[Bug 81826] [BDW Bisected] eDP monitor can't be lighted up after S3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81826

--- Comment #3 from liulei <lei.a.liu at intel.com> ---
(In reply to comment #2)
> Created attachment 104324 [details] [review]
> upda psr on resume
> 
> Could you please check if the attached patch fix the issue.
> 
I can't patch your attachment. It will be such wonderful if you can rebase your
patch on latest -next-queued. This piece patch failed:
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3972,6 +3972,11 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
     I915_WRITE(DSPCNTR(plane), DISPPLANE_GAMMA_ENABLE);
     POSTING_READ(DSPCNTR(plane));

+    /* Forcing a full psr init sequence when enabling crtc to make sure all
+    * registers are properly set. Some might not be persistent after
+    * suspend/resume cycle. */
+    dev_priv->psr.setup_done = false;
+
     dev_priv->display.update_primary_plane(crtc, crtc->primary->fb,
                            crtc->x, crtc->y);
I can't find its context.

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