1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/gpu/drm/clients/drm_client_setup.c b/drivers/gpu/drm/clients/drm_client_setup.c
new file mode 100644
index 000000000000..e17265039ca8
--- /dev/null
+++ b/drivers/gpu/drm/clients/drm_client_setup.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: MIT
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_device.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_print.h>
+
+#include "drm_client_internal.h"
+
+static char drm_client_default[16] = CONFIG_DRM_CLIENT_DEFAULT;
+module_param_string(active, drm_client_default, sizeof(drm_client_default), 0444);
+MODULE_PARM_DESC(active,
+		 "Choose which drm client to start, default is"
+		 CONFIG_DRM_CLIENT_DEFAULT "]");
+
+/**
+ * drm_client_setup() - Setup in-kernel DRM clients
+ * @dev: DRM device
+ * @format: Preferred pixel format for the device. Use NULL, unless
+ *          there is clearly a driver-preferred format.
+ *
+ * This function sets up the in-kernel DRM clients. Restore, hotplug
+ * events and teardown are all taken care of.
+ *
+ * Drivers should call drm_client_setup() after registering the new
+ * DRM device with drm_dev_register(). This function is safe to call
+ * even when there are no connectors present. Setup will be retried
+ * on the next hotplug event.
+ *
+ * The clients are destroyed by drm_dev_unregister().
+ */
+void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format)
+{
+
+#ifdef CONFIG_DRM_FBDEV_EMULATION
+	if (!strcmp(drm_client_default, "fbdev")) {
+		int ret;
+
+		ret = drm_fbdev_client_setup(dev, format);
+		if (ret)
+			drm_warn(dev, "Failed to set up DRM client; error %d\n", ret);
+		return;
+	}
+#endif
+
+#ifdef CONFIG_DRM_CLIENT_LOG
+	if (!strcmp(drm_client_default, "log")) {
+		drm_log_register(dev);
+		return;
+	}
+#endif
+	if (strcmp(drm_client_default, ""))
+		drm_warn(dev, "Unknown DRM client %s\n", drm_client_default);
+}
+EXPORT_SYMBOL(drm_client_setup);
+
+/**
+ * drm_client_setup_with_fourcc() - Setup in-kernel DRM clients for color mode
+ * @dev: DRM device
+ * @fourcc: Preferred pixel format as 4CC code for the device
+ *
+ * This function sets up the in-kernel DRM clients. It is equivalent
+ * to drm_client_setup(), but expects a 4CC code as second argument.
+ */
+void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc)
+{
+	drm_client_setup(dev, drm_format_info(fourcc));
+}
+EXPORT_SYMBOL(drm_client_setup_with_fourcc);
+
+/**
+ * drm_client_setup_with_color_mode() - Setup in-kernel DRM clients for color mode
+ * @dev: DRM device
+ * @color_mode: Preferred color mode for the device
+ *
+ * This function sets up the in-kernel DRM clients. It is equivalent
+ * to drm_client_setup(), but expects a color mode as second argument.
+ *
+ * Do not use this function in new drivers. Prefer drm_client_setup() with a
+ * format of NULL.
+ */
+void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode)
+{
+	u32 fourcc = drm_driver_color_mode_format(dev, color_mode);
+
+	drm_client_setup_with_fourcc(dev, fourcc);
+}
+EXPORT_SYMBOL(drm_client_setup_with_color_mode);
+
+MODULE_DESCRIPTION("In-kernel DRM clients");
+MODULE_LICENSE("GPL and additional rights");