Re: [PATCH] backlight: qcom-wled: Use sink_addr for sync toggle

From: Daniel Thompson <daniel.thompson@linaro.org>
To: Marijn Suijten <marijn.suijten@somainline.org>
Cc: phone-devel@vger.kernel.org,
	~postmarketos/upstreaming@lists.sr.ht,
	AngeloGioacchino Del Regno 
	<angelogioacchino.delregno@somainline.org>,
	Konrad Dybcio <konrad.dybcio@somainline.org>,
	Martin Botka <martin.botka@somainline.org>,
	Kiran Gunda <kgunda@codeaurora.org>,
	Obeida Shamoun <oshmoun100@googlemail.com>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Lee Jones <lee.jones@linaro.org>,
	Jingoo Han <jingoohan1@gmail.com>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] backlight: qcom-wled: Use sink_addr for sync toggle
Date: Mon, 15 Mar 2021 12:21:58 +0000	[thread overview]
Message-ID: <20210315122158.ptqi6xvngf6ihjum@maple.lan> (raw)
In-Reply-To: <20210314101110.48024-1-marijn.suijten@somainline.org>

On Sun, Mar 14, 2021 at 11:11:10AM +0100, Marijn Suijten wrote:
> From: Obeida Shamoun <oshmoun100@googlemail.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@googlemail.com>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
> Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>

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