linux-kernel - Re: [PATCH 7/7] drm/bridge: tc358768: Add support for long command tx via video buffer

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Message-ID: <20251219111716.GG39796@francesco-nb>
Date: Fri, 19 Dec 2025 12:17:16 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.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>,
	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>,
	Parth Pancholi <parth.pancholi@...adex.com>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] drm/bridge: tc358768: Add support for long command
 tx via video buffer

On Tue, Oct 21, 2025 at 04:23:03PM +0300, Tomi Valkeinen wrote:
> TC358768 has two ways to send DSI commands: 1) buffer the payload data
> into registers (DSICMD_WDx), which supports up to 8 bytes of payload, 2)
> buffer the payload data into the video buffer, which supports up to 1024
> bytes of payload.
> 
> The driver currently supports method 1).
> 
> Add support for transmitting long DSI commands (more than 8 bytes, up to
> 1024 bytes) using the video buffer. This mode can only be used before
> the actual video transmission is enabled, i.e. the initial configuration.
> 
> Original version from Parth Pancholi <parth.pancholi@...adex.com>
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Francesco Dolcini <francesco.dolcini@...adex.com>