On Wed, Jun 28, 2023 at 06:57:35PM +0800, Li Chen wrote: > Hi all, > > I recently encountered an issue where the dma_mask was set in the DMA controller's driver, but the consumer peripheral driver didn't set its own dma_mask. It should always take the device that is *actually* performing the DMA, since that is the device that has restrictions on what addresses can be accessed, etc. Devices that "consume" the data from a DMA controller don't access memory - they are merely the targets, and they can't on their own access host memory. Therefore, their dma mask _should_ be irrelevant. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
