[PATCH 04/12] drm/exynos: add non-panel path to exynos_dsi_enable()

[Maciej Purski]

As DSIM can now have a bridge connected as a peripheral, it should be
possible to successfully enable exynos_dsi, when there is no panel
provided.

Signed-off-by: Maciej Purski <m.purski@xxxxxxxxxxx>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 8957faf..7d92e50 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1382,27 +1382,26 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	if (dsi->state & DSIM_STATE_ENABLED)
 		return;
 
-	pm_runtime_get_sync(dsi->dev);
-
-	dsi->state |= DSIM_STATE_ENABLED;
-
-	ret = drm_panel_prepare(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_prepare(dsi->panel);
+		if (ret < 0) {
+			return;
+		}
 	}
 
 	exynos_dsi_set_display_mode(dsi);
 	exynos_dsi_set_display_enable(dsi, true);
 
-	ret = drm_panel_enable(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		exynos_dsi_set_display_enable(dsi, false);
-		drm_panel_unprepare(dsi->panel);
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_enable(dsi->panel);
+		if (ret < 0) {
+			exynos_dsi_set_display_enable(dsi, false);
+			drm_panel_unprepare(dsi->panel);
+			return;
+		}
 	}
 
+	dsi->state |= DSIM_STATE_ENABLED;
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
 }
 
-- 
2.7.4