Re: [PATCH 13/14] drm/bridge: synopsys: Add DW HDMI QP TX controller driver

From: "Heiko Stübner" <heiko@sntech.de>
To: Andrzej Hajda <andrzej.hajda@intel.com>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Robert Foss <rfoss@kernel.org>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Sandy Huang <hjc@rock-chips.com>,
	Andy Yan <andy.yan@rock-chips.com>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Mark Yao <markyao0591@gmail.com>,
	Cristian Ciocaltea <cristian.ciocaltea@collabora.com>,
	Luis de Arquer <ldearquer@gmail.com>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
	kernel@collabora.com, Alexandre ARNOUD <aarnoud@me.com>,
	Algea Cao <algea.cao@rock-chips.com>
Subject: Re: [PATCH 13/14] drm/bridge: synopsys: Add DW HDMI QP TX controller driver
Date: Thu, 06 Jun 2024 00:16:35 +0200	[thread overview]
Message-ID: <2827569.XrmoMso0CX@diego> (raw)
In-Reply-To: <02e22411-e22e-41f7-8bca-95c8ef5a4346@gmail.com>

Am Mittwoch, 5. Juni 2024, 21:58:23 CEST schrieb Luis de Arquer:
> On 6/5/24 16:48, Heiko Stübner wrote:
> > Without this change, connecting to a DVI display does not work, and
> > reading the EDID ends in the "i2c read error" below.
> 
> I had a lot of problems initially with the vendor driver on my DVI 
> display, and am aware that several changes were required.
> 
> However, I tested Cristian patch and worked fine. All modes were 
> apparently detected from the display and they all worked. But maybe I 
> was just lucky and it was using a somehow cached table, I can't say.
> 
> This is an AOC DVI display from 2011 with a passive adapter.

For me it is an LG IPS235. On its native hdmi input I always get regular
1080p output. But on its DVI input I always ran into the i2c read error
before adding that change.

I guess I should determine which reads actually fail.

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