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rt2800: fix wrong TX power compensation

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commit 6e956da202 upstream.

We should not do temperature compensation on devices without
EXTERNAL_TX_ALC bit set (called DynamicTxAgcControl on vendor driver).
Such devices can have totally bogus TSSI parameters on the EEPROM,
but still threaded by us as valid and result doing wrong TX power
calculations.

This fix inability to connect to AP on slightly longer distance on
some Ralink chips/devices.

Reported-and-tested-by: Fabien ADAM <id2ndr@crocobox.org>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislaw Gruszka
2013-08-26 15:18:53 +02:00
committed by Greg Kroah-Hartman
parent 86f7c9950b
commit beb6f0e8d2
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/rt2x00/rt2800lib.c
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@@ -2766,6 +2766,13 @@ static int rt2800_get_gain_calibration_delta(struct rt2x00_dev *rt2x00dev)
u8 step;
int i;
/*
* First check if temperature compensation is supported.
*/
rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC_CONF1, &eeprom);
if (!rt2x00_get_field16(eeprom, EEPROM_NIC_CONF1_EXTERNAL_TX_ALC))
return 0;
/*
* Read TSSI boundaries for temperature compensation from
* the EEPROM.