linux-kernel - Re: [PATCH 0/3] riscv: sbi: Switch to the sys-off handler API

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Date:   Fri, 12 May 2023 14:50:17 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Conor Dooley <conor@...nel.org>
CC:     samuel@...lland.org, dmitry.osipenko@...labora.com,
        rafael.j.wysocki@...el.com, aou@...s.berkeley.edu,
        apatel@...tanamicro.com, Atish Patra <atishp@...osinc.com>,
        geert@...ux-m68k.org, heiko@...ech.de, kai.heng.feng@...onical.com,
        mcgrof@...nel.org, paulmck@...nel.org,
        Paul Walmsley <paul.walmsley@...ive.com>, pmladek@...e.com,
        yuehaibing@...wei.com, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, tangmeng@...ontech.com
Subject:     Re: [PATCH 0/3] riscv: sbi: Switch to the sys-off handler API

On Wed, 28 Dec 2022 10:30:11 PST (-0800), Conor Dooley wrote:
> Hey Samuel,
>
> On Wed, Dec 28, 2022 at 10:19:12AM -0600, Samuel Holland wrote:
>> I want to convert the axp20x PMIC poweroff handler to use the sys-off
>> API, so it can be used as a fallback for if the SBI poweroff handler
>> is unavailable. But the SBI poweroff handler still uses pm_power_off, so
>> done alone, this would cause the axp20x callback to be called first,
>> before the SBI poweroff handler has a chance to run.
>> 
>> In order to prevent this change in behavior, the SBI poweroff handler
>> needs to be converted to the sys-off API first, at a higher priority.
>> 
>> This series performs the conversion, after accounting for the fact that
>> the SBI poweroff handler is registered quite early during boot.
>> 
>> The first patch is a dependency for both this series and the PSCI
>> series[1], so I would like to get at least patch 1 merged soon.
>> 
>> [1]: https://lore.kernel.org/lkml/20221105214841.7828-1-samuel@sholland.org/
>> 
>> 
>> Samuel Holland (3):
>>   kernel/reboot: Use the static sys-off handler for any priority
>>   riscv: sbi: Share the code for unsupported extension warnings
>>   riscv: sbi: Switch to the sys-off handler API
>
> Not what other stuff has reboot support, so I gave it a whirl on
> PolarFire SoC & it seemed to work as expected:
> Tested-by: Conor Dooley <conor.dooley@...rochip.com>

Acked-by: Palmer Dabbelt <palmer@...osinc.com>

in case the reboot folks want to take these.  I'm also happy to take the 
reboot change through the RISC-V tree with an Ack.  There's some 
discussion about this in the previous patches.

>
> Thanks,
> Conor.