drm/i915: don't save/restore LBB on Gen5+

Because this PCI config register doesn't exist on Gen5+.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 70db618..3538370 100644 (file)
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -340,7 +340,9 @@ int i915_save_state(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        int i;
 
-       pci_read_config_byte(dev->pdev, LBB, &dev_priv->regfile.saveLBB);
+       if (INTEL_INFO(dev)->gen <= 4)
+               pci_read_config_byte(dev->pdev, LBB,
+                                    &dev_priv->regfile.saveLBB);
 
        mutex_lock(&dev->struct_mutex);
 
@@ -390,7 +392,9 @@ int i915_restore_state(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        int i;
 
-       pci_write_config_byte(dev->pdev, LBB, dev_priv->regfile.saveLBB);
+       if (INTEL_INFO(dev)->gen <= 4)
+               pci_write_config_byte(dev->pdev, LBB,
+                                     dev_priv->regfile.saveLBB);
 
        mutex_lock(&dev->struct_mutex);