linux-kernel - Re: [PATCH V1 4/5] backlight: qcom-wled: Add support for OVP interrupt handling

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Date:   Wed, 09 May 2018 10:36:01 +0530
From:   kgunda@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH V1 4/5] backlight: qcom-wled: Add support for OVP
 interrupt handling

On 2018-05-08 22:49, Bjorn Andersson wrote:
> On Tue 08 May 05:26 PDT 2018, kgunda@...eaurora.org wrote:
> 
>> On 2018-05-07 22:51, Bjorn Andersson wrote:
>> > On Thu 03 May 02:57 PDT 2018, Kiran Gunda wrote:
> [..]
>> > > @@ -220,7 +255,12 @@ static int wled_module_enable(struct wled
>> > > *wled, int val)
>> > >  				WLED3_CTRL_REG_MOD_EN,
>> > >  				WLED3_CTRL_REG_MOD_EN_MASK,
>> > >  				WLED3_CTRL_REG_MOD_EN_MASK);
>> > > -	return rc;
>> > > +	if (rc < 0)
>> > > +		return rc;
>> > > +
>> > > +	schedule_delayed_work(&wled->ovp_work, WLED_SOFT_START_DLY_US);
>> >
>> > Do you really want to delay the work on disable?
>> >
>> > Wouldn't it be better to use a delay worker for the enablement and in
>> > the disable case you cancel the work and just disable_irq() directly
>> > here.
>> >
>> Sure. Will do it in the next series.
>> > But more importantly, if this is only related to auto detection, do you
>> > really want to enable/disable the ovp_irq after you have detected the
>> > string configuration?
>> >
>> Ok. This is used for the genuine OVP detection and for the auto 
>> detection as
>> well.
> 
> What is the expected outcome of detecting an OVP condition, outside 
> auto
> detection?
> 
Ok... Out side auto detection, it is used for information purpose. I 
think it is
okay to ignore enable/disable the ovp_irq after auto detection is done.
> Regards,
> Bjorn