drm/i915/lvds: Remove busy wait for powering up the panel.

We just assume that it will happen in a timely manner. A variant of this
patch was first written and tested by Arjan van de Van.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index f533169e5d8b636cf129a5325afb37a03f71a3f6..9089604011f9217b5627187435f951945a5fc0f0 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -84,17 +84,13 @@ static void intel_lvds_set_power(struct drm_device *dev, bool on)
        if (on) {
                I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
                I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
-               if (wait_for(I915_READ(status_reg) & PP_ON, 1000))
-                       DRM_ERROR("timed out waiting to enable LVDS pipe");
-
                intel_panel_set_backlight(dev, dev_priv->backlight_level);
        } else {
                intel_panel_set_backlight(dev, 0);
-
                I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
                I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
-               POSTING_READ(lvds_reg);
        }
+       POSTING_READ(lvds_reg);
 }
 
 static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)