linux-kernel - Re: [PATCH v1] pwm: mediatek: improve precision in rate calculation

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Message-ID: <20180327223314.GH28163@mithrandir>
Date:   Wed, 28 Mar 2018 00:33:15 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     sean.wang@...iatek.com
Cc:     matthias.bgg@...il.com, linux-pwm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v1] pwm: mediatek: improve precision in rate calculation

On Fri, Mar 02, 2018 at 04:49:14PM +0800, sean.wang@...iatek.com wrote:
> From: Sean Wang <sean.wang@...iatek.com>
> 
> Add a way that turning resolution from in nanosecond into in picosecond
> to improve noticeably almost 4.5% precision.
> 
> It's necessary to hold the new resolution with type u64 and thus related
> operations on u64 are applied instead in those rate calculations.
> 
> And the patch has a dependency on [1].
> 
> [1] http://lists.infradead.org/pipermail/linux-mediatek/2018-March/012225.html
> 
> Cc: stable@...r.kernel.org
> Fixes: caf065f8fd58 ("pwm: Add MediaTek PWM support")
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> ---
>  drivers/pwm/pwm-mediatek.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)

Applied, thanks.

Thierry

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