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

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Message-ID: <CAOMZO5Bc2z9mtWN5HDDbLggryEaxF6eay2Wnu8AdBSBNFZSmXw@mail.gmail.com>
Date:   Mon, 3 Dec 2018 09:42:26 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Yongcai 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>,
        NXP Linux Team <linux-imx@....com>
Subject: Re: [PATCH] ARM: imx: update the cpu power up timing setting

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>