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Date: Fri, 29 Jan 2016 11:40:51 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Guenter Roeck <patchwork@...chwork.roeck-us.net>,
linux-watchdog@...r.kernel.org
Cc: Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org,
Timo Kokkonen <timo.kokkonen@...code.fi>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
linux-doc@...r.kernel.org, Doug Anderson <dianders@...omium.org>,
Jonathan Corbet <corbet@....net>
Subject: Re: [RFT PATCH v7 6/9] watchdog: imx2: Convert to use infrastructure
triggered keepalives
On 01/25/2016 06:53 PM, Guenter Roeck wrote:
> From: Guenter Roeck <linux@...ck-us.net>
>
> The watchdog infrastructure now supports handling watchdog keepalive
> if the watchdog is running while the watchdog device is closed.
> Convert the driver to use this infrastructure.
>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
I managed to test this patch with qemu (after implementing the imx2 watchdog
in qemu). It works as expected, so please consider it upgraded from RFT
to a "real" patch.
Guenter
> ---
> v7: Set max_hw_timeout_ms
> Rebased to v4.5-rc1
> v6: Rename WDOG_RUNNING to WDOG_HW_RUNNING
> Rebased to v4.4-rc2
> v5: Rebased to v4.4-rc1
> v4: No changes
> v3: No changes
> v2: No changes
> ---
> drivers/watchdog/imx2_wdt.c | 74 ++++++++-------------------------------------
> 1 file changed, 13 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
> index e47966aa2db0..1a48cb28718f 100644
> --- a/drivers/watchdog/imx2_wdt.c
> +++ b/drivers/watchdog/imx2_wdt.c
> @@ -25,14 +25,12 @@
> #include <linux/delay.h>
> #include <linux/init.h>
> #include <linux/io.h>
> -#include <linux/jiffies.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/moduleparam.h>
> #include <linux/of_address.h>
> #include <linux/platform_device.h>
> #include <linux/regmap.h>
> -#include <linux/timer.h>
> #include <linux/watchdog.h>
>
> #define DRIVER_NAME "imx2-wdt"
> @@ -60,7 +58,6 @@
> struct imx2_wdt_device {
> struct clk *clk;
> struct regmap *regmap;
> - struct timer_list timer; /* Pings the watchdog when closed */
> struct watchdog_device wdog;
> };
>
> @@ -146,16 +143,6 @@ static int imx2_wdt_ping(struct watchdog_device *wdog)
> return 0;
> }
>
> -static void imx2_wdt_timer_ping(unsigned long arg)
> -{
> - struct watchdog_device *wdog = (struct watchdog_device *)arg;
> - struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> -
> - /* ping it every wdog->timeout / 2 seconds to prevent reboot */
> - imx2_wdt_ping(wdog);
> - mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);
> -}
> -
> static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
> unsigned int new_timeout)
> {
> @@ -172,40 +159,19 @@ static int imx2_wdt_start(struct watchdog_device *wdog)
> {
> struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
>
> - if (imx2_wdt_is_running(wdev)) {
> - /* delete the timer that pings the watchdog after close */
> - del_timer_sync(&wdev->timer);
> + if (imx2_wdt_is_running(wdev))
> imx2_wdt_set_timeout(wdog, wdog->timeout);
> - } else
> + else
> imx2_wdt_setup(wdog);
>
> - return imx2_wdt_ping(wdog);
> -}
> -
> -static int imx2_wdt_stop(struct watchdog_device *wdog)
> -{
> - /*
> - * We don't need a clk_disable, it cannot be disabled once started.
> - * We use a timer to ping the watchdog while /dev/watchdog is closed
> - */
> - imx2_wdt_timer_ping((unsigned long)wdog);
> - return 0;
> -}
> -
> -static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog)
> -{
> - struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> + set_bit(WDOG_HW_RUNNING, &wdog->status);
>
> - if (imx2_wdt_is_running(wdev)) {
> - imx2_wdt_set_timeout(wdog, wdog->timeout);
> - imx2_wdt_timer_ping((unsigned long)wdog);
> - }
> + return imx2_wdt_ping(wdog);
> }
>
> static const struct watchdog_ops imx2_wdt_ops = {
> .owner = THIS_MODULE,
> .start = imx2_wdt_start,
> - .stop = imx2_wdt_stop,
> .ping = imx2_wdt_ping,
> .set_timeout = imx2_wdt_set_timeout,
> .restart = imx2_wdt_restart,
> @@ -253,7 +219,7 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
> wdog->info = &imx2_wdt_info;
> wdog->ops = &imx2_wdt_ops;
> wdog->min_timeout = 1;
> - wdog->max_timeout = IMX2_WDT_MAX_TIME;
> + wdog->max_hw_timeout_ms = IMX2_WDT_MAX_TIME * 1000;
> wdog->parent = &pdev->dev;
>
> ret = clk_prepare_enable(wdev->clk);
> @@ -274,9 +240,10 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
> watchdog_set_restart_priority(wdog, 128);
> watchdog_init_timeout(wdog, timeout, &pdev->dev);
>
> - setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog);
> -
> - imx2_wdt_ping_if_active(wdog);
> + if (imx2_wdt_is_running(wdev)) {
> + imx2_wdt_set_timeout(wdog, wdog->timeout);
> + set_bit(WDOG_HW_RUNNING, &wdog->status);
> + }
>
> /*
> * Disable the watchdog power down counter at boot. Otherwise the power
> @@ -309,7 +276,6 @@ static int __exit imx2_wdt_remove(struct platform_device *pdev)
> watchdog_unregister_device(wdog);
>
> if (imx2_wdt_is_running(wdev)) {
> - del_timer_sync(&wdev->timer);
> imx2_wdt_ping(wdog);
> dev_crit(&pdev->dev, "Device removed: Expect reboot!\n");
> }
> @@ -323,10 +289,9 @@ static void imx2_wdt_shutdown(struct platform_device *pdev)
>
> if (imx2_wdt_is_running(wdev)) {
> /*
> - * We are running, we need to delete the timer but will
> - * give max timeout before reboot will take place
> + * We are running, configure max timeout before reboot
> + * will take place.
> */
> - del_timer_sync(&wdev->timer);
> imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
> imx2_wdt_ping(wdog);
> dev_crit(&pdev->dev, "Device shutdown: Expect reboot!\n");
> @@ -344,10 +309,6 @@ static int imx2_wdt_suspend(struct device *dev)
> if (imx2_wdt_is_running(wdev)) {
> imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
> imx2_wdt_ping(wdog);
> -
> - /* The watchdog is not active */
> - if (!watchdog_active(wdog))
> - del_timer_sync(&wdev->timer);
> }
>
> clk_disable_unprepare(wdev->clk);
> @@ -373,19 +334,10 @@ static int imx2_wdt_resume(struct device *dev)
> * watchdog again.
> */
> imx2_wdt_setup(wdog);
> + }
> + if (imx2_wdt_is_running(wdev)) {
> imx2_wdt_set_timeout(wdog, wdog->timeout);
> imx2_wdt_ping(wdog);
> - } else if (imx2_wdt_is_running(wdev)) {
> - /* Resuming from non-deep sleep state. */
> - imx2_wdt_set_timeout(wdog, wdog->timeout);
> - imx2_wdt_ping(wdog);
> - /*
> - * But the watchdog is not active, then start
> - * the timer again.
> - */
> - if (!watchdog_active(wdog))
> - mod_timer(&wdev->timer,
> - jiffies + wdog->timeout * HZ / 2);
> }
>
> return 0;
>
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