From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri, 27 Apr 2012 13:17:46 +0000 (+0200)
Subject: drm/i915: remove modeset reset from i915_reset
X-Git-Tag: v3.5-rc1~83^2~8^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=523bcb28c3fb92baecda6daa60560f67eb4a6177;p=profile%2Fivi%2Fkernel-x86-ivi.git

drm/i915: remove modeset reset from i915_reset

On gen4+ we don't reset the display unit, so resetting the complete
modeset state should not be necessary.

We can't do reset on gen3 anyway, which leaves us with gen2 reset:
According to Chris Wilson, that doesn't work so great, so he suggested
we just ignore that. If the need ever arrises, we can re-add it later
on.

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 45c9430..133f101 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -904,21 +904,11 @@ int i915_reset(struct drm_device *dev)
 			intel_modeset_init_hw(dev);
 
 		drm_irq_uninstall(dev);
-		drm_mode_config_reset(dev);
 		drm_irq_install(dev);
 	} else {
 		mutex_unlock(&dev->struct_mutex);
 	}
 
-	/*
-	 * Perform a full modeset as on later generations, e.g. Ironlake, we may
-	 * need to retrain the display link and cannot just restore the register
-	 * values.
-	 */
-	mutex_lock(&dev->mode_config.mutex);
-	drm_helper_resume_force_mode(dev);
-	mutex_unlock(&dev->mode_config.mutex);
-
 	return 0;
 }