linux-kernel - RE: [PATCH V3 2/2] timer: imx-tpm: add imx tpm timer support

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Message-ID: <alpine.DEB.2.20.1707041736270.9000@nanos>
Date:   Tue, 4 Jul 2017 17:37:00 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "A.s. Dong" <aisheng.dong@....com>
cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Jacky Bai <ping.bai@....com>,
        Anson Huang <anson.huang@....com>,
        "dongas86@...il.com" <dongas86@...il.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Anson Huang <anson.huang@....com>
Subject: RE: [PATCH V3 2/2] timer: imx-tpm: add imx tpm timer support

On Tue, 4 Jul 2017, A.s. Dong wrote:
> +       /*
> +        * NOTE: We observed in a very small probability, the bus fabric
> +        * contention between GPU and A7 may results a few cycles delay
> +        * of writing CNT registers which may cause the min_delta event got
> +        * missed, so we need add a ETIME check here in case it happened.
> +        */
>         return (int)((next - now) <= 0) ? -ETIME : 0;
>  }
> 
> Do you think it's ok?

Looks about right.