linux-kernel - Re: [PATCH v2 2/3] drm/bridge: lt9611: Add support for single Port B input

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Message-ID: <xlo7l73dzj2eah4skge2pc2uo7lnoqfyikeekazyrklnybdab2@37tlfbz2zqiw>
Date: Thu, 29 Jan 2026 02:47:42 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
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>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Roger Shimizu <rosh@...ian.org>
Subject: Re: [PATCH v2 2/3] drm/bridge: lt9611: Add support for single Port B
 input

On Wed, Jan 28, 2026 at 07:15:46PM +0800, Hongyang Zhao wrote:
> The LT9611 has two DSI input ports. The driver currently assumes Port A
> is always used for single-port configurations. However, some boards
> connect DSI to Port B only.
> 
> Update the driver to detect which ports are populated from devicetree
> and configure the hardware accordingly:
> 
> - If only port@1 (Port B) is populated, configure port swap (0x8303
>   bit 6) and byte_clk source (0x8250 bit 3:2) for Port B operation
> - If both ports are populated, use dual-port mode (Port A + B)
> - If only port@0 (Port A) is populated, use single Port A (existing
>   behavior)
> 
> Signed-off-by: Hongyang Zhao <hongyang.zhao@...ndersoft.com>
> Reviewed-by: Roger Shimizu <rosh@...ian.org>
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611.c | 46 +++++++++++++++++++++++----------
>  1 file changed, 32 insertions(+), 14 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry