drm/i915: force restore on lid open

There seem to be indeed some awkwards machines around, mostly those
without OpRegion support, where the firmware changes the display hw
state behind our backs when closing the lid.

This force-restore logic has been originally introduced in

commit c1c7af60892070e4b82ad63bbfb95ae745056de0
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Thu Sep 10 15:28:03 2009 -0700

    drm/i915: force mode set at lid open time

but after the modeset-rework we've disabled it in the vain hope that
it's no longer required:

commit 3b7a89fce3e3dc96b549d6d829387b4439044d0d
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon Sep 17 22:27:21 2012 +0200

    drm/i915: fix OOPS in lid_notify

Alas, no.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54677
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57434
Tested-by: Krzysztof Mazur <krzysiek@podlesie.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

4 files changed, 16 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 6745c7f976db..a12921892446 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -564,7 +564,7 @@ static int __i915_drm_thaw(struct drm_device *dev)
                 mutex_unlock(&dev->struct_mutex);
 
                 intel_modeset_init_hw(dev);
-                intel_modeset_setup_hw_state(dev);
+                intel_modeset_setup_hw_state(dev, false);
                 drm_irq_install(dev);
         }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 87c06f97fa89..47c62f5125a7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1652,7 +1652,8 @@ extern void intel_modeset_init(struct drm_device *dev);
 extern void intel_modeset_gem_init(struct drm_device *dev);
 extern void intel_modeset_cleanup(struct drm_device *dev);
 extern int intel_modeset_vga_set_state(struct drm_device *dev, bool state);
-extern void intel_modeset_setup_hw_state(struct drm_device *dev);
+extern void intel_modeset_setup_hw_state(struct drm_device *dev,
+                                         bool force_restore);
 extern bool intel_fbc_enabled(struct drm_device *dev);
 extern void intel_disable_fbc(struct drm_device *dev);
 extern bool ironlake_set_drps(struct drm_device *dev, u8 val);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3f7f62d370cb..78d12c471472 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8988,7 +8988,8 @@ static void intel_sanitize_encoder(struct intel_encoder *encoder)
 
 /* Scan out the current hw modeset state, sanitizes it and maps it into the drm
  * and i915 state tracking structures. */
-void intel_modeset_setup_hw_state(struct drm_device *dev)
+void intel_modeset_setup_hw_state(struct drm_device *dev,
+                                  bool force_restore)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
         enum pipe pipe;
@@ -9087,7 +9088,15 @@ void intel_modeset_setup_hw_state(struct drm_device *dev)
                 intel_sanitize_crtc(crtc);
         }
 
-        intel_modeset_update_staged_output_state(dev);
+        if (force_restore) {
+                for_each_pipe(pipe) {
+                        crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
+                        intel_set_mode(&crtc->base, &crtc->base.mode,
+                                       crtc->base.x, crtc->base.y, crtc->base.fb);
+                }
+        } else {
+                intel_modeset_update_staged_output_state(dev);
+        }
 
         intel_modeset_check_state(dev);
 
@@ -9100,7 +9109,7 @@ void intel_modeset_gem_init(struct drm_device *dev)
 
         intel_setup_overlay(dev);
 
-        intel_modeset_setup_hw_state(dev);
+        intel_modeset_setup_hw_state(dev, false);
 }
 
 void intel_modeset_cleanup(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 81502e8be26b..b9a660a53677 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -532,7 +532,7 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
         dev_priv->modeset_on_lid = 0;
 
         mutex_lock(&dev->mode_config.mutex);
-        intel_modeset_check_state(dev);
+        intel_modeset_setup_hw_state(dev, true);
         mutex_unlock(&dev->mode_config.mutex);
 
         return NOTIFY_OK;