diff options
| author | Alexander Sverdlin <alexander.sverdlin@siemens.com> | 2024-08-28 09:02:10 +0300 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2024-09-10 12:08:46 +0300 |
| commit | db60d55e1f4880b1e199d3d5eefb59c700ba3e7d (patch) | |
| tree | 3fd307acfd315e30787c57b3ac6bf97b65d6bf56 /drivers/watchdog | |
| parent | 6adb55917497047455712dd8a85d359034a415a0 (diff) | |
| download | linux-db60d55e1f4880b1e199d3d5eefb59c700ba3e7d.tar.xz | |
watchdog: imx_sc_wdt: detect if already running
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>
Link: https://lore.kernel.org/r/20240828060212.108608-1-alexander.sverdlin@siemens.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/imx_sc_wdt.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c index d73076b686d8..1280b9b1ec2a 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); |