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

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Date:   Mon, 13 Feb 2023 14:56:05 +0100
From:   Neil Armstrong <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 13/02/2023 13:32, neil.armstrong@...aro.org wrote:
> 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.

OK weird, I tried with the same sizes as sm8350, and it works fine.

Will resend with this fixed.

Neil

> 
> Neil
> 
>>
>