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authorIvo van Doorn <ivdoorn@gmail.com>2008-08-06 16:22:17 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-08-22 16:29:59 -0400
commitba2ab47129eee76f6f0ef52b4beae30a12cee7f6 (patch)
treeaded96a0180e0e09122f1400a307f8d3d525feb0
parent48c2fc59aa415ba92be0ad3a7e741c46883e3944 (diff)
rt2x00: Move lna_gain calculation to config() callback
We can optimize lna calculation in IRQ context by calculating most of the value during the config() callback when most of the value is actually influenced. This will be required later by rt2800pci and rt2800usb as well, since they need the lna_gain value during config(). Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00.h5
-rw-r--r--drivers/net/wireless/rt2x00/rt61pci.c48
-rw-r--r--drivers/net/wireless/rt2x00/rt73usb.c41
3 files changed, 63 insertions, 31 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index ced0a525176..3fa3d5b006a 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -804,6 +804,11 @@ struct rt2x00_dev {
u32 *rf;
/*
+ * LNA gain
+ */
+ short lna_gain;
+
+ /*
* USB Max frame size (for rt2500usb & rt73usb).
*/
u16 usb_maxpacket;
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index 87012f88461..0fcc4563683 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -638,6 +638,30 @@ static void rt61pci_config_erp(struct rt2x00_dev *rt2x00dev,
rt2x00pci_register_write(rt2x00dev, TXRX_CSR4, reg);
}
+
+static void rt61pci_config_lna_gain(struct rt2x00_dev *rt2x00dev,
+ struct rt2x00lib_conf *libconf)
+{
+ u16 eeprom;
+ short lna_gain = 0;
+
+ if (libconf->band == IEEE80211_BAND_2GHZ) {
+ if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags))
+ lna_gain += 14;
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &eeprom);
+ lna_gain -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_BG_1);
+ } else {
+ if (test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags))
+ lna_gain += 14;
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &eeprom);
+ lna_gain -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_A_1);
+ }
+
+ rt2x00dev->lna_gain = lna_gain;
+}
+
static void rt61pci_config_phymode(struct rt2x00_dev *rt2x00dev,
const int basic_rate_mask)
{
@@ -956,6 +980,9 @@ static void rt61pci_config(struct rt2x00_dev *rt2x00dev,
struct rt2x00lib_conf *libconf,
const unsigned int flags)
{
+ /* Always recalculate LNA gain before changing configuration */
+ rt61pci_config_lna_gain(rt2x00dev, libconf);
+
if (flags & CONFIG_UPDATE_PHYMODE)
rt61pci_config_phymode(rt2x00dev, libconf->basic_rates);
if (flags & CONFIG_UPDATE_CHANNEL)
@@ -1883,40 +1910,27 @@ static void rt61pci_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
*/
static int rt61pci_agc_to_rssi(struct rt2x00_dev *rt2x00dev, int rxd_w1)
{
- u16 eeprom;
- u8 offset;
+ u8 offset = rt2x00dev->lna_gain;
u8 lna;
lna = rt2x00_get_field32(rxd_w1, RXD_W1_RSSI_LNA);
switch (lna) {
case 3:
- offset = 90;
+ offset += 90;
break;
case 2:
- offset = 74;
+ offset += 74;
break;
case 1:
- offset = 64;
+ offset += 64;
break;
default:
return 0;
}
if (rt2x00dev->rx_status.band == IEEE80211_BAND_5GHZ) {
- if (test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags))
- offset += 14;
-
if (lna == 3 || lna == 2)
offset += 10;
-
- rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &eeprom);
- offset -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_A_1);
- } else {
- if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags))
- offset += 14;
-
- rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &eeprom);
- offset -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_BG_1);
}
return rt2x00_get_field32(rxd_w1, RXD_W1_RSSI_AGC) * 2 - offset;
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 1bd6b3ffca0..4f2eb90aaf0 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -664,6 +664,26 @@ static void rt73usb_config_erp(struct rt2x00_dev *rt2x00dev,
rt73usb_register_write(rt2x00dev, TXRX_CSR4, reg);
}
+static void rt73usb_config_lna_gain(struct rt2x00_dev *rt2x00dev,
+ struct rt2x00lib_conf *libconf)
+{
+ u16 eeprom;
+ short lna_gain = 0;
+
+ if (libconf->band == IEEE80211_BAND_2GHZ) {
+ if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags))
+ lna_gain += 14;
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &eeprom);
+ lna_gain -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_BG_1);
+ } else {
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &eeprom);
+ lna_gain -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_A_1);
+ }
+
+ rt2x00dev->lna_gain = lna_gain;
+}
+
static void rt73usb_config_phymode(struct rt2x00_dev *rt2x00dev,
const int basic_rate_mask)
{
@@ -918,6 +938,9 @@ static void rt73usb_config(struct rt2x00_dev *rt2x00dev,
struct rt2x00lib_conf *libconf,
const unsigned int flags)
{
+ /* Always recalculate LNA gain before changing configuration */
+ rt73usb_config_lna_gain(rt2x00dev, libconf);
+
if (flags & CONFIG_UPDATE_PHYMODE)
rt73usb_config_phymode(rt2x00dev, libconf->basic_rates);
if (flags & CONFIG_UPDATE_CHANNEL)
@@ -1644,20 +1667,19 @@ static void rt73usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
*/
static int rt73usb_agc_to_rssi(struct rt2x00_dev *rt2x00dev, int rxd_w1)
{
- u16 eeprom;
- u8 offset;
+ u8 offset = rt2x00dev->lna_gain;
u8 lna;
lna = rt2x00_get_field32(rxd_w1, RXD_W1_RSSI_LNA);
switch (lna) {
case 3:
- offset = 90;
+ offset += 90;
break;
case 2:
- offset = 74;
+ offset += 74;
break;
case 1:
- offset = 64;
+ offset += 64;
break;
default:
return 0;
@@ -1673,15 +1695,6 @@ static int rt73usb_agc_to_rssi(struct rt2x00_dev *rt2x00dev, int rxd_w1)
else if (lna == 2)
offset += 8;
}
-
- rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_A, &eeprom);
- offset -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_A_1);
- } else {
- if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags))
- offset += 14;
-
- rt2x00_eeprom_read(rt2x00dev, EEPROM_RSSI_OFFSET_BG, &eeprom);
- offset -= rt2x00_get_field16(eeprom, EEPROM_RSSI_OFFSET_BG_1);
}
return rt2x00_get_field32(rxd_w1, RXD_W1_RSSI_AGC) * 2 - offset;