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ath9k: Fix a PLL hang issue observed with AR9485.

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When this PLL hang issue is seen, both Rx and Tx fail to work.
The sqsum_dvc needs to be below 2000 for a good chip. During
this issue the sqsum_dvc value is beyond 80000 and only a
full reset can solve this problem.

Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vivek Natarajan
2011-01-27 14:45:08 +05:30
committed by John W. Linville
parent b141581923
commit 181fb18daa
3 changed files with 27 additions and 0 deletions
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23
drivers/net/wireless/ath/ath9k/xmit.c
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@@ -2091,6 +2091,28 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
}
}
static void ath_hw_pll_work(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc,
hw_pll_work.work);
static int count;
if (AR_SREV_9485(sc->sc_ah)) {
if (ar9003_get_pll_sqsum_dvc(sc->sc_ah) >= 0x40000) {
count++;
if (count == 3) {
/* Rx is hung for more than 500ms. Reset it */
ath_reset(sc, true);
count = 0;
}
} else
count = 0;
ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/5);
}
}
static void ath_tx_complete_poll_work(struct work_struct *work)
{
struct ath_softc *sc = container_of(work, struct ath_softc,
@@ -2312,6 +2334,7 @@ int ath_tx_init(struct ath_softc *sc, int nbufs)
}
INIT_DELAYED_WORK(&sc->tx_complete_work, ath_tx_complete_poll_work);
INIT_DELAYED_WORK(&sc->hw_pll_work, ath_hw_pll_work);
if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
error = ath_tx_edma_init(sc);