linux-kernel - Re: [PATCH v3 0/3] Add DSI Port B input support for LT9611 HDMI bridge

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Message-ID: <CAEQ9gE=9xV7i3afybmWvE+W9aLgYWSo1X=gC4cWRMkTJYBLo3A@mail.gmail.com>
Date: Sun, 8 Feb 2026 00:43:52 -0800
From: Roger Shimizu <rosh@...ian.org>
To: Hongyang Zhao <hongyang.zhao@...ndersoft.com>
Cc: 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>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
	Christopher Obbard <christopher.obbard@...aro.org>, dri-devel@...ts.freedesktop.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v3 0/3] Add DSI Port B input support for LT9611 HDMI bridge

On Fri, Feb 6, 2026 at 11:33 PM Hongyang Zhao
<hongyang.zhao@...ndersoft.com> wrote:
>
> The LT9611 HDMI bridge has two DSI input ports (Port A and Port B).
> The current driver only supports Port A or dual-port (A+B) mode, but
> some boards like RubikPi3 connect DSI to Port B only.
>
> This series adds support for using DSI Port B as the input source by
> utilizing the existing ports mechanism in devicetree:
>
> - port@0 corresponds to LT9611 DSI Port A input
> - port@1 corresponds to LT9611 DSI Port B input
>
> The driver detects which ports are populated and configures the hardware
> accordingly. When only port@1 is present, it configures port swap
> (register 0x8303 bit 6) and byte_clk source (register 0x8250 bit 3:2)
> for Port B operation.
>
> Signed-off-by: Hongyang Zhao <hongyang.zhao@...ndersoft.com>
> ---
> Changes in v3:
> - v2 incorporates significant changes based on Neil's review of v1,
>   so remove Roger’s Reviewed-by tag from the v2 commit message.
> - Link to v2: https://patch.msgid.link/20260128-rubikpi-next-20260116-v2-0-ba51ce8d2bd2@thundersoft.com
>
> Changes in v2:
> - Use ports mechanism instead of boolean property
> - port@0 corresponds to LT9611 Port A, port@1 to Port B
> - Driver detects which port is populated and configures accordingly
> - Link to v1: https://lore.kernel.org/r/20260127-rubikpi-next-20260116-v1-0-0286c75150c5@thundersoft.com
>
> ---
> Hongyang Zhao (3):
>       dt-bindings: display: lt9611: Support single Port B input
>       drm/bridge: lt9611: Add support for single Port B input
>       arm64: dts: qcom: qcs6490-rubikpi3: Use lt9611 DSI Port B
>
>  .../bindings/display/bridge/lontium,lt9611.yaml    | 15 +++++--
>  .../boot/dts/qcom/qcs6490-thundercomm-rubikpi3.dts |  8 ++--
>  drivers/gpu/drm/bridge/lontium-lt9611.c            | 46 +++++++++++++++-------
>  3 files changed, 47 insertions(+), 22 deletions(-)
> ---
> base-commit: 46fe65a2c28ecf5df1a7475aba1f08ccf4c0ac1b
> change-id: 20260127-rubikpi-next-20260116-99c1dbea50e4

Reviewed-by: Roger Shimizu <rosh@...ian.org>
Tested-by: Roger Shimizu <rosh@...ian.org>

-Roger