linux-kernel - Re: [PATCH] leds: ledtrig-pattern: Use last

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Date:   Fri, 30 Apr 2021 08:41:14 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     linux-leds@...r.kernel.org, Pavel Machek <pavel@....cz>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: ledtrig-pattern: Use last_repeat when applying hw
 pattern

On Sun 18 Apr 16:34 CDT 2021, Marijn Suijten wrote:

> `last_repeat` holds the actual value requested by the user whereas
> `repeat` is a software iteration variable that is unused in hardware
> patterns.
> 
> Furthermore `last_repeat` is the field returned to the user when reading
> the `repeat` sysfs property.  This field is initialized to `-1` which is
> - together with `1` - the only valid value in the upcoming Qualcomm LPG
> driver.  It is thus unexpected when `repeat` with an initialization
> value of `0` is passed into the the driver, when the sysfs property
> clearly presents a value of `-1`.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
>  drivers/leds/trigger/ledtrig-pattern.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c
> index 4d138d5317e9..2853b75df338 100644
> --- a/drivers/leds/trigger/ledtrig-pattern.c
> +++ b/drivers/leds/trigger/ledtrig-pattern.c
> @@ -126,7 +126,8 @@ static int pattern_trig_start_pattern(struct led_classdev *led_cdev)
>  
>  	if (data->is_hw_pattern) {
>  		return led_cdev->pattern_set(led_cdev, data->patterns,
> -					     data->npatterns, data->repeat);
> +					     data->npatterns,
> +					     data->last_repeat);
>  	}
>  
>  	/* At least 2 tuples for software pattern. */
> -- 
> 2.31.1
>