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authorBob Copeland <me@bobcopeland.com>2008-09-28 12:09:43 -0400
committerJohn W. Linville <linville@tuxdriver.com>2008-09-30 14:07:25 -0400
commit14be9947ef9843102b67d315c7483de112b5b2d7 (patch)
tree1a9637b0dafdcd63b07226ff9aa6ec6d840901ca /drivers
parentb0dee5784dff3e2984510a7fe7a7e48109001f94 (diff)
ath5k: write beacon control register twice when resetting tsf
According to the newly-released Atheros HAL code, asserting the TSF reset bit will toggle a hardware internal state, resulting in a spurious reset on the next chip reset. Whenever we force a TSF bit, write the bit twice to clear the internal signal. Signed-off-by: Bob Copeland <me@bobcopeland.com> Acked-by: Nick Kossifidis <mickflemm@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/ath5k/pcu.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath5k/pcu.c b/drivers/net/wireless/ath5k/pcu.c
index c77cee2a558..a47df9a24aa 100644
--- a/drivers/net/wireless/ath5k/pcu.c
+++ b/drivers/net/wireless/ath5k/pcu.c
@@ -633,8 +633,20 @@ u64 ath5k_hw_get_tsf64(struct ath5k_hw *ah)
*/
void ath5k_hw_reset_tsf(struct ath5k_hw *ah)
{
+ u32 val;
+
ATH5K_TRACE(ah->ah_sc);
- AR5K_REG_ENABLE_BITS(ah, AR5K_BEACON, AR5K_BEACON_RESET_TSF);
+
+ val = ath5k_hw_reg_read(ah, AR5K_BEACON) | AR5K_BEACON_RESET_TSF;
+
+ /*
+ * Each write to the RESET_TSF bit toggles a hardware internal
+ * signal to reset TSF, but if left high it will cause a TSF reset
+ * on the next chip reset as well. Thus we always write the value
+ * twice to clear the signal.
+ */
+ ath5k_hw_reg_write(ah, val, AR5K_BEACON);
+ ath5k_hw_reg_write(ah, val, AR5K_BEACON);
}
/*