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ath9k_hw: Fix and complete force bias for AR5416

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Force bias is a fix for usage of AR5416 radios on the 2.4 GHz band
for orientation sensitivity. This was only partially implemented
with the ath9k_hw_decrease_chain_power() but first -- this was being
called for all chipsets which is not correct and second -- it was
missing the actual orientation code.

We now ensure to only enable force bias only for AR5416 and BUG_ON()
on other chipsets. Although ath9k_hw_decrease_chain_power() was enabled
for newer chipsets I suspect that it never ran unless the EEPROM had
ATH9K_ANT_FIXED_A or ATH9K_ANT_FIXED_B for antenna diversity.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-10-19 02:33:45 -04:00 committed by John W. Linville
parent 896ff26035
commit a776582861
2 changed files with 73 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/ath/ath9k/hw.c
View File

@ -2055,6 +2055,8 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
ah->ath9k_hw_spur_mitigate_freq(ah, chan);
ah->eep_ops->set_board_values(ah, chan);
if (AR_SREV_5416(ah))
ath9k_hw_decrease_chain_power(ah, chan);
REG_WRITE(ah, AR_STA_ID0, get_unaligned_le32(common->macaddr));

70
drivers/net/wireless/ath/ath9k/phy.c
View File

@ -41,6 +41,10 @@
#include "hw.h"
static void ath9k_phy_modify_rx_buffer(u32 *rfBuf, u32 reg32,
u32 numBits, u32 firstBit,
u32 column);
/**
* ath9k_hw_write_regs - ??
*
@ -429,6 +433,67 @@ void ath9k_hw_9280_spur_mitigate(struct ath_hw *ah, struct ath9k_channel *chan)
/* All code below is for non single-chip solutions */
/*
* Fix on 2.4 GHz band for orientation sensitivity issue by increasing
* rf_pwd_icsyndiv.
*
* Theoretical Rules:
* if 2 GHz band
* if forceBiasAuto
* if synth_freq < 2412
* bias = 0
* else if 2412 <= synth_freq <= 2422
* bias = 1
* else // synth_freq > 2422
* bias = 2
* else if forceBias > 0
* bias = forceBias & 7
* else
* no change, use value from ini file
* else
* no change, invalid band
*
* 1st Mod:
* 2422 also uses value of 2
* <approved>
*
* 2nd Mod:
* Less than 2412 uses value of 0, 2412 and above uses value of 2
*/
static void ath9k_hw_force_bias(struct ath_hw *ah, u16 synth_freq)
{
struct ath_common *common = ath9k_hw_common(ah);
u32 tmp_reg;
int reg_writes = 0;
u32 new_bias = 0;
if (!AR_SREV_5416(ah) || synth_freq >= 3000) {
return;
}
BUG_ON(AR_SREV_9280_10_OR_LATER(ah));
if (synth_freq < 2412)
new_bias = 0;
else if (synth_freq < 2422)
new_bias = 1;
else
new_bias = 2;
/* pre-reverse this field */
tmp_reg = ath9k_hw_reverse_bits(new_bias, 3);
ath_print(common, ATH_DBG_CONFIG,
"Force rf_pwd_icsyndiv to %1d on %4d\n",
new_bias, synth_freq);
/* swizzle rf_pwd_icsyndiv */
ath9k_phy_modify_rx_buffer(ah->analogBank6Data, tmp_reg, 3, 181, 3);
/* write Bank 6 with new params */
REG_WRITE_RF_ARRAY(&ah->iniBank6, ah->analogBank6Data, reg_writes);
}
/**
* ath9k_hw_set_channel - tune to a channel on the external AR2133/AR5133 radios
* @ah: atheros hardware stucture
@ -499,6 +564,9 @@ int ath9k_hw_set_channel(struct ath_hw *ah, struct ath9k_channel *chan)
return -EINVAL;
}
ath9k_hw_force_bias(ah, freq);
ath9k_hw_decrease_chain_power(ah, chan);
reg32 =
(channelSel << 8) | (aModeRefSel << 2) | (bModeSynth << 1) |
(1 << 5) | 0x1;
@ -946,6 +1014,8 @@ ath9k_hw_decrease_chain_power(struct ath_hw *ah, struct ath9k_channel *chan)
u32 bank6SelMask;
u32 *bank6Temp = ah->bank6Temp;
BUG_ON(AR_SREV_9280_10_OR_LATER(ah));
switch (ah->config.diversity_control) {
case ATH9K_ANT_FIXED_A:
bank6SelMask =