ath5k: use noise calibration from madwifi hal
This updates ath5k to calibrate the noise floor similar to the way it is done in the madwifi hal and ath9k. Of note: - we start NF measurement at the same time as AGC calibration, but do not actually read the value until the periodic (long) calibration - we keep a history of the last few values read and write the median back to the hardware for CCA - we do not complain if NF calibration isn't complete, instead we keep the last read value. Signed-off-by: Bob Copeland <me@bobcopeland.com> Acked-by: Nick Kossifidis <mickflemm@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bob Copeland
John W. Linville
parent
e307fcf0a1
commit
e5e2647fd6
@ -198,6 +198,7 @@
|
||||
#define AR5K_TUNE_CWMAX_11B 1023
|
||||
#define AR5K_TUNE_CWMAX_XR 7
|
||||
#define AR5K_TUNE_NOISE_FLOOR -72
|
||||
#define AR5K_TUNE_CCA_MAX_GOOD_VALUE -95
|
||||
#define AR5K_TUNE_MAX_TXPOWER 63
|
||||
#define AR5K_TUNE_DEFAULT_TXPOWER 25
|
||||
#define AR5K_TUNE_TPC_TXPOWER false
|
||||
@ -1006,6 +1007,14 @@ struct ath5k_capabilities {
|
||||
} cap_queues;
|
||||
};
|
||||
|
||||
/* size of noise floor history (keep it a power of two) */
|
||||
#define ATH5K_NF_CAL_HIST_MAX 8
|
||||
struct ath5k_nfcal_hist
|
||||
{
|
||||
s16 index; /* current index into nfval */
|
||||
s16 nfval[ATH5K_NF_CAL_HIST_MAX]; /* last few noise floors */
|
||||
};
|
||||
|
||||
|
||||
/***************************************\
|
||||
HARDWARE ABSTRACTION LAYER STRUCTURE
|
||||
@ -1112,6 +1121,8 @@ struct ath5k_hw {
|
||||
struct ieee80211_channel r_last_channel;
|
||||
} ah_radar;
|
||||
|
||||
struct ath5k_nfcal_hist ah_nfcal_hist;
|
||||
|
||||
/* noise floor from last periodic calibration */
|
||||
s32 ah_noise_floor;
|
||||
|
||||
@ -1274,8 +1285,10 @@ extern int ath5k_hw_rfgain_opt_init(struct ath5k_hw *ah);
|
||||
extern bool ath5k_channel_ok(struct ath5k_hw *ah, u16 freq, unsigned int flags);
|
||||
extern int ath5k_hw_channel(struct ath5k_hw *ah, struct ieee80211_channel *channel);
|
||||
/* PHY calibration */
|
||||
void ath5k_hw_init_nfcal_hist(struct ath5k_hw *ah);
|
||||
extern int ath5k_hw_phy_calibrate(struct ath5k_hw *ah, struct ieee80211_channel *channel);
|
||||
extern int ath5k_hw_noise_floor_calibration(struct ath5k_hw *ah, short freq);
|
||||
extern s16 ath5k_hw_get_noise_floor(struct ath5k_hw *ah);
|
||||
extern void ath5k_hw_calibration_poll(struct ath5k_hw *ah);
|
||||
/* Spur mitigation */
|
||||
bool ath5k_hw_chan_has_spur_noise(struct ath5k_hw *ah,
|
||||
|
||||
@ -331,6 +331,8 @@ int ath5k_hw_attach(struct ath5k_softc *sc)
|
||||
|
||||
ath5k_hw_rfgain_opt_init(ah);
|
||||
|
||||
ath5k_hw_init_nfcal_hist(ah);
|
||||
|
||||
/* turn on HW LEDs */
|
||||
ath5k_hw_set_ledstate(ah, AR5K_LED_INIT);
|
||||
|
||||
|
||||
@ -1124,77 +1124,148 @@ ath5k_hw_calibration_poll(struct ath5k_hw *ah)
|
||||
ah->ah_swi_mask = AR5K_SWI_FULL_CALIBRATION;
|
||||
AR5K_REG_ENABLE_BITS(ah, AR5K_CR, AR5K_CR_SWI);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* ath5k_hw_noise_floor_calibration - perform PHY noise floor calibration
|
||||
*
|
||||
* @ah: struct ath5k_hw pointer we are operating on
|
||||
* @freq: the channel frequency, just used for error logging
|
||||
*
|
||||
* This function performs a noise floor calibration of the PHY and waits for
|
||||
* it to complete. Then the noise floor value is compared to some maximum
|
||||
* noise floor we consider valid.
|
||||
*
|
||||
* Note that this is different from what the madwifi HAL does: it reads the
|
||||
* noise floor and afterwards initiates the calibration. Since the noise floor
|
||||
* calibration can take some time to finish, depending on the current channel
|
||||
* use, that avoids the occasional timeout warnings we are seeing now.
|
||||
*
|
||||
* See the following link for an Atheros patent on noise floor calibration:
|
||||
* http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL \
|
||||
* &p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7245893.PN.&OS=PN/7
|
||||
*
|
||||
* XXX: Since during noise floor calibration antennas are detached according to
|
||||
* the patent, we should stop tx queues here.
|
||||
*/
|
||||
int
|
||||
ath5k_hw_noise_floor_calibration(struct ath5k_hw *ah, short freq)
|
||||
static int sign_extend(int val, const int nbits)
|
||||
{
|
||||
int ret;
|
||||
unsigned int i;
|
||||
s32 noise_floor;
|
||||
int order = BIT(nbits-1);
|
||||
return (val ^ order) - order;
|
||||
}
|
||||
|
||||
/*
|
||||
* Enable noise floor calibration
|
||||
*/
|
||||
AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGCCTL,
|
||||
AR5K_PHY_AGCCTL_NF);
|
||||
static s32 ath5k_hw_read_measured_noise_floor(struct ath5k_hw *ah)
|
||||
{
|
||||
s32 val;
|
||||
|
||||
ret = ath5k_hw_register_timeout(ah, AR5K_PHY_AGCCTL,
|
||||
AR5K_PHY_AGCCTL_NF, 0, false);
|
||||
if (ret) {
|
||||
ATH5K_ERR(ah->ah_sc,
|
||||
"noise floor calibration timeout (%uMHz)\n", freq);
|
||||
return -EAGAIN;
|
||||
}
|
||||
val = ath5k_hw_reg_read(ah, AR5K_PHY_NF);
|
||||
return sign_extend(AR5K_REG_MS(val, AR5K_PHY_NF_MINCCA_PWR), 9);
|
||||
}
|
||||
|
||||
/* Wait until the noise floor is calibrated and read the value */
|
||||
for (i = 20; i > 0; i--) {
|
||||
mdelay(1);
|
||||
noise_floor = ath5k_hw_reg_read(ah, AR5K_PHY_NF);
|
||||
noise_floor = AR5K_PHY_NF_RVAL(noise_floor);
|
||||
if (noise_floor & AR5K_PHY_NF_ACTIVE) {
|
||||
noise_floor = AR5K_PHY_NF_AVAL(noise_floor);
|
||||
void ath5k_hw_init_nfcal_hist(struct ath5k_hw *ah)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (noise_floor <= AR5K_TUNE_NOISE_FLOOR)
|
||||
break;
|
||||
ah->ah_nfcal_hist.index = 0;
|
||||
for (i = 0; i < ATH5K_NF_CAL_HIST_MAX; i++)
|
||||
ah->ah_nfcal_hist.nfval[i] = AR5K_TUNE_CCA_MAX_GOOD_VALUE;
|
||||
}
|
||||
|
||||
static void ath5k_hw_update_nfcal_hist(struct ath5k_hw *ah, s16 noise_floor)
|
||||
{
|
||||
struct ath5k_nfcal_hist *hist = &ah->ah_nfcal_hist;
|
||||
hist->index = (hist->index + 1) & (ATH5K_NF_CAL_HIST_MAX-1);
|
||||
hist->nfval[hist->index] = noise_floor;
|
||||
}
|
||||
|
||||
static s16 ath5k_hw_get_median_noise_floor(struct ath5k_hw *ah)
|
||||
{
|
||||
s16 sort[ATH5K_NF_CAL_HIST_MAX];
|
||||
s16 tmp;
|
||||
int i, j;
|
||||
|
||||
memcpy(sort, ah->ah_nfcal_hist.nfval, sizeof(sort));
|
||||
for (i = 0; i < ATH5K_NF_CAL_HIST_MAX - 1; i++) {
|
||||
for (j = 1; j < ATH5K_NF_CAL_HIST_MAX - i; j++) {
|
||||
if (sort[j] > sort[j-1]) {
|
||||
tmp = sort[j];
|
||||
sort[j] = sort[j-1];
|
||||
sort[j-1] = tmp;
|
||||
}
|
||||
}
|
||||
}
|
||||
for (i = 0; i < ATH5K_NF_CAL_HIST_MAX; i++) {
|
||||
ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
|
||||
"cal %d:%d\n", i, sort[i]);
|
||||
}
|
||||
return sort[(ATH5K_NF_CAL_HIST_MAX-1) / 2];
|
||||
}
|
||||
|
||||
ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
|
||||
"noise floor %d\n", noise_floor);
|
||||
/*
|
||||
* When we tell the hardware to perform a noise floor calibration
|
||||
* by setting the AR5K_PHY_AGCCTL_NF bit, it will periodically
|
||||
* sample-and-hold the minimum noise level seen at the antennas.
|
||||
* This value is then stored in a ring buffer of recently measured
|
||||
* noise floor values so we have a moving window of the last few
|
||||
* samples.
|
||||
*
|
||||
* The median of the values in the history is then loaded into the
|
||||
* hardware for its own use for RSSI and CCA measurements.
|
||||
*/
|
||||
void ath5k_hw_update_noise_floor(struct ath5k_hw *ah)
|
||||
{
|
||||
struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
|
||||
u32 val;
|
||||
s16 nf, threshold;
|
||||
u8 ee_mode;
|
||||
|
||||
if (noise_floor > AR5K_TUNE_NOISE_FLOOR) {
|
||||
ATH5K_ERR(ah->ah_sc,
|
||||
"noise floor calibration failed (%uMHz)\n", freq);
|
||||
return -EAGAIN;
|
||||
/* keep last value if calibration hasn't completed */
|
||||
if (ath5k_hw_reg_read(ah, AR5K_PHY_AGCCTL) & AR5K_PHY_AGCCTL_NF) {
|
||||
ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
|
||||
"NF did not complete in calibration window\n");
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
ah->ah_noise_floor = noise_floor;
|
||||
switch (ah->ah_current_channel->hw_value & CHANNEL_MODES) {
|
||||
case CHANNEL_A:
|
||||
case CHANNEL_T:
|
||||
case CHANNEL_XR:
|
||||
ee_mode = AR5K_EEPROM_MODE_11A;
|
||||
break;
|
||||
case CHANNEL_G:
|
||||
case CHANNEL_TG:
|
||||
ee_mode = AR5K_EEPROM_MODE_11G;
|
||||
break;
|
||||
default:
|
||||
case CHANNEL_B:
|
||||
ee_mode = AR5K_EEPROM_MODE_11B;
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
/* completed NF calibration, test threshold */
|
||||
nf = ath5k_hw_read_measured_noise_floor(ah);
|
||||
threshold = ee->ee_noise_floor_thr[ee_mode];
|
||||
|
||||
if (nf > threshold) {
|
||||
ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
|
||||
"noise floor failure detected; "
|
||||
"read %d, threshold %d\n",
|
||||
nf, threshold);
|
||||
|
||||
nf = AR5K_TUNE_CCA_MAX_GOOD_VALUE;
|
||||
}
|
||||
|
||||
ath5k_hw_update_nfcal_hist(ah, nf);
|
||||
nf = ath5k_hw_get_median_noise_floor(ah);
|
||||
|
||||
/* load noise floor (in .5 dBm) so the hardware will use it */
|
||||
val = ath5k_hw_reg_read(ah, AR5K_PHY_NF) & ~AR5K_PHY_NF_M;
|
||||
val |= (nf * 2) & AR5K_PHY_NF_M;
|
||||
ath5k_hw_reg_write(ah, val, AR5K_PHY_NF);
|
||||
|
||||
AR5K_REG_MASKED_BITS(ah, AR5K_PHY_AGCCTL, AR5K_PHY_AGCCTL_NF,
|
||||
~(AR5K_PHY_AGCCTL_NF_EN | AR5K_PHY_AGCCTL_NF_NOUPDATE));
|
||||
|
||||
ath5k_hw_register_timeout(ah, AR5K_PHY_AGCCTL, AR5K_PHY_AGCCTL_NF,
|
||||
0, false);
|
||||
|
||||
/*
|
||||
* Load a high max CCA Power value (-50 dBm in .5 dBm units)
|
||||
* so that we're not capped by the median we just loaded.
|
||||
* This will be used as the initial value for the next noise
|
||||
* floor calibration.
|
||||
*/
|
||||
val = (val & ~AR5K_PHY_NF_M) | ((-50 * 2) & AR5K_PHY_NF_M);
|
||||
ath5k_hw_reg_write(ah, val, AR5K_PHY_NF);
|
||||
AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGCCTL,
|
||||
AR5K_PHY_AGCCTL_NF_EN |
|
||||
AR5K_PHY_AGCCTL_NF_NOUPDATE |
|
||||
AR5K_PHY_AGCCTL_NF);
|
||||
|
||||
ah->ah_noise_floor = nf;
|
||||
|
||||
ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_CALIBRATE,
|
||||
"noise floor calibrated: %d\n", nf);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1287,7 +1358,7 @@ static int ath5k_hw_rf5110_calibrate(struct ath5k_hw *ah,
|
||||
return ret;
|
||||
}
|
||||
|
||||
ath5k_hw_noise_floor_calibration(ah, channel->center_freq);
|
||||
ath5k_hw_update_noise_floor(ah);
|
||||
|
||||
/*
|
||||
* Re-enable RX/TX and beacons
|
||||
@ -1360,7 +1431,7 @@ done:
|
||||
* since noise floor calibration interrupts rx path while I/Q
|
||||
* calibration doesn't. We don't need to run noise floor calibration
|
||||
* as often as I/Q calibration.*/
|
||||
ath5k_hw_noise_floor_calibration(ah, channel->center_freq);
|
||||
ath5k_hw_update_noise_floor(ah);
|
||||
|
||||
/* Initiate a gain_F calibration */
|
||||
ath5k_hw_request_rfgain_probe(ah);
|
||||
|
||||
@ -2033,17 +2033,14 @@
|
||||
#define AR5K_PHY_AGCCTL_NF_NOUPDATE 0x00020000 /* Don't update nf automaticaly */
|
||||
|
||||
/*
|
||||
* PHY noise floor status register
|
||||
* PHY noise floor status register (CCA = Clear Channel Assessment)
|
||||
*/
|
||||
#define AR5K_PHY_NF 0x9864 /* Register address */
|
||||
#define AR5K_PHY_NF_M 0x000001ff /* Noise floor mask */
|
||||
#define AR5K_PHY_NF_ACTIVE 0x00000100 /* Noise floor calibration still active */
|
||||
#define AR5K_PHY_NF_RVAL(_n) (((_n) >> 19) & AR5K_PHY_NF_M)
|
||||
#define AR5K_PHY_NF_AVAL(_n) (-((_n) ^ AR5K_PHY_NF_M) + 1)
|
||||
#define AR5K_PHY_NF_SVAL(_n) (((_n) & AR5K_PHY_NF_M) | (1 << 9))
|
||||
#define AR5K_PHY_NF_M 0x000001ff /* Noise floor, written to hardware in 1/2 dBm units */
|
||||
#define AR5K_PHY_NF_SVAL(_n) (((_n) & AR5K_PHY_NF_M) | (1 << 9))
|
||||
#define AR5K_PHY_NF_THRESH62 0x0007f000 /* Thresh62 -check ANI patent- (field) */
|
||||
#define AR5K_PHY_NF_THRESH62_S 12
|
||||
#define AR5K_PHY_NF_MINCCA_PWR 0x0ff80000 /* ??? */
|
||||
#define AR5K_PHY_NF_MINCCA_PWR 0x0ff80000 /* Minimum measured noise level, read from hardware in 1 dBm units */
|
||||
#define AR5K_PHY_NF_MINCCA_PWR_S 19
|
||||
|
||||
/*
|
||||
|
||||
@ -1293,7 +1293,7 @@ int ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
|
||||
* out and/or noise floor calibration might timeout.
|
||||
*/
|
||||
AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_AGCCTL,
|
||||
AR5K_PHY_AGCCTL_CAL);
|
||||
AR5K_PHY_AGCCTL_CAL | AR5K_PHY_AGCCTL_NF);
|
||||
|
||||
/* At the same time start I/Q calibration for QAM constellation
|
||||
* -no need for CCK- */
|
||||
@ -1314,21 +1314,6 @@ int ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
|
||||
channel->center_freq);
|
||||
}
|
||||
|
||||
/*
|
||||
* If we run NF calibration before AGC, it always times out.
|
||||
* Binary HAL starts NF and AGC calibration at the same time
|
||||
* and only waits for AGC to finish. Also if AGC or NF cal.
|
||||
* times out, reset doesn't fail on binary HAL. I believe
|
||||
* that's wrong because since rx path is routed to a detector,
|
||||
* if cal. doesn't finish we won't have RX. Sam's HAL for AR5210/5211
|
||||
* enables noise floor calibration after offset calibration and if noise
|
||||
* floor calibration fails, reset fails. I believe that's
|
||||
* a better approach, we just need to find a polling interval
|
||||
* that suits best, even if reset continues we need to make
|
||||
* sure that rx path is ready.
|
||||
*/
|
||||
ath5k_hw_noise_floor_calibration(ah, channel->center_freq);
|
||||
|
||||
/* Restore antenna mode */
|
||||
ath5k_hw_set_antenna_mode(ah, ah->ah_ant_mode);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user