[PATCH V3 6/7] backlight: qcom-wled: add support for short circuit handling

[Bjorn Andersson]

On Tue 19 Jun 04:13 PDT 2018, Kiran Gunda wrote:

> Handle the short circuit interrupt and check if the short circuit
> interrupt is valid. Re-enable the module to check if it goes
> away. Disable the module altogether if the short circuit event
> persists.
> 
> Signed-off-by: Kiran Gunda <kgunda at codeaurora.org>
> ---
>  drivers/video/backlight/qcom-wled.c | 130 +++++++++++++++++++++++++++++++++++-
>  1 file changed, 127 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
[..]
>  struct wled {
>  	const char *name;
>  	struct device *dev;
>  	struct regmap *regmap;
> +	struct mutex lock;	/* Lock to avoid race from ISR */
> +	ktime_t last_short_event;
>  	u16 ctrl_addr;
>  	u16 sink_addr;
>  	u32 brightness;
>  	u32 max_brightness;
> +	u32 short_count;
>  	const int *version;
> +	bool disabled_by_short;
> +	bool has_short_detect;

The use of feature flags, instead of checking the version, like this is
good!

>  
>  	struct wled_config cfg;
>  	int (*wled_set_brightness)(struct wled *wled, u16 brightness);

Reviewed-by: Bjorn Andersson <bjorn.andersson at linaro.org>

Regards,
Bjorn