Enable the drm panel prepare_prev_first flag for k101_im2byl02 panel so-that the previous controller should be prepared first before the prepare for the panel is called. This makes sure that the previous controller(sun6i-mipi-dsi), likely to be a DSI host controller should be initialized to LP-11 before the panel is powered up. Cc: Icenowy Zheng <icenowy@xxxxxxx> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> --- Changes for v7: - new patch drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c index 1ec696adf9de..102a1df0cea0 100644 --- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c @@ -42,6 +42,7 @@ struct ili9881c_desc { const size_t init_length; const struct drm_display_mode *mode; const unsigned long mode_flags; + bool prepare_prev_first; }; struct ili9881c { @@ -891,6 +892,7 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi) drm_panel_init(&ctx->panel, &dsi->dev, &ili9881c_funcs, DRM_MODE_CONNECTOR_DSI); + ctx->panel.prepare_prev_first = ctx->desc->prepare_prev_first; ctx->power = devm_regulator_get(&dsi->dev, "power"); if (IS_ERR(ctx->power)) @@ -942,6 +944,7 @@ static const struct ili9881c_desc k101_im2byl02_desc = { .init_length = ARRAY_SIZE(k101_im2byl02_init), .mode = &k101_im2byl02_default_mode, .mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE, + .prepare_prev_first = true, }; static const struct ili9881c_desc w552946aba_desc = { -- 2.25.1