linux-kernel - Re: [PATCH 3/3] arch: arm64: dts: sm8650-hdk: add support for the Display Card overlay

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Date: Mon, 11 Mar 2024 15:29:34 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arch: arm64: dts: sm8650-hdk: add support for the
 Display Card overlay

On 03/03/2024 00:32, Vladimir Zapolskiy wrote:
> Hi Neil,
> 
> On 2/23/24 10:52, Neil Armstrong wrote:
>> With the SM8650-HDK, a Display Card kit can be connected to provide
>> a VTDR6130 display with Goodix Berlin Touch controller.
>>
>> In order to route the DSI lanes to the connector for the Display
>> Card kit, a switch must be changed on the board.
>>
>> The HDMI nodes are disabled since the DSI lanes are shared with
>> the DSI to HDMI transceiver.
>>
>> Add support for this card as an overlay and apply it it at
>> build-time to the sm8650-hdk dtb.
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
> 
> <snip>
> 
>> +    mdp_vsync_active: mdp-vsync-active-state {
>> +        pins = "gpio86";
>> +        function = "mdp_vsync";
>> +        drive-strength = <2>;
>> +        bias-pull-down;
>> +    };
>> +
>> +    mdp_vsync_suspend: mdp-vsync-suspend-state {
>> +        pins = "gpio86";
>> +        function = "mdp_vsync";
>> +        drive-strength = <2>;
>> +        bias-pull-down;
>> +    };
> 
> If you have a single pin configuration for active and suspend states,
> then likely you may have only one device tree node here.
> 
> Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
> 
> I don't add my Tested-by tag, since I don't get a panel working on 6.8.0-rc6,
> while in runtime MSM and DSI are enabled, the panel driver is not initialized:
> 
>    panel-visionox-vtdr6130 ae94000.dsi.0: Failed to initialize panel: -22

This is unrelated to to the HDK, it requires this:
https://lore.kernel.org/all/20240201-visionox-vtdr-prev-first-v2-1-32db52867624@quicinc.com/
that has been applied fr next release.

Thanks,

Neil

> 
> -- 
> Best wishes,
> Vladimir