6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Amelie Delaunay amelie.delaunay@foss.st.com
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 amelie.delaunay@foss.st.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231004155024.2609531-1-amelie.delaunay@foss.st.c... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dma/stm32-dma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -1113,8 +1113,10 @@ static struct dma_async_tx_descriptor *s 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,