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brcmsmac: change lcnphy receive i/q calibration routine

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The gain level control for the test tone has been changed. This
calbration test tone is used to determine the i/q compensation.
The i/q calibration routine has been reworked to accomodate this.

Cc: Jonas Gorski <jogo@openwrt.org>
Tested-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Arend van Spriel 2013-08-20 16:00:40 +02:00 committed by John W. Linville
parent ab9a50e387
commit 7de646854b
1 changed files with 57 additions and 19 deletions
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76
drivers/net/wireless/brcm80211/brcmsmac/phy/phy_lcn.c
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@ -1329,6 +1329,43 @@ static u32 wlc_lcnphy_measure_digital_power(struct brcms_phy *pi, u16 nsamples)
return (iq_est.i_pwr + iq_est.q_pwr) / nsamples;
}
static bool wlc_lcnphy_rx_iq_cal_gain(struct brcms_phy *pi, u16 biq1_gain,
u16 tia_gain, u16 lna2_gain)
{
u32 i_thresh_l, q_thresh_l;
u32 i_thresh_h, q_thresh_h;
struct lcnphy_iq_est iq_est_h, iq_est_l;
wlc_lcnphy_set_rx_gain_by_distribution(pi, 0, 0, 0, biq1_gain, tia_gain,
lna2_gain, 0);
wlc_lcnphy_rx_gain_override_enable(pi, true);
wlc_lcnphy_start_tx_tone(pi, 2000, (40 >> 1), 0);
udelay(500);
write_radio_reg(pi, RADIO_2064_REG112, 0);
if (!wlc_lcnphy_rx_iq_est(pi, 1024, 32, &iq_est_l))
return false;
wlc_lcnphy_start_tx_tone(pi, 2000, 40, 0);
udelay(500);
write_radio_reg(pi, RADIO_2064_REG112, 0);
if (!wlc_lcnphy_rx_iq_est(pi, 1024, 32, &iq_est_h))
return false;
i_thresh_l = (iq_est_l.i_pwr << 1);
i_thresh_h = (iq_est_l.i_pwr << 2) + iq_est_l.i_pwr;
q_thresh_l = (iq_est_l.q_pwr << 1);
q_thresh_h = (iq_est_l.q_pwr << 2) + iq_est_l.q_pwr;
if ((iq_est_h.i_pwr > i_thresh_l) &&
(iq_est_h.i_pwr < i_thresh_h) &&
(iq_est_h.q_pwr > q_thresh_l) &&
(iq_est_h.q_pwr < q_thresh_h))
return true;
return false;
}
static bool
wlc_lcnphy_rx_iq_cal(struct brcms_phy *pi,
const struct lcnphy_rx_iqcomp *iqcomp,
@ -1343,8 +1380,8 @@ wlc_lcnphy_rx_iq_cal(struct brcms_phy *pi,
RFOverrideVal0_old, rfoverride2_old, rfoverride2val_old,
rfoverride3_old, rfoverride3val_old, rfoverride4_old,
rfoverride4val_old, afectrlovr_old, afectrlovrval_old;
int tia_gain;
u32 received_power, rx_pwr_threshold;
int tia_gain, lna2_gain, biq1_gain;
bool set_gain;
u16 old_sslpnCalibClkEnCtrl, old_sslpnRxFeClkEnCtrl;
u16 values_to_save[11];
s16 *ptr;
@ -1432,29 +1469,30 @@ wlc_lcnphy_rx_iq_cal(struct brcms_phy *pi,
mod_phy_reg(pi, 0x43b, (0x1 << 0), 1 << 0);
mod_phy_reg(pi, 0x43c, (0x1 << 0), 0 << 0);
wlc_lcnphy_start_tx_tone(pi, 2000, 120, 0);
write_phy_reg(pi, 0x6da, 0xffff);
or_phy_reg(pi, 0x6db, 0x3);
wlc_lcnphy_set_trsw_override(pi, tx_switch, rx_switch);
wlc_lcnphy_rx_gain_override_enable(pi, true);
for (lna2_gain = 3; lna2_gain >= 0; lna2_gain--) {
for (tia_gain = 4; tia_gain >= 0; tia_gain--) {
for (biq1_gain = 6; biq1_gain >= 0; biq1_gain--) {
set_gain = wlc_lcnphy_rx_iq_cal_gain(pi,
(u16)
biq1_gain,
(u16)
tia_gain,
(u16)
lna2_gain);
if (!set_gain)
continue;
tia_gain = 8;
rx_pwr_threshold = 950;
while (tia_gain > 0) {
tia_gain -= 1;
wlc_lcnphy_set_rx_gain_by_distribution(pi,
0, 0, 2, 2,
(u16)
tia_gain, 1, 0);
udelay(500);
received_power =
wlc_lcnphy_measure_digital_power(pi, 2000);
if (received_power < rx_pwr_threshold)
break;
result = wlc_lcnphy_calc_rx_iq_comp(pi, 1024);
goto stop_tone;
}
}
}
result = wlc_lcnphy_calc_rx_iq_comp(pi, 0xffff);
stop_tone:
wlc_lcnphy_stop_tx_tone(pi);
write_phy_reg(pi, 0x631, Core1TxControl_old);