linux-kernel - RE: [PATCH V2] arm64: dts: qcom: sc7280-idp: Configure cts sleep pinctrl to bias-bus-hold

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Message-ID: <BL0PR02MB4564B8AEF61404D16771699CFA1D9@BL0PR02MB4564.namprd02.prod.outlook.com>
Date:   Mon, 28 Mar 2022 09:50:03 +0000
From:   "Vijaya Krishna Nivarthi (Temp)" <vnivarth@....qualcomm.com>
To:     Doug Anderson <dianders@...omium.org>,
        "Vijaya Krishna Nivarthi (Temp) (QUIC)" <quic_vnivarth@...cinc.com>
CC:     Andy Gross <agross@...nel.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        quic_msavaliy <quic_msavaliy@...cinc.com>
Subject: RE: [PATCH V2] arm64: dts: qcom: sc7280-idp: Configure cts sleep
 pinctrl to bias-bus-hold

Thank you very much.

So, we understand we could configure both default and sleep states of cts pin to bias-bus-hold.
We will test this change for power impact on sc7280 and post an update.
For sc7180, we will check and get back.

-----Original Message-----
From: Doug Anderson <dianders@...omium.org> 
Sent: Friday, March 25, 2022 8:13 PM
To: Vijaya Krishna Nivarthi (Temp) (QUIC) <quic_vnivarth@...cinc.com>
Cc: Andy Gross <agross@...nel.org>; bjorn.andersson@...aro.org; Rob Herring <robh+dt@...nel.org>; linux-arm-msm <linux-arm-msm@...r.kernel.org>; open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@...r.kernel.org>; LKML <linux-kernel@...r.kernel.org>; quic_msavaliy <quic_msavaliy@...cinc.com>
Subject: Re: [PATCH V2] arm64: dts: qcom: sc7280-idp: Configure cts sleep pinctrl to bias-bus-hold

WARNING: This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros.

Hi,

On Fri, Mar 25, 2022 at 7:06 AM Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com> wrote:
>
> WLAN rail was leaking power during RBSC/sleep even after turning BT off.
> Change sleep pinctrl configuration to handle same.
>
> Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
> ---
> v2: used bias-bus-hold as per review comments
> v1: intial patch used bias-disable
> ---
>  arch/arm64/boot/dts/qcom/sc7280-idp.dtsi | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

No objections from me now. ...but we should probably be changing _all_ of them? ...and by "all" I mean _both_ the sleep and wake state of the pins and this config across all the devices. In the very least all the
sc7280 ones, but maybe even the sc7180 ones.

$ git grep "Configure a pull-down on CTS" -- arch/arm64/boot/dts
arch/arm64/boot/dts/qcom/sc7180-idp.dts:                 * Configure a
pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7180-idp.dts:                         *
Configure a pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi:            * Configure a
pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi:                    *
Configure a pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts:      *
Configure a pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts:
  * Configure a pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7280-idp.dtsi:        * Configure a
pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7280-idp.dtsi:                * Configure a
pull-down on CTS to match the pull of
arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi:     /* Configure a
pull-down on CTS to match the pull of the Bluetooth module. */
arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi:              * Configure a
pull-down on CTS to match the pull of

-Doug