From bb6313140b3c8356cf36675a8edbf6782dc6c3d0 Mon Sep 17 00:00:00 2001 From: Sujith Manoharan Date: Mon, 2 Feb 2015 18:21:10 +0530 Subject: [PATCH] ath9k: Fix issues with WoW enable This patch addresses several issues with the ath9k_hw_wow_enable() routine: * The usage of set/clr variables is removed. Writing the required values to registers is cleaner. * The shift value of 28 for the contention window field in AR_WOW_PATTERN is incorrect, change it to 27. * Disabling Keep Alive needs to be done based on the LINK_CHANGE option. This is done unconditionally now, fix this. * The workaround for the D1/D3 issue is required only for AR9462. * The bitfield for enabling pattern matching for packets less than 256 bytes has expanded for new chips, handle this accordingly. * General cleanup. Signed-off-by: Sujith Manoharan Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath9k/ar9003_wow.c | 181 ++++++++++++++-------------- drivers/net/wireless/ath/ath9k/hw.h | 2 +- drivers/net/wireless/ath/ath9k/reg_wow.h | 5 +- 3 files changed, 93 insertions(+), 95 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9003_wow.c b/drivers/net/wireless/ath/ath9k/ar9003_wow.c index 4b53d0b..6ffa0e0 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_wow.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_wow.c @@ -222,14 +222,9 @@ EXPORT_SYMBOL(ath9k_hw_wow_wakeup); void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable) { u32 wow_event_mask; + u32 keep_alive, magic_pattern, host_pm_ctrl; u32 set, clr; - /* - * wow_event_mask is a mask to the AR_WOW_PATTERN register to - * indicate which WoW events we have enabled. The WoW events - * are from the 'pattern_enable' in this function and - * 'pattern_count' of ath9k_hw_wow_apply_pattern() - */ wow_event_mask = ah->wow.wow_event_mask; /* @@ -249,152 +244,154 @@ void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable) } /* - * set the power states appropriately and enable PME + * AR_PMCTRL_HOST_PME_EN - Override PME enable in configuration + * space and allow MAC to generate WoW anyway. + * + * AR_PMCTRL_PWR_PM_CTRL_ENA - ??? + * + * AR_PMCTRL_AUX_PWR_DET - PCI core SYS_AUX_PWR_DET signal, + * needs to be set for WoW in PCI mode. + * + * AR_PMCTRL_WOW_PME_CLR - WoW Clear Signal going to the MAC. + * + * Set the power states appropriately and enable PME. + * + * Set and clear WOW_PME_CLEAR for the chip + * to generate next wow signal. */ - set = AR_PMCTRL_HOST_PME_EN | AR_PMCTRL_PWR_PM_CTRL_ENA | - AR_PMCTRL_AUX_PWR_DET | AR_PMCTRL_WOW_PME_CLR; + REG_SET_BIT(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_HOST_PME_EN | + AR_PMCTRL_PWR_PM_CTRL_ENA | + AR_PMCTRL_AUX_PWR_DET | + AR_PMCTRL_WOW_PME_CLR); + REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_WOW_PME_CLR); /* - * set and clear WOW_PME_CLEAR registers for the chip - * to generate next wow signal. + * Random Backoff. + * + * 31:28 in AR_WOW_PATTERN : Indicates the number of bits used in the + * contention window. For value N, + * the random backoff will be selected between + * 0 and (2 ^ N) - 1. */ - REG_SET_BIT(ah, AR_PCIE_PM_CTRL, set); - clr = AR_PMCTRL_WOW_PME_CLR; - REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, clr); + REG_SET_BIT(ah, AR_WOW_PATTERN, + AR_WOW_BACK_OFF_SHIFT(AR_WOW_PAT_BACKOFF)); /* - * Setup for: - * - beacon misses - * - magic pattern - * - keep alive timeout - * - pattern matching + * AIFS time, Slot time, Keep Alive count. */ - + REG_SET_BIT(ah, AR_WOW_COUNT, AR_WOW_AIFS_CNT(AR_WOW_CNT_AIFS_CNT) | + AR_WOW_SLOT_CNT(AR_WOW_CNT_SLOT_CNT) | + AR_WOW_KEEP_ALIVE_CNT(AR_WOW_CNT_KA_CNT)); /* - * Program default values for pattern backoff, aifs/slot/KAL count, - * beacon miss timeout, KAL timeout, etc. + * Beacon timeout. */ - set = AR_WOW_BACK_OFF_SHIFT(AR_WOW_PAT_BACKOFF); - REG_SET_BIT(ah, AR_WOW_PATTERN, set); - - set = AR_WOW_AIFS_CNT(AR_WOW_CNT_AIFS_CNT) | - AR_WOW_SLOT_CNT(AR_WOW_CNT_SLOT_CNT) | - AR_WOW_KEEP_ALIVE_CNT(AR_WOW_CNT_KA_CNT); - REG_SET_BIT(ah, AR_WOW_COUNT, set); - if (pattern_enable & AH_WOW_BEACON_MISS) - set = AR_WOW_BEACON_TIMO; - /* We are not using beacon miss, program a large value */ + REG_WRITE(ah, AR_WOW_BCN_TIMO, AR_WOW_BEACON_TIMO); else - set = AR_WOW_BEACON_TIMO_MAX; - - REG_WRITE(ah, AR_WOW_BCN_TIMO, set); + REG_WRITE(ah, AR_WOW_BCN_TIMO, AR_WOW_BEACON_TIMO_MAX); /* - * Keep alive timo in ms except AR9280 + * Keep alive timeout in ms. */ if (!pattern_enable) - set = AR_WOW_KEEP_ALIVE_NEVER; + REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, AR_WOW_KEEP_ALIVE_NEVER); else - set = KAL_TIMEOUT * 32; - - REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, set); + REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, KAL_TIMEOUT * 32); /* - * Keep alive delay in us. based on 'power on clock', - * therefore in usec + * Keep alive delay in us. */ - set = KAL_DELAY * 1000; - REG_WRITE(ah, AR_WOW_KEEP_ALIVE_DELAY, set); + REG_WRITE(ah, AR_WOW_KEEP_ALIVE_DELAY, KAL_DELAY * 1000); /* - * Create keep alive pattern to respond to beacons + * Create keep alive pattern to respond to beacons. */ ath9k_wow_create_keep_alive_pattern(ah); /* - * Configure MAC WoW Registers + * Configure keep alive register. */ - set = 0; + keep_alive = REG_READ(ah, AR_WOW_KEEP_ALIVE); + /* Send keep alive timeouts anyway */ - clr = AR_WOW_KEEP_ALIVE_AUTO_DIS; + keep_alive &= ~AR_WOW_KEEP_ALIVE_AUTO_DIS; - if (pattern_enable & AH_WOW_LINK_CHANGE) + if (pattern_enable & AH_WOW_LINK_CHANGE) { + keep_alive &= ~AR_WOW_KEEP_ALIVE_FAIL_DIS; wow_event_mask |= AR_WOW_KEEP_ALIVE_FAIL; - else - set = AR_WOW_KEEP_ALIVE_FAIL_DIS; + } else { + keep_alive |= AR_WOW_KEEP_ALIVE_FAIL_DIS; + } - set = AR_WOW_KEEP_ALIVE_FAIL_DIS; - REG_RMW(ah, AR_WOW_KEEP_ALIVE, set, clr); + REG_WRITE(ah, AR_WOW_KEEP_ALIVE, keep_alive); /* - * we are relying on a bmiss failure. ensure we have - * enough threshold to prevent false positives + * We are relying on a bmiss failure, ensure we have + * enough threshold to prevent false positives. */ REG_RMW_FIELD(ah, AR_RSSI_THR, AR_RSSI_THR_BM_THR, AR_WOW_BMISSTHRESHOLD); - set = 0; - clr = 0; - if (pattern_enable & AH_WOW_BEACON_MISS) { - set = AR_WOW_BEACON_FAIL_EN; wow_event_mask |= AR_WOW_BEACON_FAIL; + REG_SET_BIT(ah, AR_WOW_BCN_EN, AR_WOW_BEACON_FAIL_EN); } else { - clr = AR_WOW_BEACON_FAIL_EN; + REG_CLR_BIT(ah, AR_WOW_BCN_EN, AR_WOW_BEACON_FAIL_EN); } - REG_RMW(ah, AR_WOW_BCN_EN, set, clr); - - set = 0; - clr = 0; /* - * Enable the magic packet registers + * Enable the magic packet registers. */ + magic_pattern = REG_READ(ah, AR_WOW_PATTERN); + magic_pattern |= AR_WOW_MAC_INTR_EN; + if (pattern_enable & AH_WOW_MAGIC_PATTERN_EN) { - set = AR_WOW_MAGIC_EN; + magic_pattern |= AR_WOW_MAGIC_EN; wow_event_mask |= AR_WOW_MAGIC_PAT_FOUND; } else { - clr = AR_WOW_MAGIC_EN; + magic_pattern &= ~AR_WOW_MAGIC_EN; } - set |= AR_WOW_MAC_INTR_EN; - REG_RMW(ah, AR_WOW_PATTERN, set, clr); + REG_WRITE(ah, AR_WOW_PATTERN, magic_pattern); + + /* + * Enable pattern matching for packets which are less + * than 256 bytes. + */ REG_WRITE(ah, AR_WOW_PATTERN_MATCH_LT_256B, AR_WOW_PATTERN_SUPPORTED); /* - * Set the power states appropriately and enable PME + * Set the power states appropriately and enable PME. */ - clr = 0; - set = AR_PMCTRL_PWR_STATE_D1D3 | AR_PMCTRL_HOST_PME_EN | - AR_PMCTRL_PWR_PM_CTRL_ENA; + host_pm_ctrl = REG_READ(ah, AR_PCIE_PM_CTRL); + host_pm_ctrl |= AR_PMCTRL_PWR_STATE_D1D3 | + AR_PMCTRL_HOST_PME_EN | + AR_PMCTRL_PWR_PM_CTRL_ENA; + host_pm_ctrl &= ~AR_PCIE_PM_CTRL_ENA; - clr = AR_PCIE_PM_CTRL_ENA; - REG_RMW(ah, AR_PCIE_PM_CTRL, set, clr); + if (AR_SREV_9462(ah)) { + /* + * This is needed to prevent the chip waking up + * the host within 3-4 seconds with certain + * platform/BIOS. + */ + host_pm_ctrl &= ~AR_PMCTRL_PWR_STATE_D1D3; + host_pm_ctrl |= AR_PMCTRL_PWR_STATE_D1D3_REAL; + } + + REG_WRITE(ah, AR_PCIE_PM_CTRL, host_pm_ctrl); /* - * this is needed to prevent the chip waking up - * the host within 3-4 seconds with certain - * platform/BIOS. The fix is to enable - * D1 & D3 to match original definition and - * also match the OTP value. Anyway this - * is more related to SW WOW. + * Enable sequence number generation when asleep. */ - clr = AR_PMCTRL_PWR_STATE_D1D3; - REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, clr); - - set = AR_PMCTRL_PWR_STATE_D1D3_REAL; - REG_SET_BIT(ah, AR_PCIE_PM_CTRL, set); - REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PRESERVE_SEQNUM); - /* to bring down WOW power low margin */ - set = BIT(13); - REG_SET_BIT(ah, AR_PCIE_PHY_REG3, set); + /* To bring down WOW power low margin */ + REG_SET_BIT(ah, AR_PCIE_PHY_REG3, BIT(13)); + /* HW WoW */ - clr = BIT(5); - REG_CLR_BIT(ah, AR_PCU_MISC_MODE3, clr); + REG_CLR_BIT(ah, AR_PCU_MISC_MODE3, BIT(5)); ath9k_hw_set_powermode_wow_sleep(ah); ah->wow.wow_event_mask = wow_event_mask; diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h index c8b3d8f..e82e570 100644 --- a/drivers/net/wireless/ath/ath9k/hw.h +++ b/drivers/net/wireless/ath/ath9k/hw.h @@ -199,7 +199,7 @@ #define KAL_NUM_DESC_WORDS 12 #define KAL_ANTENNA_MODE 1 #define KAL_TO_DS 1 -#define KAL_DELAY 4 /*delay of 4ms between 2 KAL frames */ +#define KAL_DELAY 4 /* delay of 4ms between 2 KAL frames */ #define KAL_TIMEOUT 900 #define MAX_PATTERN_SIZE 256 diff --git a/drivers/net/wireless/ath/ath9k/reg_wow.h b/drivers/net/wireless/ath/ath9k/reg_wow.h index 83f27f9..3abfca5 100644 --- a/drivers/net/wireless/ath/ath9k/reg_wow.h +++ b/drivers/net/wireless/ath/ath9k/reg_wow.h @@ -68,7 +68,7 @@ #define AR_CLR_MAC_INTERRUPT 0x20 #define AR_CLR_KA_INTERRUPT 0x40 -#define AR_WOW_BACK_OFF_SHIFT(x) ((x & 0xf) << 28) /* in usecs */ +#define AR_WOW_BACK_OFF_SHIFT(x) ((x & 0xf) << 27) /* in usecs */ #define AR_WOW_MAC_INTR_EN 0x00040000 #define AR_WOW_MAGIC_EN 0x00010000 #define AR_WOW_PATTERN_EN(x) (x & 0xff) @@ -113,7 +113,8 @@ #define AR_WOW_KA_DESC_WORD2 0xe000 #define AR_WOW_TB_PATTERN(i) (0xe100 + (i << 8)) #define AR_WOW_TB_MASK(i) (0xec00 + (i << 5)) -#define AR_WOW_PATTERN_SUPPORTED 0xff +#define AR_WOW_PATTERN_SUPPORTED_LEGACY 0xff +#define AR_WOW_PATTERN_SUPPORTED 0xffff #define AR_WOW_LENGTH_MAX 0xff #define AR_WOW_LEN1_SHIFT(_i) ((0x3 - ((_i) & 0x3)) << 0x3) #define AR_WOW_LENGTH1_MASK(_i) (AR_WOW_LENGTH_MAX << AR_WOW_LEN1_SHIFT(_i)) -- 2.7.4