linux-kernel - Re: [PATCH] backlight: qcom-wled: Use sink

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Date:   Mon, 15 Mar 2021 12:21:58 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Kiran Gunda <kgunda@...eaurora.org>,
        Obeida Shamoun <oshmoun100@...glemail.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] backlight: qcom-wled: Use sink_addr for sync toggle

On Sun, Mar 14, 2021 at 11:11:10AM +0100, Marijn Suijten wrote:
> From: Obeida Shamoun <oshmoun100@...glemail.com>
> 
> WLED3_SINK_REG_SYNC is, as the name implies, a sink register offset.
> Therefore, use the sink address as base instead of the ctrl address.
> 
> This fixes the sync toggle on wled4, which can be observed by the fact
> that adjusting brightness now works.
> 
> It has no effect on wled3 because sink and ctrl base addresses are the
> same.  This allows adjusting the brightness without having to disable
> then reenable the module.
> 
> Signed-off-by: Obeida Shamoun <oshmoun100@...glemail.com>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>

LGTM, although an acked-by from Kiran would be nice to have:
Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>


Daniel.


> ---
>  drivers/video/backlight/qcom-wled.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 091f07e7c145..fc8b443d10fd 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -336,13 +336,13 @@ static int wled3_sync_toggle(struct wled *wled)
>  	unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
>  
>  	rc = regmap_update_bits(wled->regmap,
> -				wled->ctrl_addr + WLED3_SINK_REG_SYNC,
> +				wled->sink_addr + WLED3_SINK_REG_SYNC,
>  				mask, mask);
>  	if (rc < 0)
>  		return rc;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -				wled->ctrl_addr + WLED3_SINK_REG_SYNC,
> +				wled->sink_addr + WLED3_SINK_REG_SYNC,
>  				mask, WLED3_SINK_REG_SYNC_CLEAR);
>  
>  	return rc;
> -- 
> 2.30.2
>