[PATCH 1/4] watchdog: aspeed: Retain watchdog enabled state
From: Andrew Jeffery <hidden>
Date: 2017-09-18 05:50:13
Also in:
linux-watchdog, lkml, openbmc
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
An unintended post-condition of probe() is that the watchdog is disabled. Rework probe() such that we retain the value of the "enabled" bit from the control register, and take the appropriate actions with respect to the watchdog core if so. Otherwise, just configure the watchdog as directed. Signed-off-by: Andrew Jeffery <redacted> --- drivers/watchdog/aspeed_wdt.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index 79cc766cd30f..99bc6fbd8852 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c@@ -221,7 +221,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev) return -EINVAL; config = ofdid->data; - wdt->ctrl = WDT_CTRL_1MHZ_CLK; + wdt->ctrl |= readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE; + wdt->ctrl |= WDT_CTRL_1MHZ_CLK; /* * Control reset on a per-device basis to ensure the
@@ -243,11 +244,11 @@ static int aspeed_wdt_probe(struct platform_device *pdev) if (of_property_read_bool(np, "aspeed,external-signal")) wdt->ctrl |= WDT_CTRL_WDT_EXT; - writel(wdt->ctrl, wdt->base + WDT_CTRL); - - if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE) { + if (wdt->ctrl & WDT_CTRL_ENABLE) { aspeed_wdt_start(&wdt->wdd); set_bit(WDOG_HW_RUNNING, &wdt->wdd.status); + } else { + writel(wdt->ctrl, wdt->base + WDT_CTRL); } if (of_device_is_compatible(np, "aspeed,ast2500-wdt")) {
--
2.11.0