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 --- Changes since v2:

- Add comments stating encoder->bridge can be NULL and drm_bridge_* functions check for it. - Move clearing of encoder->bridge to if-else block of bridge setup --- drivers/gpu/drm/sun4i/sun4i_rgb.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c index d4e52522ec53..d69847b243af 100644 --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c @@ -154,8 +154,8 @@ static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder) if (!IS_ERR(tcon->panel)) 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); } @@ -170,8 +170,8 @@ 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); @@ -274,6 +274,8 @@ 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;