[PATCH 7/7] watchdog: s3c2410: Let kernel kick watchdog
From: Sam Protsenko <semen.protsenko@linaro.org>
Date: 2021-10-28 18:36:06
Also in:
linux-devicetree, linux-samsung-soc, linux-watchdog, lkml
Subsystem:
arm/samsung s3c, s5p and exynos arm architectures, the rest, watchdog device drivers · Maintainers:
Krzysztof Kozlowski, Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
When "tmr_atboot" module param is set, the watchdog is started in driver's probe. In that case, also set WDOG_HW_RUNNING bit to let watchdog core driver know it's running. This way wathcdog core can kick the watchdog for us (if CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED option is enabled), until user space takes control. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> --- drivers/watchdog/s3c2410_wdt.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-)
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index ca082b1226e3..9af014ff1468 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c@@ -732,6 +732,21 @@ static int s3c2410wdt_probe(struct platform_device *pdev) wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt); wdt->wdt_device.parent = dev; + /* + * If "tmr_atboot" param is non-zero, start the watchdog right now. Also + * set WDOG_HW_RUNNING bit, so that watchdog core can kick the watchdog. + * + * If we're not enabling the watchdog, then ensure it is disabled if it + * has been left running from the bootloader or other source. + */ + if (tmr_atboot && started == 0) { + dev_info(dev, "starting watchdog timer\n"); + s3c2410wdt_start(&wdt->wdt_device); + set_bit(WDOG_HW_RUNNING, &wdt->wdt_device.status); + } else if (!tmr_atboot) { + s3c2410wdt_stop(&wdt->wdt_device); + } + ret = watchdog_register_device(&wdt->wdt_device); if (ret) goto err_cpufreq;
@@ -740,17 +755,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev) if (ret < 0) goto err_unregister; - if (tmr_atboot && started == 0) { - dev_info(dev, "starting watchdog timer\n"); - s3c2410wdt_start(&wdt->wdt_device); - } else if (!tmr_atboot) { - /* if we're not enabling the watchdog, then ensure it is - * disabled if it has been left running from the bootloader - * or other source */ - - s3c2410wdt_stop(&wdt->wdt_device); - } - platform_set_drvdata(pdev, wdt); /* print out a statement of readiness */
--
2.30.2
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