linux-kernel - Re: [PATCH V2] arm64: dts: qcom: sc7180: SD-card GPIO pin set bias-pull up

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Date:   Tue, 21 Jul 2020 20:42:37 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Shaik Sajida Bhanu <sbhanu@...eaurora.org>
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        robh+dt@...nel.org, mka@...omium.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, agross@...nel.org,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Subject: Re: [PATCH V2] arm64: dts: qcom: sc7180: SD-card GPIO pin set
 bias-pull up

On Tue 21 Jul 03:44 PDT 2020, Shaik Sajida Bhanu wrote:

> From: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> 
> On some sc7180 based platforms where external pull is not present on cd-gpio,
> this gpio state is getting read as HIGH when sleep config is applied on it.
> This is resulting in SDcard rescan after suspend-resume even though SDcard
> is not present.
> 

This is exactly why pinconf properties (such as bias, drive-strength)
should be defined in the board specific file.

Please move the "pinconf-sd-cd" node to sc7180-idp.dts.

Regards,
Bjorn

> Update cd-gpio sleep config with bais-pull to fix this issue.
> 
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org>
> ---
> 
> Changes since V1:
> 	- Incorporated review comments by Bjorn Andersson.
> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index d78a066..a3527c3 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -1819,7 +1819,7 @@
>  
>  				pinconf-sd-cd {
>  					pins = "gpio69";
> -					bias-disable;
> +					bias-pull-up;
>  					drive-strength = <2>;
>  				};
>  			};
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
> of Code Aurora Forum, hosted by The Linux Foundation
>