[PATCH v1 0/1] riscv: Introduce system suspend support

[Andrew Jones]

On Mon, Nov 27, 2023 at 10:52:52AM +0000, Conor Dooley wrote:
> On Thu, Oct 12, 2023 at 09:21:49AM +0200, Andrew Jones wrote:
> > OpenSBI v1.3 and later supports the SUSP SBI extension which has recently
> > been frozen with the freezing of SBI 2.0. This one patch series adds
> > system suspend support to Linux, which implements "suspend-to-RAM". To
> > use it, build the kernel with CONFIG_SUSPEND, boot on a platform which
> > supports system suspend, and then issue 'echo mem > /sys/power/state'.
> > It's also possible to test this Linux support on a platform without
> > system suspend by using OpenSBI's system suspend test support. To enable
> > test support add
> > 
> >       opensbi-domains {
> >           compatible = "opensbi,domain,config";
> >           system-suspend-test;
> >       };
> > 
> > to the chosen node of the device tree. With the test node present,
> > OpenSBI will wait 5 seconds on a suspend and then kick a resume.
> > 
> > Note: Resume may fail without the fix for probing misaligned access
> > speed[1]. It's best to apply that fix before attempting system suspend.
> > 
> > [1] https://lore.kernel.org/all/20230920193801.3035093-1-evan@rivosinc.com/
> > 
> > Changes for v1:
> >   - Rebase on v6.6-rc1 -- only minor Kconfig change needed
> 
> Would you mind resending this rebased on -rc1 again? It looks as if the
> patchwork CI threw a fit do to differing expectations about function
> signatures for the misaligned access probing.

Thanks for the poke. I need to repost anyway with the improved condition,
checking the SBI version. I'll try to get to this today.

Thanks,
drew