From patchwork Fri Mar 13 16:04:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rasmus Villemoes X-Patchwork-Id: 243618 List-Id: U-Boot discussion From: rasmus.villemoes at prevas.dk (Rasmus Villemoes) Date: Fri, 13 Mar 2020 17:04:56 +0100 Subject: [PATCH 1/3] watchdog: remove stale ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS from wdt.h In-Reply-To: <20200313160458.19727-1-rasmus.villemoes@prevas.dk> References: <39e2b876-6ba1-59b6-4ddd-068e120f9b4e@denx.de> <20200313160458.19727-1-rasmus.villemoes@prevas.dk> Message-ID: <20200313160458.19727-2-rasmus.villemoes@prevas.dk> Since WATCHDOG_TIMEOUT_MSECS was converted to Kconfig (commit ca51ef7c0c), CONFIG_WATCHDOG_TIMEOUT_MSECS has been guaranteed to be defined. So remove the dead fallback ifdeffery. Signed-off-by: Rasmus Villemoes Reviewed-by: Stefan Roese --- include/wdt.h | 3 --- 1 file changed, 3 deletions(-) diff --git a/include/wdt.h b/include/wdt.h index 5bcff24ab3..e833d3a772 100644 --- a/include/wdt.h +++ b/include/wdt.h @@ -107,9 +107,6 @@ struct wdt_ops { }; #if CONFIG_IS_ENABLED(WDT) -#ifndef CONFIG_WATCHDOG_TIMEOUT_MSECS -#define CONFIG_WATCHDOG_TIMEOUT_MSECS (60 * 1000) -#endif #define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000) static inline int initr_watchdog(void) From patchwork Fri Mar 13 16:04:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rasmus Villemoes X-Patchwork-Id: 243617 List-Id: U-Boot discussion From: rasmus.villemoes at prevas.dk (Rasmus Villemoes) Date: Fri, 13 Mar 2020 17:04:57 +0100 Subject: [PATCH 2/3] watchdog: move initr_watchdog() to wdt-uclass.c In-Reply-To: <20200313160458.19727-1-rasmus.villemoes@prevas.dk> References: <39e2b876-6ba1-59b6-4ddd-068e120f9b4e@denx.de> <20200313160458.19727-1-rasmus.villemoes@prevas.dk> Message-ID: <20200313160458.19727-3-rasmus.villemoes@prevas.dk> This function is a bit large for an inline function, and for U-Boot proper, it is called via a function pointer anyway (in board_r.c), so cannot be inlined. It will shortly set a global variable to be used by the watchdog_reset() function in wdt-uclass.c, so this also allows making that variable local to wdt-uclass.c. The WATCHDOG_TIMEOUT_SECS define is not used elsewhere. Signed-off-by: Rasmus Villemoes Reviewed-by: Stefan Roese --- drivers/watchdog/wdt-uclass.c | 33 +++++++++++++++++++++++++++++++++ include/wdt.h | 35 +---------------------------------- 2 files changed, 34 insertions(+), 34 deletions(-) diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c index 309a0e9c5b..fb3e247c5f 100644 --- a/drivers/watchdog/wdt-uclass.c +++ b/drivers/watchdog/wdt-uclass.c @@ -13,6 +13,39 @@ DECLARE_GLOBAL_DATA_PTR; +#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000) + +int initr_watchdog(void) +{ + u32 timeout = WATCHDOG_TIMEOUT_SECS; + + /* + * Init watchdog: This will call the probe function of the + * watchdog driver, enabling the use of the device + */ + if (uclass_get_device_by_seq(UCLASS_WDT, 0, + (struct udevice **)&gd->watchdog_dev)) { + debug("WDT: Not found by seq!\n"); + if (uclass_get_device(UCLASS_WDT, 0, + (struct udevice **)&gd->watchdog_dev)) { + printf("WDT: Not found!\n"); + return 0; + } + } + + if (CONFIG_IS_ENABLED(OF_CONTROL)) { + timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec", + WATCHDOG_TIMEOUT_SECS); + } + + wdt_start(gd->watchdog_dev, timeout * 1000, 0); + gd->flags |= GD_FLG_WDT_READY; + printf("WDT: Started with%s servicing (%ds timeout)\n", + IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout); + + return 0; +} + int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags) { const struct wdt_ops *ops = device_get_ops(dev); diff --git a/include/wdt.h b/include/wdt.h index e833d3a772..aea5abc768 100644 --- a/include/wdt.h +++ b/include/wdt.h @@ -106,39 +106,6 @@ struct wdt_ops { int (*expire_now)(struct udevice *dev, ulong flags); }; -#if CONFIG_IS_ENABLED(WDT) -#define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000) - -static inline int initr_watchdog(void) -{ - u32 timeout = WATCHDOG_TIMEOUT_SECS; - - /* - * Init watchdog: This will call the probe function of the - * watchdog driver, enabling the use of the device - */ - if (uclass_get_device_by_seq(UCLASS_WDT, 0, - (struct udevice **)&gd->watchdog_dev)) { - debug("WDT: Not found by seq!\n"); - if (uclass_get_device(UCLASS_WDT, 0, - (struct udevice **)&gd->watchdog_dev)) { - printf("WDT: Not found!\n"); - return 0; - } - } - - if (CONFIG_IS_ENABLED(OF_CONTROL)) { - timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec", - WATCHDOG_TIMEOUT_SECS); - } - - wdt_start(gd->watchdog_dev, timeout * 1000, 0); - gd->flags |= GD_FLG_WDT_READY; - printf("WDT: Started with%s servicing (%ds timeout)\n", - IS_ENABLED(CONFIG_WATCHDOG) ? "" : "out", timeout); - - return 0; -} -#endif +int initr_watchdog(void); #endif /* _WDT_H_ */ From patchwork Fri Mar 13 16:04:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rasmus Villemoes X-Patchwork-Id: 243619 List-Id: U-Boot discussion From: rasmus.villemoes at prevas.dk (Rasmus Villemoes) Date: Fri, 13 Mar 2020 17:04:58 +0100 Subject: [PATCH 3/3] watchdog: honour hw_margin_ms DT property In-Reply-To: <20200313160458.19727-1-rasmus.villemoes@prevas.dk> References: <39e2b876-6ba1-59b6-4ddd-068e120f9b4e@denx.de> <20200313160458.19727-1-rasmus.villemoes@prevas.dk> Message-ID: <20200313160458.19727-4-rasmus.villemoes@prevas.dk> Some watchdog devices, e.g. external gpio-triggered ones, must be reset more often than once per second, which means that the current rate-limiting logic in watchdog_reset() fails to keep the board alive. gpio-wdt.txt in the linux source tree defines a "hw_margin_ms" property used to specifiy the maximum time allowed between resetting the device. Allow any watchdog device to specify such a property, and then use a reset period of one quarter of that. We keep the current default of resetting once every 1000ms. Signed-off-by: Rasmus Villemoes Reviewed-by: Stefan Roese --- drivers/watchdog/wdt-uclass.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c index fb3e247c5f..436a52fd08 100644 --- a/drivers/watchdog/wdt-uclass.c +++ b/drivers/watchdog/wdt-uclass.c @@ -15,6 +15,12 @@ DECLARE_GLOBAL_DATA_PTR; #define WATCHDOG_TIMEOUT_SECS (CONFIG_WATCHDOG_TIMEOUT_MSECS / 1000) +/* + * Reset every 1000ms, or however often is required as indicated by a + * hw_margin_ms property. + */ +static ulong reset_period = 1000; + int initr_watchdog(void) { u32 timeout = WATCHDOG_TIMEOUT_SECS; @@ -36,6 +42,8 @@ int initr_watchdog(void) if (CONFIG_IS_ENABLED(OF_CONTROL)) { timeout = dev_read_u32_default(gd->watchdog_dev, "timeout-sec", WATCHDOG_TIMEOUT_SECS); + reset_period = dev_read_u32_default(gd->watchdog_dev, "hw_margin_ms", + 4*reset_period)/4; } wdt_start(gd->watchdog_dev, timeout * 1000, 0); @@ -117,7 +125,7 @@ void watchdog_reset(void) /* Do not reset the watchdog too often */ now = get_timer(0); if (time_after(now, next_reset)) { - next_reset = now + 1000; /* reset every 1000ms */ + next_reset = now + reset_period; wdt_reset(gd->watchdog_dev); } }