Hi! > > > [ Upstream commit c34f674c8875235725c3ef86147a627f165d23b4 ] > > > > > > ksz_read64() currently does some dubious byte-swapping on the two > > > halves of a 64-bit register, and then only returns the high bits. > > > Replace this with a straightforward expression. > > > > The code indeed is very strange, but there are just 2 users, and they > > will now receive byteswapped values, right? If it worked before, it > > will be broken. > > The old code swaps the bytes within each 32-bit word, attempts to > concatenate them into a 64-bit word, then swaps the bytes within the > 64-bit word. There is no need for byte-swapping, only (on little- > endian platforms) a word-swap, which is what the new code does. > > > Did this get enough testing for -stable? > > Yes, I actually developed and tested all the ksz8795 changes in 5.10 > before forward-porting to mainline. > > > Is hw little endian or high endian or...? > > The hardware is big-endian and regmap handles any necessary > byte-swapping for values up to 32 bits. > > > Note that ksz_write64() still contains the strange code, at least in > > 5.10. > > It's unnecessarily complex, but it does work. Thanks for the explanations and sorry for the noise. Indeed ksz_write64() is quite obfuscated, but I can't see a problem. Best regards, Pavel -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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