linux-kernel - Re: [PATCH] drm/mediatek: mtk_dsi: Add support for High Speed (HS) mode

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Message-ID: <aV_bl8c3tMpih9s_@owl5>
Date: Thu, 8 Jan 2026 17:30:15 +0100
From: Gary Bisson <bisson.gary@...il.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...il.com,
	simona@...ll.ch, matthias.bgg@...il.com,
	dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel@...labora.com
Subject: Re: [PATCH] drm/mediatek: mtk_dsi: Add support for High Speed (HS)
 mode

On Thu, Jan 08, 2026 at 11:19:59AM +0100, AngeloGioacchino Del Regno wrote:
> Up until now, the MediaTek DSI Controller has always been working
> in Low Power Mode (LPM), as this driver has always ignored the
> MIPI_DSI_MSG_USE_LPM flag hence never setting HS mode.
> 
> In the current state of the driver the only thing that is needed
> to add support for DSI High Speed (HS) transmit is to simply set
> the "HSTX" config bit in the configuration register.
> 
> Check if flag MIPI_DSI_MSG_USE_LPM is set and, if not, set HSTX.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Tested-by: Gary Bisson <bisson.gary@...il.com>

This patch was needed for the TI SN65DSI83 DSI to LVDS bridge to work as
it requires HS mode.

Regards,
Gary