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dma: do not check the DMA_DONE bit for tx, use the dma index register instead

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Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2015-06-13 09:26:41 +02:00
parent a971d9f287
commit 5ed83c47b4
1 changed files with 27 additions and 5 deletions
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dma.c
+27 -5
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@@ -20,6 +20,12 @@ struct mt76_txwi_cache {
struct list_head list;
};
enum mt76_dma_dequeue {
DMA_DEQUEUE_FLUSH,
DMA_DEQUEUE_DDONE,
DMA_DEQUEUE_IDX,
};
static inline int
mt76_rx_buf_offset(struct mt76_dev *dev)
{
@@ -261,16 +267,31 @@ free:
}
static int
mt76_dma_dequeue(struct mt76_dev *dev, struct mt76_queue *q, bool flush)
mt76_dma_dequeue(struct mt76_dev *dev, struct mt76_queue *q, enum mt76_dma_dequeue type)
{
int ret = -1;
u16 idx;
bool skip;
spin_lock_bh(&q->lock);
if (!q->queued)
goto out;
if (!flush && !(q->desc[q->tail].ctrl & cpu_to_le32(MT_DMA_CTL_DMA_DONE)))
switch (type) {
case DMA_DEQUEUE_DDONE:
skip = !(q->desc[q->tail].ctrl & cpu_to_le32(MT_DMA_CTL_DMA_DONE));
break;
case DMA_DEQUEUE_IDX:
idx = ioread32(&q->regs->dma_idx);
skip = (q->tail == idx);
break;
case DMA_DEQUEUE_FLUSH:
skip = false;
break;
}
if (skip)
goto out;
ret = q->tail;
@@ -321,10 +342,11 @@ mt76_tx_cleanup_entry(struct mt76_dev *dev, struct mt76_queue *q, int idx,
static void
mt76_tx_cleanup_queue(struct mt76_dev *dev, struct mt76_queue *q, bool flush)
{
enum mt76_dma_dequeue type = flush ? DMA_DEQUEUE_FLUSH : DMA_DEQUEUE_IDX;
int idx;
do {
idx = mt76_dma_dequeue(dev, q, flush);
idx = mt76_dma_dequeue(dev, q, type);
if (idx < 0)
break;
@@ -359,7 +381,7 @@ mt76_rx_cleanup(struct mt76_dev *dev, struct mt76_queue *q)
int idx;
do {
idx = mt76_dma_dequeue(dev, q, true);
idx = mt76_dma_dequeue(dev, q, DMA_DEQUEUE_FLUSH);
if (idx < 0)
break;
@@ -425,7 +447,7 @@ mt76_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q, int budget)
int done = 0;
while (done < budget) {
idx = mt76_dma_dequeue(dev, q, false);
idx = mt76_dma_dequeue(dev, q, DMA_DEQUEUE_DDONE);
if (idx < 0)
break;