Commit cbb85e67 authored by Cyrille Pitchen's avatar Cyrille Pitchen Committed by Vinod Koul
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dmaengine: at_xdmac: wait for in-progress transaction to complete after pausing a channel 



Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 12385f45

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;