| Message ID | 20231004155024.2609531-1-amelie.delaunay@foss.st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining | expand |
On Wed, 04 Oct 2023 17:50:23 +0200, Amelie Delaunay wrote: > 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). > > Applied, thanks! [1/2] dmaengine: stm32-dma: fix stm32_dma_prep_slave_sg in case of MDMA chaining commit: 2df467e908ce463cff1431ca1b00f650f7a514b4 [2/2] dmaengine: stm32-dma: fix residue in case of MDMA chaining commit: 67e13e89742c3b21ce177f612bf9ef32caae6047 Best regards,
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,
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 --- drivers/dma/stm32-dma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)