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-rw-r--r--drivers/gpu/drm/i915/i915_reg.h1
-rw-r--r--drivers/gpu/drm/i915/intel_display.c2
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 27e0e93..8936d40 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3141,6 +3141,7 @@
#define FDI_LINK_TRAIN_NONE_IVB (3<<8)
/* both Tx and Rx */
+#define FDI_COMPOSITE_SYNC (1<<11)
#define FDI_LINK_TRAIN_AUTO (1<<10)
#define FDI_SCRAMBLING_ENABLE (0<<7)
#define FDI_SCRAMBLING_DISABLE (1<<7)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d08a600..853bddb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2340,6 +2340,7 @@ static void ivb_manual_fdi_link_train(struct drm_crtc *crtc)
temp |= FDI_LINK_TRAIN_PATTERN_1_IVB;
temp &= ~FDI_LINK_TRAIN_VOL_EMP_MASK;
temp |= FDI_LINK_TRAIN_400MV_0DB_SNB_B;
+ temp |= FDI_COMPOSITE_SYNC;
I915_WRITE(reg, temp | FDI_TX_ENABLE);
reg = FDI_RX_CTL(pipe);
@@ -2347,6 +2348,7 @@ static void ivb_manual_fdi_link_train(struct drm_crtc *crtc)
temp &= ~FDI_LINK_TRAIN_AUTO;
temp &= ~FDI_LINK_TRAIN_PATTERN_MASK_CPT;
temp |= FDI_LINK_TRAIN_PATTERN_1_CPT;
+ temp |= FDI_COMPOSITE_SYNC;
I915_WRITE(reg, temp | FDI_RX_ENABLE);
POSTING_READ(reg);