rt2x00: Use pretbtt irq for fetching beacons on rt2800pci
Updating the beacon on pre tbtt instead of beacondone allows much lower
latency in regard to TIM updates. Hence, use the pre tbtt interrupt for
updating the beacon in rt2800pci (older devices don't provide a pre tbtt
interrupt).
Also, add a new driver flag to indicate if a driver has pre tbtt support
or not and implement the according behavior in rt2x00lib.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index f21b77c..c0c38f9 100644
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -938,20 +938,32 @@
u32 reg = rt2x00dev->irqvalue[0];
/*
- * 1 - Rx ring done interrupt.
+ * 1 - Pre TBTT interrupt.
*/
- if (rt2x00_get_field32(reg, INT_SOURCE_CSR_RX_DONE))
- rt2x00pci_rxdone(rt2x00dev);
-
- if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS))
- rt2800pci_txdone(rt2x00dev);
+ if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT))
+ rt2x00lib_pretbtt(rt2x00dev);
/*
- * Current beacon was sent out, fetch the next one
+ * 2 - Beacondone interrupt.
*/
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TBTT))
rt2x00lib_beacondone(rt2x00dev);
+ /*
+ * 3 - Rx ring done interrupt.
+ */
+ if (rt2x00_get_field32(reg, INT_SOURCE_CSR_RX_DONE))
+ rt2x00pci_rxdone(rt2x00dev);
+
+ /*
+ * 4 - Tx done interrupt.
+ */
+ if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS))
+ rt2800pci_txdone(rt2x00dev);
+
+ /*
+ * 5 - Auto wakeup interrupt.
+ */
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_AUTO_WAKEUP))
rt2800pci_wakeup(rt2x00dev);
@@ -1052,6 +1064,12 @@
__set_bit(DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL, &rt2x00dev->flags);
/*
+ * This device has a pre tbtt interrupt and thus fetches
+ * a new beacon directly prior to transmission.
+ */
+ __set_bit(DRIVER_SUPPORT_PRE_TBTT_INTERRUPT, &rt2x00dev->flags);
+
+ /*
* This device requires firmware.
*/
if (!rt2x00_is_soc(rt2x00dev))