From: Amelie Delaunay Date: Wed, 4 Oct 2023 15:50:23 +0000 (+0200) Subject: dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=1e3b981a25dbd9d703587bfdc089b8d1ee12b019;p=kernel.git dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining 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: 723795173ce1 ("dmaengine: stm32-dma: add support to trigger STM32 MDMA") Signed-off-by: Amelie Delaunay Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231004155024.2609531-1-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 37674029cb427..6d7ab83358c6c 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,