Dear Ilya Yanok,
Hi,
21.06.2012 02:14, Tom Rini wrote:
USB EHCI and DCACHE are not compatible, so disable DCACHE support at build-time as run-time disable is insufficient for USB use.
Sorry for missing this discussion. I think compile-time disabling of the cache is too brutal. ehci-hcd cache handling is broken anyway: doing unaligned flushes/invalidates is a bug, and we know for sure that upper layers don't care about alignment (and I bet ehci-hcd does this even for its internal buffers). So what's the point in all this cache handling in ehci-hcd? It's not going to work anyway and just produces problems. So I suggest to just disable all this stuff until generic code will be fixed. Alternatively we can do bounce-buffering inside driver.
We should rather introduce generic bounce buffer. But the upper layers are getting fixed recently so we should be getting there.
Regards, Ilya.
Best regards, Marek Vasut