My machine here has the correct ones already, but better safe
than sorry. IBX has different settings for that register, and
on IBX the device defaults match the recommended values. Hence
I did not add the respective writes for IBX.
LPT needs the same settings, but that has been done already
commit 4acf518626cdad5bbf7aac9869bd4accbbfb4ad3
Author: Eugeni Dodonov <eugeni.dodonov at intel.com>
Date: Wed Jul 4 20:15:16 2012 -0300
drm/i915: program FDI_RX TP and FDI delays
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/intel_display.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6cc9cb9..b19e3bb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2460,6 +2460,9 @@ static void gen6_fdi_link_train(struct drm_crtc *crtc)
temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
I915_WRITE(reg, temp | FDI_TX_ENABLE);
+ I915_WRITE(FDI_RX_MISC(pipe),
+ FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);
+
reg = FDI_RX_CTL(pipe);
temp = I915_READ(reg);
if (HAS_PCH_CPT(dev)) {
@@ -2592,6 +2595,9 @@ static void ivb_manual_fdi_link_train(struct drm_crtc *crtc)
temp |= FDI_COMPOSITE_SYNC;
I915_WRITE(reg, temp | FDI_TX_ENABLE);
+ I915_WRITE(FDI_RX_MISC(pipe),
+ FDI_RX_TP1_TO_TP2_48 | FDI_RX_FDI_DELAY_90);
+
reg = FDI_RX_CTL(pipe);
temp = I915_READ(reg);
temp &= ~FDI_LINK_TRAIN_AUTO;
--
1.7.11.4
