backlight: qcom-wled: Use sink_addr for sync toggle

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>
---
 drivers/video/backlight/qcom-wled.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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
>

On Sun, 14 Mar 2021, 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>
> ---
>  drivers/video/backlight/qcom-wled.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Applied, thanks.