drm/fbdev-ttm: Remove obsolete setup function

The old setup function drm_fbdev_ttm_setup() is unused. Remove it and
its internal callbacks. New drivers should call drm_client_setup()
instead.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240924071734.98201-73-tzimmermann@suse.de

Author: tdz

drivers/gpu/drm/drm_fbdev_ttm.c

@@ -65,15 +65,6 @@ static const struct fb_ops drm_fbdev_ttm_fb_ops = {
 	.fb_destroy	= drm_fbdev_ttm_fb_destroy,
 };
 
-/*
- * This function uses the client API to create a framebuffer backed by a dumb buffer.
- */
-static int drm_fbdev_ttm_helper_fb_probe(struct drm_fb_helper *fb_helper,
-					     struct drm_fb_helper_surface_size *sizes)
-{
-	return drm_fbdev_ttm_driver_fbdev_probe(fb_helper, sizes);
-}
-
 static void drm_fbdev_ttm_damage_blit_real(struct drm_fb_helper *fb_helper,
 					   struct drm_clip_rect *clip,
 					   struct iosys_map *dst)
@@ -172,7 +163,6 @@ static int drm_fbdev_ttm_helper_fb_dirty(struct drm_fb_helper *helper,
 }
 
 static const struct drm_fb_helper_funcs drm_fbdev_ttm_helper_funcs = {
-	.fb_probe = drm_fbdev_ttm_helper_fb_probe,
 	.fb_dirty = drm_fbdev_ttm_helper_fb_dirty,
 };
 
@@ -251,112 +241,3 @@ int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
 	return ret;
 }
 EXPORT_SYMBOL(drm_fbdev_ttm_driver_fbdev_probe);
-
-static void drm_fbdev_ttm_client_unregister(struct drm_client_dev *client)
-{
-	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
-
-	if (fb_helper->info) {
-		drm_fb_helper_unregister_info(fb_helper);
-	} else {
-		drm_client_release(&fb_helper->client);
-		drm_fb_helper_unprepare(fb_helper);
-		kfree(fb_helper);
-	}
-}
-
-static int drm_fbdev_ttm_client_restore(struct drm_client_dev *client)
-{
-	drm_fb_helper_lastclose(client->dev);
-
-	return 0;
-}
-
-static int drm_fbdev_ttm_client_hotplug(struct drm_client_dev *client)
-{
-	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
-	struct drm_device *dev = client->dev;
-	int ret;
-
-	if (dev->fb_helper)
-		return drm_fb_helper_hotplug_event(dev->fb_helper);
-
-	ret = drm_fb_helper_init(dev, fb_helper);
-	if (ret)
-		goto err_drm_err;
-
-	if (!drm_drv_uses_atomic_modeset(dev))
-		drm_helper_disable_unused_functions(dev);
-
-	ret = drm_fb_helper_initial_config(fb_helper);
-	if (ret)
-		goto err_drm_fb_helper_fini;
-
-	return 0;
-
-err_drm_fb_helper_fini:
-	drm_fb_helper_fini(fb_helper);
-err_drm_err:
-	drm_err(dev, "fbdev: Failed to setup emulation (ret=%d)\n", ret);
-	return ret;
-}
-
-static const struct drm_client_funcs drm_fbdev_ttm_client_funcs = {
-	.owner		= THIS_MODULE,
-	.unregister	= drm_fbdev_ttm_client_unregister,
-	.restore	= drm_fbdev_ttm_client_restore,
-	.hotplug	= drm_fbdev_ttm_client_hotplug,
-};
-
-/**
- * drm_fbdev_ttm_setup() - Setup fbdev emulation for TTM-based drivers
- * @dev: DRM device
- * @preferred_bpp: Preferred bits per pixel for the device.
- *
- * This function sets up fbdev emulation for TTM-based drivers that support
- * dumb buffers with a virtual address and that can be mmap'ed.
- * drm_fbdev_ttm_setup() shall be called after the DRM driver registered
- * the new DRM device with drm_dev_register().
- *
- * Restore, hotplug events and teardown are all taken care of. Drivers that do
- * suspend/resume need to call drm_fb_helper_set_suspend_unlocked() themselves.
- * Simple drivers might use drm_mode_config_helper_suspend().
- *
- * In order to provide fixed mmap-able memory ranges, fbdev emulation
- * uses a shadow buffer in system memory. The implementation blits the shadow
- * fbdev buffer onto the real buffer in regular intervals.
- *
- * This function is safe to call even when there are no connectors present.
- * Setup will be retried on the next hotplug event.
- *
- * The fbdev is destroyed by drm_dev_unregister().
- */
-void drm_fbdev_ttm_setup(struct drm_device *dev, unsigned int preferred_bpp)
-{
-	struct drm_fb_helper *fb_helper;
-	int ret;
-
-	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
-	drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
-
-	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
-	if (!fb_helper)
-		return;
-	drm_fb_helper_prepare(dev, fb_helper, preferred_bpp, &drm_fbdev_ttm_helper_funcs);
-
-	ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_ttm_client_funcs);
-	if (ret) {
-		drm_err(dev, "Failed to register client: %d\n", ret);
-		goto err_drm_client_init;
-	}
-
-	drm_client_register(&fb_helper->client);
-
-	return;
-
-err_drm_client_init:
-	drm_fb_helper_unprepare(fb_helper);
-	kfree(fb_helper);
-	return;
-}
-EXPORT_SYMBOL(drm_fbdev_ttm_setup);

include/drm/drm_fbdev_ttm.h

@@ -5,7 +5,6 @@
 
 #include <linux/stddef.h>
 
-struct drm_device;
 struct drm_fb_helper;
 struct drm_fb_helper_surface_size;
 
@@ -15,14 +14,9 @@ int drm_fbdev_ttm_driver_fbdev_probe(struct drm_fb_helper *fb_helper,
 
 #define DRM_FBDEV_TTM_DRIVER_OPS \
 	.fbdev_probe = drm_fbdev_ttm_driver_fbdev_probe
-
-void drm_fbdev_ttm_setup(struct drm_device *dev, unsigned int preferred_bpp);
 #else
 #define DRM_FBDEV_TTM_DRIVER_OPS \
 	.fbdev_probe = NULL
-
-static inline void drm_fbdev_ttm_setup(struct drm_device *dev, unsigned int preferred_bpp)
-{ }
 #endif
 
 #endif