linux-kernel - Re: [PATCH v4 5/9] drm/bridge: add a driver for T-Head TH1520 HDMI controller

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Message-ID: <2776792.KRxA6XjA2N@diego>
Date: Sun, 28 Dec 2025 18:41:06 +0100
From: Heiko Stübner <heiko@...ech.de>
To: Andy Yan <andyshrk@....com>, Icenowy Zheng <zhengxingda@...as.ac.cn>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Drew Fustini <fustini@...nel.org>,
 Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 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>,
 Michal Wilczynski <m.wilczynski@...sung.com>, devicetree@...r.kernel.org,
 Yao Zi <ziyao@...root.org>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, Han Gao <rabenda.cn@...il.com>,
 linux-riscv@...ts.infradead.org
Subject:
 Re: [PATCH v4 5/9] drm/bridge: add a driver for T-Head TH1520 HDMI controller

Am Samstag, 27. Dezember 2025, 08:22:05 Mitteleuropäische Normalzeit schrieb Icenowy Zheng:
> 在 2025-12-27星期六的 15:03 +0800，Andy Yan写道：
> > 
> > 
> > Hello，
> > 
> > 在 2025-12-26 21:27:53，"Icenowy Zheng" <zhengxingda@...as.ac.cn> 写道：
> > > 在 2025-12-25星期四的 19:07 +0800，Andy Yan写道：
> > > > 
> > > > 
> > > > Hello Icenowy:
> > > > 
> > > > At 2025-12-25 00:12:01, "Icenowy Zheng" <zhengxingda@...as.ac.cn>
> > > > wrote:
> > > > > From: Icenowy Zheng <uwu@...nowy.me>
> > > > > 
> > > > > T-Head TH1520 SoC contains a Synopsys DesignWare HDMI
> > > > > controller
> > > > > (paired
> > > > > with DesignWare HDMI TX PHY Gen2) that takes the "DP" output
> > > > > from
> > > > > the
> > > > > display controller.
> > > > > 
> > > > > Add a driver for this controller utilizing the common
> > > > > DesignWare
> > > > > HDMI
> > > > > code in the kernel.
> > > > > 
> > > > > Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
> > > > > Signed-off-by: Icenowy Zheng <zhengxingda@...as.ac.cn>
> > > > > ---
> > > > > No changes in v3, v4.
> > > > > 
> > > > > Changes in v2:
> > > > > - Created a new function to set PHY parameters and refactored
> > > > > the
> > > > >  control flow of the configure_phy callback.
> > > > > 
> > > > > MAINTAINERS                             |   1 +
> > > > > drivers/gpu/drm/bridge/Kconfig          |  10 ++
> > > > > drivers/gpu/drm/bridge/Makefile         |   1 +
> > > > > drivers/gpu/drm/bridge/th1520-dw-hdmi.c | 173
> > > > > ++++++++++++++++++++++++
> > > > > 4 files changed, 185 insertions(+)
> > > > > create mode 100644 drivers/gpu/drm/bridge/th1520-dw-hdmi.c
> > > > 
> > > > 
> > > > As this is a Synopsys DesignWare based IP, maybe it's better to
> > > > put
> > > > it under   "drivers/gpu/drm/bridge/synopsys/"
> > > > Or just create a dir for thead, I think there will come other
> > > > display
> > > > related drivers for thead in the future.
> > > 
> > > It's not proper to place vendor glues to synopsys/ .
> > 
> > 
> > TI has precedents for doing this with Cadence IP， see 
> > 
> > drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.c
> > drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c 
> 
> Well for this kind of things, I prefer to hear from the maintainer of
> DW HDMI bridges (although it seems that this has no dedicated
> MAINTAINERS entry and get_maintainers just returns people for DRM
> DRIVERS FOR BRIDGE CHIPS).

I think the best way to resolve this question would be to actively ask
on the dri-devel IRC channel (on the OFTC network), because people
might not even realize this quite interesting question is in here, but
I guess most of the relevant people are on there.

But probably wait after new years, so people can actually return from
all the festivities happening right now.


Heiko