2011/6/14 Raju, Sundaram <sundaram@xxxxxx>: > Yes, the hardware can skip over sequences like that. > I also thought about your suggestion, at first before submitting the RFC. > But I dint pursue this because, this ioctl() call has to be made before > every single prepare call. It's not an ioctl(), ioctl()s would be expensive since they involve userspace to kernelspace context switches. It is just "ioctl()-like". It is a simple, fast function call. > I may have to end up using this if we decide not to change the API > signature for prepare APIs. Is it really so bad? It is a custom configuration after all. Even if there were many DMACs out there supporting it, we'd probably model it like this, just pass something like DMA_STRIDE_CONFIG instead of something named after a specific slave controller. This way DMACs that didn't support striding could NACK a transfer for device drivers requesting it and then it could figure out what to do. If we can get some indication as to whether more DMACs can do this kind of stuff, we'd maybe like to introduce DMA_STRIDE_CONFIG already now. Thanks, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
