Messages in this thread | | | Date | Tue, 9 Dec 2014 12:07:27 +0100 | From | Arend van Spriel <> | Subject | Re: using DMA-API on ARM |
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On 12/09/14 11:29, Russell King - ARM Linux wrote: > On Tue, Dec 09, 2014 at 11:19:40AM +0100, Arend van Spriel wrote: >> The issue did not trigger overnight so it seems setting bit 22<Shared >> Attribute _Override_ Enable> solves the issue over here. Now the question is >> how to move forward with this. As I understood from Catalin this patch was >> not included as it was not considered responsibility of the linux kernel. > > It is preferable for firmware to configure the L2 cache appropriately, > which includes things like the prefetch offsets as well as feature bits > like bit 22. > > I think what I'll do is queue up a patch which adds a warning if bit 22 > is not set, suggesting that firmware is updated to set this bit.
I was thinking in the same direction. Thanks to you all for looking into this. It did not feel right to use the dma_sync_single_for_cpu() for memory allocated with dma_alloc_coherent() and I am glad this got cleared up.
Regards, Arend
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