ath9k: Fix HW wait timeout
RX and calibration have different timeout requirements.
This patch fixes it by changing the HW wait routine
to accept a timeout value.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/calib.c b/drivers/net/wireless/ath9k/calib.c
index e5abe65..93c6e1f 100644
--- a/drivers/net/wireless/ath9k/calib.c
+++ b/drivers/net/wireless/ath9k/calib.c
@@ -893,7 +893,8 @@
AR_PHY_AGC_CONTROL_CAL);
if (!ath9k_hw_wait(ah, AR_PHY_AGC_CONTROL,
- AR_PHY_AGC_CONTROL_CAL, 0)) {
+ AR_PHY_AGC_CONTROL_CAL, 0,
+ AH_WAIT_TIMEOUT)) {
DPRINTF(ah->ah_sc, ATH_DBG_CALIBRATE,
"offset calibration failed to complete in 1ms; "
"noisy environment?\n");
@@ -910,7 +911,8 @@
REG_READ(ah, AR_PHY_AGC_CONTROL) |
AR_PHY_AGC_CONTROL_CAL);
- if (!ath9k_hw_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) {
+ if (!ath9k_hw_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL,
+ 0, AH_WAIT_TIMEOUT)) {
DPRINTF(ah->ah_sc, ATH_DBG_CALIBRATE,
"offset calibration failed to complete in 1ms; "
"noisy environment?\n");
diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 1c02358..eeee5b8 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -84,11 +84,13 @@
return ath9k_hw_mac_clks(ah, usecs);
}
-bool ath9k_hw_wait(struct ath_hw *ah, u32 reg, u32 mask, u32 val)
+bool ath9k_hw_wait(struct ath_hw *ah, u32 reg, u32 mask, u32 val, u32 timeout)
{
int i;
- for (i = 0; i < (AH_TIMEOUT / AH_TIME_QUANTUM); i++) {
+ BUG_ON(timeout < AH_TIME_QUANTUM);
+
+ for (i = 0; i < (timeout / AH_TIME_QUANTUM); i++) {
if ((REG_READ(ah, reg) & mask) == val)
return true;
@@ -96,8 +98,8 @@
}
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
- "timeout on reg 0x%x: 0x%08x & 0x%08x != 0x%08x\n",
- reg, REG_READ(ah, reg), mask, val);
+ "timeout (%d us) on reg 0x%x: 0x%08x & 0x%08x != 0x%08x\n",
+ timeout, reg, REG_READ(ah, reg), mask, val);
return false;
}
@@ -1516,7 +1518,7 @@
udelay(50);
REG_WRITE(ah, AR_RTC_RC, 0);
- if (!ath9k_hw_wait(ah, AR_RTC_RC, AR_RTC_RC_M, 0)) {
+ if (!ath9k_hw_wait(ah, AR_RTC_RC, AR_RTC_RC_M, 0, AH_WAIT_TIMEOUT)) {
DPRINTF(ah->ah_sc, ATH_DBG_RESET,
"RTC stuck in MAC reset\n");
return false;
@@ -1545,7 +1547,8 @@
if (!ath9k_hw_wait(ah,
AR_RTC_STATUS,
AR_RTC_STATUS_M,
- AR_RTC_STATUS_ON)) {
+ AR_RTC_STATUS_ON,
+ AH_WAIT_TIMEOUT)) {
DPRINTF(ah->ah_sc, ATH_DBG_RESET, "RTC not waking up\n");
return false;
}
@@ -1640,7 +1643,7 @@
REG_WRITE(ah, AR_PHY_RFBUS_REQ, AR_PHY_RFBUS_REQ_EN);
if (!ath9k_hw_wait(ah, AR_PHY_RFBUS_GRANT, AR_PHY_RFBUS_GRANT_EN,
- AR_PHY_RFBUS_GRANT_EN)) {
+ AR_PHY_RFBUS_GRANT_EN, AH_WAIT_TIMEOUT)) {
DPRINTF(ah->ah_sc, ATH_DBG_REG_IO,
"Could not kill baseband RX\n");
return false;
diff --git a/drivers/net/wireless/ath9k/hw.h b/drivers/net/wireless/ath9k/hw.h
index 08469d9..ddab3b7 100644
--- a/drivers/net/wireless/ath9k/hw.h
+++ b/drivers/net/wireless/ath9k/hw.h
@@ -93,7 +93,7 @@
#define ATH9K_NUM_QUEUES 10
#define MAX_RATE_POWER 63
-#define AH_TIMEOUT 100000
+#define AH_WAIT_TIMEOUT 100000 /* (us) */
#define AH_TIME_QUANTUM 10
#define AR_KEYTABLE_SIZE 128
#define POWER_UP_TIME 200000
@@ -612,7 +612,7 @@
u8 *antenna_cfgd);
/* General Operation */
-bool ath9k_hw_wait(struct ath_hw *ah, u32 reg, u32 mask, u32 val);
+bool ath9k_hw_wait(struct ath_hw *ah, u32 reg, u32 mask, u32 val, u32 timeout);
u32 ath9k_hw_reverse_bits(u32 val, u32 n);
bool ath9k_get_channel_edges(struct ath_hw *ah, u16 flags, u16 *low, u16 *high);
u16 ath9k_hw_computetxtime(struct ath_hw *ah, struct ath_rate_table *rates,
diff --git a/drivers/net/wireless/ath9k/mac.c b/drivers/net/wireless/ath9k/mac.c
index f32c622..a6c2042 100644
--- a/drivers/net/wireless/ath9k/mac.c
+++ b/drivers/net/wireless/ath9k/mac.c
@@ -886,7 +886,8 @@
REG_SET_BIT(ah, AR_DIAG_SW,
(AR_DIAG_RX_DIS | AR_DIAG_RX_ABORT));
- if (!ath9k_hw_wait(ah, AR_OBS_BUS_1, AR_OBS_BUS_1_RX_STATE, 0)) {
+ if (!ath9k_hw_wait(ah, AR_OBS_BUS_1, AR_OBS_BUS_1_RX_STATE,
+ 0, AH_WAIT_TIMEOUT)) {
REG_CLR_BIT(ah, AR_DIAG_SW,
(AR_DIAG_RX_DIS |
AR_DIAG_RX_ABORT));
@@ -933,15 +934,32 @@
bool ath9k_hw_stopdmarecv(struct ath_hw *ah)
{
+#define AH_RX_STOP_DMA_TIMEOUT 10000 /* usec */
+#define AH_RX_TIME_QUANTUM 100 /* usec */
+
+ int i;
+
REG_WRITE(ah, AR_CR, AR_CR_RXD);
- if (!ath9k_hw_wait(ah, AR_CR, AR_CR_RXE, 0)) {
+ /* Wait for rx enable bit to go low */
+ for (i = AH_RX_STOP_DMA_TIMEOUT / AH_TIME_QUANTUM; i != 0; i--) {
+ if ((REG_READ(ah, AR_CR) & AR_CR_RXE) == 0)
+ break;
+ udelay(AH_TIME_QUANTUM);
+ }
+
+ if (i == 0) {
DPRINTF(ah->ah_sc, ATH_DBG_QUEUE,
- "dma failed to stop in 10ms\n"
- "AR_CR=0x%08x\nAR_DIAG_SW=0x%08x\n",
- REG_READ(ah, AR_CR), REG_READ(ah, AR_DIAG_SW));
+ "dma failed to stop in %d ms "
+ "AR_CR=0x%08x AR_DIAG_SW=0x%08x\n",
+ AH_RX_STOP_DMA_TIMEOUT / 1000,
+ REG_READ(ah, AR_CR),
+ REG_READ(ah, AR_DIAG_SW));
return false;
} else {
return true;
}
+
+#undef AH_RX_TIME_QUANTUM
+#undef AH_RX_STOP_DMA_TIMEOUT
}
diff --git a/drivers/net/wireless/ath9k/pci.c b/drivers/net/wireless/ath9k/pci.c
index c28afe4..a70f954 100644
--- a/drivers/net/wireless/ath9k/pci.c
+++ b/drivers/net/wireless/ath9k/pci.c
@@ -63,7 +63,8 @@
if (!ath9k_hw_wait(ah,
AR_EEPROM_STATUS_DATA,
AR_EEPROM_STATUS_DATA_BUSY |
- AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0)) {
+ AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0,
+ AH_WAIT_TIMEOUT)) {
return false;
}
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index 08f676a..28ad1d5 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -427,7 +427,6 @@
ath9k_hw_stoppcurecv(ah);
ath9k_hw_setrxfilter(ah, 0);
stopped = ath9k_hw_stopdmarecv(ah);
- mdelay(3); /* 3ms is long enough for 1 frame */
sc->rx.rxlink = NULL;
return stopped;