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authorAmelie Delaunay <amelie.delaunay@foss.st.com>2023-10-04 17:50:23 +0200
committerVinod Koul <vkoul@kernel.org>2023-10-09 11:10:58 +0530
commit2df467e908ce463cff1431ca1b00f650f7a514b4 (patch)
tree8e3af967d4d24c3447f0316c38ee67805d44ac48 /drivers/dma
parent584970421725b7805db84714b857851fdf7203a9 (diff)
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/stm32-dma.c4
1 files changed, 3 insertions, 1 deletions
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,