Re: [PATCH 00/11] of: dma-ranges fixes and improvements
From: Christoph Hellwig <hch@infradead.org>
Date: 2019-09-30 08:20:59
Also in:
linux-devicetree, linux-pci, lkml
On Sun, Sep 29, 2019 at 01:16:20PM +0200, Arnd Bergmann wrote:
On a semi-related note, Thierry asked about one aspect of the dma-ranges property recently, which is the behavior of dma_set_mask() and related functions when a driver sets a mask that is larger than the memory area in the bus-ranges but smaller than the available physical RAM. As I understood Thierry's problem and the current code, the generic dma_set_mask() will either reject the new mask entirely or override the mask set by of_dma_configure, but it fails to set a correct mask within the limitations of the parent bus in this case.
There days dma_set_mask will only reject a mask if it is too small to be supported by the hardware. Larger than required masks are now always accepted. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel