Commit b62a1307 authored by Amelie Delaunay's avatar Amelie Delaunay Committed by Vinod Koul
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dmaengine: stm32-dma3: add device_pause and device_resume ops 



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: default avatarAmelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20240531150712.2503554-9-amelie.delaunay@foss.st.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent b3b893a9

drivers/dma/stm32/stm32-dma3.c

+31 −0
Original line number Diff line number Diff line
@@ -1249,6 +1249,35 @@ 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);
@@ -1485,6 +1514,8 @@ 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;