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dmaengine: stm32-dma3: add device_pause and device_resume ops

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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>
Link: https://lore.kernel.org/r/20240531150712.2503554-9-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Amelie Delaunay 2024-05-31 17:07:08 +02:00 committed by Vinod Koul
parent b3b893a937
commit b62a13071c
1 changed files with 31 additions and 0 deletions
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31
drivers/dma/stm32/stm32-dma3.c
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@ -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;