drm/fsl-dcu: fix opencoded use of drm_panel_*

Use drm_panel_get_modes() to access modes.
This has a nice side effect to simplify the code.

drm_panel_get_modes() may return a negative value if
for example panel is NULL. This is a small change
compared to before, but really what we want.

v2:
- Add more info to changelog (Stefan)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Cc: Alison Wang <alison.wang@nxp.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190804201637.1240-6-sam@ravnborg.org

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index 279d83e..a92fd6c 100644 (file)
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -65,17 +65,9 @@ static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 {
        struct fsl_dcu_drm_connector *fsl_connector;
-       int (*get_modes)(struct drm_panel *panel);
-       int num_modes = 0;
 
        fsl_connector = to_fsl_dcu_connector(connector);
-       if (fsl_connector->panel && fsl_connector->panel->funcs &&
-           fsl_connector->panel->funcs->get_modes) {
-               get_modes = fsl_connector->panel->funcs->get_modes;
-               num_modes = get_modes(fsl_connector->panel);
-       }
-
-       return num_modes;
+       return drm_panel_get_modes(fsl_connector->panel);
 }
 
 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,