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Message-ID: <8d41ea98-e0e8-60c8-3237-ade5d0d169bf@rock-chips.com>
Date: Mon, 29 Apr 2019 17:51:32 +0800
From: "elaine.zhang" <zhangqing@...k-chips.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>, heiko@...ech.de
Cc: rui.zhang@...el.com, edubezval@...il.com, robh+dt@...nel.org,
mark.rutland@....com, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
xxx@...k-chips.com, xf@...k-chips.com, huangtao@...k-chips.com
Subject: Re: [PATCH v2 1/3] thermal: rockchip: fix up the tsadc pinctrl
setting error
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@...k-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;
>> }
>>
>
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