drm/fb_cma_helper: Use new drm_fb_helper functions

Use the newly created wrapper drm_fb_helper functions instead of calling
core fbdev functions directly. They also simplify the fb_info creation.

Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_fb_cma_helper.c

@@ -222,9 +222,9 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
 
 static struct fb_ops drm_fbdev_cma_ops = {
 	.owner		= THIS_MODULE,
-	.fb_fillrect	= sys_fillrect,
-	.fb_copyarea	= sys_copyarea,
-	.fb_imageblit	= sys_imageblit,
+	.fb_fillrect	= drm_fb_helper_sys_fillrect,
+	.fb_copyarea	= drm_fb_helper_sys_copyarea,
+	.fb_imageblit	= drm_fb_helper_sys_imageblit,
 	.fb_check_var	= drm_fb_helper_check_var,
 	.fb_set_par	= drm_fb_helper_set_par,
 	.fb_blank	= drm_fb_helper_blank,
@@ -263,10 +263,9 @@ static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
 	if (IS_ERR(obj))
 		return -ENOMEM;
 
-	fbi = framebuffer_alloc(0, dev->dev);
-	if (!fbi) {
-		dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
-		ret = -ENOMEM;
+	fbi = drm_fb_helper_alloc_fbi(helper);
+	if (IS_ERR(fbi)) {
+		ret = PTR_ERR(fbi);
 		goto err_drm_gem_cma_free_object;
 	}
 
@@ -274,23 +273,16 @@ static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
 	if (IS_ERR(fbdev_cma->fb)) {
 		dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
 		ret = PTR_ERR(fbdev_cma->fb);
-		goto err_framebuffer_release;
+		goto err_fb_info_destroy;
 	}
 
 	fb = &fbdev_cma->fb->fb;
 	helper->fb = fb;
-	helper->fbdev = fbi;
 
 	fbi->par = helper;
 	fbi->flags = FBINFO_FLAG_DEFAULT;
 	fbi->fbops = &drm_fbdev_cma_ops;
 
-	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
-	if (ret) {
-		dev_err(dev->dev, "Failed to allocate color map.\n");
-		goto err_drm_fb_cma_destroy;
-	}
-
 	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 
@@ -305,11 +297,8 @@ static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
 
 	return 0;
 
-err_drm_fb_cma_destroy:
-	drm_framebuffer_unregister_private(fb);
-	drm_fb_cma_destroy(fb);
-err_framebuffer_release:
-	framebuffer_release(fbi);
+err_fb_info_destroy:
+	drm_fb_helper_release_fbi(helper);
 err_drm_gem_cma_free_object:
 	drm_gem_cma_free_object(&obj->base);
 	return ret;
@@ -385,20 +374,8 @@ EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
  */
 void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
 {
-	if (fbdev_cma->fb_helper.fbdev) {
-		struct fb_info *info;
-		int ret;
-
-		info = fbdev_cma->fb_helper.fbdev;
-		ret = unregister_framebuffer(info);
-		if (ret < 0)
-			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
-
-		if (info->cmap.len)
-			fb_dealloc_cmap(&info->cmap);
-
-		framebuffer_release(info);
-	}
+	drm_fb_helper_unregister_fbi(&fbdev_cma->fb_helper);
+	drm_fb_helper_release_fbi(&fbdev_cma->fb_helper);
 
 	if (fbdev_cma->fb) {
 		drm_framebuffer_unregister_private(&fbdev_cma->fb->fb);