drm/rockchip: dw-mipi-dsi: defer probe if panel is not loaded

This ensures that the output resolution is known before fbcon loads.
mipi_dsi_host_register() is moved above dw_mipi_dsi_register() to
simplify error cleanup since the order of these operations does not
matter.

Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170224125506.21533-22-john@metanate.com

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 60dfb56..9edb868 100644 (file)
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -1189,12 +1189,27 @@ static int dw_mipi_dsi_bind(struct device *dev, struct device *master,
                goto err_pllref;
        }
 
-       dev_set_drvdata(dev, dsi);
-
        dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
        dsi->dsi_host.dev = dev;
-       return mipi_dsi_host_register(&dsi->dsi_host);
+       ret = mipi_dsi_host_register(&dsi->dsi_host);
+       if (ret) {
+               dev_err(dev, "Failed to register MIPI host: %d\n", ret);
+               goto err_cleanup;
+       }
+
+       if (!dsi->panel) {
+               ret = -EPROBE_DEFER;
+               goto err_mipi_dsi_host;
+       }
 
+       dev_set_drvdata(dev, dsi);
+       return 0;
+
+err_mipi_dsi_host:
+       mipi_dsi_host_unregister(&dsi->dsi_host);
+err_cleanup:
+       drm_encoder_cleanup(&dsi->encoder);
+       drm_connector_cleanup(&dsi->connector);
 err_pllref:
        clk_disable_unprepare(dsi->pllref_clk);
        return ret;