drm/exynos: added ipp device registration to drm driver

This patch added exynos-drm-ipp platform device registration to the exynos drm
driver. When DT is enabled, platform devices need to be registered within the
driver code. This patch fits the requirement of both DT and Non DT based drm
drivers.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Donghwa Lee <dh09.lee@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -380,6 +380,10 @@ static int __init exynos_drm_init(void)
 	ret = platform_driver_register(&ipp_driver);
 	if (ret < 0)
 		goto out_ipp;
+
+	ret = exynos_platform_device_ipp_register();
+	if (ret < 0)
+		goto out_ipp_dev;
 #endif
 
 	ret = platform_driver_register(&exynos_drm_platform_driver);
@@ -400,6 +404,8 @@ out:
 
 out_drm:
 #ifdef CONFIG_DRM_EXYNOS_IPP
+	exynos_platform_device_ipp_unregister();
+out_ipp_dev:
 	platform_driver_unregister(&ipp_driver);
 out_ipp:
 #endif
@@ -456,6 +462,7 @@ static void __exit exynos_drm_exit(void)
 	platform_driver_unregister(&exynos_drm_platform_driver);
 
 #ifdef CONFIG_DRM_EXYNOS_IPP
+	exynos_platform_device_ipp_unregister();
 	platform_driver_unregister(&ipp_driver);
 #endif
 

drivers/gpu/drm/exynos/exynos_drm_drv.h

@@ -329,6 +329,16 @@ int exynos_platform_device_hdmi_register(void);
  */
 void exynos_platform_device_hdmi_unregister(void);
 
+/*
+ * this function registers exynos drm ipp platform device.
+ */
+int exynos_platform_device_ipp_register(void);
+
+/*
+ * this function unregisters exynos drm ipp platform device if it exists.
+ */
+void exynos_platform_device_ipp_unregister(void);
+
 extern struct platform_driver fimd_driver;
 extern struct platform_driver hdmi_driver;
 extern struct platform_driver mixer_driver;

drivers/gpu/drm/exynos/exynos_drm_ipp.c

@@ -47,6 +47,9 @@
 #define get_ipp_context(dev)	platform_get_drvdata(to_platform_device(dev))
 #define ipp_is_m2m_cmd(c)	(c == IPP_CMD_M2M)
 
+/* platform device pointer for ipp device. */
+static struct platform_device *exynos_drm_ipp_pdev;
+
 /*
  * A structure of event.
  *
@@ -102,6 +105,30 @@ static LIST_HEAD(exynos_drm_ippdrv_list);
 static DEFINE_MUTEX(exynos_drm_ippdrv_lock);
 static BLOCKING_NOTIFIER_HEAD(exynos_drm_ippnb_list);
 
+int exynos_platform_device_ipp_register(void)
+{
+	struct platform_device *pdev;
+
+	if (exynos_drm_ipp_pdev)
+		return -EEXIST;
+
+	pdev = platform_device_register_simple("exynos-drm-ipp", -1, NULL, 0);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	exynos_drm_ipp_pdev = pdev;
+
+	return 0;
+}
+
+void exynos_platform_device_ipp_unregister(void)
+{
+	if (exynos_drm_ipp_pdev) {
+		platform_device_unregister(exynos_drm_ipp_pdev);
+		exynos_drm_ipp_pdev = NULL;
+	}
+}
+
 int exynos_drm_ippdrv_register(struct exynos_drm_ippdrv *ippdrv)
 {
 	DRM_DEBUG_KMS("%s\n", __func__);