linux-kernel - Re: [PATCH v4] watchdog: qcom_wdt: set WDOG_HW

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Message-ID: <CA+HBbNFtfNcGKC0Tv7cfeBO-4p_momdQ9fr1=1hEd4O2ieskfw@mail.gmail.com>
Date:   Mon, 30 Nov 2020 19:27:00 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     Kathiravan T <kathirav@...eaurora.org>
Cc:     Guenter Roeck <linux@...ck-us.net>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        wim@...ux-watchdog.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luka Perkov <luka.perkov@...tura.hr>
Subject: Re: [PATCH v4] watchdog: qcom_wdt: set WDOG_HW_RUNNING bit when appropriate

On Mon, Nov 2, 2020 at 6:19 AM Kathiravan T <kathirav@...eaurora.org> wrote:
>
>
> On 11/2/2020 10:33 AM, Guenter Roeck wrote:
> > On 11/1/20 7:58 PM, Kathiravan T wrote:
> >> On 10/31/2020 7:38 PM, Guenter Roeck wrote:
> >>> On 10/31/20 5:11 AM, Robert Marko wrote:
> >>>> If the watchdog hardware is enabled/running during boot, e.g.
> >>>> due to a boot loader configuring it, we must tell the
> >>>> watchdog framework about this fact so that it can ping the
> >>>> watchdog until userspace opens the device and takes over
> >>>> control.
> >>>>
> >>>> Do so using the WDOG_HW_RUNNING flag that exists for exactly
> >>>> that use-case.
> >>>>
> >>>> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> >>> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> >> Thanks for addressing the comments and now the patch looks good to me. One more suggestion, can we make the initcall level of the driver to subsys_initcall_sync so that the driver gets registered immediately after the watchdog_core is registered and watchdog_core starts pinging the WDT?
> >>
> > That would mean to replace module_platform_driver(), which would be a whole
> > different discussion, is not widely needed, and would potentially interfere
> > with the subsys_initcall_sync() in the watchdog core. This will require
> > specific evidence that a problem is seen in the field, and that it is truly
> > needed. Plus, it would have to be a different patch (which you could submit
> > yourself, with evidence). Let's stick with one logical change per patch,
> > please.
> >
> > Guenter
> Yeah, of course I don't want to squash the initcall level change with
> this one. Just made a suggestion to consider it. Anyway I will try to
> collect some data and post the patch by own on that suggestion. Thanks
> Guenter.
>
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
>

Any chance this could be picked for 5.11?
I have some boards depending on it for normal boot.

Regards,
Robert