1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 222459ad178d..14e516fdc2dd 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -89,17 +89,22 @@ static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
 static void intel_lvds_set_power(struct drm_device *dev, bool on)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
-        u32 pp_status, ctl_reg, status_reg;
+        u32 pp_status, ctl_reg, status_reg, lvds_reg;
 
         if (HAS_PCH_SPLIT(dev)) {
                 ctl_reg = PCH_PP_CONTROL;
                 status_reg = PCH_PP_STATUS;
+                lvds_reg = PCH_LVDS;
         } else {
                 ctl_reg = PP_CONTROL;
                 status_reg = PP_STATUS;
+                lvds_reg = LVDS;
         }
 
         if (on) {
+                I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
+                POSTING_READ(lvds_reg);
+
                 I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
                            POWER_TARGET_ON);
                 do {
@@ -115,6 +120,9 @@ static void intel_lvds_set_power(struct drm_device *dev, bool on)
                 do {
                         pp_status = I915_READ(status_reg);
                 } while (pp_status & PP_ON);
+
+                I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
+                POSTING_READ(lvds_reg);
         }
 }