From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 9 Apr 2011 21:10:20 +0000 (+0200)
Subject: ath5k: fix SIFS time handling
X-Git-Tag: firefly_0821_release~7613^2~967^2~16^2~446
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=488a50176c169eb36544b4f970c8bba68ede30a1;p=firefly-linux-kernel-4.4.55.git

ath5k: fix SIFS time handling

ath5k uses 8 usec as a sifs time, extracted from the initvals, whereas the
standard requires a sifs time of 10. The difference originates from the fact
that the SIFS register has an offset of 2 usec.
Fix the SIFS time definition to use the standard value of 10 usec and subtract
2 usecs when writing the SIFS register.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h
index 996d8afafdb7..a49aeac378cd 100644
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -224,8 +224,7 @@
 
 /* SIFS */
 #define	AR5K_INIT_SIFS_TURBO			6
-/* XXX: 8 from initvals 10 from standard */
-#define	AR5K_INIT_SIFS_DEFAULT_BG		8
+#define	AR5K_INIT_SIFS_DEFAULT_BG		10
 #define	AR5K_INIT_SIFS_DEFAULT_A		16
 #define	AR5K_INIT_SIFS_HALF_RATE		32
 #define AR5K_INIT_SIFS_QUARTER_RATE		64
diff --git a/drivers/net/wireless/ath/ath5k/qcu.c b/drivers/net/wireless/ath/ath5k/qcu.c
index 93abcfacd990..b18c5021aac3 100644
--- a/drivers/net/wireless/ath/ath5k/qcu.c
+++ b/drivers/net/wireless/ath/ath5k/qcu.c
@@ -519,7 +519,7 @@ int ath5k_hw_set_ifs_intervals(struct ath5k_hw *ah, unsigned int slot_time)
 		return -EINVAL;
 
 	sifs = ath5k_hw_get_default_sifs(ah);
-	sifs_clock = ath5k_hw_htoclock(ah, sifs);
+	sifs_clock = ath5k_hw_htoclock(ah, sifs - 2);
 
 	/* EIFS
 	 * Txtime of ack at lowest rate + SIFS + DIFS