linux-kernel - Re: [PATCH] watchdog: qcom: Report reboot reason

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Date:	Tue, 5 Apr 2016 12:07:30 -0700
From:	Grant Grundler <grundler@...omium.org>
To:	Guenter Roeck <groeck@...omium.org>
Cc:	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	linux-watchdog@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] watchdog: qcom: Report reboot reason

On Mon, Apr 4, 2016 at 5:37 PM, Guenter Roeck <groeck@...omium.org> wrote:
> The Qualcom watchdog timer block reports if the system was reset by the
> watchdog. Pass the information to user space.
>
> Cc: Grant Grundler <grundler@...omium.org>
> Signed-off-by: Guenter Roeck <groeck@...omium.org>

Reviewed-by: Grant Grundler <grundler@...omium.org>
Tested-by: Grant Grundler <grundler@...omium.org>

Thanks Guenter! :)

FTR, this landed in the chromeos-3.14 (and chromeos-3.18 shortly)
branches and will be included in a future update for TP-Link Onhub
devices.

cheers,
grant

> ---
>  drivers/watchdog/qcom-wdt.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
> index 20563cc..a043fa4 100644
> --- a/drivers/watchdog/qcom-wdt.c
> +++ b/drivers/watchdog/qcom-wdt.c
> @@ -21,6 +21,7 @@
>
>  #define WDT_RST                0x38
>  #define WDT_EN         0x40
> +#define WDT_STS                0x44
>  #define WDT_BITE_TIME  0x5C
>
>  struct qcom_wdt {
> @@ -108,7 +109,8 @@ static const struct watchdog_ops qcom_wdt_ops = {
>  static const struct watchdog_info qcom_wdt_info = {
>         .options        = WDIOF_KEEPALIVEPING
>                         | WDIOF_MAGICCLOSE
> -                       | WDIOF_SETTIMEOUT,
> +                       | WDIOF_SETTIMEOUT
> +                       | WDIOF_CARDRESET,
>         .identity       = KBUILD_MODNAME,
>  };
>
> @@ -171,6 +173,9 @@ static int qcom_wdt_probe(struct platform_device *pdev)
>         wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
>         wdt->wdd.parent = &pdev->dev;
>
> +       if (readl(wdt->base + WDT_STS) & 1)
> +               wdt->wdd.bootstatus = WDIOF_CARDRESET;
> +
>         /*
>          * If 'timeout-sec' unspecified in devicetree, assume a 30 second
>          * default, unless the max timeout is less than 30 seconds, then use
> --
> 2.8.0.rc3.226.g39d4020
>