From 9a658d2b5c222b62919ab47b11c907c731ac180a Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Mon, 21 Jun 2010 18:38:47 -0400 Subject: ath9k_hw: fix ASPM setting for AR9003 The AR_WA register should not be read when in sleep state so add a variable we can stash its value into for when we need to set it. Additionally the AR_WA_D3_TO_L1_DISABLE_REAL (bit 16) needs to be removed. Cc: Aeolus Yang Cc: Madhan Jaganathan signed-off-by: Luis R. Rodriguez Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/hw.c | 45 ++++++++++++++++++++++++++++++++----- 1 file changed, 39 insertions(+), 6 deletions(-) (limited to 'drivers/net/wireless/ath/ath9k/hw.c') diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 62597f4ca319..fb09042e2889 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -575,14 +575,8 @@ static int __ath9k_hw_init(struct ath_hw *ah) * This enables PCIe low power mode. */ if (AR_SREV_9300_20_OR_LATER(ah)) { - u32 regval; unsigned int i; - /* Set Bits 16 and 17 in the AR_WA register. */ - regval = REG_READ(ah, AR_WA); - regval |= 0x00030000; - REG_WRITE(ah, AR_WA, regval); - for (i = 0; i < ah->iniPcieSerdesLowPower.ia_rows; i++) { REG_WRITE(ah, INI_RA(&ah->iniPcieSerdesLowPower, i, 0), @@ -590,6 +584,15 @@ static int __ath9k_hw_init(struct ath_hw *ah) } } + /* + * Read back AR_WA into a permanent copy and set bits 14 and 17. + * We need to do this to avoid RMW of this register. We cannot + * read the reg when chip is asleep. + */ + ah->WARegVal = REG_READ(ah, AR_WA); + ah->WARegVal |= (AR_WA_D3_L1_DISABLE | + AR_WA_ASPM_TIMER_BASED_DISABLE); + if (ah->is_pciexpress) ath9k_hw_configpcipowersave(ah, 0, 0); else @@ -1009,6 +1012,11 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type) ENABLE_REGWRITE_BUFFER(ah); + if (AR_SREV_9300_20_OR_LATER(ah)) { + REG_WRITE(ah, AR_WA, ah->WARegVal); + udelay(10); + } + REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN | AR_RTC_FORCE_WAKE_ON_INT); @@ -1063,6 +1071,11 @@ static bool ath9k_hw_set_reset_power_on(struct ath_hw *ah) { ENABLE_REGWRITE_BUFFER(ah); + if (AR_SREV_9300_20_OR_LATER(ah)) { + REG_WRITE(ah, AR_WA, ah->WARegVal); + udelay(10); + } + REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN | AR_RTC_FORCE_WAKE_ON_INT); @@ -1099,6 +1112,11 @@ static bool ath9k_hw_set_reset_power_on(struct ath_hw *ah) static bool ath9k_hw_set_reset_reg(struct ath_hw *ah, u32 type) { + if (AR_SREV_9300_20_OR_LATER(ah)) { + REG_WRITE(ah, AR_WA, ah->WARegVal); + udelay(10); + } + REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN | AR_RTC_FORCE_WAKE_ON_INT); @@ -1768,6 +1786,11 @@ static void ath9k_set_power_sleep(struct ath_hw *ah, int setChip) REG_CLR_BIT(ah, (AR_RTC_RESET), AR_RTC_RESET_EN); } + + /* Clear Bit 14 of AR_WA after putting chip into Full Sleep mode. */ + if (AR_SREV_9300_20_OR_LATER(ah)) + REG_WRITE(ah, AR_WA, + ah->WARegVal & ~AR_WA_D3_L1_DISABLE); } /* @@ -1794,6 +1817,10 @@ static void ath9k_set_power_network_sleep(struct ath_hw *ah, int setChip) AR_RTC_FORCE_WAKE_EN); } } + + /* Clear Bit 14 of AR_WA after putting chip into Net Sleep mode. */ + if (AR_SREV_9300_20_OR_LATER(ah)) + REG_WRITE(ah, AR_WA, ah->WARegVal & ~AR_WA_D3_L1_DISABLE); } static bool ath9k_hw_set_power_awake(struct ath_hw *ah, int setChip) @@ -1801,6 +1828,12 @@ static bool ath9k_hw_set_power_awake(struct ath_hw *ah, int setChip) u32 val; int i; + /* Set Bits 14 and 17 of AR_WA before powering on the chip. */ + if (AR_SREV_9300_20_OR_LATER(ah)) { + REG_WRITE(ah, AR_WA, ah->WARegVal); + udelay(10); + } + if (setChip) { if ((REG_READ(ah, AR_RTC_STATUS) & AR_RTC_STATUS_M) == AR_RTC_STATUS_SHUTDOWN) { -- cgit v1.2.1