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

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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: 723795173c ("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>
This commit is contained in:
Amelie Delaunay
2023-10-04 17:50:23 +02:00
committed by Vinod Koul
parent 5849704217
commit 2df467e908
1 changed files with 3 additions and 1 deletions
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4
drivers/dma/stm32-dma.c
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@@ -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,