From f7317ba2d669c1b54fb31ed7834361a700a79217 Mon Sep 17 00:00:00 2001 From: Nick Kossifidis Date: Tue, 23 Nov 2010 20:50:16 +0200 Subject: [PATCH] ath5k: Use DCU early termination correctly * DCU early termination should be used to quickly flush QCU according to docs so don't enable it for all queues, enable it only when stopping each queue and disable it when we are done. Signed-off-by: Nick Kossifidis Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath5k/dma.c | 14 ++++++++++++++ drivers/net/wireless/ath/ath5k/qcu.c | 3 --- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/ath5k/dma.c b/drivers/net/wireless/ath/ath5k/dma.c index e39c953..bfdfcff 100644 --- a/drivers/net/wireless/ath/ath5k/dma.c +++ b/drivers/net/wireless/ath/ath5k/dma.c @@ -216,6 +216,14 @@ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue) ath5k_hw_reg_write(ah, tx_queue, AR5K_CR); ath5k_hw_reg_read(ah, AR5K_CR); } else { + + /* + * Enable DCU early termination to quickly + * flush any pending frames from QCU + */ + AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue), + AR5K_QCU_MISC_DCU_EARLY); + /* * Schedule TX disable and wait until queue is empty */ @@ -285,6 +293,12 @@ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue) queue); } + /* + * Disable DCU early termination + */ + AR5K_REG_DISABLE_BITS(ah, AR5K_QUEUE_MISC(queue), + AR5K_QCU_MISC_DCU_EARLY); + /* Clear register */ ath5k_hw_reg_write(ah, 0, AR5K_QCU_TXD); if (pending) { diff --git a/drivers/net/wireless/ath/ath5k/qcu.c b/drivers/net/wireless/ath/ath5k/qcu.c index 52eee34f..ed62273 100644 --- a/drivers/net/wireless/ath/ath5k/qcu.c +++ b/drivers/net/wireless/ath/ath5k/qcu.c @@ -340,9 +340,6 @@ int ath5k_hw_reset_tx_queue(struct ath5k_hw *ah, unsigned int queue) /* * Set misc registers */ - /* Enable DCU early termination for this queue */ - AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue), - AR5K_QCU_MISC_DCU_EARLY); /* Enable DCU to wait for next fragment from QCU */ AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue), -- 2.7.4