linux-kernel - Re: [PATCH v6 0/2] soc: loongson2_pm: add power management support

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Message-Id: <556a5e72-4001-4d28-affb-831f5c8f9e26@app.fastmail.com>
Date:   Mon, 21 Aug 2023 21:03:48 -0400
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Yinbo Zhu" <zhuyinbo@...ngson.cn>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        "Conor Dooley" <conor+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        soc@...nel.org, "Ulf Hansson" <ulf.hansson@...aro.org>
Cc:     "Jianmin Lv" <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        "Liu Peibao" <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn, loongarch@...ts.linux.dev,
        "Liu Yun" <liuyun@...ngson.cn>
Subject: Re: [PATCH v6 0/2] soc: loongson2_pm: add power management support

On Thu, Aug 3, 2023, at 02:37, Yinbo Zhu wrote:
> Loongson-2 platform support Power Management Controller (ACPI) and this
> series patch was to add PM driver that base on dts and PM binding support.
>
> Change in v6:
> 		1. The patch "[PATCH v3 1/3] loongarch: export some arch-specific
> 		   pm interfaces" had been merged into mainline tree in v6.5-rc1
> 		   thus this v6 series patch need drop it and need depend on it
> 		   and it's patch link was:
> https://lore.kernel.org/all/20230615091757.24686-2-zhuyinbo@loongson.cn/
> 		2. Adding Ulf Hansson to Cc.
> 		3. Adding soc@...nel.org to Cc.
> 		4. Keep indented with one tab +2 spaces in Kconfig help text.

I talked to WANG Xuerui on IRC, and he was able to clarify some of the
missing bits of information for me, after which I merged both patches,
even though my concerns are not fully addressed:

- I still think that branching into ROM code from the kernel is a mistake
  and we should have never allowed that as an ad-hoc interface in the ACPI
  variant to start with. It's hard to change that now though, and having
  a DT interface to access the same entry point does not really make it
  worse. This might need a redesign for future firmware though, to have
  a proper runtime interface

- The bigger problem I still see is the DT-enabled boot with PMon without
  the UEFI firmware. This does not impact the DT binding, but I would
  consider all non-UEFI booting firmware images broken and not supported
  by the kernel, as we originally discussed when merging the kernel.
  These should still be fixable by upgrading PMon to a UEFI-enabled
  version.

     Arnd