linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sa8775p-ride: Enable Display Port

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Message-ID: <fad3508a-bb02-4162-8803-fba5de25e752@quicinc.com>
Date: Tue, 29 Oct 2024 11:38:49 +0530
From: Soutrik Mukhopadhyay <quic_mukhopad@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <andersson@...nel.org>, <konradybcio@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_riteshk@...cinc.com>,
        <quic_vproddut@...cinc.com>, <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sa8775p-ride: Enable Display
 Port


On 10/28/2024 3:15 PM, Dmitry Baryshkov wrote:
> On Mon, 28 Oct 2024 at 10:49, Soutrik Mukhopadhyay
> <quic_mukhopad@...cinc.com> wrote:
>>
>> On 10/8/2024 5:46 PM, Dmitry Baryshkov wrote:
>>> On Tue, Oct 08, 2024 at 04:55:16PM GMT, Soutrik Mukhopadhyay wrote:
>>>> Enable DPTX0 and DPTX1 along with their corresponding PHYs for
>>>> sa8775p-ride platform.
>>> What is connected to those DP lanes? If they are routed directly to the
>>> DisplayPort connectors, please add corresponding devices (see
>>> dp-connector).
>>
>> We are defining the functionality of gpio101 and gpio102 as "edp0_hot"
>> and "edp1_hot"
>>
>> respectively. This ensures that the hot plug will be directly routed via
>> the display interrupt
>>
>> line "mdss0" to the display port driver and no external dependencies on
>> dp-connector is
>>
>> necessary.
> Please describe the hardware, not the driver necessities.
> If the board has a DP connector, please add the node. E.g. it allows
> one to specify the label and the type used by the connector.
>
> Also could you please fix your email client so that you don't have
> strange/unnecessary line wraps and empty lines?

Addition of DP connector node with the hpd-gpio property does not allow 
hpd to be detected since the gpio

101/102 have the "edp0_hot" as function. If the hpd-gpio property is 
removed from the DP connector node,

the probe of DP connector will fail.


>