linux-kernel - Re: [PATCH v4 0/7] Convert inno hdmi to drm bridge

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9503607.rMLUfLXkoz@diego>
Date: Sat, 03 May 2025 16:42:04 +0200
From: Heiko Stübner <heiko@...ech.de>
To: Andy Yan <andyshrk@....com>
Cc: conor+dt@...nel.org, krzk+dt@...nel.org, robh@...nel.org,
 hjc@...k-chips.com, mripard@...nel.org, neil.armstrong@...aro.org,
 dmitry.baryshkov@....qualcomm.com, knaerzche@...il.com,
 devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v4 0/7] Convert inno hdmi to drm bridge

Am Dienstag, 22. April 2025, 09:04:39 Mitteleuropäische Sommerzeit schrieb Andy Yan:
> From: Andy Yan <andy.yan@...k-chips.com>
> 
> When preparing to convert the current inno hdmi driver into a
> bridge driver, I found that there are several issues currently
> existing with it:
> 
> 1. When the system starts up, the first time it reads the EDID, it
>    will fail. This is because RK3036 HDMI DDC bus requires it's PHY's
>    reference clock to be enabled first before normal DDC communication
>    can be carried out.
> 
> 2. The signal is unstable. When running the glmark2 test on the screen,
>    there is a small probability of seeing some screen flickering.
>    This is because The HSYNC/VSYNC polarity of rk3036 HDMI are controlled
>    by GRF. This part is missing in the current driver.
> 
> PATCH 1~6 are try to Fix Document in the dt-binding, then add the
> missing part in driver and dts.
> PATCH 7 converts the curren driver to drm bridge mode.

After resurrecting my rk3036-kylin which hasn't sucessfully booted in a
while, I could veryify this series, so on a rk3036-kylin

Tested-by: Heiko Stuebner <heiko@...ech.de>


I'll probably apply patches 1-4 to drm-misc later today, as that solely
touches the Rockchip (and only rk3036-)side and patches 5+6 to the
rockchip tree.

Patch 7 should probably get some attention by people more familiar with
drm-bridges, so I'll let that sit for a bit longer.


Thanks a lot for working on all this
Heiko