@@ -1240,6 +1240,35 @@ static int stm32_dma3_config(struct dma_chan *c, struct dma_slave_config *config
return 0;
}
+static int stm32_dma3_pause(struct dma_chan *c)
+{
+ struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
+ int ret;
+
+ ret = stm32_dma3_chan_suspend(chan, true);
+ if (ret)
+ return ret;
+
+ chan->dma_status = DMA_PAUSED;
+
+ dev_dbg(chan2dev(chan), "vchan %pK: paused\n", &chan->vchan);
+
+ return 0;
+}
+
+static int stm32_dma3_resume(struct dma_chan *c)
+{
+ struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
+
+ stm32_dma3_chan_suspend(chan, false);
+
+ chan->dma_status = DMA_IN_PROGRESS;
+
+ dev_dbg(chan2dev(chan), "vchan %pK: resumed\n", &chan->vchan);
+
+ return 0;
+}
+
static int stm32_dma3_terminate_all(struct dma_chan *c)
{
struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
@@ -1476,6 +1505,8 @@ static int stm32_dma3_probe(struct platform_device *pdev)
dma_dev->device_prep_dma_cyclic = stm32_dma3_prep_dma_cyclic;
dma_dev->device_caps = stm32_dma3_caps;
dma_dev->device_config = stm32_dma3_config;
+ dma_dev->device_pause = stm32_dma3_pause;
+ dma_dev->device_resume = stm32_dma3_resume;
dma_dev->device_terminate_all = stm32_dma3_terminate_all;
dma_dev->device_synchronize = stm32_dma3_synchronize;
dma_dev->device_tx_status = dma_cookie_status;
STM32 DMA3 controller is able to suspend an ongoing transfer (the transfer is suspended after the ongoing burst is flushed to the destination) and resume it from the point it was suspended. No need to reconfigure any register. Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com> --- drivers/dma/stm32/stm32-dma3.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)