drm/i915: Program iboost settings for HDMI/DVI on SKL

Currently we fail to program the iboost stuff for HDMI/DVI. Let's remedy
that.

Cc: stable@vger.kernel.org
Fixes: f8896f5d58e6 ("drm/i915/skl: Buffer translation improvements")
Cc: David Weinehall <david.weinehall@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1468328376-6380-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
(cherry picked from commit 8d8bb85eb7d859aa9bbe36e588690a1d22af7608)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 40 insertions, 11 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 75354cd9bbab..415c061e2969 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -388,6 +388,40 @@ skl_get_buf_trans_hdmi(struct drm_i915_private *dev_priv, int *n_entries)
         }
 }
 
+static int intel_ddi_hdmi_level(struct drm_i915_private *dev_priv, enum port port)
+{
+        int n_hdmi_entries;
+        int hdmi_level;
+        int hdmi_default_entry;
+
+        hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
+
+        if (IS_BROXTON(dev_priv))
+                return hdmi_level;
+
+        if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
+                skl_get_buf_trans_hdmi(dev_priv, &n_hdmi_entries);
+                hdmi_default_entry = 8;
+        } else if (IS_BROADWELL(dev_priv)) {
+                n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
+                hdmi_default_entry = 7;
+        } else if (IS_HASWELL(dev_priv)) {
+                n_hdmi_entries = ARRAY_SIZE(hsw_ddi_translations_hdmi);
+                hdmi_default_entry = 6;
+        } else {
+                WARN(1, "ddi translation table missing\n");
+                n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
+                hdmi_default_entry = 7;
+        }
+
+        /* Choose a good default if VBT is badly populated */
+        if (hdmi_level == HDMI_LEVEL_SHIFT_UNKNOWN ||
+            hdmi_level >= n_hdmi_entries)
+                hdmi_level = hdmi_default_entry;
+
+        return hdmi_level;
+}
+
 /*
  * Starting with Haswell, DDI port buffers must be programmed with correct
  * values in advance. The buffer values are different for FDI and DP modes,
@@ -399,7 +433,7 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
 {
         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
         u32 iboost_bit = 0;
-        int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry,
+        int i, n_hdmi_entries, n_dp_entries, n_edp_entries,
             size;
         int hdmi_level;
         enum port port;
@@ -410,7 +444,7 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
         const struct ddi_buf_trans *ddi_translations;
 
         port = intel_ddi_get_encoder_port(encoder);
-        hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
+        hdmi_level = intel_ddi_hdmi_level(dev_priv, port);
 
         if (IS_BROXTON(dev_priv)) {
                 if (encoder->type != INTEL_OUTPUT_HDMI)
@@ -430,7 +464,6 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
                                 skl_get_buf_trans_edp(dev_priv, &n_edp_entries);
                 ddi_translations_hdmi =
                                 skl_get_buf_trans_hdmi(dev_priv, &n_hdmi_entries);
-                hdmi_default_entry = 8;
                 /* If we're boosting the current, set bit 31 of trans1 */
                 if (dev_priv->vbt.ddi_port_info[port].hdmi_boost_level ||
                     dev_priv->vbt.ddi_port_info[port].dp_boost_level)
@@ -456,7 +489,6 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
 
                 n_dp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
                 n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
-                hdmi_default_entry = 7;
         } else if (IS_HASWELL(dev_priv)) {
                 ddi_translations_fdi = hsw_ddi_translations_fdi;
                 ddi_translations_dp = hsw_ddi_translations_dp;
@@ -464,7 +496,6 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
                 ddi_translations_hdmi = hsw_ddi_translations_hdmi;
                 n_dp_entries = n_edp_entries = ARRAY_SIZE(hsw_ddi_translations_dp);
                 n_hdmi_entries = ARRAY_SIZE(hsw_ddi_translations_hdmi);
-                hdmi_default_entry = 6;
         } else {
                 WARN(1, "ddi translation table missing\n");
                 ddi_translations_edp = bdw_ddi_translations_dp;
@@ -474,7 +505,6 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
                 n_edp_entries = ARRAY_SIZE(bdw_ddi_translations_edp);
                 n_dp_entries = ARRAY_SIZE(bdw_ddi_translations_dp);
                 n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
-                hdmi_default_entry = 7;
         }
 
         switch (encoder->type) {
@@ -505,11 +535,6 @@ void intel_prepare_ddi_buffer(struct intel_encoder *encoder)
         if (encoder->type != INTEL_OUTPUT_HDMI)
                 return;
 
-        /* Choose a good default if VBT is badly populated */
-        if (hdmi_level == HDMI_LEVEL_SHIFT_UNKNOWN ||
-            hdmi_level >= n_hdmi_entries)
-                hdmi_level = hdmi_default_entry;
-
         /* Entry 9 is for HDMI: */
         I915_WRITE(DDI_BUF_TRANS_LO(port, i),
                    ddi_translations_hdmi[hdmi_level].trans1 | iboost_bit);
@@ -1647,6 +1672,10 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
                         intel_dp_stop_link_train(intel_dp);
         } else if (type == INTEL_OUTPUT_HDMI) {
                 struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
+                int level = intel_ddi_hdmi_level(dev_priv, port);
+
+                if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv))
+                        skl_ddi_set_iboost(intel_encoder, level);
 
                 intel_hdmi->set_infoframes(encoder,
                                            crtc->config->has_hdmi_sink,