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From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Chen-Yu Tsai <wens@csie.org>
Cc: "Mylène Josserand" <mylene.josserand@bootlin.com>,
	"Marc Zyngier" <marc.zyngier@arm.com>,
	"Russell King" <linux@armlinux.org.uk>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	devicetree <devicetree@vger.kernel.org>,
	quentin.schulz@bootlin.com,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"LABBE Corentin" <clabbe.montjoie@gmail.com>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 10/10] ARM: sunxi: smp: Add initialization of CNTVOFF
Date: Mon, 19 Mar 2018 14:55:05 +0100	[thread overview]
Message-ID: <20180319135505.py4evmbexm2asvlo@flea> (raw)
In-Reply-To: <CAGb2v65QHkuM2GmT4MC+tp+HqN2ecqeZt8bB5OvZm2br1AJJ-w@mail.gmail.com>

On Mon, Mar 19, 2018 at 10:14:19AM +0800, Chen-Yu Tsai wrote:
> On Mon, Mar 19, 2018 at 3:07 AM, Mylène Josserand
> <mylene.josserand@bootlin.com> wrote:
> > Hello Mark,
> >
> > Please, excuse me for this late answer and thank you for the review!
> >
> > On Wed, 7 Mar 2018 12:18:33 +0000
> > Marc Zyngier <marc.zyngier@arm.com> wrote:
> >
> >> On 23/02/18 13:37, Mylène Josserand wrote:
> >> > On Cortex-A7, the CNTVOFF register from arch timer is uninitialized.
> >>
> >> Only on A7? Is that specific to your platform?
> >
> > I do not really know other Allwinner's platforms about this subject. At
> > least, the sun9i-a80 which is a Cortex-a15/a7 does not need that but it
> > is necessary for sun8i-a83t which is a cortex-a7. Maybe, Chen-Yu or
> > Maxime could help us on it.
> 
> AFAIK all Allwinner CPUs need it if there isn't a firmware (PSCI) layer
> beneath the kernel that will do the setup. We just have
> "arm,cpu-registers-not-fw-configured" set for all the other SoCs that
> have in-kernel SMP support, which includes the A31, A23, A33 and A80.

Most of these ones are here for historical reasons though. Now that we
have U-Boot properly setting it up, we could probably remove it.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

  reply	other threads:[~2018-03-19 13:55 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-23 13:37 [PATCH v4 00/10] Sunxi: Add SMP support on A83T Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 01/10] ARM: sun9i: smp: Add sun9i dt parsing function Mylène Josserand
2018-02-23 14:54   ` Maxime Ripard
2018-02-25 15:19     ` Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 02/10] ARM: sun9i: smp: Rename clusters's power-off register Mylène Josserand
2018-02-23 14:56   ` Maxime Ripard
2018-02-25 15:20     ` Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 03/10] ARM: sun8i: smp: Add support for A83T Mylène Josserand
2018-02-23 15:03   ` Maxime Ripard
2018-02-25 15:25     ` Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 04/10] ARM: sun8i: smp: Add hotplug support for sun8i-a83t Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 05/10] ARM: dts: sun8i: Add CPUCFG device node for A83T dtsi Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 06/10] ARM: dts: sun8i: Add R_CPUCFG device node for the " Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 07/10] ARM: dts: sun8i: a83t: Add CCI-400 node Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 08/10] ARM: sunxi: smp: Move assembly code into a file Mylène Josserand
2018-02-23 15:09   ` Maxime Ripard
2018-03-01  8:21     ` Mylène Josserand
2018-02-26  6:22   ` kbuild test robot
2018-02-23 13:37 ` [PATCH v4 09/10] ARM: sunxi: smp: Move cpu_resume assembly entry into file Mylène Josserand
2018-02-23 13:37 ` [PATCH v4 10/10] ARM: sunxi: smp: Add initialization of CNTVOFF Mylène Josserand
2018-02-23 15:12   ` Maxime Ripard
2018-02-23 16:17   ` Chen-Yu Tsai
2018-02-26 10:12     ` Maxime Ripard
2018-02-26 10:25       ` Chen-Yu Tsai
2018-03-05  7:51         ` Mylène Josserand
2018-03-05  8:31           ` Maxime Ripard
2018-03-05 13:51             ` Mylène Josserand
2018-03-07 12:09     ` Marc Zyngier
2018-03-07 12:18   ` Marc Zyngier
2018-03-18 19:07     ` Mylène Josserand
2018-03-19  2:14       ` Chen-Yu Tsai
2018-03-19 13:55         ` Maxime Ripard [this message]
2018-03-19  9:21       ` Marc Zyngier
2018-03-19 10:59       ` Maxime Ripard

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