diff options
| author | Rajkumar Manoharan <rmanohar@qca.qualcomm.com> | 2012-06-11 12:19:32 +0530 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-06-13 14:35:53 -0400 |
| commit | 3863495b86d8ee8e7e70a328de5b88d555d7305a (patch) | |
| tree | 1d74ca3fbb7774bed9cee07c4162b1ef2e52459b /drivers/net/wireless/ath | |
| parent | 9dd9b0dc1de8031a31b3eaebc6a9c0ab60612026 (diff) | |
ath9k_hw: check GPM HW write pointer before chip reset
Both "MAC Warm Reset" and "MCI Reset Rx" will reset GPM HW write_ptr.
We should check software cached write_ptr against HW write_ptr before
reset. Otherwise the pending DMA data will be lost.
Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/ar9003_mci.c | 18 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/ar9003_mci.h | 1 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/hw.c | 3 |
3 files changed, 22 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mci.c b/drivers/net/wireless/ath/ath9k/ar9003_mci.c index 13907f63bdc0..cbeff9c4b5d8 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_mci.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_mci.c @@ -893,6 +893,9 @@ void ar9003_mci_reset(struct ath_hw *ah, bool en_int, bool is_2g, udelay(100); } + /* Check pending GPM msg before MCI Reset Rx */ + ar9003_mci_state(ah, MCI_STATE_CHECK_GPM_OFFSET, NULL); + regval |= SM(1, AR_MCI_COMMAND2_RESET_RX); REG_WRITE(ah, AR_MCI_COMMAND2, regval); udelay(1); @@ -1190,6 +1193,21 @@ u32 ar9003_mci_state(struct ath_hw *ah, u32 state_type, u32 *p_data) value = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR); mci->gpm_idx = value; break; + case MCI_STATE_CHECK_GPM_OFFSET: + /* + * This should only be called before "MAC Warm Reset" or + * "MCI Reset Rx". + */ + value = MS(REG_READ(ah, AR_MCI_GPM_1), AR_MCI_GPM_WRITE_PTR); + if (mci->gpm_idx == value) + break; + ath_dbg(common, MCI, + "GPM cached write pointer mismatch %d %d\n", + mci->gpm_idx, value); + mci->query_bt = true; + mci->need_flush_btinfo = true; + mci->gpm_idx = 0; + break; case MCI_STATE_NEXT_GPM_OFFSET: case MCI_STATE_LAST_GPM_OFFSET: /* diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mci.h b/drivers/net/wireless/ath/ath9k/ar9003_mci.h index 2a8c764281ba..45624e1d3960 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_mci.h +++ b/drivers/net/wireless/ath/ath9k/ar9003_mci.h @@ -190,6 +190,7 @@ enum mci_bt_state { enum mci_state_type { MCI_STATE_ENABLE, MCI_STATE_INIT_GPM_OFFSET, + MCI_STATE_CHECK_GPM_OFFSET, MCI_STATE_NEXT_GPM_OFFSET, MCI_STATE_LAST_GPM_OFFSET, MCI_STATE_BT, diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 6d893335f42b..8412128b842a 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1348,6 +1348,9 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type) } } + if (ath9k_hw_mci_is_enabled(ah)) + ar9003_mci_state(ah, MCI_STATE_CHECK_GPM_OFFSET, NULL); + REG_WRITE(ah, AR_RTC_RC, rst_flags); REGWRITE_BUFFER_FLUSH(ah); |