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From 942d55434af46aebe8f5508995807253a6b235b3 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 31 Mar 2022 12:05:04 +0100
Subject: [PATCH] drm/panel: panel-ilitek9881c: Add
prepare_prev_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_prev_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>
---
drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -1131,6 +1131,7 @@ static int ili9881c_dsi_probe(struct mip
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);
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