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Implement a bit of a hack to store the AR9285/AR9485 RX LNA configuration in

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the RX antenna field.

The AR9285/AR9485 use an LNA mixer to determine how to combine the signals
from the two antennas.  This is encoded in the RSSI fields (ctl/ext) for
chain 2.  So, let's use that here.

This maps RX antennas 0->3 to the RX mixer configuration used to
receive a frame.  There's more that can be done but this is good enough
to diagnose if the hardware is doing "odd" things like trying to
receive frames on LNA2 (ie, antenna 2 or "alt" antenna) when there's
only one antenna connected.

Tested:

* AR9285, STA mode
This commit is contained in:
Adrian Chadd 2013-06-05 00:45:19 +00:00
parent d98a3d6936
commit 3df7a8ab08
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251401
3 changed files with 33 additions and 2 deletions
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1
sys/dev/ath/if_ath.c
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@ -670,6 +670,7 @@ ath_attach(u_int16_t devid, struct ath_softc *sc)
sc->sc_rxslink = ath_hal_self_linked_final_rxdesc(ah);
sc->sc_rxtsf32 = ath_hal_has_long_rxdesc_tsf(ah);
sc->sc_hasenforcetxop = ath_hal_hasenforcetxop(ah);
sc->sc_rx_lnamixer = ath_hal_hasrxlnamixer(ah);
if (ath_hal_hasfastframes(ah))
ic->ic_caps |= IEEE80211_C_FF;
wmodes = ath_hal_getwirelessmodes(ah);

28
sys/dev/ath/if_ath_rx.c
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@ -704,6 +704,34 @@ ath_rx_pkt(struct ath_softc *sc, struct ath_rx_status *rs, HAL_STATUS status,
rs->rs_antenna = 0; /* XXX better than nothing */
}
/*
* If this is an AR9285/AR9485, then the receive and LNA
* configuration is stored in RSSI[2] / EXTRSSI[2].
* We can extract this out to build a much better
* receive antenna profile.
*
* Yes, this just blurts over the above RX antenna field
* for now. It's fine, the AR9285 doesn't really use
* that.
*
* Later on we should store away the fine grained LNA
* information and keep separate counters just for
* that. It'll help when debugging the AR9285/AR9485
* combined diversity code.
*/
if (sc->sc_rx_lnamixer) {
rs->rs_antenna = 0;
/* Bits 0:1 - the LNA configuration used */
rs->rs_antenna |=
((rs->rs_rssi_ctl[2] & HAL_RX_LNA_CFG_USED)
>> HAL_RX_LNA_CFG_USED_S);
/* Bit 2 - the external RX antenna switch */
if (rs->rs_rssi_ctl[2] & HAL_RX_LNA_EXTCFG)
rs->rs_antenna |= 0x4;
}
ifp->if_ipackets++;
sc->sc_stats.ast_ant_rx[rs->rs_antenna]++;

6
sys/dev/ath/if_athvar.h
View File

@ -629,8 +629,8 @@ struct ath_softc {
u_int32_t sc_use_ent : 1,
sc_rx_stbc : 1,
sc_tx_stbc : 1,
sc_hasenforcetxop : 1; /* support enforce TxOP */
sc_hasenforcetxop : 1, /* support enforce TxOP */
sc_rx_lnamixer : 1; /* RX using LNA mixing */
int sc_cabq_enable; /* Enable cabq transmission */
@ -1269,6 +1269,8 @@ void ath_intr(void *);
#define ath_hal_setenforcetxop(_ah, _v) \
ath_hal_setcapability(_ah, HAL_CAP_ENFORCE_TXOP, 1, _v, NULL)
#define ath_hal_hasrxlnamixer(_ah) \
(ath_hal_getcapability(_ah, HAL_CAP_RX_LNA_MIXING, 0, NULL) == HAL_OK)
/* EDMA definitions */
#define ath_hal_hasedma(_ah) \