linux-kernel - Re: [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property

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Date:   Tue, 21 Mar 2023 17:32:12 +0530
From:   Jayesh Choudhary <j-choudhary@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>,
        <rfoss@...nel.org>, <Laurent.pinchart@...asonboard.com>,
        <jonas@...boo.se>, <jernej.skrabec@...il.com>, <airlied@...il.com>,
        <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <sam@...nborg.org>,
        <jani.nikula@...el.com>, <tzimmermann@...e.de>,
        <javierm@...hat.com>, <ville.syrjala@...ux.intel.com>,
        <r-ravikumar@...com>, <lyude@...hat.com>,
        <alexander.deucher@....com>, <sjakhade@...ence.com>,
        <yamonkar@...ence.com>, <a-bhatia1@...com>
Subject: Re: [PATCH 1/2] dt-bindings: drm/bridge: Add no-hpd property

Hello Krzysztof,

On 17/03/23 18:08, Krzysztof Kozlowski wrote:
> On 16/03/2023 15:08, Jayesh Choudhary wrote:
>> From: Rahul T R <r-ravikumar@...com>
>>
>> Add no-hpd property to the bindings, to disable
>> hpd when not connected or unusable
>>
>> Signed-off-by: Rahul T R <r-ravikumar@...com>
>> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
>> ---
>>   .../devicetree/bindings/display/bridge/cdns,mhdp8546.yaml   | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
>> index b2e8bc6da9d0..69d381195218 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
>> +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8546.yaml
>> @@ -57,6 +57,12 @@ properties:
>>     interrupts:
>>       maxItems: 1
>>   
>> +  cdns,no-hpd:
> 
> There is already no-hpd property.
> 
>> +    type: boolean
>> +    description:
>> +      Set if the HPD line on the bridge isn't hooked up to anything or is
>> +      otherwise unusable.
> 
> It's the property of the panel, not bridge. Unless you want to say that
> bridge physically does not have HPD? Does it follow the standard in such
> case?

MHDP does have hpd. But the mhdp driver should handle the cases when the
hpd pin of bridge is not connected to that of the DP-connector. This is 
to add support for that. (optional property)

-Jayesh


> 
> Best regards,
> Krzysztof
>