linux-kernel - Re: [PATCH v3 5/5] arm64: dts: qcom: sm8450: add dp controller

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Message-ID: <b43179c4-bbf5-1d38-6ff0-8ddd0356d6d1@linaro.org>
Date:   Mon, 13 Feb 2023 13:32:54 +0100
From:   neil.armstrong@...aro.org
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] arm64: dts: qcom: sm8450: add dp controller

On 10/02/2023 16:54, Dmitry Baryshkov wrote:
> On 10/02/2023 17:28, Neil Armstrong wrote:
>> On 10/02/2023 16:24, Dmitry Baryshkov wrote:
>>> On 10/02/2023 16:44, Neil Armstrong wrote:
>>>> Add the Display Port controller subnode to the MDSS node.
>>>>
>>>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>>>> ---
>>>>   arch/arm64/boot/dts/qcom/sm8450.dtsi | 79 ++++++++++++++++++++++++++++++++++++
>>>>   1 file changed, 79 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>>>> index 6caa2c8efb46..72d54beb7d7c 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>>>> @@ -2751,6 +2751,13 @@ dpu_intf2_out: endpoint {
>>>>                           };
>>>>                       };
>>>> +                    port@2 {
>>>> +                        reg = <2>;
>>>> +                        dpu_intf0_out: endpoint {
>>>> +                            remote-endpoint = <&mdss_dp0_in>;
>>>> +                        };
>>>> +                    };
>>>> +
>>>>                   };
>>>>                   mdp_opp_table: opp-table {
>>>> @@ -2783,6 +2790,78 @@ opp-500000000 {
>>>>                   };
>>>>               };
>>>> +            mdss_dp0: displayport-controller@...0000 {
>>>> +                compatible = "qcom,sm8350-dp";
>>
>> Exact, must fix.
>>
>>>
>>> Missing "qcom,sm8450-dp". As I wrote in the comment to patch 1, I'd suggest having just a single entry here rather than keeping both 8350 and 8450 entries.
>>>
>>>> +                reg = <0 0xae90000 0 0xfc>,
>>>> +                      <0 0xae90200 0 0xc0>,
>>>> +                      <0 0xae90400 0 0x770>,
>>>> +                      <0 0xae91000 0 0x98>,
>>>> +                      <0 0xae91400 0 0x98>;
>>>
>>>
>>> While this sounds correct, usually we used the even size here (0x200, 0x400, etc.). Can we please switch to it (especially since sm8350-dp uses even sizes).
>>
>> I don't have access to registers layout for HDK8450 but the system freezes when using even sizes, using
>> the exact register size works fine.
> 
> Interesting. Could you please trace, what exactly makes it fail, since specifying bigger region size should not cause such issues.

Yep I'll trace what's happening.

Neil

>