drm/radeon: handle runtime pm in fbcon (v2)

Ported from nouveau.

v2: re-enable runtime autosuspend in the error case
Acked-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_fb.c

@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
+#include <linux/pm_runtime.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
@@ -47,8 +48,35 @@ struct radeon_fbdev {
 	struct radeon_device *rdev;
 };
 
+static int
+radeonfb_open(struct fb_info *info, int user)
+{
+	struct radeon_fbdev *rfbdev = info->par;
+	struct radeon_device *rdev = rfbdev->rdev;
+	int ret = pm_runtime_get_sync(rdev->ddev->dev);
+	if (ret < 0 && ret != -EACCES) {
+		pm_runtime_mark_last_busy(rdev->ddev->dev);
+		pm_runtime_put_autosuspend(rdev->ddev->dev);
+		return ret;
+	}
+	return 0;
+}
+
+static int
+radeonfb_release(struct fb_info *info, int user)
+{
+	struct radeon_fbdev *rfbdev = info->par;
+	struct radeon_device *rdev = rfbdev->rdev;
+
+	pm_runtime_mark_last_busy(rdev->ddev->dev);
+	pm_runtime_put_autosuspend(rdev->ddev->dev);
+	return 0;
+}
+
 static struct fb_ops radeonfb_ops = {
 	.owner = THIS_MODULE,
+	.fb_open = radeonfb_open,
+	.fb_release = radeonfb_release,
 	.fb_check_var = drm_fb_helper_check_var,
 	.fb_set_par = drm_fb_helper_set_par,
 	.fb_fillrect = drm_fb_helper_cfb_fillrect,