linux-kernel - Re: [PATCH] watchdog: qcom: Remove incorrect usage of QCOM_WDT_ENABLE

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Message-ID: <72cdf644c431b7b605f9d15a4a7fb7b8@codeaurora.org>
Date:   Thu, 28 Jan 2021 16:38:04 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     "Jorge Ramirez-Ortiz, Foundries" <jorge@...ndries.io>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] watchdog: qcom: Remove incorrect usage of
 QCOM_WDT_ENABLE_IRQ

On 2021-01-28 13:49, Jorge Ramirez-Ortiz, Foundries wrote:
> On 26/01/21, Sai Prakash Ranjan wrote:
>> As per register documentation, QCOM_WDT_ENABLE_IRQ which is BIT(1)
>> of watchdog control register is wakeup interrupt enable bit and
>> not related to bark interrupt at all, BIT(0) is used for that.
>> So remove incorrect usage of this bit when supporting bark irq for
>> pre-timeout notification. Currently with this bit set and bark
>> interrupt specified, pre-timeout notification and/or watchdog
>> reset/bite does not occur.
>> 
>> Fixes: 36375491a439 ("watchdog: qcom: support pre-timeout when the 
>> bark irq is available")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
>> ---
>> 
>> Reading the conversations from when qcom pre-timeout support was
>> added [1], Bjorn already had mentioned it was not right to touch this
>> bit, not sure which SoC the pre-timeout was tested on at that time,
>> but I have tested this on SDM845, SM8150, SC7180 and watchdog bark
>> and bite does not occur with enabling this bit with the bark irq
>> specified in DT.
> 
> this was tested on QCS404. have you validated there? unfortunately I
> no longer have access to that hardware or the documentation
> 

I didn't validate on qcs404 yet since I didn't have access to it.
But now that you mention it, let me arrange for a setup and test it
there as well. Note: I did not see bark irq entry in upstream qcs404
dtsi, so you must have had some local change when you tested?

Thanks,
Sai

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