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-rw-r--r--package/mac80211/patches/510-ar9100_tsf_preserve.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/package/mac80211/patches/510-ar9100_tsf_preserve.patch b/package/mac80211/patches/510-ar9100_tsf_preserve.patch
new file mode 100644
index 0000000000..3af78dabbd
--- /dev/null
+++ b/package/mac80211/patches/510-ar9100_tsf_preserve.patch
@@ -0,0 +1,39 @@
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -1280,7 +1280,8 @@ int ath9k_hw_reset(struct ath_hw *ah, st
+ macStaId1 = REG_READ(ah, AR_STA_ID1) & AR_STA_ID1_BASE_RATE_11B;
+
+ /* For chips on which RTC reset is done, save TSF before it gets cleared */
+- if (AR_SREV_9280(ah) && ah->eep_ops->get_eeprom(ah, EEP_OL_PWRCTRL))
++ if (AR_SREV_9100(ah) ||
++ (AR_SREV_9280(ah) && ah->eep_ops->get_eeprom(ah, EEP_OL_PWRCTRL)))
+ tsf = ath9k_hw_gettsf64(ah);
+
+ saveLedState = REG_READ(ah, AR_CFG_LED) &
+@@ -1312,7 +1313,7 @@ int ath9k_hw_reset(struct ath_hw *ah, st
+ }
+
+ /* Restore TSF */
+- if (tsf && AR_SREV_9280(ah) && ah->eep_ops->get_eeprom(ah, EEP_OL_PWRCTRL))
++ if (tsf)
+ ath9k_hw_settsf64(ah, tsf);
+
+ if (AR_SREV_9280_10_OR_LATER(ah))
+@@ -1325,6 +1326,17 @@ int ath9k_hw_reset(struct ath_hw *ah, st
+ if (r)
+ return r;
+
++ /*
++ * Some AR91xx SoC devices frequently fail to accept TSF writes
++ * right after the chip reset. When that happens, write a new
++ * value after the initvals have been applied, with an offset
++ * based on measured time differences
++ */
++ if (AR_SREV_9100(ah) && (ath9k_hw_gettsf64(ah) < tsf)) {
++ tsf += 1500;
++ ath9k_hw_settsf64(ah, tsf);
++ }
++
+ /* Setup MFP options for CCMP */
+ if (AR_SREV_9280_20_OR_LATER(ah)) {
+ /* Mask Retry(b11), PwrMgt(b12), MoreData(b13) to 0 in mgmt