dmaengine: at_xdmac: wait for in-progress transaction to complete after pausing a channel (cbb85e67) · Commits · 戴 / test

drivers/dma/at_xdmac.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -1136,9 +1136,14 @@ static int at_xdmac_device_pause(struct dma_chan *chan)

		dev_dbg(chan2dev(chan), "%s\n", __func__);

		if (test_and_set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status))
		return 0;

		spin_lock_bh(&atchan->lock);
		at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask);
		set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
		while (at_xdmac_chan_read(atchan, AT_XDMAC_CC)
		& (AT_XDMAC_CC_WRIP \| AT_XDMAC_CC_RDIP))
		cpu_relax();
		spin_unlock_bh(&atchan->lock);

		return 0;