linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7180: Add missing properties for Wifi node

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Date:   Sat, 11 Jul 2020 10:14:25 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Rakesh Pillai <pillair@...eaurora.org>
Cc:     'Doug Anderson' <dianders@...omium.org>,
        "'open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS'" 
        <devicetree@...r.kernel.org>, 'Evan Green' <evgreen@...omium.org>,
        'Andy Gross' <agross@...nel.org>,
        'Bjorn Andersson' <bjorn.andersson@...aro.org>,
        'Rob Herring' <robh+dt@...nel.org>,
        'linux-arm-msm' <linux-arm-msm@...r.kernel.org>,
        'LKML' <linux-kernel@...r.kernel.org>,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc7180: Add missing properties for Wifi
 node

On 2020-07-11 09:07, Rakesh Pillai wrote:
>> -----Original Message-----
>> From: Doug Anderson <dianders@...omium.org>
>> Sent: Friday, July 10, 2020 1:36 AM
>> To: Rakesh Pillai <pillair@...eaurora.org>
>> Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
>> <devicetree@...r.kernel.org>; Evan Green <evgreen@...omium.org>;
>> Andy Gross <agross@...nel.org>; Bjorn Andersson
>> <bjorn.andersson@...aro.org>; Rob Herring <robh+dt@...nel.org>; linux-
>> arm-msm <linux-arm-msm@...r.kernel.org>; LKML <linux-
>> kernel@...r.kernel.org>; Sibi Sankar <sibis@...eaurora.org>
>> Subject: Re: [PATCH] arm64: dts: qcom: sc7180: Add missing properties 
>> for
>> Wifi node
>> 
>> Hi,
>> 
>> On Thu, Jul 9, 2020 at 2:18 AM Rakesh Pillai <pillair@...eaurora.org> 
>> wrote:
>> >
>> > The wlan firmware memory is statically mapped in
>> > the Trusted Firmware, hence the wlan driver does
>> > not need to map/unmap this region dynamically.
>> >
>> > Hence add the property to indicate the wlan driver
>> > to not map/unamp the firmware memory region
>> > dynamically.
>> >
>> > Also add the chain1 voltage supply for wlan.
>> >
>> > Signed-off-by: Rakesh Pillai <pillair@...eaurora.org>
>> > ---
>> > This patch is created on top of the change by
>> > Douglas Anderson.
>> > https://lkml.org/lkml/2020/6/25/817
>> >
>> > Also the dt-bindings for the chain1 voltage supply
>> > is added by the below patch series:
>> > https://patchwork.kernel.org/project/linux-wireless/list/?series=309137
>> > ---
>> >  arch/arm64/boot/dts/qcom/sc7180-idp.dts | 2 ++
>> >  1 file changed, 2 insertions(+)
>> >
>> > diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> > index 472f7f4..4c64bc1 100644
>> > --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> > +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> > @@ -391,10 +391,12 @@
>> >
>> >  &wifi {
>> >         status = "okay";
>> > +       qcom,msa-fixed-perm;

Should we include ^^ property
in the base dts? Since I don't
foresee any platform skipping
qcom,msa-fixed-perm property.

>> 
>> At one point in time I thought +Sibi said that this wouldn't be needed
>> once the firmware was fixed.  ...afterwards you said that it was
>> needed for SSR (subsystem reset).  Would be good to get confirmation
>> from Sibi that this matches his understanding.

Yes all of ^^ happened and yes
we now need qcom,msa-fixed-perm
since the wlan_fw_mem permission
assignment in now handled in ATF.

> 
> Hi Doug,
> 
> This is now needed as the firmware memory mapping was moved to Trusted 
> firmware.
> This region is now statically mapped to avoid access from driver.
> 
>> 
>> 
>> >         vdd-0.8-cx-mx-supply = <&vreg_l9a_0p6>;
>> >         vdd-1.8-xo-supply = <&vreg_l1c_1p8>;
>> >         vdd-1.3-rfa-supply = <&vreg_l2c_1p3>;
>> >         vdd-3.3-ch0-supply = <&vreg_l10c_3p3>;
>> > +       vdd-3.3-ch1-supply = <&vreg_l11c_3p3>;
>> >         wifi-firmware {
>> >                 iommus = <&apps_smmu 0xc2 0x1>;
>> >         };
>> 
>> Other than the one question this looks good to me.
>> 
>> -Doug

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