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dmaengine: PL08x: start next descriptor from irq context

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Rather than waiting for the tasklet to run, we can start the next
descriptor from interrupt context, as soon as we know that the
previous descriptor has completed.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-05-25 15:41:13 +01:00
parent ea1605612c
commit c33b644cb3
1 changed files with 5 additions and 4 deletions
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9
drivers/dma/amba-pl08x.c
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@ -1671,10 +1671,7 @@ static void pl08x_tasklet(unsigned long data)
spin_lock_irqsave(&plchan->lock, flags);
list_splice_tail_init(&plchan->done_list, &head);
/* If a new descriptor is queued, set it up plchan->at is NULL here */
if (!list_empty(&plchan->issued_list)) {
pl08x_start_next_txd(plchan);
} else if (!list_empty(&plchan->pend_list) || plchan->phychan_hold) {
if (plchan->at || !list_empty(&plchan->pend_list) || plchan->phychan_hold) {
/*
* This channel is still in use - we have a new txd being
* prepared and will soon be queued. Don't give up the
@ -1786,6 +1783,10 @@ static irqreturn_t pl08x_irq(int irq, void *dev)
pl08x_release_mux(plchan);
dma_cookie_complete(&tx->tx);
list_add_tail(&tx->node, &plchan->done_list);
/* And start the next descriptor */
if (!list_empty(&plchan->issued_list))
pl08x_start_next_txd(plchan);
}
spin_unlock(&plchan->lock);