linux-kernel - Re:Re:Re: [PATCH v6 09/10] arm64: dts: rockchip: Enable DisplayPort for rk3588s Cool Pi 4B

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Message-ID: <6c84556c.29cb.1985e658afb.Coremail.andyshrk@163.com>
Date: Thu, 31 Jul 2025 10:52:49 +0800 (CST)
From: "Andy Yan" <andyshrk@....com>
To: "Sebastian Reichel" <sebastian.reichel@...labora.com>
Cc: dmitry.baryshkov@....qualcomm.com, neil.armstrong@...aro.org,
	heiko@...ech.de, stephen@...xa.com, dri-devel@...ts.freedesktop.org,
	hjc@...k-chips.com, mripard@...nel.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
	yubing.zhang@...k-chips.com, naoki@...xa.com,
	Laurent.pinchart@...asonboard.com,
	"Andy Yan" <andy.yan@...k-chips.com>, krzk+dt@...nel.org,
	robh@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re:Re:Re: [PATCH v6 09/10] arm64: dts: rockchip: Enable DisplayPort
 for rk3588s Cool Pi 4B


Hello Sebastian，

在 2025-07-30 20:15:44，"Andy Yan" <andyshrk@....com> 写道：
>
>
>Hello Sebastian，
>
>At 2025-07-30 01:09:41, "Sebastian Reichel" <sebastian.reichel@...labora.com> wrote:
>>Hi,
>>
>>On Mon, Jul 28, 2025 at 04:28:34PM +0800, Andy Yan wrote:
>>> From: Andy Yan <andy.yan@...k-chips.com>
>>> 
>>> Enable the Mini DisplayPort on this board.
>>> Note that ROCKCHIP_VOP2_EP_DP0 is defined as 10 in dt-binding header,
>>> but it will trigger a dtc warning like "graph node unit address error,
>>> expected "a"" if we use it directly after endpoint, so we use "a"
>>> instead here.
>>> 
>>> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
>>> ---
>>
>>The graph currently looks like this:
>>
>>VOP <-> DP controller <-> DP Connector
>>
>>IIUIC this does not work for USB-C and needs to look like this,
>>because the USBDP PHY handles the lane muxing and thus must be
>>the thing connected to the USB-C controller/connector:
>
>I previously tests USB-C Altmode on Linux 5.15 using Rock 5b,  this function works well. 
>However, when the same dts configuration is used on Linux 6.16 and tested with Rock 5b in USB-C Altmode, 
>the HPD interrupt of DP cannot be triggered. I'm not sure yet what changes have occurred between them.
>Moreover, I noticed that on your test branch[1], the DTS configuration has also changed compared to before.
>I would greatly appreciate it if you could share some details.

Some updates:
      After comment out pd-version(Your previous DTS didn't include this property.) on linux 6.16[2]
     //pd-revision = /bits/ 8 <0x2 0x0 0x1 0x2>;
    The USB-C Alt Mode output can work as before。
    I still have relatively limited knowledge about USB-C, so I hope to hear more of your opinions.


>
>
>
>[0]https://github.com/andyshrk/linux/commit/b9f87a562d431fb59b664b7aed41869a8f184de3
>[1]https://gitlab.collabora.com/hardware-enablement/rockchip-3588/linux/-/commit/0e7e90494482cf77d5bb058a47583b6747b140f4
  [2]https://github.com/andyshrk/linux/tree/rk3588-dp-upstream-v6

>>
>>VOP <-> DP controller <-> USBDP PHY <-> USB-C Connector
>>
>>I wonder if the simple case not involving USB-C should also have
>>the USBDP PHY described in the graph as a transparent bridge?
>>Note, that the USBDP PHY DT binding is currently not ready for
>>this (this also affects the next patch, but should be enough to
>>discuss this once :)).
>>
>>Greetings,
>>
>>-- Sebastian
>>
>>> 
>>> (no changes since v2)
>>> 
>>> Changes in v2:
>>> - Sort in alphabetical order
>>> 
>>>  .../boot/dts/rockchip/rk3588s-coolpi-4b.dts   | 37 +++++++++++++++++++
>>>  1 file changed, 37 insertions(+)
>>> 
>>> diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-coolpi-4b.dts b/arch/arm64/boot/dts/rockchip/rk3588s-coolpi-4b.dts
>>> index 8b717c4017a46..5393c6cc493c3 100644
>>> --- a/arch/arm64/boot/dts/rockchip/rk3588s-coolpi-4b.dts
>>> +++ b/arch/arm64/boot/dts/rockchip/rk3588s-coolpi-4b.dts
>>> @@ -39,6 +39,18 @@ chosen {
>>>  		stdout-path = "serial2:1500000n8";
>>>  	};
>>>  
>>> +	dp-con {
>>> +		compatible = "dp-connector";
>>> +		label = "DP OUT";
>>> +		type = "mini";
>>> +
>>> +		port {
>>> +			dp_con_in: endpoint {
>>> +				remote-endpoint = <&dp0_out_con>;
>>> +			};
>>> +		};
>>> +	};
>>> +
>>>  	hdmi-con {
>>>  		compatible = "hdmi-connector";
>>>  		type = "d";
>>> @@ -215,6 +227,24 @@ &cpu_b2 {
>>>  	cpu-supply = <&vdd_cpu_big1_s0>;
>>>  };
>>>  
>>> +&dp0 {
>>> +	status = "okay";
>>> +	pinctrl-0 = <&dp0m0_pins>;
>>> +	pinctrl-names = "default";
>>> +};
>>> +
>>> +&dp0_in {
>>> +	dp0_in_vp2: endpoint {
>>> +		remote-endpoint = <&vp2_out_dp0>;
>>> +	};
>>> +};
>>> +
>>> +&dp0_out {
>>> +	dp0_out_con: endpoint {
>>> +		remote-endpoint = <&dp_con_in>;
>>> +	};
>>> +};
>>> +
>>>  &gpu {
>>>  	mali-supply = <&vdd_gpu_s0>;
>>>  	status = "okay";
>>> @@ -889,3 +919,10 @@ vp0_out_hdmi0: endpoint@...KCHIP_VOP2_EP_HDMI0 {
>>>  		remote-endpoint = <&hdmi0_in_vp0>;
>>>  	};
>>>  };
>>> +
>>> +&vp2 {
>>> +	vp2_out_dp0: endpoint@a {
>>> +		reg = <ROCKCHIP_VOP2_EP_DP0>;
>>> +		remote-endpoint = <&dp0_in_vp2>;
>>> +	};
>>> +};
>>> -- 
>>> 2.43.0
>>> 
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