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| author | Amelie Delaunay <amelie.delaunay@foss.st.com> | 2022-08-29 18:46:44 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-09-04 20:18:02 +0300 |
| commit | b9a22954f08074b2d0126e45636eb77b66395ac5 (patch) | |
| tree | 323f4127425d6bdc5342f26eeaa38f1c4e9dd759 /drivers/dma/stm32-dmamux.c | |
| parent | c6c1a365d6115f159572106b0bfd9796b0bffd27 (diff) | |
| download | linux-b9a22954f08074b2d0126e45636eb77b66395ac5.tar.xz | |
dmaengine: stm32-dmamux: set dmamux channel id in dma features bitfield
STM32 DMAMUX is used with STM32 DMA1 and DMA2:
- DMAMUX channels 0 to 7 are connected to DMA1 channels 0 to 7
- DMAMUX channels 8 to 15 are connected to DMA2 channels 0 to 7
STM32 MDMA can be triggered by DMA1 and DMA2 channels transfer complete,
and the "request line number" is the DMAMUX channel id (e.g. DMA2 channel 0
triggers MDMA with request line 8).
To well configure MDMA, set DMAMUX channel id in DMA features bitfield,
so that DMA can update struct dma_slave_config peripheral_config properly.
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20220829154646.29867-5-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/stm32-dmamux.c')
| -rw-r--r-- | drivers/dma/stm32-dmamux.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index eee0c5aa5fb5..b431f9da9206 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -147,7 +147,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, mux->request = dma_spec->args[0]; /* craft DMA spec */ - dma_spec->args[3] = dma_spec->args[2]; + dma_spec->args[3] = dma_spec->args[2] | mux->chan_id << 16; dma_spec->args[2] = dma_spec->args[1]; dma_spec->args[1] = 0; dma_spec->args[0] = mux->chan_id - min; |