linux-kernel - Re: [PATCH v4 3/3] arm64: dts: qcom: sa8775p: Mark PCIe EP controller as cache coherent

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Date:   Tue, 21 Nov 2023 21:02:41 +0530
From:   Mrinmay Sarkar <quic_msarkar@...cinc.com>
To:     Johan Hovold <johan@...nel.org>
CC:     <agross@...nel.org>, <andersson@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <konrad.dybcio@...aro.org>, <mani@...nel.org>,
        <robh+dt@...nel.org>, <quic_shazhuss@...cinc.com>,
        <quic_nitegupt@...cinc.com>, <quic_ramkri@...cinc.com>,
        <quic_nayiluri@...cinc.com>, <dmitry.baryshkov@...aro.org>,
        <robh@...nel.org>, <quic_krichai@...cinc.com>,
        <quic_vbadigan@...cinc.com>, <quic_parass@...cinc.com>,
        <quic_schintav@...cinc.com>, <quic_shijjose@...cinc.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v4 3/3] arm64: dts: qcom: sa8775p: Mark PCIe EP controller
 as cache coherent


On 11/21/2023 8:25 PM, Johan Hovold wrote:
> On Tue, Nov 21, 2023 at 08:08:13PM +0530, Mrinmay Sarkar wrote:
>> The PCIe EP controller on SA8775P supports cache coherency, hence add
>> the "dma-coherent" property to mark it as such.
>>
>> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
>> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
>> ---
>>   arch/arm64/boot/dts/qcom/sa8775p.dtsi | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> index 7eab458..ab01efe 100644
>> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
>> @@ -3620,6 +3620,7 @@
>>   				<&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_PCIE_0 0>;
>>   		interconnect-names = "pcie-mem", "cpu-pcie";
>>   
>> +		dma-coherent;
>>   		iommus = <&pcie_smmu 0x0000 0x7f>;
>>   		resets = <&gcc GCC_PCIE_0_BCR>;
>>   		reset-names = "core";
> What tree is this against?
>
> Both controllers are already marked as dma-coherent in mainline so this
> patch makes no sense (and the context also looks wrong).
>
> It was even you added them apparently:
>
> 	489f14be0e0a ("arm64: dts: qcom: sa8775p: Add pcie0 and pcie1 nodes")
>
> Johan
Hi Johan,

Yes both the RC controllers are dma-coherent and this change is for
PCIe EP controller and it is inside pcie0_ep node.
Actually the pcie0_ep node change is yet to apply on linux next.
I just made this change on top of that and the same I mentioned in
cover letter.

https://lore.kernel.org/all/1699669982-7691-6-git-send-email-quic_msarkar@quicinc.com/

Thanks,
Mrinmay