drm/i915: Introduce intel_ddi_dp_level.

No functional changes. This only moves the DP level
selection to a separated function that will be later
used to organize better the vswing sequences.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170829232230.23051-1-rodrigo.vivi@intel.com

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 0a316a6..7e875e0 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -2054,18 +2054,22 @@ static uint32_t translate_signal_level(int signal_levels)
        return 0;
 }
 
+static uint32_t intel_ddi_dp_level(struct intel_dp *intel_dp)
+{
+       uint8_t train_set = intel_dp->train_set[0];
+       int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
+                                        DP_TRAIN_PRE_EMPHASIS_MASK);
+
+       return translate_signal_level(signal_levels);
+}
+
 uint32_t ddi_signal_levels(struct intel_dp *intel_dp)
 {
        struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
        struct drm_i915_private *dev_priv = to_i915(dport->base.base.dev);
        struct intel_encoder *encoder = &dport->base;
-       uint8_t train_set = intel_dp->train_set[0];
-       int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
-                                        DP_TRAIN_PRE_EMPHASIS_MASK);
        enum port port = dport->port;
-       uint32_t level;
-
-       level = translate_signal_level(signal_levels);
+       uint32_t level = intel_ddi_dp_level(intel_dp);
 
        if (IS_GEN9_BC(dev_priv))
                skl_ddi_set_iboost(encoder, level);