drm/vc4: Use drm_fb_cma_fbdev_init/fini()

Use drm_fb_cma_fbdev_init() and drm_fb_cma_fbdev_fini() which relies on
the fact that drm_device holds a pointer to the drm_fb_helper structure.
This means that the driver doesn't have to keep track of that.
Also use the drm_fb_helper functions directly.

Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115142001.45358-18-noralf@tronnes.org

drivers/gpu/drm/vc4/vc4_drv.c

@@ -111,13 +111,6 @@ static int vc4_get_param_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
-static void vc4_lastclose(struct drm_device *dev)
-{
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-
-	drm_fbdev_cma_restore_mode(vc4->fbdev);
-}
-
 static const struct vm_operations_struct vc4_vm_ops = {
 	.fault = vc4_fault,
 	.open = drm_gem_vm_open,
@@ -159,7 +152,7 @@ static struct drm_driver vc4_drm_driver = {
 			    DRIVER_HAVE_IRQ |
 			    DRIVER_RENDER |
 			    DRIVER_PRIME),
-	.lastclose = vc4_lastclose,
+	.lastclose = drm_fb_helper_lastclose,
 	.irq_handler = vc4_irq,
 	.irq_preinstall = vc4_irq_preinstall,
 	.irq_postinstall = vc4_irq_postinstall,
@@ -301,12 +294,10 @@ static void vc4_drm_unbind(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct drm_device *drm = platform_get_drvdata(pdev);
-	struct vc4_dev *vc4 = to_vc4_dev(drm);
 
 	drm_dev_unregister(drm);
 
-	if (vc4->fbdev)
-		drm_fbdev_cma_fini(vc4->fbdev);
+	drm_fb_cma_fbdev_fini(drm);
 
 	drm_mode_config_cleanup(drm);
 

drivers/gpu/drm/vc4/vc4_drv.h

@@ -39,8 +39,6 @@ struct vc4_dev {
 	struct vc4_dsi *dsi1;
 	struct vc4_vec *vec;
 
-	struct drm_fbdev_cma *fbdev;
-
 	struct vc4_hang_state *hang_state;
 
 	/* The kernel-space BO cache.  Tracks buffers that have been

drivers/gpu/drm/vc4/vc4_kms.c

@@ -19,17 +19,11 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include "vc4_drv.h"
 
-static void vc4_output_poll_changed(struct drm_device *dev)
-{
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-
-	drm_fbdev_cma_hotplug_event(vc4->fbdev);
-}
-
 static void
 vc4_atomic_complete_commit(struct drm_atomic_state *state)
 {
@@ -194,7 +188,7 @@ static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev,
 }
 
 static const struct drm_mode_config_funcs vc4_mode_funcs = {
-	.output_poll_changed = vc4_output_poll_changed,
+	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = vc4_atomic_commit,
 	.fb_create = vc4_fb_create,
@@ -224,12 +218,8 @@ int vc4_kms_load(struct drm_device *dev)
 
 	drm_mode_config_reset(dev);
 
-	if (dev->mode_config.num_connector) {
-		vc4->fbdev = drm_fbdev_cma_init(dev, 32,
-						dev->mode_config.num_connector);
-		if (IS_ERR(vc4->fbdev))
-			vc4->fbdev = NULL;
-	}
+	if (dev->mode_config.num_connector)
+		drm_fb_cma_fbdev_init(dev, 32, 0);
 
 	drm_kms_helper_poll_init(dev);