Re: [PATCH v2 1/3] thermal: rockchip: fix up the tsadc pinctrl setting error

[Daniel Lezcano]

On 25/04/2019 12:12, Elaine Zhang wrote:
> Explicitly use the pinctrl to set/unset the right mode
> instead of relying on the pinctrl init mode.
> And it requires setting the tshut polarity before select pinctrl.
> 
> When the temperature sensor mode is set to 0, it will automatically
> reset the board via the Clock-Reset-Unit (CRU) if the over temperature
> threshold is reached. However, when the pinctrl initializes, it does a
> transition to "otp_out" which may lead the SoC restart all the time.
> 
> "otp_out" IO may be connected to the RESET circuit on the hardware.
> If the IO is in the wrong state, it will trigger RESET.
> (similar to the effect of pressing the RESET button)
> which will cause the soc to restart all the time.
> 
> Signed-off-by: Elaine Zhang <zhangqing@xxxxxxxxxxxxxx>
> ---
>  drivers/thermal/rockchip_thermal.c | 37 ++++++++++++++++++++++++++++++++++---
>  1 file changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
> index 9c7643d62ed7..03ff494f2864 100644
> --- a/drivers/thermal/rockchip_thermal.c
> +++ b/drivers/thermal/rockchip_thermal.c
> @@ -172,6 +172,9 @@ struct rockchip_thermal_data {
>  	int tshut_temp;
>  	enum tshut_mode tshut_mode;
>  	enum tshut_polarity tshut_polarity;
> +	struct pinctrl *pinctrl;
> +	struct pinctrl_state *gpio_state;
> +	struct pinctrl_state *otp_state;
>  };
>  
>  /**
> @@ -1242,6 +1245,8 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
>  		return error;
>  	}
>  
> +	thermal->chip->control(thermal->regs, false);
> +
>  	error = clk_prepare_enable(thermal->clk);
>  	if (error) {
>  		dev_err(&pdev->dev, "failed to enable converter clock: %d\n",
> @@ -1267,6 +1272,31 @@ static int rockchip_thermal_probe(struct platform_device *pdev)
>  	thermal->chip->initialize(thermal->grf, thermal->regs,
>  				  thermal->tshut_polarity);
>  
> +	if (thermal->tshut_mode == TSHUT_MODE_GPIO) {
> +		thermal->pinctrl = devm_pinctrl_get(&pdev->dev);
> +		if (IS_ERR(thermal->pinctrl)) {
> +			dev_err(&pdev->dev, "failed to find thermal pinctrl\n");
> +			panic("panic_on_find thermal pinctrl...\n");

I realize my comment was confusing. I was not saying to add a panic()
call here but that the code was accessing a NULL pointer. Please remove
the panic.

> +			return PTR_ERR(thermal->pinctrl);
> +		}
> +
> +		thermal->gpio_state = pinctrl_lookup_state(thermal->pinctrl,
> +							   "gpio");
> +		if (IS_ERR_OR_NULL(thermal->gpio_state)) {
> +			dev_err(&pdev->dev, "failed to find thermal gpio state\n");
> +			return -EINVAL;
> +		}
> +
> +		thermal->otp_state = pinctrl_lookup_state(thermal->pinctrl,
> +							  "otpout");
> +		if (IS_ERR_OR_NULL(thermal->otp_state)) {
> +			dev_err(&pdev->dev, "failed to find thermal otpout state\n");
> +			return -EINVAL;
> +		}
> +
> +		pinctrl_select_state(thermal->pinctrl, thermal->otp_state);

I don't understand this portion of code. The test above says tshut_mode
is TSHUT_MODE_GPIO. Why acting on thermal->otp_state then ?


In my previous comment, I was suggesting the following:

Two more fields instead of three:

	struct rockchip_thermal_data {
  		int tshut_temp;
	  	enum tshut_mode tshut_mode;
  		enum tshut_polarity tshut_polarity;
	 	struct pinctrl *pinctrl;
		struct pinctrl_state *pinctrl_state;
	};

	[ ... ]

	thermal->pinctrl = devm_pinctrl_get(&pdev->dev);
	if (IS_ERR(thermal->pinctrl)) {
		dev_err("...");
		return PTR_ERR(thermal->pinctrl);
	}

	thermal->pinctrl_state = pinctrl_lookup_state(thermal->pinctrl,
		thermal->tshut_mode == TSHUT_MODE_GPIO ? "gpio" :
							"otpout";

	if (IS_ERR_OR_NULL(thermal->pinctrl_state) {
		dev_err("...");
		return PTR_ERR(thermal->pinctrl_state);
	}

 	pinctrl_select_state(thermal->pinctrl, thermal->pinctrl_state);


	[ ... ]

Is it wrong ?


> +	}
> +
>  	for (i = 0; i < thermal->chip->chn_num; i++) {
>  		error = rockchip_thermal_register_sensor(pdev, thermal,
>  						&thermal->sensors[i],
> @@ -1337,8 +1367,8 @@ static int __maybe_unused rockchip_thermal_suspend(struct device *dev)
>  
>  	clk_disable(thermal->pclk);
>  	clk_disable(thermal->clk);
> -
> -	pinctrl_pm_select_sleep_state(dev);
> +	if (thermal->tshut_mode == TSHUT_MODE_GPIO)
> +		pinctrl_select_state(thermal->pinctrl, thermal->gpio_state);

And then:
	 pinctrl_select_state(thermal->pinctrl, thermal->pinctrl_state);

>  
>  	return 0;
>  }
> @@ -1383,7 +1413,8 @@ static int __maybe_unused rockchip_thermal_resume(struct device *dev)
>  	for (i = 0; i < thermal->chip->chn_num; i++)
>  		rockchip_thermal_toggle_sensor(&thermal->sensors[i], true);
>  
> -	pinctrl_pm_select_default_state(dev);
> +	if (thermal->tshut_mode == TSHUT_MODE_GPIO)
> +		pinctrl_select_state(thermal->pinctrl, thermal->otp_state);

And then
	pinctrl_select_state(thermal->pinctrl, thermal->pinctrl_state);

>  	return 0;
>  }
> 


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