linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7280: enable IPA in sc7280-herobrine-lte-sku.dtsi

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Date:   Thu, 15 Dec 2022 12:10:54 -0600
From:   Alex Elder <elder@...e.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Alex Elder <elder@...aro.org>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, andersson@...nel.org,
        agross@...nel.org
Cc:     elder@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sc7280: enable IPA in
 sc7280-herobrine-lte-sku.dtsi

On 12/15/22 12:01 PM, Konrad Dybcio wrote:
> 
> 
> On 15.12.2022 18:38, Sibi Sankar wrote:
>> Alex,
>>
>> Thanks for the patch.
>>
>> On 12/9/22 00:08, Alex Elder wrote:
>>> IPA is only needed on a platform if it includes a modem, and not all
>>> SC7280 SoC variants do.  The file "sc7280-herobrine-lte-sku.dtsi" is
>>> used to encapsulate definitions related to Chrome OS SC7280 devices
>>> where a modem is present, and that's the proper place for the IPA
>>> node to be enabled.
>>>
>>> Currently IPA is enabled in "sc7280-idp.dtsi", which is included by
>>> DTS files for Qualcomm reference platforms (all of which include the
>>> modem).  That also includes "sc7280-herobrine-lte-sku.dtsi", so
>>> enabling IPA there would make it unnecessary for "sc7280-idp.dtsi"
>>> to enable it.
>>>
>>> The only other place IPA is enabled is "sc7280-qcard.dtsi".
>>> That file is included only by "sc7280-herobrine.dtsi", which
>>> is (eventually) included only by these top-level DTS files:
>>>     sc7280-herobrine-crd.dts
>>>     sc7280-herobrine-herobrine-r1.dts
>>>     sc7280-herobrine-evoker.dts
>>>     sc7280-herobrine-evoker-lte.dts
>>>     sc7280-herobrine-villager-r0.dts
>>>     sc7280-herobrine-villager-r1.dts
>>>     sc7280-herobrine-villager-r1-lte.dts
>>> All of but two of these include "sc7280-herobrine-lte-sku.dtsi", and
>>> for those cases, enabling IPA there means there is no need for it to
>>> be enabled in "sc7280-qcard.dtsi".
>>>
>>> The two remaining cases will no longer enable IPA as a result of
>>> this change:
>>>     sc7280-herobrine-evoker.dts
>>>     sc7280-herobrine-villager-r1.dts
>>> Both of these have "lte" counterparts, and are meant to represent
>>> board variants that do *not* have a modem.
>>>
>>> This is exactly the desired configuration.
>>>
>>> Signed-off-by: Alex Elder <elder@...aro.org>
>>> ---
>>>    arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi | 5 +++++
>>>    arch/arm64/boot/dts/qcom/sc7280-idp.dtsi               | 5 -----
>>>    arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi             | 5 -----
>>>    3 files changed, 5 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
>>> index ad66e5e9db4ed..956708397f035 100644
>>> --- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
>>> @@ -34,3 +34,8 @@ &remoteproc_mpss {
>>>    &rmtfs_mem {
>>>        reg = <0x0 0x9c900000 0x0 0x800000>;
>>>    };
>>> +
>>> +&ipa {
>>> +    status = "okay";
>>> +    modem-init;
>>> +};
>>
>> nit; You'll probably want to move the ipa node above remoteproc node to
>> maintain sorting.
>>
>> Reviewed-by: Sibi Sankar <quic_sibis@...cinc.com>
>> Tested-by: Sibi Sankar <quic_sibis@...cinc.com>
> That + please flip the property order, as we're trying to
> keep status last wherever possible.

Thank you, I'll post version 2 this afternoon.	-Alex

> 
> Konrad
>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>>> index f7efb9966afd1..0ddbe7f732bd9 100644
>>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
>>> @@ -376,11 +376,6 @@ &gpi_dma1 {
>>>        status = "okay";
>>>    };
>>>    -&ipa {
>>> -    status = "okay";
>>> -    modem-init;
>>> -};
>>> -
>>>    &lpass_cpu {
>>>        status = "okay";
>>>    diff --git a/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi b/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
>>> index df49564ae6dc1..cd6ee84b36fd4 100644
>>> --- a/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
>>> @@ -336,11 +336,6 @@ vreg_bob: bob {
>>>      /* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */
>>>    -&ipa {
>>> -    status = "okay";
>>> -    modem-init;
>>> -};
>>> -
>>>    &lpass_va_macro {
>>>        vdd-micb-supply = <&vreg_bob>;
>>>    };