From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Huang, Tao" Subject: Re: [PATCH v2 0/4] clocksource: rockchip/timer: Support rktimer for rk3399 Date: Tue, 14 Jun 2016 12:00:12 +0800 Message-ID: <575F814C.104@rock-chips.com> References: <1465275273-22076-1-git-send-email-wxt@rock-chips.com> <20160613130625.GC10634@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20160613130625.GC10634@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: Daniel Lezcano , Caesar Wang Cc: Heiko Stuebner , dianders@chromium.org, briannorris@google.com, smbarber@google.com, linux-rockchip@lists.infradead.org, Thomas Gleixner , cf@rock-chips.com, devicetree@vger.kernel.org, Xing Zheng , Jianqun Xu , Masahiro Yamada , Brian Norris , linux-kernel@vger.kernel.org, Shawn Lin , Rob Herring , Will Deacon , Mark Rutland , Catalin Marinas , linux-arm-kernel@lists.infradead.org List-Id: linux-rockchip.vger.kernel.org Hi Daniel: On 2016=E5=B9=B406=E6=9C=8813=E6=97=A5 21:06, Daniel Lezcano wrote: > On Tue, Jun 07, 2016 at 12:54:29PM +0800, Caesar Wang wrote: >> This series patches had been tested on rockchip inside kernel. >> In order to support the rk3399 SoC timer and turn off interrupts and= IPIs to >> save power in idle. >=20 > For my personnal information, are the arch_timer in the same power do= main=20 > than the CPU ? IOW, what is the 'always-on' property in the DT ? Yes. In our SoC design, all arch (generic) timer in the same power domain of CPU core. So if one CPU core power down, the arch (generic) timer will lose it's state and stop working. While rk timer maybe in peri power domain or pmu power domain, so the timer will still work when CPU power down. But before RK3399, all SoCs with CPU power domain, do not support auto power down while cpu idle. So the arch timer can be seem as always on, i.e. we don't need a broadcast timer at all. >=20 >> Okay, it still works bootup on rk3288/other SoCs, even though many s= ocs=20 >> hasn't used >> the broadcast timer. >=20 > Yes, unfortunately the SoC design on rk3288 and the previous ones do = not=20 > allow to use a cpuidle driver with cpu/cluster power down, so obvious= ly the=20 > broadcast timer is pointless on these boards :) >=20 You are right. >> History version: >> v1: >> https://lkml.org/lkml/2016/5/25/186 >> >> Easy to test for my borad. >> localhost / # cat /proc/interrupts >> CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 >> 1: 0 0 0 0 0 0= GICv3 29 Edge arch_timer >> ... >> 5: 0 0 0 0 0 0= GICv3 113 Level rk_timer >> .. >> >> localhost / # cat /proc/timer_list | grep event_handler >> get "event_handler: hrtimer_interrupt" >> event_handler: tick_handle_oneshot_broadcast >> event_handler: hrtimer_interrupt >=20 > What are you trying to demonstrate here ? There are no interrupts for= both=20 > arch_timer and rk_timer. I don't know. Maybe Caesar do something wrong :( This is my output: CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 =2E.. 2: 2911 1967 1588 1608 1295 1606 GICv3 30 Edge arch_timer 5: 578 637 684 626 161 165 GICv3 113 Level rk_timer