linux-kernel - Re: [PATCH] Change the interrupt from level_low to edge

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Date:   Wed, 24 May 2023 20:55:38 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     tremblay.gabriel@...il.com
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Change the interrupt from level_low to edge_falling

On Tue, May 02, 2023 at 02:31:14PM -0400, Gabriel Tremblay via B4 Relay wrote:
> From: Gabriel Tremblay <tremblay.gabriel@...il.com>
> 
> 
> 
> ---
> Lenovo's x13s internal keyboard shows responsivity issues when fast
> typing occurs. The problem is not replicated with external HID keyboard.
> 
> This fix tries to alleviate the problem but requires further testing
> and commenting.
> 

This is interesting, can you tell us a little bit more about why/how
this improves the situation? Perhaps that could help someone with
schematics to look into this further as well.

Regards,
Bjorn

> Signed-off-by: Gabriel Tremblay <tremblay.gabriel@...il.com>
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index bdcba719fc38..e8d7f02c9bf3 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -639,7 +639,7 @@ keyboard@68 {
>  		reg = <0x68>;
>  
>  		hid-descr-addr = <0x1>;
> -		interrupts-extended = <&tlmm 104 IRQ_TYPE_LEVEL_LOW>;
> +		interrupts-extended = <&tlmm 104 IRQ_TYPE_EDGE_FALLING>;
>  		vdd-supply = <&vreg_misc_3p3>;
>  		vddl-supply = <&vreg_s10b>;
>  
> 
> ---
> base-commit: 84e2893b4573da3bc0c9f24e2005442e420e3831
> change-id: 20230502-gtremblay-x13s-keyboard-289935f922e2
> 
> Best regards,
> -- 
> Gabriel Tremblay <tremblay.gabriel@...il.com>
>