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

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Date: Thu, 16 May 2024 13:57:43 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Marek Vasut <marex@...x.de>
Cc: Francesco Dolcini <francesco@...cini.it>,
	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

Hello,

On Thu, May 16, 2024 at 01:14:04PM +0200, Marek Vasut wrote:
> On 5/16/24 10:00 AM, Francesco Dolcini wrote:
> > 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.

Yes, that's it. Thanks!

Francesco