linux-kernel - Re: [PATCH] pinctrl: qcom: lpass lpi: use default pullup/strength values

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Date:   Thu, 4 Mar 2021 19:21:53 -0500
From:   Jonathan Marek <jonathan@...ek.ca>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        "open list:PIN CONTROL SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: qcom: lpass lpi: use default pullup/strength
 values

On 3/4/21 7:05 PM, Bjorn Andersson wrote:
> On Thu 04 Mar 13:48 CST 2021, Jonathan Marek wrote:
> 
>> If these fields are not set in dts, the driver will use these variables
>> uninitialized to set the fields. Not only will it set garbage values for
>> these fields, but it can overflow into other fields and break those.
>>
>> In the current sm8250 dts, the dmic01 entries do not have a pullup setting,
>> and might not work without this change.
>>
> 
> Perhaps you didn't see it, but Dan reported this a few days back. So
> unless you object I would suggest that we include:
> 

I did not see it. But feel free to add tags.

> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Regards,
> Bjorn
> 
>> Fixes: 6e261d1090d6 ("pinctrl: qcom: Add sm8250 lpass lpi pinctrl driver")
>> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
>> ---
>>   drivers/pinctrl/qcom/pinctrl-lpass-lpi.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
>> index 369ee20a7ea95..2f19ab4db7208 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
>> @@ -392,7 +392,7 @@ static int lpi_config_set(struct pinctrl_dev *pctldev, unsigned int group,
>>   			  unsigned long *configs, unsigned int nconfs)
>>   {
>>   	struct lpi_pinctrl *pctrl = dev_get_drvdata(pctldev->dev);
>> -	unsigned int param, arg, pullup, strength;
>> +	unsigned int param, arg, pullup = LPI_GPIO_BIAS_DISABLE, strength = 2;
>>   	bool value, output_enabled = false;
>>   	const struct lpi_pingroup *g;
>>   	unsigned long sval;
>> -- 
>> 2.26.1
>>