drm/sun4i: Use drm_fb_cma_fbdev_init/fini()

Use drm_fb_cma_fbdev_init() and drm_fb_cma_fbdev_fini() which relies on
the fact that drm_device holds a pointer to the drm_fb_helper structure.
This means that the driver doesn't have to keep track of that.
Also use the drm_fb_helper functions directly.

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115142001.45358-15-noralf@tronnes.org
diff --git a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
index 2992f0a..38a36c0 100644
--- a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
@@ -11,6 +11,7 @@
  */
 
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drmP.h>
@@ -18,21 +19,14 @@
 #include "sun4i_drv.h"
 #include "sun4i_framebuffer.h"
 
-static void sun4i_de_output_poll_changed(struct drm_device *drm)
-{
-	struct sun4i_drv *drv = drm->dev_private;
-
-	drm_fbdev_cma_hotplug_event(drv->fbdev);
-}
-
 static const struct drm_mode_config_funcs sun4i_de_mode_config_funcs = {
-	.output_poll_changed	= sun4i_de_output_poll_changed,
+	.output_poll_changed	= drm_fb_helper_output_poll_changed,
 	.atomic_check		= drm_atomic_helper_check,
 	.atomic_commit		= drm_atomic_helper_commit,
 	.fb_create		= drm_gem_fb_create,
 };
 
-struct drm_fbdev_cma *sun4i_framebuffer_init(struct drm_device *drm)
+int sun4i_framebuffer_init(struct drm_device *drm)
 {
 	drm_mode_config_reset(drm);
 
@@ -41,12 +35,10 @@ struct drm_fbdev_cma *sun4i_framebuffer_init(struct drm_device *drm)
 
 	drm->mode_config.funcs = &sun4i_de_mode_config_funcs;
 
-	return drm_fbdev_cma_init(drm, 32, drm->mode_config.num_connector);
+	return drm_fb_cma_fbdev_init(drm, 32, 0);
 }
 
 void sun4i_framebuffer_free(struct drm_device *drm)
 {
-	struct sun4i_drv *drv = drm->dev_private;
-
-	drm_fbdev_cma_fini(drv->fbdev);
+	drm_fb_cma_fbdev_fini(drm);
 }