drm/i915/dp: make eDP PLL functions work as advertised

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index ada7319f0eaf63343a60711b66d72deca5dc4230..128c2fefd541ab5fb255873751e5b5fdcf46ecf2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -891,8 +891,10 @@ static void ironlake_edp_pll_on(struct drm_encoder *encoder)
 
        DRM_DEBUG_KMS("\n");
        dpa_ctl = I915_READ(DP_A);
-       dpa_ctl &= ~DP_PLL_ENABLE;
+       dpa_ctl |= DP_PLL_ENABLE;
        I915_WRITE(DP_A, dpa_ctl);
+       POSTING_READ(DP_A);
+       udelay(200);
 }
 
 static void ironlake_edp_pll_off(struct drm_encoder *encoder)
@@ -902,7 +904,7 @@ static void ironlake_edp_pll_off(struct drm_encoder *encoder)
        u32 dpa_ctl;
 
        dpa_ctl = I915_READ(DP_A);
-       dpa_ctl |= DP_PLL_ENABLE;
+       dpa_ctl &= ~DP_PLL_ENABLE;
        I915_WRITE(DP_A, dpa_ctl);
        POSTING_READ(DP_A);
        udelay(200);