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* [PATCH] watchdog: aspeed: fix hardware timeout calculation
@ 2021-04-17  3:42 rentao.bupt
  2021-04-17  4:20 ` Guenter Roeck
  0 siblings, 1 reply; 2+ messages in thread
From: rentao.bupt @ 2021-04-17  3:42 UTC (permalink / raw)
  To: Wim Van Sebroeck, Guenter Roeck, Joel Stanley, Andrew Jeffery,
	linux-watchdog, linux-arm-kernel, linux-aspeed, linux-kernel,
	openbmc, Tao Ren, Amithash Prasad
  Cc: Tao Ren

From: Tao Ren <rentao.bupt@gmail.com>

Fix hardware timeout calculation in aspeed_wdt_set_timeout function to
ensure the reload value does not exceed the hardware limit.

Fixes: efa859f7d786 ("watchdog: Add Aspeed watchdog driver")
Reported-by: Amithash Prasad <amithash@fb.com>
Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
---
 drivers/watchdog/aspeed_wdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index 7e00960651fa..507fd815d767 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -147,7 +147,7 @@ static int aspeed_wdt_set_timeout(struct watchdog_device *wdd,
 
 	wdd->timeout = timeout;
 
-	actual = min(timeout, wdd->max_hw_heartbeat_ms * 1000);
+	actual = min(timeout, wdd->max_hw_heartbeat_ms / 1000);
 
 	writel(actual * WDT_RATE_1MHZ, wdt->base + WDT_RELOAD_VALUE);
 	writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
-- 
2.17.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] watchdog: aspeed: fix hardware timeout calculation
  2021-04-17  3:42 [PATCH] watchdog: aspeed: fix hardware timeout calculation rentao.bupt
@ 2021-04-17  4:20 ` Guenter Roeck
  0 siblings, 0 replies; 2+ messages in thread
From: Guenter Roeck @ 2021-04-17  4:20 UTC (permalink / raw)
  To: rentao.bupt
  Cc: Wim Van Sebroeck, Joel Stanley, Andrew Jeffery, linux-watchdog,
	linux-arm-kernel, linux-aspeed, linux-kernel, openbmc, Tao Ren,
	Amithash Prasad

On Fri, Apr 16, 2021 at 08:42:49PM -0700, rentao.bupt@gmail.com wrote:
> From: Tao Ren <rentao.bupt@gmail.com>
> 
> Fix hardware timeout calculation in aspeed_wdt_set_timeout function to
> ensure the reload value does not exceed the hardware limit.
> 
> Fixes: efa859f7d786 ("watchdog: Add Aspeed watchdog driver")
> Reported-by: Amithash Prasad <amithash@fb.com>
> Signed-off-by: Tao Ren <rentao.bupt@gmail.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/watchdog/aspeed_wdt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> index 7e00960651fa..507fd815d767 100644
> --- a/drivers/watchdog/aspeed_wdt.c
> +++ b/drivers/watchdog/aspeed_wdt.c
> @@ -147,7 +147,7 @@ static int aspeed_wdt_set_timeout(struct watchdog_device *wdd,
>  
>  	wdd->timeout = timeout;
>  
> -	actual = min(timeout, wdd->max_hw_heartbeat_ms * 1000);
> +	actual = min(timeout, wdd->max_hw_heartbeat_ms / 1000);
>  
>  	writel(actual * WDT_RATE_1MHZ, wdt->base + WDT_RELOAD_VALUE);
>  	writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
> -- 
> 2.17.1
> 

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2021-04-17  3:42 [PATCH] watchdog: aspeed: fix hardware timeout calculation rentao.bupt
2021-04-17  4:20 ` Guenter Roeck

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