linux-kernel - Re: [PATCH v2 13/13] net: ethernet: ti: cpts: fix overflow check period

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Message-ID: <20161130091258.GA28680@localhost.localdomain>
Date:   Wed, 30 Nov 2016 10:12:58 +0100
From:   Richard Cochran <richardcochran@...il.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Mugunthan V N <mugunthanvnm@...com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org, Murali Karicheri <m-karicheri2@...com>,
        Wingman Kwok <w-kwok2@...com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH  v2 13/13] net: ethernet: ti: cpts: fix overflow check
 period

On Mon, Nov 28, 2016 at 05:03:37PM -0600, Grygorii Strashko wrote:
> The CPTS drivers uses 8sec period for overflow checking with
> assumption that CPTS retclk will not exceed 500MHz. But that's not
> true on some TI platforms (Kesytone 2). As result, it is possible that
> CPTS counter will overflow more than once between two readings.
> 
> Hence, fix it by selecting overflow check period dynamically as
> max_sec_before_overflow/2, where
>  max_sec_before_overflow = max_counter_val / rftclk_freq.
> 
> Cc: John Stultz <john.stultz@...aro.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Acked-by: Richard Cochran <richardcochran@...il.com>