The self-refresh helper framework overloads "disable" to sometimes mean
"go into self-refresh mode," and this mode activates automatically
(e.g., after some period of unchanging display output). In such cases,
the display pipe is still considered "on", and user-space is not aware
that we went into self-refresh mode. Thus, users may expect that
vblank-related features (such as DRM_IOCTL_WAIT_VBLANK) still work
properly.

However, we trigger the WARN_ONCE() here if a CRTC driver tries to leave
vblank enabled.

Add a different expectation: that CRTCs *should* leave vblank enabled
when going into self-refresh.

This patch is preparation for another patch -- "drm/rockchip: vop: Leave
vblank enabled in self-refresh" -- which resolves conflicts between the
above self-refresh behavior and the API tests in IGT's kms_vblank test
module.

v2:
 * add 'ret != 0' warning case for self-refresh
 * describe failing test case and relation to drm/rockchip patch better

Cc: <sta...@vger.kernel.org> # dependency for "drm/rockchip: vop: Leave
                             # vblank enabled in self-refresh"
Signed-off-by: Brian Norris <briannor...@chromium.org>
---
 drivers/gpu/drm/drm_atomic_helper.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c 
b/drivers/gpu/drm/drm_atomic_helper.c
index d579fd8f7cb8..a22485e3e924 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1209,7 +1209,16 @@ disable_outputs(struct drm_device *dev, struct 
drm_atomic_state *old_state)
                        continue;
 
                ret = drm_crtc_vblank_get(crtc);
-               WARN_ONCE(ret != -EINVAL, "driver forgot to call 
drm_crtc_vblank_off()\n");
+               /*
+                * Self-refresh is not a true "disable"; ensure vblank remains
+                * enabled.
+                */
+               if (new_crtc_state->self_refresh_active)
+                       WARN_ONCE(ret != 0,
+                                 "driver disabled vblank in self-refresh\n");
+               else
+                       WARN_ONCE(ret != -EINVAL,
+                                 "driver forgot to call 
drm_crtc_vblank_off()\n");
                if (ret == 0)
                        drm_crtc_vblank_put(crtc);
        }
-- 
2.39.0.314.g84b9a713c41-goog

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