drm/panel: panel-ilitek9881c: Add prepare_upstream_first flag

The panel sends MIPI DCS commands during prepare and is expecting
the bus to remain in LP-11 state in-between.

Set the prepare_upstream_first flag so that the upstream DSI host
is prepared / pre_enabled first, and therefore the bus is in a
defined state.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index e4e3cbbc157ff940d8ecc583320dfd30e163ca2f..b994f9604a17416d5fcdccda365e25f0ac30779a 100644 (file)
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -1315,6 +1315,7 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
        ctx->dsi = dsi;
        ctx->desc = of_device_get_match_data(&dsi->dev);
 
+       ctx->panel.prepare_prev_first = true;
        drm_panel_init(&ctx->panel, &dsi->dev, &ili9881c_funcs,
                       DRM_MODE_CONNECTOR_DSI);