Re: [v2 PATCH] thermal: rcar_gen3_thermal: Add Standby/Reset Mode support

["Niklas Söderlund" <niklas.soderlund@ragnatech.se>]

Hi Hoan,

Thanks for your work.

Sorry for very late review, somehow this got lost in my inbox.

On 2018-11-06 15:08:26 +0900, Nguyen An Hoan wrote:
> From: Hoan Nguyen An <na-hoan@jinso.co.jp>
> 
> According to the hardware manual, Gen3 supports Standby/Reset mode.
> Add this function, and we should use this function while suspend
> to reduce the energy consumption.
> 
> Signed-off-by: Hoan Nguyen An <na-hoan@jinso.co.jp>

Nice clean commit and matches the datasheet,

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

Interrupts fire both before and after suspending as expected,

Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

> ---
>  drivers/thermal/rcar_gen3_thermal.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
> index 7aed533..e654519 100644
> --- a/drivers/thermal/rcar_gen3_thermal.c
> +++ b/drivers/thermal/rcar_gen3_thermal.c
> @@ -447,11 +447,32 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> +static int rcar_gen3_thermal_reset(struct rcar_gen3_thermal_priv* priv)
> +{
> +	unsigned int i;
> +	u32 reg_val;
> +
> +	for (i = 0; i < priv->num_tscs; i++) {
> +		struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
> +
> +		rcar_gen3_thermal_write(tsc, REG_GEN3_IRQEN, 0);
> +		rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
> +
> +		reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
> +		rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val & ~THCTR_THSST);
> +	}
> +
> +	usleep_range(1000, 2000);
> +
> +	return 0;
> +}
> +
>  static int __maybe_unused rcar_gen3_thermal_suspend(struct device *dev)
>  {
>  	struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
>  
> -	rcar_thermal_irq_set(priv, false);
> +	/* Reset to enter standby mode */
> +	rcar_gen3_thermal_reset(priv);
>  
>  	return 0;
>  }
> -- 
> 2.7.4
> 

-- 
Regards,
Niklas Söderlund