linux-kernel - Re: [PATCH] pwm: tiehrpwm: Update shadow register for disabling PWMs

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Message-ID: <20190320113122.GC23838@ulmo>
Date:   Wed, 20 Mar 2019 12:31:22 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Christoph Vogtländer 
        <c.vogtlaender@...ma-surface-science.com>
Subject: Re: [PATCH] pwm: tiehrpwm: Update shadow register for disabling PWMs

On Tue, Mar 12, 2019 at 02:38:46PM +0530, Vignesh Raghavendra wrote:
> From: Christoph Vogtländer <c.vogtlaender@...ma-surface-science.com>
> 
> It must be made sure that immediate mode is not already set, when
> modifying shadow register value in ehrpwm_pwm_disable(). Otherwise
> modifications to the action-qualifier continuous S/W force
> register(AQSFRC) will be done in the active register.
> This may happen when both channels are being disabled. In this case,
> only the first channel state will be recorded as disabled in the shadow
> register. Later, when enabling the first channel again, the second
> channel would be enabled as well. Setting RLDCSF to zero, first, ensures
> that the shadow register is updated as desired.
> 
> Fixes: 38dabd91ff0b ("pwm: tiehrpwm: Fix disabling of output of PWMs")
> Signed-off-by: Christoph Vogtländer <c.vogtlaender@...ma-surface-science.com>
> [vigneshr@...com: Improve commit message]
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> ---
>  drivers/pwm/pwm-tiehrpwm.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied, thanks.

Thierry

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