rt2x00: Hardcode TX ack timeout and consume time

The calculated values for the ACK timeout and ACK
consume time are different then the values as
used by the Legacy drivers.

After testing from James Ledwith it appeared that
the calculated values caused a high amount of TX
failures, and the values from the Legacy drivers
were the most optimal to prevent TX failure due to
excessive retries.

The symptoms of this problem:
 - Rate control module always falls back to 1Mbs
 - Low throughput when bitrate was fixed

Possible side-effects (not confirmed but highly likely)
 - Problems with DHCP
 - Broken connections due to lack of probe response

This should fix at least:
Kernel bugzilla reports: [13362], [13009], [9273]
Fedora bugzilla reports: [443203]
but possible some additional bugs as well.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

8 files changed, 7 insertions, 28 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 164df9347a2..798f625e38f 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -331,9 +331,8 @@ static void rt2400pci_config_erp(struct rt2x00_dev *rt2x00dev,
 	preamble_mask = erp->short_preamble << 3;
 
 	rt2x00pci_register_read(rt2x00dev, TXCSR1, &reg);
-	rt2x00_set_field32(&reg, TXCSR1_ACK_TIMEOUT, erp->ack_timeout);
-	rt2x00_set_field32(&reg, TXCSR1_ACK_CONSUME_TIME,
-			   erp->ack_consume_time);
+	rt2x00_set_field32(&reg, TXCSR1_ACK_TIMEOUT, 0x1ff);
+	rt2x00_set_field32(&reg, TXCSR1_ACK_CONSUME_TIME, 0x13a);
 	rt2x00_set_field32(&reg, TXCSR1_TSF_OFFSET, IEEE80211_HEADER);
 	rt2x00_set_field32(&reg, TXCSR1_AUTORESPONDER, 1);
 	rt2x00pci_register_write(rt2x00dev, TXCSR1, reg);
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index 4186582f277..2e872ac6982 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -337,9 +337,8 @@ static void rt2500pci_config_erp(struct rt2x00_dev *rt2x00dev,
 	preamble_mask = erp->short_preamble << 3;
 
 	rt2x00pci_register_read(rt2x00dev, TXCSR1, &reg);
-	rt2x00_set_field32(&reg, TXCSR1_ACK_TIMEOUT, erp->ack_timeout);
-	rt2x00_set_field32(&reg, TXCSR1_ACK_CONSUME_TIME,
-			   erp->ack_consume_time);
+	rt2x00_set_field32(&reg, TXCSR1_ACK_TIMEOUT, 0x162);
+	rt2x00_set_field32(&reg, TXCSR1_ACK_CONSUME_TIME, 0xa2);
 	rt2x00_set_field32(&reg, TXCSR1_TSF_OFFSET, IEEE80211_HEADER);
 	rt2x00_set_field32(&reg, TXCSR1_AUTORESPONDER, 1);
 	rt2x00pci_register_write(rt2x00dev, TXCSR1, reg);
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index b04f59bab3b..22dd6d9e298 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -488,10 +488,6 @@ static void rt2500usb_config_erp(struct rt2x00_dev *rt2x00dev,
 {
 	u16 reg;
 
-	rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
-	rt2x00_set_field16(&reg, TXRX_CSR1_ACK_TIMEOUT, erp->ack_timeout);
-	rt2500usb_register_write(rt2x00dev, TXRX_CSR1, reg);
-
 	rt2500usb_register_read(rt2x00dev, TXRX_CSR10, &reg);
 	rt2x00_set_field16(&reg, TXRX_CSR10_AUTORESPOND_PREAMBLE,
 			   !!erp->short_preamble);
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 639dc6cc04b..a084077a1c6 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -580,8 +580,7 @@ static void rt2800usb_config_erp(struct rt2x00_dev *rt2x00dev,
 	u32 reg;
 
 	rt2x00usb_register_read(rt2x00dev, TX_TIMEOUT_CFG, &reg);
-	rt2x00_set_field32(&reg, TX_TIMEOUT_CFG_RX_ACK_TIMEOUT,
-			   DIV_ROUND_UP(erp->ack_timeout, erp->slot_time));
+	rt2x00_set_field32(&reg, TX_TIMEOUT_CFG_RX_ACK_TIMEOUT, 0x20);
 	rt2x00usb_register_write(rt2x00dev, TX_TIMEOUT_CFG, reg);
 
 	rt2x00usb_register_read(rt2x00dev, AUTO_RSP_CFG, &reg);
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 555a777db6d..27bc6b7fbfd 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -417,9 +417,6 @@ struct rt2x00lib_erp {
 	int short_preamble;
 	int cts_protection;
 
-	int ack_timeout;
-	int ack_consume_time;
-
 	u32 basic_rates;
 
 	int slot_time;
diff --git a/drivers/net/wireless/rt2x00/rt2x00config.c b/drivers/net/wireless/rt2x00/rt2x00config.c
index 3501788ab49..40a201e2e15 100644
--- a/drivers/net/wireless/rt2x00/rt2x00config.c
+++ b/drivers/net/wireless/rt2x00/rt2x00config.c
@@ -94,17 +94,6 @@ void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
 	erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
 	erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
 
-	erp.ack_timeout = PLCP + erp.difs + GET_DURATION(ACK_SIZE, 10);
-	erp.ack_consume_time = SIFS + PLCP + GET_DURATION(ACK_SIZE, 10);
-
-	if (bss_conf->use_short_preamble) {
-		erp.ack_timeout += SHORT_PREAMBLE;
-		erp.ack_consume_time += SHORT_PREAMBLE;
-	} else {
-		erp.ack_timeout += PREAMBLE;
-		erp.ack_consume_time += PREAMBLE;
-	}
-
 	erp.basic_rates = bss_conf->basic_rates;
 	erp.beacon_int = bss_conf->beacon_int;
 
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index f4b4b86da4d..b20e3eac9d6 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -598,7 +598,7 @@ static void rt61pci_config_erp(struct rt2x00_dev *rt2x00dev,
 	u32 reg;
 
 	rt2x00pci_register_read(rt2x00dev, TXRX_CSR0, &reg);
-	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, erp->ack_timeout);
+	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, 0x32);
 	rt2x00_set_field32(&reg, TXRX_CSR0_TSF_OFFSET, IEEE80211_HEADER);
 	rt2x00pci_register_write(rt2x00dev, TXRX_CSR0, reg);
 
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 90e11726305..1cbd9b4a3ef 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -561,7 +561,7 @@ static void rt73usb_config_erp(struct rt2x00_dev *rt2x00dev,
 	u32 reg;
 
 	rt2x00usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
-	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, erp->ack_timeout);
+	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, 0x32);
 	rt2x00_set_field32(&reg, TXRX_CSR0_TSF_OFFSET, IEEE80211_HEADER);
 	rt2x00usb_register_write(rt2x00dev, TXRX_CSR0, reg);