drm/i915: Add DP training pattern 3 for CHV

CHV supports DP training pattern 3. Add the required stuff.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e01a1a0..e355fc8 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3489,6 +3489,8 @@ enum punit_power_well {
 #define   DP_LINK_TRAIN_OFF            (3 << 28)
 #define   DP_LINK_TRAIN_MASK           (3 << 28)
 #define   DP_LINK_TRAIN_SHIFT          28
+#define   DP_LINK_TRAIN_PAT_3_CHV      (1 << 14)
+#define   DP_LINK_TRAIN_MASK_CHV       ((3 << 28)|(1<<14))
 
 /* CPT Link training mode */
 #define   DP_LINK_TRAIN_PAT_1_CPT      (0 << 8)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 3ea5cef..0aa219d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2959,7 +2959,10 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
                }
 
        } else {
-               *DP &= ~DP_LINK_TRAIN_MASK;
+               if (IS_CHERRYVIEW(dev))
+                       *DP &= ~DP_LINK_TRAIN_MASK_CHV;
+               else
+                       *DP &= ~DP_LINK_TRAIN_MASK;
 
                switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
                case DP_TRAINING_PATTERN_DISABLE:
@@ -2972,8 +2975,12 @@ intel_dp_set_link_train(struct intel_dp *intel_dp,
                        *DP |= DP_LINK_TRAIN_PAT_2;
                        break;
                case DP_TRAINING_PATTERN_3:
-                       DRM_ERROR("DP training pattern 3 not supported\n");
-                       *DP |= DP_LINK_TRAIN_PAT_2;
+                       if (IS_CHERRYVIEW(dev)) {
+                               *DP |= DP_LINK_TRAIN_PAT_3_CHV;
+                       } else {
+                               DRM_ERROR("DP training pattern 3 not supported\n");
+                               *DP |= DP_LINK_TRAIN_PAT_2;
+                       }
                        break;
                }
        }
@@ -3260,7 +3267,10 @@ intel_dp_link_down(struct intel_dp *intel_dp)
                DP &= ~DP_LINK_TRAIN_MASK_CPT;
                I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT);
        } else {
-               DP &= ~DP_LINK_TRAIN_MASK;
+               if (IS_CHERRYVIEW(dev))
+                       DP &= ~DP_LINK_TRAIN_MASK_CHV;
+               else
+                       DP &= ~DP_LINK_TRAIN_MASK;
                I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
        }
        POSTING_READ(intel_dp->output_reg);