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

["elaine.zhang" <zhangqing@rock-chips.com>]

hi,

在 2019/4/28 下午8:45, Daniel Lezcano 写道:
> 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@rock-chips.com>
>> ---
>>   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.
OK, I'll fixed it.
>
>> +			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);

pinctrl select to gpio mode when tsadc suspend and shutdown.

When suspend, tsadc is disabled, the otp_pin should revert to the 
default gpio 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);

pinctrl select to otp mode when tsadc resume.

>
>>   	return 0;
>>   }
>>
>