drm/i915: set phase sync pointer override enable before setting phase sync pointer
We need to unlock the phase sync pointer enable bit before we can
actually enable the phase sync pointer workaround on Ironlake.
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_display.c b/drivers/gpu/drm/i915/intel_display.c
index aee2aba..2842dbe 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2273,7 +2273,11 @@
udelay(150);
/* Ironlake workaround, enable clock pointer after FDI enable*/
- I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_ENABLE);
+ if (HAS_PCH_IBX(dev)) {
+ I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);
+ I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR |
+ FDI_RX_PHASE_SYNC_POINTER_EN);
+ }
reg = FDI_RX_IIR(pipe);
for (tries = 0; tries < 5; tries++) {
@@ -2516,10 +2520,12 @@
udelay(100);
/* Ironlake workaround, disable clock pointer after downing FDI */
- if (HAS_PCH_IBX(dev))
+ if (HAS_PCH_IBX(dev)) {
+ I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_OVR);
I915_WRITE(FDI_RX_CHICKEN(pipe),
I915_READ(FDI_RX_CHICKEN(pipe) &
- ~FDI_RX_PHASE_SYNC_POINTER_ENABLE));
+ ~FDI_RX_PHASE_SYNC_POINTER_EN));
+ }
/* still set train pattern 1 */
reg = FDI_TX_CTL(pipe);