/**
* ath5k_ani_calibration() - The main ANI calibration function
* @ah: The &struct ath5k_hw
*
* We count OFDM and CCK errors relative to the time where we did not send or
* receive ("listen" time) and raise or lower immunity accordingly.
* This is called regularly (every second) from the calibration timer, but also
* when an error threshold has been reached.
*
* In order to synchronize access from different contexts, this should be
* called only indirectly by scheduling the ANI tasklet!
*/
void
ath5k_ani_calibration(struct ath5k_hw *ah)
{
struct ath5k_ani_state *as = &ah->ani_state;
int listen, ofdm_high, ofdm_low, cck_high, cck_low;
/* get listen time since last call and add it to the counter because we
* might not have restarted the "ani period" last time.
* always do this to calculate the busy time also in manual mode */
listen = ath5k_hw_ani_get_listen_time(ah, as);
as->listen_time += listen;
if (as->ani_mode != ATH5K_ANI_MODE_AUTO)
return;
ath5k_ani_save_and_clear_phy_errors(ah, as);
ofdm_high = as->listen_time * ATH5K_ANI_OFDM_TRIG_HIGH / 1000;
cck_high = as->listen_time * ATH5K_ANI_CCK_TRIG_HIGH / 1000;
ofdm_low = as->listen_time * ATH5K_ANI_OFDM_TRIG_LOW / 1000;
cck_low = as->listen_time * ATH5K_ANI_CCK_TRIG_LOW / 1000;
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"listen %d (now %d)", as->listen_time, listen);
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"check high ofdm %d/%d cck %d/%d",
as->ofdm_errors, ofdm_high, as->cck_errors, cck_high);
if (as->ofdm_errors > ofdm_high || as->cck_errors > cck_high) {
/* too many PHY errors - we have to raise immunity */
bool ofdm_flag = as->ofdm_errors > ofdm_high ? true : false;
ath5k_ani_raise_immunity(ah, as, ofdm_flag);
ath5k_ani_period_restart(as);
} else if (as->listen_time > 5 * ATH5K_ANI_LISTEN_PERIOD) {
/* If more than 5 (TODO: why 5?) periods have passed and we got
* relatively little errors we can try to lower immunity */
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"check low ofdm %d/%d cck %d/%d",
as->ofdm_errors, ofdm_low, as->cck_errors, cck_low);
if (as->ofdm_errors <= ofdm_low && as->cck_errors <= cck_low)
ath5k_ani_lower_immunity(ah, as);
ath5k_ani_period_restart(as);
}
}
void
ath5k_ani_calibration(struct ath5k_hw *ah)
{
struct ath5k_ani_state *as = &ah->ani_state;
int listen, ofdm_high, ofdm_low, cck_high, cck_low;
listen = ath5k_hw_ani_get_listen_time(ah, as);
as->listen_time += listen;
if (as->ani_mode != ATH5K_ANI_MODE_AUTO)
return;
ath5k_ani_save_and_clear_phy_errors(ah, as);
ofdm_high = as->listen_time * ATH5K_ANI_OFDM_TRIG_HIGH / 1000;
cck_high = as->listen_time * ATH5K_ANI_CCK_TRIG_HIGH / 1000;
ofdm_low = as->listen_time * ATH5K_ANI_OFDM_TRIG_LOW / 1000;
cck_low = as->listen_time * ATH5K_ANI_CCK_TRIG_LOW / 1000;
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"listen %d (now %d)", as->listen_time, listen);
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"check high ofdm %d/%d cck %d/%d",
as->ofdm_errors, ofdm_high, as->cck_errors, cck_high);
if (as->ofdm_errors > ofdm_high || as->cck_errors > cck_high) {
bool ofdm_flag = as->ofdm_errors > ofdm_high ? true : false;
ath5k_ani_raise_immunity(ah, as, ofdm_flag);
ath5k_ani_period_restart(as);
} else if (as->listen_time > 5 * ATH5K_ANI_LISTEN_PERIOD) {
ATH5K_DBG_UNLIMIT(ah, ATH5K_DEBUG_ANI,
"check low ofdm %d/%d cck %d/%d",
as->ofdm_errors, ofdm_low, as->cck_errors, cck_low);
if (as->ofdm_errors <= ofdm_low && as->cck_errors <= cck_low)
ath5k_ani_lower_immunity(ah, as);
ath5k_ani_period_restart(as);
}
}