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Add possibility to rely on an additional MDMA channel and chain the DMA and MDMA channels allowing to achieve faster capture. Indeed, on the MP15 platform, the MDMA engine has an higher bandwidth to the DDR than the DMA engine. Relying on that it is possible to capture frames from the DCMI IP into the DDR by using two channels as follow: DCMI -> (DMA) -> SRAM -> (MDMA) -> DDR The DMA is able by himself to trigger a MDMA request hence, once properly configured, the DCMI IP can simply trigger the DMA in order to have the data pushed up to the DDR (via the SRAM and a MDMA channel). This behavior is detailed in the document Documentation/arch/arm/stm32/stm32-dma-mdma-chaining.rst Signed-off-by: Alain Volmat <alain.volmat@foss.st.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> |
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