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

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Date:   Fri, 18 Dec 2020 13:02:20 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <catalin.marinas@....com>
CC:     <lecopzer.chen@...iatek.com>,
        <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

Hi Catalin,
 
Thanks for your explanation.
 
> > 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/).

Got it! I will disscuss with our internal team to update their drivers.

thanks a lot!

BRs,
Lecopzer