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authorAmelie Delaunay <amelie.delaunay@foss.st.com>2022-08-29 17:46:44 +0200
committerVinod Koul <vkoul@kernel.org>2022-09-04 22:48:02 +0530
commitb9a22954f08074b2d0126e45636eb77b66395ac5 (patch)
tree323f4127425d6bdc5342f26eeaa38f1c4e9dd759 /drivers/dma
parentc6c1a365d6115f159572106b0bfd9796b0bffd27 (diff)
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')
-rw-r--r--drivers/dma/stm32-dmamux.c2
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;