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SubjectRe: [PATCH] watchdog: sp5100_tco: Add "action" module parameter
On 9/18/22 07:08, Vladimir Panteleev wrote:
> Allow configuring the "action" bit, as documented in [1].
>
> Previously, the only action supported by this module was to reset the
> system (0). It can now be configured to power off (1) instead.
>
> [1]: https://www.amd.com/system/files/TechDocs/44413.pdf
>
> Signed-off-by: Vladimir Panteleev <git@vladimir.panteleev.md>
> ---
> drivers/watchdog/sp5100_tco.c | 13 +++++++++++--
> drivers/watchdog/sp5100_tco.h | 2 +-
> 2 files changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
> index ae54dd33e233..802f12e8fd76 100644
> --- a/drivers/watchdog/sp5100_tco.c
> +++ b/drivers/watchdog/sp5100_tco.c
> @@ -65,6 +65,12 @@ static struct pci_dev *sp5100_tco_pci;
>
> /* module parameters */
>
> +#define WATCHDOG_ACTION 0
> +static bool action = WATCHDOG_ACTION;
> +module_param(action, bool, 0444);
> +MODULE_PARM_DESC(action, "Action taken when watchdog expires, 0 to reset, 1 to poweroff (default="
> + __MODULE_STRING(WATCHDOG_ACTION) ")");
> +

Other module parameters are not visible. I do not see the benefit of
having this one visible.

> #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat. */
> static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
> module_param(heartbeat, int, 0);
> @@ -297,8 +303,11 @@ static int sp5100_tco_timer_init(struct sp5100_tco *tco)
> if (val & SP5100_WDT_FIRED)
> wdd->bootstatus = WDIOF_CARDRESET;
>
> - /* Set watchdog action to reset the system */
> - val &= ~SP5100_WDT_ACTION_RESET;
> + /* Set watchdog action */
> + if (action)
> + val |= SP5100_WDT_ACTION;
> + else
> + val &= ~SP5100_WDT_ACTION;
> writel(val, SP5100_WDT_CONTROL(tco->tcobase));
>
> /* Set a reasonable heartbeat before we stop the timer */
> diff --git a/drivers/watchdog/sp5100_tco.h b/drivers/watchdog/sp5100_tco.h
> index 6a0986d2c94b..9752ab2b0130 100644
> --- a/drivers/watchdog/sp5100_tco.h
> +++ b/drivers/watchdog/sp5100_tco.h
> @@ -18,7 +18,7 @@
>
> #define SP5100_WDT_START_STOP_BIT BIT(0)
> #define SP5100_WDT_FIRED BIT(1)
> -#define SP5100_WDT_ACTION_RESET BIT(2)
> +#define SP5100_WDT_ACTION BIT(2)

I do not see the point of renaming this define.

> #define SP5100_WDT_DISABLED BIT(3)
> #define SP5100_WDT_TRIGGER_BIT BIT(7)
>

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