linux-kernel - Re: [PATCH] arm64: Kconfig: Add SYS_SUPPORTS_APM

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Message-ID: <20201217164911.GB20278@gaia>
Date:   Thu, 17 Dec 2020 16:49:11 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Lecopzer Chen <lecopzer.chen@...iatek.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, mark.rutland@....com,
        matthias.bgg@...il.com, will@...nel.org, yj.chiang@...iatek.com
Subject: Re: [PATCH] arm64: Kconfig: Add SYS_SUPPORTS_APM_EMULATION

On Thu, Dec 17, 2020 at 12:41:47AM +0800, Lecopzer Chen wrote:
> so there is two points
> 1. out-of-tree function can't be approved
>     I totally agree with this :) so we may have a driver upstream in the future.

It may not be upstreamable if it relies on the old APM interface ;).

> 2. APM not make sense on arm64
> Could you please let me konw the reason why APM on ARM64 doesn't make sense?

It's a very old interface, even on x86 it is disabled in the distro
kernels. There are more modern alternatives and you should update your
driver and user space to use them (e.g. /sys/power/).

-- 
Catalin