dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining

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@foss.st.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20231004155024.2609531-1-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 5c36811aa1342c8df4f340dbbaeadbd77c8ef3bf..7427acc822595cd345cd1dad6b3ac2d902a4cb1e 100644 (file)
--- 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,