drm/vc4: Use the fbdev_cma helpers

Keep the fbdev_cma pointer around so we can use it on hotplog and close
to ensure the frame buffer console is in a useful state.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>

3 files changed, 32 insertions, 3 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 5c023ba4f6ad..04f1f738ebc2 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
+#include <drm/drm_fb_cma_helper.h>
 
 #include "uapi/drm/vc4_drm.h"
 #include "vc4_drv.h"
@@ -78,6 +79,11 @@ vc4_drm_load(struct drm_device *dev, unsigned long flags)
 
 static int vc4_drm_unload(struct drm_device *dev)
 {
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->fbdev)
+		drm_fbdev_cma_fini(vc4->fbdev);
+
 	drm_mode_config_cleanup(dev);
 
 	component_unbind_all(dev->dev, dev);
@@ -93,6 +99,14 @@ static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file)
 		vc4_cancel_page_flip(crtc, file);
 }
 
+static void vc4_lastclose(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->fbdev)
+		drm_fbdev_cma_restore_mode(vc4->fbdev);
+}
+
 static const struct file_operations vc4_drm_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
@@ -123,6 +137,7 @@ static struct drm_driver vc4_drm_driver = {
 			    DRIVER_PRIME),
 	.load = vc4_drm_load,
 	.unload = vc4_drm_unload,
+	.lastclose = vc4_lastclose,
 	.set_busid = drm_platform_set_busid,
 	.preclose = vc4_drm_preclose,
 
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 13b475785ca0..d460bb3e6b64 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -81,6 +81,8 @@ struct vc4_dev {
 	} hangcheck;
 
 	struct semaphore async_modeset;
+
+	struct drm_fbdev_cma *fbdev;
 };
 
 static inline struct vc4_dev *
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index acfd1b23ab4a..cb18d8f0e387 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -155,7 +155,17 @@ static int vc4_atomic_commit(struct drm_device *dev,
 	return 0;
 }
 
+static void vc4_output_poll_changed(struct drm_device *dev)
+{
+	struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+	if (vc4->fbdev)
+		drm_fbdev_cma_hotplug_event(vc4->fbdev);
+}
+
+
 static const struct drm_mode_config_funcs vc4_mode_funcs = {
+	.output_poll_changed = vc4_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = vc4_atomic_commit,
 	.fb_create = drm_fb_cma_create,
@@ -214,9 +224,11 @@ vc4_kms_load(struct drm_device *dev)
 
 	drm_mode_config_reset(dev);
 
-	drm_fbdev_cma_init(dev, 32,
-			   dev->mode_config.num_crtc,
-			   dev->mode_config.num_connector);
+	vc4->fbdev = drm_fbdev_cma_init(dev, 32,
+					dev->mode_config.num_crtc,
+					dev->mode_config.num_connector);
+	if (IS_ERR(vc4->fbdev))
+		vc4->fbdev = NULL;
 
 	drm_kms_helper_poll_init(dev);