From a7abaf7da975ecac58e22bae75605b2a1d8e7ff0 Mon Sep 17 00:00:00 2001 From: Sujith Manoharan Date: Tue, 24 Dec 2013 10:44:21 +0530 Subject: [PATCH] ath9k: Fix PHY restart workaround The PHY restart workaround that handles baseband hangs for packets with unsupported rates is required only for a HW bug in AR9300 v2.2. All the subsequent chips in the AR9003 family do not require this driver fix since it has been addressed in the HW. Since the value of the AR_PHY_RESTART register is written with the default initvals, make sure that PHY restart is always disabled once this particular BB hang signaure has been encountered. Signed-off-by: Sujith Manoharan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ar9003_phy.c | 17 ++++++++--------- drivers/net/wireless/ath/ath9k/hw.c | 5 +++-- 2 files changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c index 9f051a08e143..b0203318e50c 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c @@ -1930,6 +1930,7 @@ EXPORT_SYMBOL(ar9003_hw_bb_watchdog_dbg_info); void ar9003_hw_disable_phy_restart(struct ath_hw *ah) { + u8 result; u32 val; /* While receiving unsupported rate frame rx state machine @@ -1937,15 +1938,13 @@ void ar9003_hw_disable_phy_restart(struct ath_hw *ah) * state, BB would go hang. If RXSM is in 0xb state after * first bb panic, ensure to disable the phy_restart. */ - if (!((MS(ah->bb_watchdog_last_status, - AR_PHY_WATCHDOG_RX_OFDM_SM) == 0xb) || - ah->bb_hang_rx_ofdm)) - return; - - ah->bb_hang_rx_ofdm = true; - val = REG_READ(ah, AR_PHY_RESTART); - val &= ~AR_PHY_RESTART_ENA; + result = MS(ah->bb_watchdog_last_status, AR_PHY_WATCHDOG_RX_OFDM_SM); - REG_WRITE(ah, AR_PHY_RESTART, val); + if ((result == 0xb) || ah->bb_hang_rx_ofdm) { + ah->bb_hang_rx_ofdm = true; + val = REG_READ(ah, AR_PHY_RESTART); + val &= ~AR_PHY_RESTART_ENA; + REG_WRITE(ah, AR_PHY_RESTART, val); + } } EXPORT_SYMBOL(ar9003_hw_disable_phy_restart); diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 708388063a6b..78ca41c0cf94 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1935,10 +1935,11 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan, ath9k_hw_loadnf(ah, chan); ath9k_hw_start_nfcal(ah, true); - if (AR_SREV_9300_20_OR_LATER(ah)) { + if (AR_SREV_9300_20_OR_LATER(ah)) ar9003_hw_bb_watchdog_config(ah); + + if (ah->config.hw_hang_checks & HW_PHYRESTART_CLC_WAR) ar9003_hw_disable_phy_restart(ah); - } ath9k_hw_apply_gpio_override(ah); -- 2.39.5