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rt2x00: Fix transmit power troubles on some Ralink RT30xx cards

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Some cards on Ralink RT30xx chipset not have correctly TX_MIXER_GAIN
value in them EEPROM/EFUSE. In this case, we must use default value,
but always used EEPROM/EFUSE value. As result we have tranmitt power
range from -10dBm to +6dBm instead 0dBm to +16dBm.

Correctly value in EEPROM/EFUSE is one or more for RT3070 and two or
more for other RT30xx chips.

Tested on Canyon CNP-WF518N1 usb Wi-Fi dongle and Jorjin WN8020 usb
embedded Wi-Fi module.

Signed-off-by: Alex A. Mihaylov <minimumlaw@rambler.ru>
Cc: stable@vger.kernel.org
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Alex A. Mihaylov 2013-04-15 07:29:35 +04:00 committed by John W. Linville
parent 3f524559cf
commit 7e9dafd873
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/rt2x00/rt2800lib.c
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@ -5036,6 +5036,8 @@ static int rt2800_init_rfcsr(struct rt2x00_dev *rt2x00dev)
if (!rt2x00_rt(rt2x00dev, RT5390) &&
!rt2x00_rt(rt2x00dev, RT5392)) {
u8 min_gain = rt2x00_rt(rt2x00dev, RT3070) ? 1 : 2;
rt2800_rfcsr_read(rt2x00dev, 17, &rfcsr);
rt2x00_set_field8(&rfcsr, RFCSR17_TX_LO1_EN, 0);
if (rt2x00_rt(rt2x00dev, RT3070) ||
@ -5046,8 +5048,10 @@ static int rt2800_init_rfcsr(struct rt2x00_dev *rt2x00dev)
&rt2x00dev->cap_flags))
rt2x00_set_field8(&rfcsr, RFCSR17_R, 1);
}
rt2x00_set_field8(&rfcsr, RFCSR17_TXMIXER_GAIN,
drv_data->txmixer_gain_24g);
if (drv_data->txmixer_gain_24g >= min_gain) {
rt2x00_set_field8(&rfcsr, RFCSR17_TXMIXER_GAIN,
drv_data->txmixer_gain_24g);
}
rt2800_rfcsr_write(rt2x00dev, 17, rfcsr);
}