Merge tag 'drm-misc-next-2017-08-18' of git://anongit.freedesktop.org/git/drm-misc into drm-next

Cross-subsystem Changes:
- Add tinydrm to MAINTAINERS using -misc tree and Noralf as maintainer (Noralf)

Core Changes:
- Finish dumb_mmap_offset cleanup by removing gem_cma_dumb_map_offset() (Noralf)
- Add gem_framebuffer helper to facilitate removal of fb_cma cargo cult (Noralf)

Driver Changes:
- Various trivial patches

Cc: Noralf Trønnes <noralf@tronnes.org>

* tag 'drm-misc-next-2017-08-18' of git://anongit.freedesktop.org/git/drm-misc:
  drm: udl: constify usb_device_id
  drm/gma500: fix potential NULL pointer dereference dereference
  drm/tinydrm: make function st7586_pipe_enable static
  MAINTAINERS: Add drm/tinydrm maintainer entry
  drm/vc4: Use drm_gem_fb_create()
  drm/pl111: Use drm_gem_fb_create() and drm_gem_fb_prepare_fb()
  drm/fb-cma-helper: Use drm_gem_framebuffer_helper
  drm: Add GEM backed framebuffer library

Documentation/gpu/drm-kms-helpers.rst

@@ -296,3 +296,12 @@ Auxiliary Modeset Helpers
 
 .. kernel-doc:: drivers/gpu/drm/drm_modeset_helper.c
    :export:
+
+Framebuffer GEM Helper Reference
+================================
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/drm_gem_framebuffer_helper.c
+   :export:

MAINTAINERS

@@ -4634,6 +4634,14 @@ F:	drivers/gpu/drm/panel/
 F:	include/drm/drm_panel.h
 F:	Documentation/devicetree/bindings/display/panel/
 
+DRM TINYDRM DRIVERS
+M:	Noralf Trønnes <noralf@tronnes.org>
+W:	https://github.com/notro/tinydrm/wiki/Development
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+S:	Maintained
+F:	drivers/gpu/drm/tinydrm/
+F:	include/drm/tinydrm/
+
 DSBR100 USB FM RADIO DRIVER
 M:	Alexey Klimov <klimov.linux@gmail.com>
 L:	linux-media@vger.kernel.org

drivers/gpu/drm/Makefile

@@ -33,7 +33,7 @@ drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
 		drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
 		drm_kms_helper_common.o drm_dp_dual_mode_helper.o \
 		drm_simple_kms_helper.o drm_modeset_helper.o \
-		drm_scdc_helper.o
+		drm_scdc_helper.o drm_gem_framebuffer_helper.o
 
 drm_kms_helper-$(CONFIG_DRM_PANEL_BRIDGE) += bridge/panel.o
 drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o

drivers/gpu/drm/drm_fb_cma_helper.c

@@ -18,27 +18,17 @@
  */
 
 #include <drm/drmP.h>
-#include <drm/drm_atomic.h>
-#include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
-#include <drm/drm_crtc_helper.h>
+#include <drm/drm_framebuffer.h>
 #include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_fb_cma_helper.h>
-#include <linux/dma-buf.h>
-#include <linux/dma-mapping.h>
 #include <linux/module.h>
-#include <linux/reservation.h>
 
 #define DEFAULT_FBDEFIO_DELAY_MS 50
 
-struct drm_fb_cma {
-	struct drm_framebuffer		fb;
-	struct drm_gem_cma_object	*obj[4];
-};
-
 struct drm_fbdev_cma {
 	struct drm_fb_helper	fb_helper;
-	struct drm_fb_cma	*fb;
 	const struct drm_framebuffer_funcs *fb_funcs;
 };
 
@@ -90,69 +80,19 @@ static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
 	return container_of(helper, struct drm_fbdev_cma, fb_helper);
 }
 
-static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
-{
-	return container_of(fb, struct drm_fb_cma, fb);
-}
-
 void drm_fb_cma_destroy(struct drm_framebuffer *fb)
 {
-	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
-	int i;
-
-	for (i = 0; i < 4; i++) {
-		if (fb_cma->obj[i])
-			drm_gem_object_put_unlocked(&fb_cma->obj[i]->base);
-	}
-
-	drm_framebuffer_cleanup(fb);
-	kfree(fb_cma);
+	drm_gem_fb_destroy(fb);
 }
 EXPORT_SYMBOL(drm_fb_cma_destroy);
 
 int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
 	struct drm_file *file_priv, unsigned int *handle)
 {
-	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
-
-	return drm_gem_handle_create(file_priv,
-			&fb_cma->obj[0]->base, handle);
+	return drm_gem_fb_create_handle(fb, file_priv, handle);
 }
 EXPORT_SYMBOL(drm_fb_cma_create_handle);
 
-static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
-	.destroy	= drm_fb_cma_destroy,
-	.create_handle	= drm_fb_cma_create_handle,
-};
-
-static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
-	const struct drm_mode_fb_cmd2 *mode_cmd,
-	struct drm_gem_cma_object **obj,
-	unsigned int num_planes, const struct drm_framebuffer_funcs *funcs)
-{
-	struct drm_fb_cma *fb_cma;
-	int ret;
-	int i;
-
-	fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
-	if (!fb_cma)
-		return ERR_PTR(-ENOMEM);
-
-	drm_helper_mode_fill_fb_struct(dev, &fb_cma->fb, mode_cmd);
-
-	for (i = 0; i < num_planes; i++)
-		fb_cma->obj[i] = obj[i];
-
-	ret = drm_framebuffer_init(dev, &fb_cma->fb, funcs);
-	if (ret) {
-		dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
-		kfree(fb_cma);
-		return ERR_PTR(ret);
-	}
-
-	return fb_cma;
-}
-
 /**
  * drm_fb_cma_create_with_funcs() - helper function for the
  *                                  &drm_mode_config_funcs.fb_create
@@ -170,53 +110,7 @@ struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
 	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
 	const struct drm_framebuffer_funcs *funcs)
 {
-	const struct drm_format_info *info;
-	struct drm_fb_cma *fb_cma;
-	struct drm_gem_cma_object *objs[4];
-	struct drm_gem_object *obj;
-	int ret;
-	int i;
-
-	info = drm_get_format_info(dev, mode_cmd);
-	if (!info)
-		return ERR_PTR(-EINVAL);
-
-	for (i = 0; i < info->num_planes; i++) {
-		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
-		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
-		unsigned int min_size;
-
-		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
-		if (!obj) {
-			dev_err(dev->dev, "Failed to lookup GEM object\n");
-			ret = -ENOENT;
-			goto err_gem_object_put;
-		}
-
-		min_size = (height - 1) * mode_cmd->pitches[i]
-			 + width * info->cpp[i]
-			 + mode_cmd->offsets[i];
-
-		if (obj->size < min_size) {
-			drm_gem_object_put_unlocked(obj);
-			ret = -EINVAL;
-			goto err_gem_object_put;
-		}
-		objs[i] = to_drm_gem_cma_obj(obj);
-	}
-
-	fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, funcs);
-	if (IS_ERR(fb_cma)) {
-		ret = PTR_ERR(fb_cma);
-		goto err_gem_object_put;
-	}
-
-	return &fb_cma->fb;
-
-err_gem_object_put:
-	for (i--; i >= 0; i--)
-		drm_gem_object_put_unlocked(&objs[i]->base);
-	return ERR_PTR(ret);
+	return drm_gem_fb_create_with_funcs(dev, file_priv, mode_cmd, funcs);
 }
 EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
 
@@ -233,8 +127,7 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
 struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
 	struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
 {
-	return drm_fb_cma_create_with_funcs(dev, file_priv, mode_cmd,
-					    &drm_fb_cma_funcs);
+	return drm_gem_fb_create(dev, file_priv, mode_cmd);
 }
 EXPORT_SYMBOL_GPL(drm_fb_cma_create);
 
@@ -250,12 +143,13 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_create);
 struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
 						  unsigned int plane)
 {
-	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
+	struct drm_gem_object *gem;
 
-	if (plane >= 4)
+	gem = drm_gem_fb_get_obj(fb, plane);
+	if (!gem)
 		return NULL;
 
-	return fb_cma->obj[plane];
+	return to_drm_gem_cma_obj(gem);
 }
 EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
 
@@ -272,13 +166,14 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
 				   struct drm_plane_state *state,
 				   unsigned int plane)
 {
-	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
+	struct drm_gem_cma_object *obj;
 	dma_addr_t paddr;
 
-	if (plane >= 4)
+	obj = drm_fb_cma_get_gem_obj(fb, plane);
+	if (!obj)
 		return 0;
 
-	paddr = fb_cma->obj[plane]->paddr + fb->offsets[plane];
+	paddr = obj->paddr + fb->offsets[plane];
 	paddr += fb->format->cpp[plane] * (state->src_x >> 16);
 	paddr += fb->pitches[plane] * (state->src_y >> 16);
 
@@ -302,26 +197,13 @@ EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
 int drm_fb_cma_prepare_fb(struct drm_plane *plane,
 			  struct drm_plane_state *state)
 {
-	struct dma_buf *dma_buf;
-	struct dma_fence *fence;
-
-	if ((plane->state->fb == state->fb) || !state->fb)
-		return 0;
-
-	dma_buf = drm_fb_cma_get_gem_obj(state->fb, 0)->base.dma_buf;
-	if (dma_buf) {
-		fence = reservation_object_get_excl_rcu(dma_buf->resv);
-		drm_atomic_set_fence_for_plane(state, fence);
-	}
-
-	return 0;
+	return drm_gem_fb_prepare_fb(plane, state);
 }
 EXPORT_SYMBOL_GPL(drm_fb_cma_prepare_fb);
 
 #ifdef CONFIG_DEBUG_FS
 static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
 {
-	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
 	int i;
 
 	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
@@ -330,7 +212,7 @@ static void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
 	for (i = 0; i < fb->format->num_planes; i++) {
 		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 				i, fb->offsets[i], fb->pitches[i]);
-		drm_gem_cma_describe(fb_cma->obj[i], m);
+		drm_gem_cma_describe(drm_fb_cma_get_gem_obj(fb, i), m);
 	}
 }
 
@@ -431,7 +313,6 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
 	struct drm_fb_helper_surface_size *sizes)
 {
 	struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
-	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 	struct drm_device *dev = helper->dev;
 	struct drm_gem_cma_object *obj;
 	struct drm_framebuffer *fb;
@@ -446,14 +327,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
 			sizes->surface_bpp);
 
 	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
-
-	mode_cmd.width = sizes->surface_width;
-	mode_cmd.height = sizes->surface_height;
-	mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
-	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
-		sizes->surface_depth);
-
-	size = mode_cmd.pitches[0] * mode_cmd.height;
+	size = sizes->surface_width * sizes->surface_height * bytes_per_pixel;
 	obj = drm_gem_cma_create(dev, size);
 	if (IS_ERR(obj))
 		return -ENOMEM;
@@ -464,15 +338,14 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
 		goto err_gem_free_object;
 	}
 
-	fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1,
-					 fbdev_cma->fb_funcs);
-	if (IS_ERR(fbdev_cma->fb)) {
+	fb = drm_gem_fbdev_fb_create(dev, sizes, 0, &obj->base,
+				     fbdev_cma->fb_funcs);
+	if (IS_ERR(fb)) {
 		dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
-		ret = PTR_ERR(fbdev_cma->fb);
+		ret = PTR_ERR(fb);
 		goto err_fb_info_destroy;
 	}
 
-	fb = &fbdev_cma->fb->fb;
 	helper->fb = fb;
 
 	fbi->par = helper;
@@ -500,7 +373,7 @@ drm_fbdev_cma_create(struct drm_fb_helper *helper,
 	return 0;
 
 err_cma_destroy:
-	drm_framebuffer_remove(&fbdev_cma->fb->fb);
+	drm_framebuffer_remove(fb);
 err_fb_info_destroy:
 	drm_fb_helper_fini(helper);
 err_gem_free_object:
@@ -570,6 +443,11 @@ struct drm_fbdev_cma *drm_fbdev_cma_init_with_funcs(struct drm_device *dev,
 }
 EXPORT_SYMBOL_GPL(drm_fbdev_cma_init_with_funcs);
 
+static const struct drm_framebuffer_funcs drm_fb_cma_funcs = {
+	.destroy	= drm_gem_fb_destroy,
+	.create_handle	= drm_gem_fb_create_handle,
+};
+
 /**
  * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
  * @dev: DRM device
@@ -597,8 +475,8 @@ void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
 	if (fbdev_cma->fb_helper.fbdev)
 		drm_fbdev_cma_defio_fini(fbdev_cma->fb_helper.fbdev);
 
-	if (fbdev_cma->fb)
-		drm_framebuffer_remove(&fbdev_cma->fb->fb);
+	if (fbdev_cma->fb_helper.fb)
+		drm_framebuffer_remove(fbdev_cma->fb_helper.fb);
 
 	drm_fb_helper_fini(&fbdev_cma->fb_helper);
 	kfree(fbdev_cma);

drivers/gpu/drm/drm_gem_framebuffer_helper.c

+/*
+ * drm gem framebuffer helper functions
+ *
+ * Copyright (C) 2017 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/dma-fence.h>
+#include <linux/reservation.h>
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_modeset_helper.h>
+
+/**
+ * DOC: overview
+ *
+ * This library provides helpers for drivers that don't subclass
+ * &drm_framebuffer and and use &drm_gem_object for their backing storage.
+ *
+ * Drivers without additional needs to validate framebuffers can simply use
+ * drm_gem_fb_create() and everything is wired up automatically. But all
+ * parts can be used individually.
+ */
+
+/**
+ * drm_gem_fb_get_obj() - Get GEM object for framebuffer
+ * @fb: The framebuffer
+ * @plane: Which plane
+ *
+ * Returns the GEM object for given framebuffer.
+ */
+struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
+					  unsigned int plane)
+{
+	if (plane >= 4)
+		return NULL;
+
+	return fb->obj[plane];
+}
+EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj);
+
+static struct drm_framebuffer *
+drm_gem_fb_alloc(struct drm_device *dev,
+		 const struct drm_mode_fb_cmd2 *mode_cmd,
+		 struct drm_gem_object **obj, unsigned int num_planes,
+		 const struct drm_framebuffer_funcs *funcs)
+{
+	struct drm_framebuffer *fb;
+	int ret, i;
+
+	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
+	if (!fb)
+		return ERR_PTR(-ENOMEM);
+
+	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
+
+	for (i = 0; i < num_planes; i++)
+		fb->obj[i] = obj[i];
+
+	ret = drm_framebuffer_init(dev, fb, funcs);
+	if (ret) {
+		DRM_DEV_ERROR(dev->dev, "Failed to init framebuffer: %d\n",
+			      ret);
+		kfree(fb);
+		return ERR_PTR(ret);
+	}
+
+	return fb;
+}
+
+/**
+ * drm_gem_fb_destroy - Free GEM backed framebuffer
+ * @fb: DRM framebuffer
+ *
+ * Frees a GEM backed framebuffer with its backing buffer(s) and the structure
+ * itself. Drivers can use this as their &drm_framebuffer_funcs->destroy
+ * callback.
+ */
+void drm_gem_fb_destroy(struct drm_framebuffer *fb)
+{
+	int i;
+
+	for (i = 0; i < 4; i++)
+		drm_gem_object_put_unlocked(fb->obj[i]);
+
+	drm_framebuffer_cleanup(fb);
+	kfree(fb);
+}
+EXPORT_SYMBOL(drm_gem_fb_destroy);
+
+/**
+ * drm_gem_fb_create_handle - Create handle for GEM backed framebuffer
+ * @fb: DRM framebuffer
+ * @file: drm file
+ * @handle: handle created
+ *
+ * Drivers can use this as their &drm_framebuffer_funcs->create_handle
+ * callback.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
+			     unsigned int *handle)
+{
+	return drm_gem_handle_create(file, fb->obj[0], handle);
+}
+EXPORT_SYMBOL(drm_gem_fb_create_handle);
+
+/**
+ * drm_gem_fb_create_with_funcs() - helper function for the
+ *                                  &drm_mode_config_funcs.fb_create
+ *                                  callback
+ * @dev: DRM device
+ * @file: drm file for the ioctl call
+ * @mode_cmd: metadata from the userspace fb creation request
+ * @funcs: vtable to be used for the new framebuffer object
+ *
+ * This can be used to set &drm_framebuffer_funcs for drivers that need the
+ * &drm_framebuffer_funcs.dirty callback. Use drm_gem_fb_create() if you don't
+ * need to change &drm_framebuffer_funcs.
+ * The function does buffer size validation.
+ */
+struct drm_framebuffer *
+drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
+			     const struct drm_mode_fb_cmd2 *mode_cmd,
+			     const struct drm_framebuffer_funcs *funcs)
+{
+	const struct drm_format_info *info;
+	struct drm_gem_object *objs[4];
+	struct drm_framebuffer *fb;
+	int ret, i;
+
+	info = drm_get_format_info(dev, mode_cmd);
+	if (!info)
+		return ERR_PTR(-EINVAL);
+
+	for (i = 0; i < info->num_planes; i++) {
+		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
+		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
+		unsigned int min_size;
+
+		objs[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
+		if (!objs[i]) {
+			DRM_DEV_ERROR(dev->dev, "Failed to lookup GEM\n");
+			ret = -ENOENT;
+			goto err_gem_object_put;
+		}
+
+		min_size = (height - 1) * mode_cmd->pitches[i]
+			 + width * info->cpp[i]
+			 + mode_cmd->offsets[i];
+
+		if (objs[i]->size < min_size) {
+			drm_gem_object_put_unlocked(objs[i]);
+			ret = -EINVAL;
+			goto err_gem_object_put;
+		}
+	}
+
+	fb = drm_gem_fb_alloc(dev, mode_cmd, objs, i, funcs);
+	if (IS_ERR(fb)) {
+		ret = PTR_ERR(fb);
+		goto err_gem_object_put;
+	}
+
+	return fb;
+
+err_gem_object_put:
+	for (i--; i >= 0; i--)
+		drm_gem_object_put_unlocked(objs[i]);
+
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs);
+
+static const struct drm_framebuffer_funcs drm_gem_fb_funcs = {
+	.destroy	= drm_gem_fb_destroy,
+	.create_handle	= drm_gem_fb_create_handle,
+};
+
+/**
+ * drm_gem_fb_create() - &drm_mode_config_funcs.fb_create callback function
+ * @dev: DRM device
+ * @file: drm file for the ioctl call
+ * @mode_cmd: metadata from the userspace fb creation request
+ *
+ * If your hardware has special alignment or pitch requirements these should be
+ * checked before calling this function. The function does buffer size
+ * validation. Use drm_gem_fb_create_with_funcs() if you need to set
+ * &drm_framebuffer_funcs.dirty.
+ */
+struct drm_framebuffer *
+drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
+		  const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	return drm_gem_fb_create_with_funcs(dev, file, mode_cmd,
+					    &drm_gem_fb_funcs);
+}
+EXPORT_SYMBOL_GPL(drm_gem_fb_create);
+
+/**
+ * drm_gem_fb_prepare_fb() - Prepare gem framebuffer
+ * @plane: Which plane
+ * @state: Plane state attach fence to
+ *
+ * This can be used as the &drm_plane_helper_funcs.prepare_fb hook.
+ *
+ * This function checks if the plane FB has an dma-buf attached, extracts
+ * the exclusive fence and attaches it to plane state for the atomic helper
+ * to wait on.
+ *
+ * There is no need for &drm_plane_helper_funcs.cleanup_fb hook for simple
+ * gem based framebuffer drivers which have their buffers always pinned in
+ * memory.
+ */
+int drm_gem_fb_prepare_fb(struct drm_plane *plane,
+			  struct drm_plane_state *state)
+{
+	struct dma_buf *dma_buf;
+	struct dma_fence *fence;
+
+	if ((plane->state->fb == state->fb) || !state->fb)
+		return 0;
+
+	dma_buf = drm_gem_fb_get_obj(state->fb, 0)->dma_buf;
+	if (dma_buf) {
+		fence = reservation_object_get_excl_rcu(dma_buf->resv);
+		drm_atomic_set_fence_for_plane(state, fence);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_fb_prepare_fb);
+
+/**
+ * drm_gem_fbdev_fb_create - Create a drm_framebuffer for fbdev emulation
+ * @dev: DRM device
+ * @sizes: fbdev size description
+ * @pitch_align: optional pitch alignment
+ * @obj: GEM object backing the framebuffer
+ * @funcs: vtable to be used for the new framebuffer object
+ *
+ * This function creates a framebuffer for use with fbdev emulation.
+ *
+ * Returns:
+ * Pointer to a drm_framebuffer on success or an error pointer on failure.
+ */
+struct drm_framebuffer *
+drm_gem_fbdev_fb_create(struct drm_device *dev,
+			struct drm_fb_helper_surface_size *sizes,
+			unsigned int pitch_align, struct drm_gem_object *obj,
+			const struct drm_framebuffer_funcs *funcs)
+{
+	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = sizes->surface_width *
+			      DIV_ROUND_UP(sizes->surface_bpp, 8);
+	if (pitch_align)
+		mode_cmd.pitches[0] = roundup(mode_cmd.pitches[0],
+					      pitch_align);
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+							sizes->surface_depth);
+	if (obj->size < mode_cmd.pitches[0] * mode_cmd.height)
+		return ERR_PTR(-EINVAL);
+
+	return drm_gem_fb_alloc(dev, &mode_cmd, &obj, 1, funcs);
+}
+EXPORT_SYMBOL(drm_gem_fbdev_fb_create);

drivers/gpu/drm/gma500/mdfld_dsi_pkg_sender.c

@@ -520,7 +520,7 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type,
 			u8 *data, u16 len, u32 *data_out, u16 len_out, bool hs)
 {
 	unsigned long flags;
-	struct drm_device *dev = sender->dev;
+	struct drm_device *dev;
 	int i;
 	u32 gen_data_reg;
 	int retry = MDFLD_DSI_READ_MAX_COUNT;
@@ -530,6 +530,8 @@ static int __read_panel_data(struct mdfld_dsi_pkg_sender *sender, u8 data_type,
 		return -EINVAL;
 	}
 
+	dev = sender->dev;
+
 	/**
 	 * do reading.
 	 * 0) send out generic read request

drivers/gpu/drm/pl111/pl111_display.c

@@ -23,6 +23,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 
 #include "pl111_drm.h"
@@ -274,7 +275,7 @@ void pl111_disable_vblank(struct drm_device *drm, unsigned int crtc)
 static int pl111_display_prepare_fb(struct drm_simple_display_pipe *pipe,
 				    struct drm_plane_state *plane_state)
 {
-	return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
+	return drm_gem_fb_prepare_fb(&pipe->plane, plane_state);
 }
 
 static const struct drm_simple_display_pipe_funcs pl111_display_funcs = {

drivers/gpu/drm/pl111/pl111_drv.c

@@ -66,6 +66,7 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 
 #include "pl111_drm.h"
@@ -73,7 +74,7 @@
 #define DRIVER_DESC      "DRM module for PL111"
 
 static const struct drm_mode_config_funcs mode_config_funcs = {
-	.fb_create = drm_fb_cma_create,
+	.fb_create = drm_gem_fb_create,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };

drivers/gpu/drm/tinydrm/st7586.c

@@ -172,8 +172,8 @@ static const struct drm_framebuffer_funcs st7586_fb_funcs = {
 	.dirty		= st7586_fb_dirty,
 };
 
-void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
-			struct drm_crtc_state *crtc_state)
+static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
+			       struct drm_crtc_state *crtc_state)
 {
 	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
 	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);

drivers/gpu/drm/udl/udl_drv.c

@@ -111,7 +111,7 @@ static void udl_usb_disconnect(struct usb_interface *interface)
  * which is compatible with all known USB 2.0 era graphics chips and firmware,
  * but allows DisplayLink to increment those for any future incompatible chips
  */
-static struct usb_device_id id_table[] = {
+static const struct usb_device_id id_table[] = {
 	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 	 .bInterfaceSubClass = 0x00,
 	 .bInterfaceProtocol = 0x00,

drivers/gpu/drm/vc4/vc4_kms.c

@@ -20,6 +20,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include "vc4_drv.h"
 
 static void vc4_output_poll_changed(struct drm_device *dev)
@@ -189,7 +190,7 @@ static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev,
 		mode_cmd = &mode_cmd_local;
 	}
 
-	return drm_fb_cma_create(dev, file_priv, mode_cmd);
+	return drm_gem_fb_create(dev, file_priv, mode_cmd);
 }
 
 static const struct drm_mode_config_funcs vc4_mode_funcs = {

include/drm/drm_framebuffer.h

@@ -190,6 +190,13 @@ struct drm_framebuffer {
 	 * @filp_head: Placed on &drm_file.fbs, protected by &drm_file.fbs_lock.
 	 */
 	struct list_head filp_head;
+	/**
+	 * @obj: GEM objects backing the framebuffer, one per plane (optional).
+	 *
+	 * This is used by the GEM framebuffer helpers, see e.g.
+	 * drm_gem_fb_create().
+	 */
+	struct drm_gem_object *obj[4];
 };
 
 #define obj_to_fb(x) container_of(x, struct drm_framebuffer, base)

include/drm/drm_gem_framebuffer_helper.h

+#ifndef __DRM_GEM_FB_HELPER_H__
+#define __DRM_GEM_FB_HELPER_H__
+
+struct drm_device;
+struct drm_file;
+struct drm_fb_helper_surface_size;
+struct drm_framebuffer;
+struct drm_framebuffer_funcs;
+struct drm_gem_object;
+struct drm_mode_fb_cmd2;
+struct drm_plane;
+struct drm_plane_state;
+
+struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb,
+					  unsigned int plane);
+void drm_gem_fb_destroy(struct drm_framebuffer *fb);
+int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file,
+			     unsigned int *handle);
+
+struct drm_framebuffer *
+drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file,
+			     const struct drm_mode_fb_cmd2 *mode_cmd,
+			     const struct drm_framebuffer_funcs *funcs);
+struct drm_framebuffer *
+drm_gem_fb_create(struct drm_device *dev, struct drm_file *file,
+		  const struct drm_mode_fb_cmd2 *mode_cmd);
+
+int drm_gem_fb_prepare_fb(struct drm_plane *plane,
+			  struct drm_plane_state *state);
+
+struct drm_framebuffer *
+drm_gem_fbdev_fb_create(struct drm_device *dev,
+			struct drm_fb_helper_surface_size *sizes,
+			unsigned int pitch_align, struct drm_gem_object *obj,
+			const struct drm_framebuffer_funcs *funcs);
+
+#endif