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arm64: dts: qcom: sc7180: Make watchdog bark interrupt edge triggered 

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 and won't get another one until the "bark"
interrupt is cleared and asserts again.

This matches how many older Qualcomm SoCs have things configured.

Fixes: 28cc13e406 ("arm64: dts: qcom: sc7180: Add watchdog bark interrupt")
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20231106144335.v2.1.Ic7577567baff921347d423b722de8b857602efb1@changeid
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Douglas Anderson 2023-11-06 14:43:28 -08:00 committed by Bjorn Andersson
parent 2c21e5a845
commit 7ac90b4cf1
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/boot/dts/qcom/sc7180.dtsi
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@ -3580,7 +3580,7 @@
compatible = "qcom,apss-wdt-sc7180", "qcom,kpss-wdt";
reg = <0 0x17c10000 0 0x1000>;
clocks = <&sleep_clk>;
interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
interrupts = <GIC_SPI 0 IRQ_TYPE_EDGE_RISING>;
};
timer@17c20000 {