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Date: Mon, 6 Nov 2023 13:49:04 -0800
From: Stephen Boyd <>
To: Bjorn Andersson <>, Conor Dooley <>, 
	Douglas Anderson <>, Guenter Roeck <>, 
	Konrad Dybcio <>, 
	Krzysztof Kozlowski <>
	Rob Herring <>, Wim Van Sebroeck <>, 
	Andy Gross <>, "Guilherme G. Piccoli" <>, 
	Kees Cook <>, Sai Prakash Ranjan <>, 
	Tony Luck <>,,,,
Subject: Re: [PATCH 1/9] arm64: dts: qcom: sc7180: Make watchdog bark
 interrupt edge triggered

Quoting Douglas Anderson (2023-11-03 16:34:27)
> On sc7180 when the watchdog timer fires your logs get filled with:
>   watchdog0: pretimeout event
>   watchdog0: pretimeout event
>   watchdog0: pretimeout event
>   ...
>   watchdog0: pretimeout event
> If you're using console-ramoops to debug crashes the above gets quite
> annoying since it blows away any other log messages that might have
> been there.
> The issue is that the "bark" interrupt (AKA the "pretimeout"
> interrupt) remains high until the watchdog is pet. Since we've got
> things configured as "level" triggered we'll keep getting interrupted
> over and over.
> Let's switch to edge triggered. Now we'll get one interrupt when the
> "bark" interrupt goes off we'll get one interrupt and won't get

"We'll get one" twice?

> another one until the "bark" interrupt is cleared and asserts again.
> This matches how many older Qualcomm SoCs have things configured.
> Fixes: 28cc13e4060c ("arm64: dts: qcom: sc7180: Add watchdog bark interrupt")
> Signed-off-by: Douglas Anderson <>
> ---

Reviewed-by: Stephen Boyd <>

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