commit 8c5765fda4b382acce4ff386e18ec11790dff893
author Ivo van Doorn <IvDoorn@gmail.com> Sat Nov 06 15:49:01 2010 +0100
committer John W. Linville <linville@tuxdriver.com> Mon Nov 15 13:26:36 2010 -0500
tree 26859992b48faf7f6c93ceaad6dd20dcdcf303cf
parent ea175ee26268370ca07aff91cf6ba1e0f1a3bd36

rt2x00: Add watchdog functions for HW queue

Add watchdog functions for managing the Queues inside the hardware.
Normally the driver doesn't have much to do with these queues
directly, but the Ralink drivers did implement watchdog functions
for these. These watchdog functions are not triggered that often,
compared to the other watchdog functions, but I have at least
seen them trigger once or twice during a long stresstest run.

v2: Add extra documentation for register fields

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

drivers/net/wireless/rt2x00/rt2800usb.c

diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index f933371..389ecba 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -243,6 +243,49 @@
 }
 
 /*
+ * Watchdog handlers
+ */
+static void rt2800usb_watchdog(struct rt2x00_dev *rt2x00dev)
+{
+	unsigned int i;
+	u32 reg;
+
+	rt2800_register_read(rt2x00dev, TXRXQ_PCNT, &reg);
+	if (rt2x00_get_field32(reg, TXRXQ_PCNT_TX0Q)) {
+		WARNING(rt2x00dev, "TX HW queue 0 timed out,"
+			" invoke forced kick");
+
+		rt2800_register_write(rt2x00dev, PBF_CFG, 0xf40012);
+
+		for (i = 0; i < 10; i++) {
+			udelay(10);
+			if (!rt2x00_get_field32(reg, TXRXQ_PCNT_TX0Q))
+				break;
+		}
+
+		rt2800_register_write(rt2x00dev, PBF_CFG, 0xf40006);
+	}
+
+	rt2800_register_read(rt2x00dev, TXRXQ_PCNT, &reg);
+	if (rt2x00_get_field32(reg, TXRXQ_PCNT_TX1Q)) {
+		WARNING(rt2x00dev, "TX HW queue 1 timed out,"
+			" invoke forced kick");
+
+		rt2800_register_write(rt2x00dev, PBF_CFG, 0xf4000a);
+
+		for (i = 0; i < 10; i++) {
+			udelay(10);
+			if (!rt2x00_get_field32(reg, TXRXQ_PCNT_TX1Q))
+				break;
+		}
+
+		rt2800_register_write(rt2x00dev, PBF_CFG, 0xf40006);
+	}
+
+	rt2x00usb_watchdog(rt2x00dev);
+}
+
+/*
  * TX descriptor initialization
  */
 static __le32 *rt2800usb_get_txwi(struct queue_entry *entry)
@@ -534,7 +577,7 @@
 	.link_stats		= rt2800_link_stats,
 	.reset_tuner		= rt2800_reset_tuner,
 	.link_tuner		= rt2800_link_tuner,
-	.watchdog		= rt2x00usb_watchdog,
+	.watchdog		= rt2800usb_watchdog,
 	.write_tx_desc		= rt2800usb_write_tx_desc,
 	.write_tx_data		= rt2800_write_tx_data,
 	.write_beacon		= rt2800_write_beacon,