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ath9k_hw: calibrate PA input for PA predistortion

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Re-train if the calibrated PA linearization curve is out of bounds
(affects AR933x and AR9485).

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2012-08-27 17:00:05 +02:00 committed by John W. Linville
parent 2622895993
commit 381c726c09
3 changed files with 111 additions and 1 deletions
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99
drivers/net/wireless/ath/ath9k/ar9003_paprd.c
View File

@ -786,6 +786,102 @@ int ar9003_paprd_setup_gain_table(struct ath_hw *ah, int chain)
}
EXPORT_SYMBOL(ar9003_paprd_setup_gain_table);
static bool ar9003_paprd_retrain_pa_in(struct ath_hw *ah,
struct ath9k_hw_cal_data *caldata,
int chain)
{
u32 *pa_in = caldata->pa_table[chain];
int capdiv_offset, quick_drop_offset;
int capdiv2g, quick_drop;
int count = 0;
int i;
if (!AR_SREV_9485(ah) && !AR_SREV_9330(ah))
return false;
capdiv2g = REG_READ_FIELD(ah, AR_PHY_65NM_CH0_TXRF3,
AR_PHY_65NM_CH0_TXRF3_CAPDIV2G);
quick_drop = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP);
if (quick_drop)
quick_drop -= 0x40;
for (i = 0; i < NUM_BIN + 1; i++) {
if (pa_in[i] == 1400)
count++;
}
if (AR_SREV_9485(ah)) {
if (pa_in[23] < 800) {
capdiv_offset = (int)((1000 - pa_in[23] + 75) / 150);
capdiv2g += capdiv_offset;
if (capdiv2g > 7) {
capdiv2g = 7;
if (pa_in[23] < 600) {
quick_drop++;
if (quick_drop > 0)
quick_drop = 0;
}
}
} else if (pa_in[23] == 1400) {
quick_drop_offset = min_t(int, count / 3, 2);
quick_drop += quick_drop_offset;
capdiv2g += quick_drop_offset / 2;
if (capdiv2g > 7)
capdiv2g = 7;
if (quick_drop > 0) {
quick_drop = 0;
capdiv2g -= quick_drop_offset;
if (capdiv2g < 0)
capdiv2g = 0;
}
} else {
return false;
}
} else if (AR_SREV_9330(ah)) {
if (pa_in[23] < 1000) {
capdiv_offset = (1000 - pa_in[23]) / 100;
capdiv2g += capdiv_offset;
if (capdiv_offset > 3) {
capdiv_offset = 1;
quick_drop--;
}
capdiv2g += capdiv_offset;
if (capdiv2g > 6)
capdiv2g = 6;
if (quick_drop < -4)
quick_drop = -4;
} else if (pa_in[23] == 1400) {
if (count > 3) {
quick_drop++;
capdiv2g -= count / 4;
if (quick_drop > -2)
quick_drop = -2;
} else {
capdiv2g--;
}
if (capdiv2g < 0)
capdiv2g = 0;
} else {
return false;
}
}
REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_TXRF3,
AR_PHY_65NM_CH0_TXRF3_CAPDIV2G, capdiv2g);
REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
quick_drop);
return true;
}
int ar9003_paprd_create_curve(struct ath_hw *ah,
struct ath9k_hw_cal_data *caldata, int chain)
{
@ -821,6 +917,9 @@ int ar9003_paprd_create_curve(struct ath_hw *ah,
if (!create_pa_curve(data_L, data_U, pa_table, small_signal_gain))
status = -2;
if (ar9003_paprd_retrain_pa_in(ah, caldata, chain))
status = -EINPROGRESS;
REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);

4
drivers/net/wireless/ath/ath9k/ar9003_phy.h
View File

@ -625,6 +625,10 @@
#define AR_PHY_AIC_CTRL_4_B0 (AR_SM_BASE + 0x4c0)
#define AR_PHY_AIC_STAT_2_B0 (AR_SM_BASE + 0x4cc)
#define AR_PHY_65NM_CH0_TXRF3 0x16048
#define AR_PHY_65NM_CH0_TXRF3_CAPDIV2G 0x0000001e
#define AR_PHY_65NM_CH0_TXRF3_CAPDIV2G_S 1
#define AR_PHY_65NM_CH0_SYNTH4 0x1608c
#define AR_PHY_SYNTH4_LONG_SHIFT_SELECT (AR_SREV_9462(ah) ? 0x00000001 : 0x00000002)
#define AR_PHY_SYNTH4_LONG_SHIFT_SELECT_S (AR_SREV_9462(ah) ? 0 : 1)

9
drivers/net/wireless/ath/ath9k/link.c
View File

@ -254,6 +254,7 @@ void ath_paprd_calibrate(struct work_struct *work)
int chain_ok = 0;
int chain;
int len = 1800;
int ret;
if (!caldata)
return;
@ -302,7 +303,13 @@ void ath_paprd_calibrate(struct work_struct *work)
break;
}
if (ar9003_paprd_create_curve(ah, caldata, chain)) {
ret = ar9003_paprd_create_curve(ah, caldata, chain);
if (ret == -EINPROGRESS) {
ath_dbg(common, CALIBRATE,
"PAPRD curve on chain %d needs to be re-trained\n",
chain);
break;
} else if (ret) {
ath_dbg(common, CALIBRATE,
"PAPRD create curve failed on chain %d\n",
chain);