| Message ID | 20240828060212.108608-1-alexander.sverdlin@siemens.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | watchdog: imx_sc_wdt: detect if already running | expand |
On 8/27/24 23:02, A. Sverdlin wrote: > From: Alexander Sverdlin <alexander.sverdlin@siemens.com> > > Firmware (SC) WDT can be already enabled in U-Boot. Detect this case and > make CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED functional by setting > WDOG_HW_RUNNING. > > Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Guenter > --- > drivers/watchdog/imx_sc_wdt.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c > index e51fe1b78518..e6d567b11795 100644 > --- a/drivers/watchdog/imx_sc_wdt.c > +++ b/drivers/watchdog/imx_sc_wdt.c > @@ -56,6 +56,25 @@ static int imx_sc_wdt_ping(struct watchdog_device *wdog) > return 0; > } > > +static bool imx_sc_wdt_is_running(void) > +{ > + struct arm_smccc_res res; > + > + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG, > + 0, 0, 0, 0, 0, 0, &res); > + > + /* Already enabled (SC_TIMER_ERR_BUSY)? */ > + if (res.a0 == SC_TIMER_ERR_BUSY) > + return true; > + > + /* Undo only if that was us who has (successfully) enabled the WDT */ > + if (!res.a0) > + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG, > + 0, 0, 0, 0, 0, 0, &res); > + > + return false; > +} > + > static int imx_sc_wdt_start(struct watchdog_device *wdog) > { > struct arm_smccc_res res; > @@ -183,6 +202,9 @@ static int imx_sc_wdt_probe(struct platform_device *pdev) > if (ret) > return ret; > > + if (imx_sc_wdt_is_running()) > + set_bit(WDOG_HW_RUNNING, &wdog->status); > + > watchdog_stop_on_reboot(wdog); > watchdog_stop_on_unregister(wdog); >
diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c index e51fe1b78518..e6d567b11795 100644 --- a/drivers/watchdog/imx_sc_wdt.c +++ b/drivers/watchdog/imx_sc_wdt.c @@ -56,6 +56,25 @@ static int imx_sc_wdt_ping(struct watchdog_device *wdog) return 0; } +static bool imx_sc_wdt_is_running(void) +{ + struct arm_smccc_res res; + + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG, + 0, 0, 0, 0, 0, 0, &res); + + /* Already enabled (SC_TIMER_ERR_BUSY)? */ + if (res.a0 == SC_TIMER_ERR_BUSY) + return true; + + /* Undo only if that was us who has (successfully) enabled the WDT */ + if (!res.a0) + arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG, + 0, 0, 0, 0, 0, 0, &res); + + return false; +} + static int imx_sc_wdt_start(struct watchdog_device *wdog) { struct arm_smccc_res res; @@ -183,6 +202,9 @@ static int imx_sc_wdt_probe(struct platform_device *pdev) if (ret) return ret; + if (imx_sc_wdt_is_running()) + set_bit(WDOG_HW_RUNNING, &wdog->status); + watchdog_stop_on_reboot(wdog); watchdog_stop_on_unregister(wdog);