linux-kernel - Re: [PATCH] dt-bindings: display: bridge: ti,sn65dsi83: add burst-mode-disabled

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Message-ID: <223b287f-4da6-4ec1-be7c-6135215c5551@denx.de>
Date: Tue, 9 Jul 2024 17:00:55 +0200
From: Marek Vasut <marex@...x.de>
To: Stefano Radaelli <stefano.radaelli21@...il.com>
Cc: "Rob Herring (Arm)" <robh@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Andrzej Hajda <andrzej.hajda@...el.com>,
 Thomas Zimmermann <tzimmermann@...e.de>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 David Airlie <airlied@...il.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Maxime Ripard <mripard@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>, devicetree@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
 "Noah J . Rosa" <noahj.rosa@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: display: bridge: ti,sn65dsi83: add
 burst-mode-disabled

On 7/9/24 4:44 PM, Stefano Radaelli wrote:
> Hi Marek,

Hi,

> Actually this property is specific also to DSI8x bridge, as you can see
> from the screenshot below taken from official datasheet:
> 
> [image: image.png]
> 
> And it's the sn65dsi8x driver that tells MIPI driver which flags to use
> during attachment.

There are other bridges and panels which support both DSI burst and 
sync-pulse/sync-events modes, so a property which selects the mode is 
generic, not specific to this particular bridge . The bridge driver 
could parse such generic property, although it would be better if the 
core code parsed it instead.

> So, for example, this bridge can work also for MIPI interfaces which don't
> support burst-mode.
> Also, as a value-added benefit, I found non-burst mode better for some
> 1920x1200 LVDS panels I'm testing (Of course with more energy consumption).
> That's why I though it could be useful have this option, since SN65DSI8x
> supports both modes.

Can you share which panel model this is ?