drm/radeon: restore the fbdev mode in lastclose

restore the fbdev state if a drm app like X is killed.

Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_fb.c b/drivers/gpu/drm/radeon/radeon_fb.c
index 1aa657fe31cb..26da2f4d7b4f 100644
--- a/drivers/gpu/drm/radeon/radeon_fb.c
+++ b/drivers/gpu/drm/radeon/radeon_fb.c
@@ -397,3 +397,19 @@ void radeon_fb_remove_connector(struct radeon_device *rdev, struct drm_connector
 {
 	drm_fb_helper_remove_one_connector(&rdev->mode_info.rfbdev->helper, connector);
 }
+
+void radeon_fbdev_restore_mode(struct radeon_device *rdev)
+{
+	struct radeon_fbdev *rfbdev = rdev->mode_info.rfbdev;
+	struct drm_fb_helper *fb_helper;
+	int ret;
+
+	if (!rfbdev)
+		return;
+
+	fb_helper = &rfbdev->helper;
+
+	ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
+	if (ret)
+		DRM_DEBUG("failed to restore crtc mode\n");
+}