Re: [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP

[Francesco Dolcini <francesco@dolcini.it>]

+Dmitry, Luca

Hello all,
how to get this patch considered and eventually merged? I see that this
is not moving since long.

Considering that Adrien Grassein is not visible on the mailing list
since 2022, and that I have various HW available that is using this
combination (on TI Sitara and Jacinto, on a DPI-DSI tc358768 bridge,
and NXP i.MX), I have access to the (little) documentation that is
available from Lontium I can propose myself as a maintainer here.

I assume being able to ack patches would help the maintenance here, or
is this just a glitch and a ping was enough?

Dmitry, Luca: looking at the recent commits you are the one who merged
the most patches on drivers/gpu/drm/bridge lately, what's you advise?

Francesco

On Mon, Jul 28, 2025 at 05:00:50PM +0200, max.oss.09@gmail.com wrote:
> From: Max Krummenacher <max.krummenacher@toradex.com>
> 
> The datasheet of lontium-lt8912b doesn't require blanking during
> the HFP period. Thus use LP during HFP.
> 
> Tested with a samsung-dsim (i.MX8 MM) and a tc358768 DPI to DSI bridge
> as the DSI host.
> 
> Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
> 
> ---
> 
>  drivers/gpu/drm/bridge/lontium-lt8912b.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
> index 3e49d855b364..760d89493276 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
> @@ -494,6 +494,7 @@ static int lt8912_attach_dsi(struct lt8912 *lt)
>  
>  	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
>  			  MIPI_DSI_MODE_LPM |
> +			  MIPI_DSI_MODE_VIDEO_NO_HFP |
>  			  MIPI_DSI_MODE_NO_EOT_PACKET;
>  
>  	ret = devm_mipi_dsi_attach(dev, dsi);
> -- 
> 2.42.0
>