[PATCH 1/2] dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining

[Amelie Delaunay]

Current Target (CT) have to be reset when starting an MDMA chaining use
case, as Double Buffer mode is activated. It ensures the DMA will start
processing the first memory target (pointed with SxM0AR).

Fixes: 723795173ce1 ("dmaengine: stm32-dma: add support to trigger STM32 MDMA")
Signed-off-by: Amelie Delaunay <amelie.delaunay at foss.st.com>
Cc: stable at vger.kernel.org
---
 drivers/dma/stm32-dma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 5c36811aa134..7427acc82259 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1113,8 +1113,10 @@ static struct dma_async_tx_descriptor *stm32_dma_prep_slave_sg(
 		chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_PFCTRL;
 
 	/* Activate Double Buffer Mode if DMA triggers STM32 MDMA and more than 1 sg */
-	if (chan->trig_mdma && sg_len > 1)
+	if (chan->trig_mdma && sg_len > 1) {
 		chan->chan_reg.dma_scr |= STM32_DMA_SCR_DBM;
+		chan->chan_reg.dma_scr &= ~STM32_DMA_SCR_CT;
+	}
 
 	for_each_sg(sgl, sg, sg_len, i) {
 		ret = stm32_dma_set_xfer_param(chan, direction, &buswidth,
-- 
2.25.1