Revert "drm/i915: allow PCH PWM override on IVB"

This reverts commit f82cfb6bcda164ef3a66b8c3fc549b1f9bdd09ad.

This breaks the backlight controls on my IVB asus zenbook with an eDP
panel.

I guess the right fix would be to read this bit and use either the pch
or the cpu register to frob the backlight values. But that is stuff
for -next.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a7c727d0c1050d1669bd602d40ab3a517b52f8b2..a8538ac0299dac4252394b1fc28d9c3f58e173cc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6921,19 +6921,6 @@ static void i915_disable_vga(struct drm_device *dev)
        POSTING_READ(vga_reg);
 }
 
-static void ivb_pch_pwm_override(struct drm_device *dev)
-{
-       struct drm_i915_private *dev_priv = dev->dev_private;
-
-       /*
-        * IVB has CPU eDP backlight regs too, set things up to let the
-        * PCH regs control the backlight
-        */
-       I915_WRITE(BLC_PWM_CPU_CTL2, PWM_ENABLE);
-       I915_WRITE(BLC_PWM_CPU_CTL, 0);
-       I915_WRITE(BLC_PWM_PCH_CTL1, PWM_ENABLE | (1<<30));
-}
-
 void intel_modeset_init_hw(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
@@ -6950,9 +6937,6 @@ void intel_modeset_init_hw(struct drm_device *dev)
                gen6_enable_rps(dev_priv);
                gen6_update_ring_freq(dev_priv);
        }
-
-       if (IS_IVYBRIDGE(dev))
-               ivb_pch_pwm_override(dev);
 }
 
 void intel_modeset_init(struct drm_device *dev)