Re: [PATCH] ARM: i.MX: When SRSR shows wdog then lookup reset source in wdog

[Andrey Smirnov <andrew.smirnov@gmail.com>]

On Thu, Nov 15, 2018 at 6:15 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
>
> On i.MX6 when the watchdog has resetted the system then the SRSR
> register correctly shows that the watchdog has resetted the system.
> This is not the desired result though, a "reset" in barebox or "reboot"
> in Linux should result in "RST" as reset source. So instead of making
> the SRSR register value overwrite the reset source read from the
> watchdog registers, interpret the SRSR value corresponding to watchdog
> reset as "lookup details in the watchdog registers".
>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
>  arch/arm/mach-imx/imx.c  |  6 +++---
>  drivers/watchdog/imxwd.c | 10 +++++++---
>  2 files changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-imx/imx.c b/arch/arm/mach-imx/imx.c
> index ad227663dd..f87dd76c75 100644
> --- a/arch/arm/mach-imx/imx.c
> +++ b/arch/arm/mach-imx/imx.c
> @@ -204,9 +204,9 @@ void imx_set_reset_reason(void __iomem *srsr,
>          * sure we'll always override info from watchdog driver.
>          */
>         reset_source_set_priority(type,
> -                                 RESET_SOURCE_DEFAULT_PRIORITY + 1);
> +                                 RESET_SOURCE_DEFAULT_PRIORITY);
>         reset_source_set_instance(type, instance);
>
> -       pr_info("i.MX reset reason %s (SRSR: 0x%08x)\n",
> -               reset_source_name(), reg);
> +       pr_debug("i.MX reset reason %s (SRSR: 0x%08x)\n",
> +                reset_source_name(), reg);

Can we keep this at pr_info level?

>  }
> diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
> index a66fae400c..8dba662392 100644
> --- a/drivers/watchdog/imxwd.c
> +++ b/drivers/watchdog/imxwd.c
> @@ -162,19 +162,23 @@ static void __noreturn imxwd_force_soc_reset(struct restart_handler *rst)
>  static void imx_watchdog_detect_reset_source(struct imx_wd *priv)
>  {
>         u16 val = readw(priv->base + IMX21_WDOG_WSTR);
> +       int priority = RESET_SOURCE_DEFAULT_PRIORITY;
> +
> +       if (reset_source_get() == RESET_WDG)
> +               priority++;
>
>         if (val & WSTR_COLDSTART) {
> -               reset_source_set(RESET_POR);
> +               reset_source_set_priority(RESET_POR, priority);
>                 return;
>         }
>
>         if (val & (WSTR_HARDRESET | WSTR_WARMSTART)) {
> -               reset_source_set(RESET_RST);
> +               reset_source_set_priority(RESET_RST, priority);
>                 return;
>         }
>
>         if (val & WSTR_WDOG) {
> -               reset_source_set(RESET_WDG);
> +               reset_source_set_priority(RESET_WDG, priority);
>                 return;
>         }
>
> --
> 2.19.1
>

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