diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e7e9242..44c3421 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -29,6 +29,7 @@
  *      Dave Airlie <airlied@linux.ie>
  *      Jesse Barnes <jesse.barnes@intel.com>
  */
+#include <linux/ctype.h>
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/export.h>
@@ -91,7 +92,7 @@
 
 /* Avoid boilerplate.  I'm tired of typing. */
 #define DRM_ENUM_NAME_FN(fnname, list)				\
-	char *fnname(int val)					\
+	const char *fnname(int val)				\
 	{							\
 		int i;						\
 		for (i = 0; i < ARRAY_SIZE(list); i++) {	\
@@ -104,7 +105,7 @@
 /*
  * Global properties
  */
-static struct drm_prop_enum_list drm_dpms_enum_list[] =
+static const struct drm_prop_enum_list drm_dpms_enum_list[] =
 {	{ DRM_MODE_DPMS_ON, "On" },
 	{ DRM_MODE_DPMS_STANDBY, "Standby" },
 	{ DRM_MODE_DPMS_SUSPEND, "Suspend" },
@@ -116,7 +117,7 @@
 /*
  * Optional properties
  */
-static struct drm_prop_enum_list drm_scaling_mode_enum_list[] =
+static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] =
 {
 	{ DRM_MODE_SCALE_NONE, "None" },
 	{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
@@ -124,7 +125,7 @@
 	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
 };
 
-static struct drm_prop_enum_list drm_dithering_mode_enum_list[] =
+static const struct drm_prop_enum_list drm_dithering_mode_enum_list[] =
 {
 	{ DRM_MODE_DITHERING_OFF, "Off" },
 	{ DRM_MODE_DITHERING_ON, "On" },
@@ -134,7 +135,7 @@
 /*
  * Non-global properties, but "required" for certain connectors.
  */
-static struct drm_prop_enum_list drm_dvi_i_select_enum_list[] =
+static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] =
 {
 	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
 	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
@@ -143,7 +144,7 @@
 
 DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
 
-static struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] =
+static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] =
 {
 	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
 	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
@@ -153,7 +154,7 @@
 DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
 		 drm_dvi_i_subconnector_enum_list)
 
-static struct drm_prop_enum_list drm_tv_select_enum_list[] =
+static const struct drm_prop_enum_list drm_tv_select_enum_list[] =
 {
 	{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
 	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
@@ -164,7 +165,7 @@
 
 DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
 
-static struct drm_prop_enum_list drm_tv_subconnector_enum_list[] =
+static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] =
 {
 	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
 	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
@@ -176,7 +177,7 @@
 DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
 		 drm_tv_subconnector_enum_list)
 
-static struct drm_prop_enum_list drm_dirty_info_enum_list[] = {
+static const struct drm_prop_enum_list drm_dirty_info_enum_list[] = {
 	{ DRM_MODE_DIRTY_OFF,      "Off"      },
 	{ DRM_MODE_DIRTY_ON,       "On"       },
 	{ DRM_MODE_DIRTY_ANNOTATE, "Annotate" },
@@ -184,7 +185,7 @@
 
 struct drm_conn_prop_enum_list {
 	int type;
-	char *name;
+	const char *name;
 	int count;
 };
 
@@ -210,7 +211,7 @@
 	{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual", 0},
 };
 
-static struct drm_prop_enum_list drm_encoder_enum_list[] =
+static const struct drm_prop_enum_list drm_encoder_enum_list[] =
 {	{ DRM_MODE_ENCODER_NONE, "None" },
 	{ DRM_MODE_ENCODER_DAC, "DAC" },
 	{ DRM_MODE_ENCODER_TMDS, "TMDS" },
@@ -219,7 +220,7 @@
 	{ DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
 };
 
-char *drm_get_encoder_name(struct drm_encoder *encoder)
+const char *drm_get_encoder_name(const struct drm_encoder *encoder)
 {
 	static char buf[32];
 
@@ -230,7 +231,7 @@
 }
 EXPORT_SYMBOL(drm_get_encoder_name);
 
-char *drm_get_connector_name(struct drm_connector *connector)
+const char *drm_get_connector_name(const struct drm_connector *connector)
 {
 	static char buf[32];
 
@@ -241,7 +242,7 @@
 }
 EXPORT_SYMBOL(drm_get_connector_name);
 
-char *drm_get_connector_status_name(enum drm_connector_status status)
+const char *drm_get_connector_status_name(enum drm_connector_status status)
 {
 	if (status == connector_status_connected)
 		return "connected";
@@ -252,6 +253,28 @@
 }
 EXPORT_SYMBOL(drm_get_connector_status_name);
 
+static char printable_char(int c)
+{
+	return isascii(c) && isprint(c) ? c : '?';
+}
+
+const char *drm_get_format_name(uint32_t format)
+{
+	static char buf[32];
+
+	snprintf(buf, sizeof(buf),
+		 "%c%c%c%c %s-endian (0x%08x)",
+		 printable_char(format & 0xff),
+		 printable_char((format >> 8) & 0xff),
+		 printable_char((format >> 16) & 0xff),
+		 printable_char((format >> 24) & 0x7f),
+		 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
+		 format);
+
+	return buf;
+}
+EXPORT_SYMBOL(drm_get_format_name);
+
 /**
  * drm_mode_object_get - allocate a new modeset identifier
  * @dev: DRM device
@@ -1834,7 +1857,8 @@
 		if (fb->pixel_format == plane->format_types[i])
 			break;
 	if (i == plane->format_count) {
-		DRM_DEBUG_KMS("Invalid pixel format 0x%08x\n", fb->pixel_format);
+		DRM_DEBUG_KMS("Invalid pixel format %s\n",
+			      drm_get_format_name(fb->pixel_format));
 		ret = -EINVAL;
 		goto out;
 	}
@@ -2312,7 +2336,8 @@
 
 	ret = format_check(r);
 	if (ret) {
-		DRM_DEBUG_KMS("bad framebuffer format 0x%08x\n", r->pixel_format);
+		DRM_DEBUG_KMS("bad framebuffer format %s\n",
+			      drm_get_format_name(r->pixel_format));
 		return ret;
 	}
 
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index dcde352..58ac677 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -64,6 +64,29 @@
 };
 static int drm_prime_add_buf_handle(struct drm_prime_file_private *prime_fpriv, struct dma_buf *dma_buf, uint32_t handle);
 
+static int drm_gem_map_attach(struct dma_buf *dma_buf,
+			      struct device *target_dev,
+			      struct dma_buf_attachment *attach)
+{
+	struct drm_gem_object *obj = dma_buf->priv;
+	struct drm_device *dev = obj->dev;
+
+	if (!dev->driver->gem_prime_pin)
+		return 0;
+
+	return dev->driver->gem_prime_pin(obj);
+}
+
+static void drm_gem_map_detach(struct dma_buf *dma_buf,
+			       struct dma_buf_attachment *attach)
+{
+	struct drm_gem_object *obj = dma_buf->priv;
+	struct drm_device *dev = obj->dev;
+
+	if (dev->driver->gem_prime_unpin)
+		dev->driver->gem_prime_unpin(obj);
+}
+
 static struct sg_table *drm_gem_map_dma_buf(struct dma_buf_attachment *attach,
 		enum dma_data_direction dir)
 {
@@ -146,6 +169,8 @@
 }
 
 static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
+	.attach = drm_gem_map_attach,
+	.detach = drm_gem_map_detach,
 	.map_dma_buf = drm_gem_map_dma_buf,
 	.unmap_dma_buf = drm_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
@@ -185,13 +210,8 @@
 struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
 				     struct drm_gem_object *obj, int flags)
 {
-	if (dev->driver->gem_prime_pin) {
-		int ret = dev->driver->gem_prime_pin(obj);
-		if (ret)
-			return ERR_PTR(ret);
-	}
 	return dma_buf_export(obj, &drm_gem_prime_dmabuf_ops, obj->size,
-			      0600);
+			     0600);
 }
 EXPORT_SYMBOL(drm_gem_prime_export);
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e81eb20..a4c9f56 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8945,7 +8945,8 @@
 	case DRM_FORMAT_XRGB1555:
 	case DRM_FORMAT_ARGB1555:
 		if (INTEL_INFO(dev)->gen > 3) {
-			DRM_DEBUG("invalid format: 0x%08x\n", mode_cmd->pixel_format);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+				  drm_get_format_name(mode_cmd->pixel_format));
 			return -EINVAL;
 		}
 		break;
@@ -8956,7 +8957,8 @@
 	case DRM_FORMAT_XBGR2101010:
 	case DRM_FORMAT_ABGR2101010:
 		if (INTEL_INFO(dev)->gen < 4) {
-			DRM_DEBUG("invalid format: 0x%08x\n", mode_cmd->pixel_format);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+				  drm_get_format_name(mode_cmd->pixel_format));
 			return -EINVAL;
 		}
 		break;
@@ -8965,12 +8967,14 @@
 	case DRM_FORMAT_YVYU:
 	case DRM_FORMAT_VYUY:
 		if (INTEL_INFO(dev)->gen < 5) {
-			DRM_DEBUG("invalid format: 0x%08x\n", mode_cmd->pixel_format);
+			DRM_DEBUG("unsupported pixel format: %s\n",
+				  drm_get_format_name(mode_cmd->pixel_format));
 			return -EINVAL;
 		}
 		break;
 	default:
-		DRM_DEBUG("unsupported pixel format 0x%08x\n", mode_cmd->pixel_format);
+		DRM_DEBUG("unsupported pixel format: %s\n",
+			  drm_get_format_name(mode_cmd->pixel_format));
 		return -EINVAL;
 	}
 
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 79fb4c7..82670ac 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -930,6 +930,7 @@
 				struct dma_buf *dma_buf);
 	/* low-level interface used by drm_gem_prime_{import,export} */
 	int (*gem_prime_pin)(struct drm_gem_object *obj);
+	void (*gem_prime_unpin)(struct drm_gem_object *obj);
 	struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
 	struct drm_gem_object *(*gem_prime_import_sg_table)(
 				struct drm_device *dev, size_t size,
@@ -1598,7 +1599,6 @@
 extern int drm_sysfs_device_add(struct drm_minor *minor);
 extern void drm_sysfs_hotplug_event(struct drm_device *dev);
 extern void drm_sysfs_device_remove(struct drm_minor *minor);
-extern char *drm_get_connector_status_name(enum drm_connector_status status);
 extern int drm_sysfs_connector_add(struct drm_connector *connector);
 extern void drm_sysfs_connector_remove(struct drm_connector *connector);
 
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index adb3f9b..53c33e2 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -897,12 +897,13 @@
 
 extern void drm_encoder_cleanup(struct drm_encoder *encoder);
 
-extern char *drm_get_connector_name(struct drm_connector *connector);
-extern char *drm_get_dpms_name(int val);
-extern char *drm_get_dvi_i_subconnector_name(int val);
-extern char *drm_get_dvi_i_select_name(int val);
-extern char *drm_get_tv_subconnector_name(int val);
-extern char *drm_get_tv_select_name(int val);
+extern const char *drm_get_connector_name(const struct drm_connector *connector);
+extern const char *drm_get_connector_status_name(enum drm_connector_status status);
+extern const char *drm_get_dpms_name(int val);
+extern const char *drm_get_dvi_i_subconnector_name(int val);
+extern const char *drm_get_dvi_i_select_name(int val);
+extern const char *drm_get_tv_subconnector_name(int val);
+extern const char *drm_get_tv_select_name(int val);
 extern void drm_fb_release(struct drm_file *file_priv);
 extern int drm_mode_group_init_legacy_group(struct drm_device *dev, struct drm_mode_group *group);
 extern bool drm_probe_ddc(struct i2c_adapter *adapter);
@@ -994,7 +995,7 @@
 extern int drm_mode_create_scaling_mode_property(struct drm_device *dev);
 extern int drm_mode_create_dithering_property(struct drm_device *dev);
 extern int drm_mode_create_dirty_info_property(struct drm_device *dev);
-extern char *drm_get_encoder_name(struct drm_encoder *encoder);
+extern const char *drm_get_encoder_name(const struct drm_encoder *encoder);
 
 extern int drm_mode_connector_attach_encoder(struct drm_connector *connector,
 					     struct drm_encoder *encoder);
@@ -1094,5 +1095,6 @@
 extern int drm_format_plane_cpp(uint32_t format, int plane);
 extern int drm_format_horz_chroma_subsampling(uint32_t format);
 extern int drm_format_vert_chroma_subsampling(uint32_t format);
+extern const char *drm_get_format_name(uint32_t format);
 
 #endif /* __DRM_CRTC_H__ */