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SubjectRe: [drm/nouveau] GeForce 8600 GT boot/suspend grumbling
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On Sat, 2017-07-15 at 14:52 -0400, Ilia Mirkin wrote:
>
> OK, so this issue appears to be that we're calling
> drm_crtc_vblank_off() on a crtc for which vblank is already disabled.
> My guess is that this happens because the crtc is disabled.
>
> Not sure what the proper check is to see if vblanks are already disabled...

Seems so, the below shut up suspend for both 8600 GT and GTX 980.

---
drivers/gpu/drm/drm_vblank.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -323,6 +323,14 @@ void drm_vblank_disable_and_save(struct
spin_lock_irqsave(&dev->vblank_time_lock, irqflags);

/*
+ * Always update the count and timestamp to maintain the
+ * appearance that the counter has been ticking all along until
+ * this time. This makes the count account for the entire time
+ * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
+ */
+ drm_update_vblank_count(dev, pipe, false);
+
+ /*
* Only disable vblank interrupts if they're enabled. This avoids
* calling the ->disable_vblank() operation in atomic context with the
* hardware potentially runtime suspended.
@@ -332,14 +340,6 @@ void drm_vblank_disable_and_save(struct
vblank->enabled = false;
}

- /*
- * Always update the count and timestamp to maintain the
- * appearance that the counter has been ticking all along until
- * this time. This makes the count account for the entire time
- * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
- */
- drm_update_vblank_count(dev, pipe, false);
-
spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
}

@@ -605,7 +605,7 @@ bool drm_calc_vbltimestamp_from_scanoutp
*/
if (mode->crtc_clock == 0) {
DRM_DEBUG("crtc %u: Noop due to uninitialized mode.\n", pipe);
- WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev));
+ WARN_ON_ONCE(drm_drv_uses_atomic_modeset(dev) && vblank->enabled);

return false;
}
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