On 21:40-20180612, Russell King - ARM Linux wrote: [...]
I started respinning the series, while there is definitely a use of implementing in u-boot, I am starting to wonder if we should also be doing this in kernel.
How does the kernel set the bit when the kernel is running in non-secure mode, when the ACTLR is read-only in that mode?
For OMAP5/DRA7 SMP systems, I just posted a patch that seems to resolve it: https://patchwork.kernel.org/patch/10461273/
This'd be similar in implementation to ARM erratum 801819 workaround that needs two pieces (u-boot + kernel). I am not really worried about OMAP5/DRA7 since they should'nt loose context in Low power modes. Other SoCs need to be aware of the constraints.
/me wishes PSCI was a standard during ARMv7, but it was'nt... So legacy v7 SoCs have implementations that are kind of different (even smc calling conventions vary).