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rt2x00: rt2800lib: use step-by-step frequency offset adjustment on MMIO devices 

According to the DPO_RT5572_LinuxSTA_2.6.0.1_20120629
driver, the RFCSR17 register can't be programmed in
one step on devices which are using the frequency
offset adjustment code.

Update the code to use step-by-step adjustment.

Reference:
  RT30xxWriteRFRegister function in common/rt_rf.c

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Gabor Juhos 2013-08-17 14:09:31 +02:00 committed by John W. Linville
parent 76773f301f
commit 8d38eca8e0
1 changed files with 16 additions and 3 deletions
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19
drivers/net/wireless/rt2x00/rt2800lib.c
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@ -2496,7 +2496,7 @@ static void rt2800_config_channel_rf3053(struct rt2x00_dev *rt2x00dev,
static void rt2800_adjust_freq_offset(struct rt2x00_dev *rt2x00dev)
{
u8 freq_offset;
u8 freq_offset, prev_freq_offset;
u8 rfcsr, prev_rfcsr;
freq_offset = rt2x00_get_field8(rt2x00dev->freq_offset, RFCSR17_CODE);
@ -2509,11 +2509,24 @@ static void rt2800_adjust_freq_offset(struct rt2x00_dev *rt2x00dev)
if (rfcsr == prev_rfcsr)
return;
if (rt2x00_is_usb(rt2x00dev))
if (rt2x00_is_usb(rt2x00dev)) {
rt2800_mcu_request(rt2x00dev, MCU_FREQ_OFFSET, 0xff,
freq_offset, prev_rfcsr);
else
return;
}
prev_freq_offset = rt2x00_get_field8(prev_rfcsr, RFCSR17_CODE);
while (prev_freq_offset != freq_offset) {
if (prev_freq_offset < freq_offset)
prev_freq_offset++;
else
prev_freq_offset--;
rt2x00_set_field8(&rfcsr, RFCSR17_CODE, prev_freq_offset);
rt2800_rfcsr_write(rt2x00dev, 17, rfcsr);
usleep_range(1000, 1500);
}
}
static void rt2800_config_channel_rf3290(struct rt2x00_dev *rt2x00dev,