linux-kernel - Re: [PATCH v3 4/4] watchdog: qcom: add support to read the restart reason from IMEM

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Message-ID: <3333cfa8-381e-4c10-898b-a3c4cf8159e5@oss.qualcomm.com>
Date: Sat, 3 May 2025 00:13:29 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>,
        Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>, bod.linux@...w.ie
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v3 4/4] watchdog: qcom: add support to read the restart
 reason from IMEM

On 5/2/25 6:08 PM, Kathiravan Thirumoorthy wrote:
> 
> On 5/2/2025 7:03 PM, Guenter Roeck wrote:
>>>   static int qcom_wdt_probe(struct platform_device *pdev)
>>>   {
>>>       struct device *dev = &pdev->dev;
>>> @@ -273,8 +304,13 @@ static int qcom_wdt_probe(struct platform_device *pdev)
>>>       wdt->wdd.parent = dev;
>>>       wdt->layout = data->offset;
>>>   -    if (readl(wdt_addr(wdt, WDT_STS)) & 1)
>>> -        wdt->wdd.bootstatus = WDIOF_CARDRESET;
>>> +    ret = qcom_wdt_get_restart_reason(wdt, data);
>>> +    if (ret == -ENODEV) {
>>> +        if (readl(wdt_addr(wdt, WDT_STS)) & 1)
>>> +            wdt->wdd.bootstatus = WDIOF_CARDRESET;
>>> +    } else if (ret) {
>>> +        return ret;
>>> +    }
>>
>> Seems odd to me that there is now a function qcom_wdt_get_restart_reason()
>> but it doesn't handle all means to get the restart reason. Maybe I missed it,
>> but what is the reason for that ? Why not move reading WDT_STS into
>> qcom_wdt_get_restart_reason() as well ?
> 
> 
> No specific reason as such. I was little hesitant use "goto" statements and such as. So I thought this would be little cleaner approach. Please let me know if I have consolidate everything under qcom_wdt_get_restart_reason().

You can try grabbing the syscon handle, and if absent, fall back to the
common handling

Konrad