On 01/02/2016 10:23 PM, Ran Shalit wrote: > Hello, > > I made some reading on CMA usage with device driver, nut not quite sure yet. > Do we need to call dma_declare_contiguous or does it get called from > within videobuf2 ? > > Is there any example how to use CMA memory in v4l2 driver ? You don't need to do anything. If the architecture supports cma (ARM does, but I'm not sure if it is supported for x86_64) and it is enabled in the kernel, then you have it. All you have to do is to add cma=<memsize> to the kernel options to reserve CMA memory and when vb2 allocates buffer memory it will automatically use the CMA memory for it. Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
