linux-kernel - Re: [PATCH v8 3/8] arm64: dts: imx8mp-hummingboard-pulse: fix mini-hdmi dsi port reference

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c87d6af5-f2b9-4a4d-bfcf-431c84e06601@solid-run.com>
Date: Thu, 29 Jan 2026 10:58:40 +0000
From: Josua Mayer <josua@...id-run.com>
To: Frank Li <Frank.li@....com>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha
 Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Mikhail Anikin
	<mikhail.anikin@...id-run.com>, Yazan Shhady <yazan.shhady@...id-run.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v8 3/8] arm64: dts: imx8mp-hummingboard-pulse: fix
 mini-hdmi dsi port reference

On 28/01/2026 19:13, Frank Li wrote:
> On Wed, Jan 28, 2026 at 06:21:27PM +0200, Josua Mayer wrote:
>> imx8mp.dtsi includes a default port@1 node with an empty placeholder
>> endpoint intended for linking to a dsi bridge or panel.
>>
>> HummingBoard Pulse mini-hdmi dtsi added and linked hdmi bridge to yet
>> another endpoint.
>>
>> This duplicate endpoint can cause dsi_attach to fail.
> Can you add descript about why duplicate endpoint cause fail?

I didn't debug this in detail. Basic observation was as follows:

I was under the impression that two endpoint nodes ended up in the final 
dtb,
with different phandles which made the remote-endpoint references 
inconsistent.

I'd prefer not to explain in detail what happened, and focus on removing
inconsistency from the dts.

>
> Frank
>> Remove the duplicate node and link to the one defined in soc dtsi.
>> Further remove the unnecessary attach-bridge property.
>>
>> Fixes: 2a222aa2bee9 ("arm64: dts: add description for solidrun imx8mp hummingboard variants")
>> Signed-off-by: Josua Mayer <josua@...id-run.com>
>> ---
>>   .../dts/freescale/imx8mp-hummingboard-pulse-mini-hdmi.dtsi    | 11 ++++-------
>>   1 file changed, 4 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-pulse-mini-hdmi.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-pulse-mini-hdmi.dtsi
>> index 46916ddc0533..0e5f4607c7c1 100644
>> --- a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-pulse-mini-hdmi.dtsi
>> +++ b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-pulse-mini-hdmi.dtsi
>> @@ -41,7 +41,7 @@ port@0 {
>>   				reg = <0>;
>>
>>   				adv7535_from_dsim: endpoint {
>> -					remote-endpoint = <&dsim_to_adv7535>;
>> +					remote-endpoint = <&mipi_dsi_out>;
>>   				};
>>   			};
>>
>> @@ -71,11 +71,8 @@ &lcdif1 {
>>   &mipi_dsi {
>>   	samsung,esc-clock-frequency = <10000000>;
>>   	status = "okay";
>> +};
>>
>> -	port@1 {
>> -		dsim_to_adv7535: endpoint {
>> -			remote-endpoint = <&adv7535_from_dsim>;
>> -			attach-bridge;
>> -		};
>> -	};
>> +&mipi_dsi_out {
>> +	remote-endpoint = <&adv7535_from_dsim>;
>>   };
>>
>> --
>> 2.43.0
>>
>>