* [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP
@ 2025-07-28 15:00 max.oss.09
2025-09-11 15:34 ` Francesco Dolcini
0 siblings, 1 reply; 3+ messages in thread
From: max.oss.09 @ 2025-07-28 15:00 UTC (permalink / raw)
To: Max Krummenacher
Cc: Adrien Grassein, Andrzej Hajda, David Airlie, Jernej Skrabec,
Jonas Karlman, Laurent Pinchart, Maarten Lankhorst, Maxime Ripard,
Neil Armstrong, Robert Foss, Simona Vetter, Thomas Zimmermann,
dri-devel, linux-kernel
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP
2025-07-28 15:00 [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP max.oss.09
@ 2025-09-11 15:34 ` Francesco Dolcini
2025-10-27 10:14 ` Max Krummenacher
0 siblings, 1 reply; 3+ messages in thread
From: Francesco Dolcini @ 2025-09-11 15:34 UTC (permalink / raw)
To: max.oss.09
Cc: Max Krummenacher, Adrien Grassein, Andrzej Hajda, David Airlie,
Jernej Skrabec, Jonas Karlman, Laurent Pinchart,
Maarten Lankhorst, Maxime Ripard, Neil Armstrong, Robert Foss,
Simona Vetter, Thomas Zimmermann, dri-devel, linux-kernel
Hello all,
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>
Just a gently ping on this
Francesco
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP
2025-09-11 15:34 ` Francesco Dolcini
@ 2025-10-27 10:14 ` Max Krummenacher
0 siblings, 0 replies; 3+ messages in thread
From: Max Krummenacher @ 2025-10-27 10:14 UTC (permalink / raw)
To: Francesco Dolcini
Cc: Max Krummenacher, Adrien Grassein, Andrzej Hajda, David Airlie,
Jernej Skrabec, Jonas Karlman, Laurent Pinchart,
Maarten Lankhorst, Maxime Ripard, Neil Armstrong, Robert Foss,
Simona Vetter, Thomas Zimmermann, dri-devel, linux-kernel
On Thu, Sep 11, 2025 at 05:34:53PM +0200, Francesco Dolcini wrote:
> Hello all,
>
> 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>
>
> Just a gently ping on this
Any opinion on this?
Max
>
> Francesco
^ permalink raw reply [flat|nested] 3+ messages in thread
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2025-07-28 15:00 [PATCH] drm/bridge: lontium-lt8912b: Do not generate HFP max.oss.09
2025-09-11 15:34 ` Francesco Dolcini
2025-10-27 10:14 ` Max Krummenacher
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