linux-kernel - Re: [PATCH 1/2] pwm: pca9685: fix period change with same duty cycle

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Message-ID: <20170120064428.GB4894@ulmo.ba.sec>
Date:   Fri, 20 Jan 2017 07:44:28 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Clemens Gruber <clemens.gruber@...ruber.com>
Cc:     linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stable@...r.kernel.org,
        Florian Vaussard <florian.vaussard@...g-vd.ch>
Subject: Re: [PATCH 1/2] pwm: pca9685: fix period change with same duty cycle

On Tue, Dec 13, 2016 at 04:52:50PM +0100, Clemens Gruber wrote:
> When first implementing support for changing the output frequency, an
> optimization was added to continue the PWM after changing the prescaler
> without having to reprogram the ON and OFF registers for the duty cycle,
> in case the duty cycle stayed the same.
> This was flawed, because we compared the absolute value of the duty
> cycle in nanoseconds instead of the ratio to the period.
> 
> Fix the problem by removing the shortcut.
> 
> Fixes: 01ec8472009c9 ("pwm-pca9685: Support changing the output
> frequency")
> Cc: <stable@...r.kernel.org> # v4.3+
> Signed-off-by: Clemens Gruber <clemens.gruber@...ruber.com>
> ---
>  drivers/pwm/pwm-pca9685.c | 11 -----------
>  1 file changed, 11 deletions(-)

Applied, thanks.

Thierry

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