drm/bridge: lontium-lt8912b: Do not generate HFP

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>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Link: https://patch.msgid.link/20250728150059.2642055-1-max.oss.09@gmail.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 8a0b48efca5809e161b09bda81f27cf0f54c792b..729b12b67470647e6a772418ea089ff446a6e2a6 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -493,6 +493,7 @@ 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);