[PATCH 1/4] rt2x00: Fix failed SLEEP->AWAKE and AWAKE->SLEEP transitions.

[Gertjan van Wingerde <gwingerde@xxxxxxxxx>]

(Based on a patch created by Ondrej Zary)

In some circumstances the Ralink devices do not properly go to sleep
or wake up, with timeouts occurring.
Fix this by retrying telling the device that it has to wake up or
sleep.

Signed-off-by: Gertjan van Wingerde <gwingerde@xxxxxxxxx>
---
 drivers/net/wireless/rt2x00/rt2400pci.c |    9 +++++----
 drivers/net/wireless/rt2x00/rt2500pci.c |    9 +++++----
 drivers/net/wireless/rt2x00/rt61pci.c   |    7 ++++---
 drivers/net/wireless/rt2x00/rt73usb.c   |    7 ++++---
 4 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 641459b..7b36db2 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -925,7 +925,7 @@ static void rt2400pci_disable_radio(struct rt2x00_dev *rt2x00dev)
 static int rt2400pci_set_state(struct rt2x00_dev *rt2x00dev,
 			       enum dev_state state)
 {
-	u32 reg;
+	u32 reg, reg2;
 	unsigned int i;
 	char put_to_sleep;
 	char bbp_state;
@@ -946,11 +946,12 @@ static int rt2400pci_set_state(struct rt2x00_dev *rt2x00dev,
 	 * device has entered the correct state.
 	 */
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
-		rt2x00pci_register_read(rt2x00dev, PWRCSR1, &reg);
-		bbp_state = rt2x00_get_field32(reg, PWRCSR1_BBP_CURR_STATE);
-		rf_state = rt2x00_get_field32(reg, PWRCSR1_RF_CURR_STATE);
+		rt2x00pci_register_read(rt2x00dev, PWRCSR1, &reg2);
+		bbp_state = rt2x00_get_field32(reg2, PWRCSR1_BBP_CURR_STATE);
+		rf_state = rt2x00_get_field32(reg2, PWRCSR1_RF_CURR_STATE);
 		if (bbp_state == state && rf_state == state)
 			return 0;
+		rt2x00pci_register_write(rt2x00dev, PWRCSR1, reg);
 		msleep(10);
 	}
 
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index c8363bc..4a29ede 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1083,7 +1083,7 @@ static void rt2500pci_disable_radio(struct rt2x00_dev *rt2x00dev)
 static int rt2500pci_set_state(struct rt2x00_dev *rt2x00dev,
 			       enum dev_state state)
 {
-	u32 reg;
+	u32 reg, reg2;
 	unsigned int i;
 	char put_to_sleep;
 	char bbp_state;
@@ -1104,11 +1104,12 @@ static int rt2500pci_set_state(struct rt2x00_dev *rt2x00dev,
 	 * device has entered the correct state.
 	 */
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
-		rt2x00pci_register_read(rt2x00dev, PWRCSR1, &reg);
-		bbp_state = rt2x00_get_field32(reg, PWRCSR1_BBP_CURR_STATE);
-		rf_state = rt2x00_get_field32(reg, PWRCSR1_RF_CURR_STATE);
+		rt2x00pci_register_read(rt2x00dev, PWRCSR1, &reg2);
+		bbp_state = rt2x00_get_field32(reg2, PWRCSR1_BBP_CURR_STATE);
+		rf_state = rt2x00_get_field32(reg2, PWRCSR1_RF_CURR_STATE);
 		if (bbp_state == state && rf_state == state)
 			return 0;
+		rt2x00pci_register_write(rt2x00dev, PWRCSR1, reg);
 		msleep(10);
 	}
 
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index 9ac2f5c..a03b6a2 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -1688,7 +1688,7 @@ static void rt61pci_disable_radio(struct rt2x00_dev *rt2x00dev)
 
 static int rt61pci_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 {
-	u32 reg;
+	u32 reg, reg2;
 	unsigned int i;
 	char put_to_sleep;
 
@@ -1705,10 +1705,11 @@ static int rt61pci_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 	 * device has entered the correct state.
 	 */
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
-		rt2x00pci_register_read(rt2x00dev, MAC_CSR12, &reg);
-		state = rt2x00_get_field32(reg, MAC_CSR12_BBP_CURRENT_STATE);
+		rt2x00pci_register_read(rt2x00dev, MAC_CSR12, &reg2);
+		state = rt2x00_get_field32(reg2, MAC_CSR12_BBP_CURRENT_STATE);
 		if (state == !put_to_sleep)
 			return 0;
+		rt2x00pci_register_write(rt2x00dev, MAC_CSR12, reg);
 		msleep(10);
 	}
 
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index a9738ee..dc4a028 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1365,7 +1365,7 @@ static void rt73usb_disable_radio(struct rt2x00_dev *rt2x00dev)
 
 static int rt73usb_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 {
-	u32 reg;
+	u32 reg, reg2;
 	unsigned int i;
 	char put_to_sleep;
 
@@ -1382,10 +1382,11 @@ static int rt73usb_set_state(struct rt2x00_dev *rt2x00dev, enum dev_state state)
 	 * device has entered the correct state.
 	 */
 	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
-		rt2x00usb_register_read(rt2x00dev, MAC_CSR12, &reg);
-		state = rt2x00_get_field32(reg, MAC_CSR12_BBP_CURRENT_STATE);
+		rt2x00usb_register_read(rt2x00dev, MAC_CSR12, &reg2);
+		state = rt2x00_get_field32(reg2, MAC_CSR12_BBP_CURRENT_STATE);
 		if (state == !put_to_sleep)
 			return 0;
+		rt2x00usb_register_write(rt2x00dev, MAC_CSR12, reg);
 		msleep(10);
 	}
 
-- 
1.7.1

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