drm/sun4i: Clear encoder->bridge if a bridge is not found

The KMS helpers (drm_atomic_helper_check_modeset/mode_fixup) pass
encoder->bridge directly to drm_bridge_mode_fixup, which expects a
valid pointer, or NULL (in which case it just returns).

Clear encoder->bridge if a bridge is not found, instead of keeping
the ERR_PTR value.

Since other drm_bridge functions also follow this pattern of checking
for a non-NULL pointer, we can drop the ifs around the calls and just
pass the pointer directly.

Fixes: 894f5a9f4b4a ("drm/sun4i: Add bridge support")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
index c076979..bc6eef2 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
+++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
@@ -156,8 +156,8 @@ static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
                drm_panel_enable(tcon->panel);
        }
 
-       if (!IS_ERR(encoder->bridge))
-               drm_bridge_enable(encoder->bridge);
+       /* encoder->bridge can be NULL; drm_bridge_enable checks for it */
+       drm_bridge_enable(encoder->bridge);
 
        sun4i_tcon_channel_enable(tcon, 0);
 }
@@ -172,8 +172,8 @@ static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
 
        sun4i_tcon_channel_disable(tcon, 0);
 
-       if (!IS_ERR(encoder->bridge))
-               drm_bridge_disable(encoder->bridge);
+       /* encoder->bridge can be NULL; drm_bridge_disable checks for it */
+       drm_bridge_disable(encoder->bridge);
 
        if (!IS_ERR(tcon->panel)) {
                drm_panel_disable(tcon->panel);
@@ -278,6 +278,8 @@ int sun4i_rgb_init(struct drm_device *drm)
                        dev_err(drm->dev, "Couldn't attach our bridge\n");
                        goto err_cleanup_connector;
                }
+       } else {
+               encoder->bridge = NULL;
        }
 
        return 0;