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

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commit 2df467e908ce463cff1431ca1b00f650f7a514b4 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Amelie Delaunay 2023-10-04 17:50:23 +02:00 • committed by Greg Kroah-Hartman
parent 8e7dfe9c2a
commit 1e3b981a25
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,