From c21d27bafc38fc9573b4ca6b8ae4eaea0237026d Mon Sep 17 00:00:00 2001
From: Mark Yao <mark.yao@rock-chips.com>
Date: Fri, 5 May 2017 15:24:43 +0800
Subject: [PATCH] drm: add drm_device_get_by_name support

Change-Id: Ifbd0f403ca2302e9329a16d7b69db5ee056cadf7
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---
 drivers/gpu/drm/drm_drv.c | 22 ++++++++++++++++++++++
 include/drm/drmP.h        |  8 ++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 54625bcd42e9..63bd9decd4c2 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -417,6 +417,28 @@ void drm_minor_release(struct drm_minor *minor)
 	drm_dev_unref(minor->dev);
 }
 
+struct drm_device *drm_device_get_by_name(const char *name)
+{
+	int i;
+
+	for (i = 0; i < 64; i++) {
+		struct drm_minor *minor;
+
+		minor = drm_minor_acquire(i + DRM_MINOR_CONTROL);
+		if (IS_ERR(minor))
+			continue;
+		if (!minor->dev || !minor->dev->driver ||
+		    !minor->dev->driver->name)
+			continue;
+		if (!name)
+			return minor->dev;
+		if (!strcmp(name, minor->dev->driver->name))
+			return minor->dev;
+	}
+
+	return NULL;
+}
+
 /**
  * DOC: driver instance overview
  *
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 24ddc4b798b0..418d5fcd598e 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1127,6 +1127,14 @@ int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...);
 
 struct drm_minor *drm_minor_acquire(unsigned int minor_id);
 void drm_minor_release(struct drm_minor *minor);
+#ifdef CONFIG_DRM
+struct drm_device *drm_device_get_by_name(const char *name);
+#else
+static inline struct drm_device *drm_device_get_by_name(const char *name)
+{
+	return NULL;
+}
+#endif
 
 /*@}*/
 
-- 
2.34.1