, this will take care of ignoring changes during
ANI reset which we were disabling before.

Reported-by: Steven Luo <steven@steven676.net>
Cc: Bennyam Malavazi <Bennyam.Malavazi at Atheros.com
Cc: Jouni Malinen <Jouni.Malinen@Atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
---
 drivers/net/wireless/ath/ath9k/ani.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c
--- a/drivers/net/wireless/ath/ath9k/ani.c
+++ b/drivers/net/wireless/ath/ath9k/ani.c
@@ -478,6 +478,19 @@ void ath9k_ani_reset(struct ath_hw *ah)
 			"Reset ANI state opmode %u\n", ah->opmode);
 		ah->stats.ast_ani_reset++;
 
+		if (ah->opmode == NL80211_IFTYPE_AP ||
+		    ah->opmode == NL80211_IFTYPE_AP) {
+			/*
+			 * ath9k_hw_ani_control() will only process items set on
+			 * ah->ani_function
+			 */
+			if (IS_CHAN_2GHZ(chan))
+				ah->ani_function = (ATH9K_ANI_SPUR_IMMUNITY_LEVEL |
+						    ATH9K_ANI_FIRSTEP_LEVEL);
+			else
+				ah->ani_function = 0;
+		}
+
 		ath9k_hw_ani_control(ah, ATH9K_ANI_NOISE_IMMUNITY_LEVEL, 0);
 		ath9k_hw_ani_control(ah, ATH9K_ANI_SPUR_IMMUNITY_LEVEL, 0);
 		ath9k_hw_ani_control(ah, ATH9K_ANI_FIRSTEP_LEVEL, 0);
-- 
1.6.3.3