linux-kernel - Re: [PATCH v13 0/6] Add Synopsys DesignWare HDMI RX Controller

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Message-ID: <1039aca7-89b9-44ef-9775-e7852e956362@timsurber.de>
Date: Wed, 5 Mar 2025 01:59:07 +0100
From: Tim Surber <me@...surber.de>
To: Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 Shreeya Patel <shreeya.patel@...labora.com>, Heiko Stuebner
 <heiko@...ech.de>, Mauro Carvalho Chehab <mchehab@...nel.org>,
 Hans Verkuil <hverkuil@...all.nl>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, jose.abreu@...opsys.com, nelson.costa@...opsys.com,
 shawn.wen@...k-chips.com, nicolas.dufresne@...labora.com,
 Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: kernel@...labora.com, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-rockchip@...ts.infradead.org,
 Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Diederik de Haas <didi.debian@...ow.org>
Subject: Re: [PATCH v13 0/6] Add Synopsys DesignWare HDMI RX Controller

Hi Dmitry,

I did some more testing. That the Apple TV did not work was a bit 
misleading.

It was just, that the Apple TV defaulted to 4:4:4 Chroma which does not 
work at all for me. (The same happens using the vendor driver).

When I changed the EDID to match the vendor driver the HDMI handshake 
happened with 4:2:0 chroma, where I could verify even 4k60fps using your 
driver, nice!

So the remaining problems I see are:
- 4:4:4 chroma not working in any resolution
- 4:2:2 and RGB not working in 4k60fps (is this a hardware limitation?)

A possible workaround could be to disable these non supported formats in 
the default EDID.

Best regards,
TIm