drm/sun4i: rgb: add missing calls to drm_panel_{prepare,unprepare}

If the enable-gpios property of a simple panel in device tree is set,
the GPIO is not toggled on/off because of missing calls to
drm_panel_prepare and drm_panel_unprepare.

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
index d4e52522ec53..c07697902ab1 100644
--- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
+++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
@@ -151,8 +151,10 @@ static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
 
         DRM_DEBUG_DRIVER("Enabling RGB output\n");
 
-        if (!IS_ERR(tcon->panel))
+        if (!IS_ERR(tcon->panel)) {
+                drm_panel_prepare(tcon->panel);
                 drm_panel_enable(tcon->panel);
+        }
 
         if (!IS_ERR(encoder->bridge))
                 drm_bridge_enable(encoder->bridge);
@@ -173,8 +175,10 @@ static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
         if (!IS_ERR(encoder->bridge))
                 drm_bridge_disable(encoder->bridge);
 
-        if (!IS_ERR(tcon->panel))
+        if (!IS_ERR(tcon->panel)) {
                 drm_panel_disable(tcon->panel);
+                drm_panel_unprepare(tcon->panel);
+        }
 }
 
 static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,