diff options
| author |   Vignesh Raghavendra <vigneshr@ti.com> | 2023-12-13 19:31:10 +0530 |
|---|---|---|
| committer |   Wim Van Sebroeck <wim@linux-watchdog.org> | 2023-12-17 16:14:24 +0100 |
| commit | c1a6edf3b541e44e78f10bc6024df779715723f1 (patch) | |
| tree | 55238a9390a0a37a3f63f3aba5599defbdcf1fd5 /drivers/watchdog | |
| parent | watchdog: starfive: add lock annotations to fix context imbalances (diff) | |
| download | wireguard-linux-c1a6edf3b541e44e78f10bc6024df779715723f1.tar.xz wireguard-linux-c1a6edf3b541e44e78f10bc6024df779715723f1.zip | |
watchdog: rti_wdt: Drop runtime pm reference count when watchdog is unused
Call runtime_pm_put*() if watchdog is not already started during probe and re
enable it in watchdog start as required.
On K3 SoCs, watchdogs and their corresponding CPUs are under same
power-domain, so if the reference count of unused watchdogs aren't
dropped, it will lead to CPU hotplug failures as Device Management
firmware won't allow to turn off the power-domain due to dangling
reference count.
Fixes: 2d63908bdbfb ("watchdog: Add K3 RTI watchdog support")
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Tested-by: Manorit Chawdhry <m-chawdhry@ti.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231213140110.938129-1-vigneshr@ti.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/rti_wdt.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/watchdog/rti_wdt.c b/drivers/watchdog/rti_wdt.c index 8e1be7ba0103..9215793a1c81 100644 --- a/drivers/watchdog/rti_wdt.c +++ b/drivers/watchdog/rti_wdt.c @@ -77,6 +77,11 @@ static int rti_wdt_start(struct watchdog_device *wdd) { u32 timer_margin; struct rti_wdt_device *wdt = watchdog_get_drvdata(wdd); + int ret; + + ret = pm_runtime_resume_and_get(wdd->parent); + if (ret) + return ret; /* set timeout period */ timer_margin = (u64)wdd->timeout * wdt->freq; @@ -343,6 +348,9 @@ static int rti_wdt_probe(struct platform_device *pdev) if (last_ping) watchdog_set_last_hw_keepalive(wdd, last_ping); + if (!watchdog_hw_running(wdd)) + pm_runtime_put_sync(&pdev->dev); + return 0; err_iomap: @@ -357,7 +365,10 @@ static void rti_wdt_remove(struct platform_device *pdev) struct rti_wdt_device *wdt = platform_get_drvdata(pdev); watchdog_unregister_device(&wdt->wdd); - pm_runtime_put(&pdev->dev); + + if (!pm_runtime_suspended(&pdev->dev)) + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); } |