linux-kernel - RE: [PATCH] ARM: imx: update the cpu power up timing setting

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Date:   Tue, 4 Dec 2018 03:18:41 +0000
From:   Anson Huang <anson.huang@....com>
To:     Fabio Estevam <festevam@...il.com>
CC:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] ARM: imx: update the cpu power up timing setting

Hi, Fabio

Best Regards!
Anson Huang

> -----Original Message-----
> From: Fabio Estevam [mailto:festevam@...il.com]
> Sent: 2018年12月3日 20:03
> To: Anson Huang <anson.huang@....com>
> Cc: Shawn Guo <shawnguo@...nel.org>; Sascha Hauer
> <s.hauer@...gutronix.de>; Sascha Hauer <kernel@...gutronix.de>; Fabio
> Estevam <fabio.estevam@....com>; Russell King - ARM Linux
> <linux@...linux.org.uk>; moderated list:ARM/FREESCALE IMX / MXC ARM
> ARCHITECTURE <linux-arm-kernel@...ts.infradead.org>; linux-kernel
> <linux-kernel@...r.kernel.org>; dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH] ARM: imx: update the cpu power up timing setting
> 
> On Mon, Dec 3, 2018 at 9:42 AM Fabio Estevam <festevam@...il.com>
> wrote:
> >
> > On Mon, Dec 3, 2018 at 12:45 AM Anson Huang <anson.huang@....com>
> wrote:
> > >
> > > The sw2iso count should cover ARM LDO ramp-up time, the MAX ARM LDO
> > > ramp-up time may be up to more than 100us on some boards, this patch
> > > sets sw2iso to 0xf
> > > (~384us) which is the reset value, and it is much more safe to cover
> > > different boards, since we have observed that some customer boards
> > > failed with current setting of 0x2.
> > >
> > > Fixes: 05136f0897b5 ("ARM: imx: support arm power off in cpuidle for
> > > i.mx6sx")
> > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> >
> > Reviewed-by: Fabio Estevam <festevam@...il.com>
> 
> Minor nit that maybe Shawn can fix while applying it: Subject should contain
> imx6sx as this change only affect this SoC.

I sent out the V2 patch to easy Shawn's work. Thanks.

Anson.