[PATCH] drm/panel: enable prepare_prev_first for BOE tv101wum

[Daniel Fuchs]

After commit 9e15123eca79 ("drm/msm/dsi: Stop unconditionally
powering up DSI hosts at modeset"), the host DSI bridge can no
longer be assumed to be available. Enable prepare_prev_first for
the panel to ensure the DSI bridge is ready before panel init.

Fixes display on the IdeaPad Duet 3 (wormdingler).

Suggested-by: Marijn Suijten <marijn.suij...@somainline.org>
Signed-off-by: Daniel Fuchs <softw...@sagacioussuricata.com>

diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c 
b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
index c4c0f08e9202..82f4313adbc4 100644
--- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
@@ -1873,6 +1873,7 @@ static int boe_panel_add(struct boe_panel *boe)
 
        drm_panel_init(&boe->base, dev, &boe_panel_funcs,
                       DRM_MODE_CONNECTOR_DSI);
+       boe->base.prepare_prev_first = true;
        err = of_drm_get_panel_orientation(dev->of_node, &boe->orientation);
        if (err < 0) {
                dev_err(dev, "%pOF: failed to get orientation %d\n", 
dev->of_node, err);