linux-kernel - Re: [PATCH V5 2/2] backlight: qcom-wled: Correct the sync

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Message-ID: <20210323094041.GT2916463@dell>
Date:   Tue, 23 Mar 2021 09:40:41 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Kiran Gunda <kgunda@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, jingoohan1@...il.com,
        b.zolnierkie@...sung.com, dri-devel@...ts.freedesktop.org,
        daniel.thompson@...aro.org, jacek.anaszewski@...il.com,
        pavel@....cz, robh+dt@...nel.org, mark.rutland@....com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-fbdev@...r.kernel.org
Subject: Re: [PATCH V5 2/2] backlight: qcom-wled: Correct the sync_toggle
 sequence

On Thu, 18 Mar 2021, Kiran Gunda wrote:

> As per the current implementation, after FSC (Full Scale Current)
> and brightness update the sync bits are set-then-cleared.
> But, the FSC and brightness sync takes place when the sync bits are
> set (e.g. on a rising edge). So the hardware team recommends a
> clear-then-set approach in order to guarantee such a transition
> regardless of the previous register state.
> 
> Signed-off-by: Kiran Gunda <kgunda@...eaurora.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> ---
>  drivers/video/backlight/qcom-wled.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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