Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

[linux.git] / drivers / gpu / drm / radeon / radeon_pm.c

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 460c8f2989daca1ba9af3b7ba59d724c27182c1c..248c5a9fb0b6faa19467f130428c0c9e7cb3223f 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -276,8 +276,12 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev)
        if (rdev->irq.installed) {
                for (i = 0; i < rdev->num_crtc; i++) {
                        if (rdev->pm.active_crtcs & (1 << i)) {
-                               rdev->pm.req_vblank |= (1 << i);
-                               drm_vblank_get(rdev->ddev, i);
+                               /* This can fail if a modeset is in progress */
+                               if (drm_vblank_get(rdev->ddev, i) == 0)
+                                       rdev->pm.req_vblank |= (1 << i);
+                               else
+                                       DRM_DEBUG_DRIVER("crtc %d no vblank, can glitch\n",
+                                                        i);
                        }
                }
        }