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

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Date: Thu, 06 Jun 2024 00:16:35 +0200
From: Heiko Stübner <heiko@...ech.de>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Sandy Huang <hjc@...k-chips.com>, Andy Yan <andy.yan@...k-chips.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Mark Yao <markyao0591@...il.com>,
 Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
 Luis de Arquer <ldearquer@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 devicetree@...r.kernel.org, kernel@...labora.com,
 Alexandre ARNOUD <aarnoud@...com>, Algea Cao <algea.cao@...k-chips.com>
Subject:
 Re: [PATCH 13/14] drm/bridge: synopsys: Add DW HDMI QP TX controller driver

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.