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Thu, 17 Dec 2020 21:02:21 -0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs05n1.mediatek.inc (172.21.101.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 18 Dec 2020 13:02:19 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 18 Dec 2020 13:02:19 +0800 From: Lecopzer Chen To: Subject: Re: [PATCH] arm64: Kconfig: Add SYS_SUPPORTS_APM_EMULATION Date: Fri, 18 Dec 2020 13:02:20 +0800 Message-ID: <20201218050220.25803-1-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20201217164911.GB20278@gaia> References: <20201217164911.GB20278@gaia> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201218_000235_932385_CACC4EB1 X-CRM114-Status: GOOD ( 14.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, lecopzer.chen@mediatek.com, yj.chiang@mediatek.com, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, matthias.bgg@gmail.com, will@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel