On 04/02/2017 01:40 AM, Simon Glass wrote: > Hi Marek, > > On 1 April 2017 at 14:15, Marek Vasut <ma...@denx.de> wrote: >> On 04/01/2017 08:05 PM, Simon Glass wrote: >>> On Raspberry Pi 2 and 3 a problem was noticed when enabling driver model >>> for USB: the cache invalidate after an incoming transfer does not seem to >>> work correctly. >>> >>> This may be a problem with the underlying caching implementation on armv7 >>> and armv8 but this seems very unlikely. As a work-around, use separate >>> buffers for input and output. This ensures that the input buffer will not >>> hold dirty cache data. >> >> What do you think of this patch: >> [U-Boot] usb: dwc2: invalidate the dcache before starting the DMA > > Yes that matches what I did as a hack. I didn't realise that the DMA > would go through the cache. Thanks for the pointer.
DMA should not go through the cache. I have yet to review that patch, but IMO it's relevant to this problem you observe. -- Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
