dmaengine: at_xdmac: fix resume for cyclic transfers

When having cyclic transfers, the channel was paused when performing
suspend but was not correctly resumed.

Signed-off-by: Songjun Wu <songjun.wu@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel
eXtended DMA Controller driver")
Cc: <stable@vger.kernel.org> # 4.1 and later
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index d0ae4613b87e..c21aef74e8d1 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1697,6 +1697,7 @@ static int at_xdmac_device_terminate_all(struct dma_chan *chan)
         list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
                 at_xdmac_remove_xfer(atchan, desc);
 
+        clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
         clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
         spin_unlock_irqrestore(&atchan->lock, flags);
 
@@ -1829,6 +1830,8 @@ static int atmel_xdmac_resume(struct device *dev)
                 atchan = to_at_xdmac_chan(chan);
                 at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc);
                 if (at_xdmac_chan_is_cyclic(atchan)) {
+                        if (at_xdmac_chan_is_paused(atchan))
+                                at_xdmac_device_resume(chan);
                         at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
                         at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
                         at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);