linux-kernel - Re: [PATCH] arm64: dts: imx8mp: Enable HDMI on i.MX8MP DHCOM PDK2 and PDK3

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Message-ID: <76b3cee8-1fe3-4192-b8c9-7a9c2b7165f0@denx.de>
Date: Thu, 16 May 2024 13:14:04 +0200
From: Marek Vasut <marex@...x.de>
To: Francesco Dolcini <francesco@...cini.it>
Cc: linux-arm-kernel@...ts.infradead.org, Conor Dooley <conor+dt@...nel.org>,
 Fabio Estevam <festevam@...il.com>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Pengutronix Kernel Team <kernel@...gutronix.de>,
 Rob Herring <robh@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
 Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, kernel@...electronics.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mp: Enable HDMI on i.MX8MP DHCOM PDK2 and
 PDK3

On 5/16/24 10:00 AM, Francesco Dolcini wrote:
> Hello Marek,

Hi,

> On Tue, May 14, 2024 at 03:06:42AM +0200, Marek Vasut wrote:
>> Enable HDMI output on i.MX8MP DHCOM PDK2 and PDK3. The I2C5 on PDK2 and
>> I2C mux port 1 on PDK3 respectively are used in regular I2C mode instead
>> of HDMI DDC mode to permit connection of other I2C devices on those buses.
> 
> Are you able to read the HDMI EDID with such configuration? I have the
> patch ready for verdin imx8mp, I just did not have time to figure out
> this last details.

Yes with ddc-i2c-bus in hdmi_tx{} node, no with ddc-i2c-bus in connector 
node. Maybe that's what you're running into ? The DW HDMI core needs the 
ddc-i2c-bus property in hdmi_tx{} node if you use non-native I2C bus for 
the DDC channel.