Messages in this thread | | | Subject | Re: [PATCH 0/7] MIPS DMA coherence fixes | From | Jiaxun Yang <> | Date | Tue, 21 Feb 2023 19:55:05 +0000 |
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> 2023年2月21日 19:46,Robin Murphy <robin.murphy@arm.com> 写道: > > On 2023-02-21 18:15, Jiaxun Yang wrote: >>> 2023年2月21日 17:54,Christoph Hellwig <hch@lst.de> 写道: >>> >>> Can you explain the motivation here? Also why riscv patches are at >>> the end of a mips fіxes series? >> Ah sorry for any confusion. >> So the main purpose of this patch is to fix MIPS’s broken per-device coherency. >> To be more precise, we want to be able to control the default coherency for all devices probed from >> devicetree in early boot code. > > Including the patch which actually does that would be helpful. As it is, patches 4-7 here just appear to be moving an option around for no practical effect.
Well the affect is default coherency of devicetree probed devices are now following dma_default_coherent instead of a static Kconfig option. For MIPS platform, dma_default_coherent will be determined by boot code.
Thanks - Jiaxun
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