linux-kernel - RE: [PATCH 0/3] Add SMP support for i.MX7D

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Message-ID: <AM3PR04MB13159C5A59AA393F082C2445F5EC0@AM3PR04MB1315.eurprd04.prod.outlook.com>
Date:   Fri, 26 Aug 2016 13:02:12 +0000
From:   Yongcai Huang <anson.huang@....com>
To:     Fabio Estevam <festevam@...il.com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "Sascha Hauer" <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "Shawn Guo" <shawnguo@...nel.org>
Subject: RE: [PATCH 0/3] Add SMP support for i.MX7D



Best Regards!
Anson Huang



> -----Original Message-----
> From: Fabio Estevam [mailto:festevam@...il.com]
> Sent: 2016-08-26 8:43 PM
> To: Yongcai Huang <anson.huang@....com>
> Cc: linux-arm-kernel@...ts.infradead.org; devicetree@...r.kernel.org; linux-
> kernel <linux-kernel@...r.kernel.org>; Mark Rutland
> <mark.rutland@....com>; Russell King - ARM Linux <linux@...linux.org.uk>;
> robh+dt@...nel.org; Sascha Hauer <kernel@...gutronix.de>; Fabio Estevam
> <fabio.estevam@....com>; Shawn Guo <shawnguo@...nel.org>
> Subject: Re: [PATCH 0/3] Add SMP support for i.MX7D
> 
> Hi Anson,
> 
> On Fri, Aug 26, 2016 at 8:12 AM, Anson Huang <Anson.Huang@....com> wrote:
> > i.MX7D has 2 Cortex-A7 ARM cores, and it has a different GPC design
> > than i.MX6, so this patch set adds a new GPCV2 driver for i.MX7D, and
> > also adds runtime check in SMP code to support both Cortex-A9 and
> > Cortex-A7 ARM cores.
> >
> > With this patch set, i.MX7D can boot up SMP kernel with 2 CPUs.
> 
> Currently mx7d can boot the 2 CPUs if you use PSCI in the bootloader.
> 
> Give mainline U-Boot a try and it will boot the 2 CPUs via PSCI.
> 
> There was an attempt to add gpcv2 support at:
> https://patchwork.kernel.org/patch/6919831/
> 
> , and Shawn suggested to go to the PSCI approach.
> 
> PSCI for mx7 is still missing suspend support though.
> 
> Regards,
> 
> Fabio Estevam

Thanks Fabio for the info, OK, now that i.MX7D goes with PSCI, then please
Ignore this patch set, and I will add suspend support later. Please ignore this
Patch set.

For the suggestion of replace cpu_is_xxx with soc_is_xxx by Russell King, I will
Send another patch to improve that.

Anson.