linux-kernel - Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Use 'edp

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Message-ID: <e7ff4fa3-7885-48f1-8b0b-66d677147e41@oss.qualcomm.com>
Date: Thu, 6 Nov 2025 11:24:45 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Amit Singh <quic_amitsi@...cinc.com>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_riteshk@...cinc.com,
        quic_rajeevny@...cinc.com, quic_vproddut@...cinc.com
Subject: Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Use 'edp_hot' function
 for hpd gpio

On 11/6/25 9:23 AM, Amit Singh wrote:
> 
> 
> On 10/31/2025 2:37 PM, Konrad Dybcio wrote:
>> On 10/31/25 9:57 AM, Amit Singh wrote:
>>> Currently, hpd gpio is configured as a general-purpose gpio, which does
>>> not support interrupt generation. This change removes the generic
>>> hpd-gpios property and assigns the edp_hot function to the pin,
>>> enabling proper irq support.
>>>
>>> Fixes: 756efb7cb7293 ("arm64: dts: qcom: qcs6490-rb3gen2: Add DP output")
>>> Signed-off-by: Amit Singh <quic_amitsi@...cinc.com>
>>> ---
>>>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 3 ---
>>>  1 file changed, 3 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>>> index c146161e4bb4..caa0b6784df3 100644
>>> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>>> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
>>> @@ -49,8 +49,6 @@ dp-connector {
>>>  		label = "DP";
>>>  		type = "mini";
>>>  
>>> -		hpd-gpios = <&tlmm 60 GPIO_ACTIVE_HIGH>;
>>
>> I think this change will take away DRM_BRIDGE_OP_DETECT which is very
>> much desired to have.. (via display_connector_probe())
>>
>> Konrad
> 
> Yes, this change will indeed remove DRM_BRIDGE_OP_DETECT.
> We'll be relying on the internal HPD line (edp_hot) that's directly connected to the DP controller instead.
> 
> Do you foresee any specific issues with this approach?

No, looks like I was overly cautious

Konrad