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rt2x00: Add watchdog functions for HW queue

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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>
This commit is contained in:
Ivo van Doorn
2010-11-06 15:49:01 +01:00
committed by John W. Linville
parent ea175ee262
commit 8c5765fda4
2 changed files with 58 additions and 3 deletions
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45
drivers/net/wireless/rt2x00/rt2800usb.c
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@@ -242,6 +242,49 @@ static int rt2800usb_set_device_state(struct rt2x00_dev *rt2x00dev,
return retval;
}
/*
* 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
*/
@@ -534,7 +577,7 @@ static const struct rt2x00lib_ops rt2800usb_rt2x00_ops = {
.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,