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rt2x00: rt2800lib: optimize frequency offset adjustment

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Don't write the new value into the register if it is
the same as the old value to avoid unncessary USB bus
traffic with USB devices. The change also saves a few
cycle on MMIO based devices.

Based on the DPO_RT5572_LinuxSTA_2.6.0.1_20120629
driver.

Reference:
  RTMPAdjustFrequencyOffset 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 14:09:29 +02:00 committed by John W. Linville
parent c1fada4e5e
commit 6af1bdccab
1 changed files with 6 additions and 1 deletions
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7
drivers/net/wireless/rt2x00/rt2800lib.c
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@ -2497,13 +2497,18 @@ static void rt2800_config_channel_rf3053(struct rt2x00_dev *rt2x00dev,
static void rt2800_adjust_freq_offset(struct rt2x00_dev *rt2x00dev)
{
u8 freq_offset;
u8 rfcsr;
u8 rfcsr, prev_rfcsr;
freq_offset = rt2x00_get_field8(rt2x00dev->freq_offset, RFCSR17_CODE);
freq_offset = min_t(u8, freq_offset, FREQ_OFFSET_BOUND);
rt2800_rfcsr_read(rt2x00dev, 17, &rfcsr);
prev_rfcsr = rfcsr;
rt2x00_set_field8(&rfcsr, RFCSR17_CODE, freq_offset);
if (rfcsr == prev_rfcsr)
return;
rt2800_rfcsr_write(rt2x00dev, 17, rfcsr);
}