diff options
| author | Nick Kossifidis <mick@madwifi.org> | 2008-09-29 01:23:07 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-09-30 14:07:26 -0400 |
| commit | 509a106e68aa42acc1a0c44ab365d0de6869bd9e (patch) | |
| tree | 2477b692d65bec9489f4db281b8ddcb7d0018a71 /drivers/net/wireless/ath5k/dma.c | |
| parent | ee81c5544bbf49ea5b301784a605d865947ac1b0 (diff) | |
ath5k: Use QUIET mechanism on tx dma stop
* Use QUIET mechanism to drain tx buffer on PCU for newer chips
* Make sure that INTPEND is really 1 and not 0xffffffff while checking for pending interrupts
Changes-Licensed-under: ISC
Signed-Off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath5k/dma.c')
| -rw-r--r-- | drivers/net/wireless/ath5k/dma.c | 49 |
1 files changed, 44 insertions, 5 deletions
diff --git a/drivers/net/wireless/ath5k/dma.c b/drivers/net/wireless/ath5k/dma.c index a28090be960..7adceb2c7fa 100644 --- a/drivers/net/wireless/ath5k/dma.c +++ b/drivers/net/wireless/ath5k/dma.c @@ -68,7 +68,7 @@ int ath5k_hw_stop_rx_dma(struct ath5k_hw *ah) /* * It may take some time to disable the DMA receive unit */ - for (i = 2000; i > 0 && + for (i = 1000; i > 0 && (ath5k_hw_reg_read(ah, AR5K_CR) & AR5K_CR_RXE) != 0; i--) udelay(10); @@ -182,11 +182,10 @@ int ath5k_hw_start_tx_dma(struct ath5k_hw *ah, unsigned int queue) * have any pending frames. Returns -EBUSY if we still have pending frames, * -EINVAL if queue number is out of range. * - * TODO: Test queue drain code */ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue) { - unsigned int i = 100; + unsigned int i = 40; u32 tx_queue, pending; ATH5K_TRACE(ah->ah_sc); @@ -233,13 +232,53 @@ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue) udelay(100); } while (--i && pending); + /* For 2413+ order PCU to drop packets using + * QUIET mechanism */ + if (ah->ah_mac_version >= (AR5K_SREV_AR2414 >> 4) && + pending){ + /* Set periodicity and duration */ + ath5k_hw_reg_write(ah, + AR5K_REG_SM(100, AR5K_QUIET_CTL2_QT_PER)| + AR5K_REG_SM(10, AR5K_QUIET_CTL2_QT_DUR), + AR5K_QUIET_CTL2); + + /* Enable quiet period for current TSF */ + ath5k_hw_reg_write(ah, + AR5K_QUIET_CTL1_QT_EN | + AR5K_REG_SM(ath5k_hw_reg_read(ah, + AR5K_TSF_L32_5211) >> 10, + AR5K_QUIET_CTL1_NEXT_QT_TSF), + AR5K_QUIET_CTL1); + + /* Force channel idle high */ + AR5K_REG_ENABLE_BITS(ah, AR5K_DIAG_SW_5211, + AR5K_DIAG_SW_CHANEL_IDLE_HIGH); + + /* Wait a while and disable mechanism */ + udelay(200); + AR5K_REG_DISABLE_BITS(ah, AR5K_QUIET_CTL1, + AR5K_QUIET_CTL1_QT_EN); + + /* Re-check for pending frames */ + i = 40; + do { + pending = ath5k_hw_reg_read(ah, + AR5K_QUEUE_STATUS(queue)) & + AR5K_QCU_STS_FRMPENDCNT; + udelay(100); + } while (--i && pending); + + AR5K_REG_DISABLE_BITS(ah, AR5K_DIAG_SW_5211, + AR5K_DIAG_SW_CHANEL_IDLE_HIGH); + } + /* Clear register */ ath5k_hw_reg_write(ah, 0, AR5K_QCU_TXD); if (pending) return -EBUSY; } - /* TODO: Check for success else return error */ + /* TODO: Check for success on 5210 else return error */ return 0; } @@ -415,7 +454,7 @@ done: bool ath5k_hw_is_intr_pending(struct ath5k_hw *ah) { ATH5K_TRACE(ah->ah_sc); - return ath5k_hw_reg_read(ah, AR5K_INTPEND); + return ath5k_hw_reg_read(ah, AR5K_INTPEND) == 1 ? 1 : 0; } /** |